• S5PV210裸机(五):定时器

            本文主要探讨210定时器相关知识，210定时器主要包含PWN定时器，系统定时器，看门狗，RTC。

    PWM定时器
            210有5个PWM定时器,timer0、1、2、3通过对应PIO产生PWM波形信号并输出,timer4没有GPIO只产生内部定时器中断
            PWM定时器时钟源为PCLK_PSYS,timer0、1共用prescaler0预分频器（8位）,timer2、3、4使用prescaler1预分频器（8位）,且每个timer有分频器预分频器和分频器构成分频系统,将PCLK_PSYS分频后的时钟给timer作为时钟周期
            预分频器分频值范围为1～256,分频器是MUX开关（1/1,1/2,1/4,1/8,1/16）
    在PCLK_PSYS（66MHz）下,产生时钟周期范围为0.03us--62.061us,计数器TCNTB值范围为1--2^32,最大时间范围为266548.27s（74h+）

    PWN配置寄存器TCFG0、TCFG1、TCON、TCNT、TCNTB、TCNTO、TCMPB

            TCFG0用于配置预分频器和死区 

             TCFG1用于配置分频器

            TCON用于配置自动重加载，手动刷入数据，时钟开关 

            TCNTB是地址寄存器（可写）用于存储计数值便于在自动模式下刷入

            TCNT（不可读写）用于周期递减（-1）将计数值写入TCNTB中,启动timer前需要将TCNTB中的值刷到TCNT中（手写寄存器输入一次）


    TCNTO（只读）用于读取目前TCNT的值


    PWM波形参数：周期T,占空比duty（高电平时间占比）,TCMPB决定PWM波形占空比

    电平翻转器
            电平翻转器是电平取反电路
            定义TCNT>TCMPB时为高电平,反之为低电平
            当占空比为30%翻转后变为70%(高低电平互换)

    死区生成器
            PWM应对交流电压进行整流。整流时2路整流分别在正电平和负电平时导通工作,不能同时导通（短路）
            实际电路不可能同时上升或下降沿,保留留死区避免短路
            死区少容易短路,死区多控制精度低产品性能低
            210自带的死区生成器

    蜂鸣器
            蜂鸣器的2金属片通电吸附撞击产生声音,通过导通频率控制吸附频率控制声音(PWM驱动)
            蜂鸣器通过GPD0_2（XpwmTOUT2）引脚连接在SoC
            GPD0CON(0xE02000A0),bit8～bit11设置为0b0010（TOUT_2是PWM输出）

    看门狗定时器
            定时监测cpu防止跑飞，规定周期时间计数内若没有恢复计数，默认系统跑飞则会复位cpu
    看门狗配置寄存器WTCON、WTDAT、WTCNT、WTCLRINT

            WTCON用于配置时钟源启停，时钟分频，中断启停，复位启停

             WTDAT配置第一次使用时间周期（上电到第一次触发的时间）   

             WTCNT配置时间周期的计数值               WTCLRINT写任意值清除中断  

    实时时钟RTC
            RTC是内部外设,有独立晶振提供RTC时钟源（32.768KHz）,内部的寄存器用来记录时间（年月日时分秒星期），系统关机时时间仍在计时(独立电源供电)

    闹钟发生器定点时间产生RTC中断

    RTC寄存器


    INTP 中断挂起寄存器


    RTCCON RTC控制寄存器


    RTCALM    ALMxxx  闹钟功能有关的寄存器

    BCDxxx           时间寄存器

    BCD码
            27<==转换==>0x27
            RTC中所有的时间（年月日时分秒星期,闹钟）用BCD码编码

    注意：RTC读写是禁止,读写前打开RTC,读写后关闭，读写RTC寄存器时,一定要注意BCD码和十进制之间的转换，BCDYEAR若2023写入（2023-2000）

    demo1:

            PWN定时器操作蜂鸣器

            start.S

    1. #define WTCON           0xE2700000
    2. #define SVC_STACK       0xd0037d80
    3.  
    4. .global _start
    5. .global IRQ_handler
    6.  
    7. _start:
    8.         //close watchDog
    9.         ldr r0,=WTCON
    10.         ldr r1,=0x0
    11.         str r1,[r0]
    12.  
    13.         //init SVC stack
    14.         ldr sp,=SVC_STACK
    15.  
    16.         //init icache
    17.         mrc p15,0,r0,c1,c0,0
    18.         bic r0,r0,#(1<<12)      //close icache
    19.         orr r0,r0,#(1<<12)      //open icache
    20.         mcr p15,0,r0,c1,c0,0
    21.  
    22.         //use func
    23.         bl main

    main.c 

    1. #include "pwn_buzzer.h"
    2.  
    3. static void dealy_time()
    4. {
    5.         volatile unsigned int i = 900000;
    6.         while(i--);
    7. }
    8.  
    9. int main()
    10. {
    11.         pwn_buzzer_timer_init();
    12.  
    13.         while(1)
    14.         {
    15.                 dealy_time();
    16.         }
    17.  
    18.         return 0;
    19. }

     pwn_buzzer.h

    void pwn_buzzer_timer_init();

     pwn_buzzer.c

    1. #define GPD0CON         0xE02000A0
    2.  
    3. #define TCFG0           0xE2500000
    4. #define TCFG1           0xE2500004
    5. #define TCON            0xE2500008
    6. #define TCNTB2          0xE2500024
    7. #define TCMPB2          0xE2500028
    8.  
    9. #define rGPD0CON        (*(volatile unsigned int *) GPD0CON)
    10. #define rTCFG0          (*(volatile unsigned int *) TCFG0)
    11. #define rTCFG1          (*(volatile unsigned int *) TCFG1)
    12. #define rTCON           (*(volatile unsigned int *) TCON)
    13. #define rTCNTB0         (*(volatile unsigned int *) TCNTB2)
    14. #define rTCMPB2         (*(volatile unsigned int *) TCMPB2)
    15.  
    16. void pwn_buzzer_timer_init()
    17. {
    18.         //set gpio as buzzer
    19.         rGPD0CON &= ~(0x0f << 8);
    20.         rGPD0CON |= (2 << 8);
    21.  
    22.         //set Prescaler as 65,real Prescaleris 66,Prescaler is 66Mhz /66 = 1Mhz
    23.         rTCFG0 &= ~(0xff<<8);
    24.         rTCFG0 = (65<<8);
    25.  
    26.         //set div ,set div is 2 that mean 1/2,so 1Mhz /2 = 500000hz = 2us
    27.         rTCFG1 &= ~(0x0f<<8);
    28.         rTCFG1 = (1<<8);
    29.  
    30.         //set TCON,set  Auto Reload open
    31.         rTCON = (1<<15);
    32.  
    33.         //set TCNTB0,set the count of cycle
    34.         //rTCNTB0 = time you need / set div 
    35.         //ex: 1ms / 2us = 500
    36.         rTCNTB0 = 500;
    37.  
    38.         //set TCMPB2,set the rate of duty,mean the rate of high and low level on all cycle 
    39.         rTCMPB2 = 250;
    40.  
    41.         //set TCON,when firstly open timer that you Manual Refresh TCNTB0 to TCNT
    42.         rTCON |= (1<<13);
    43.         //after Manual Refresh,close Manual Refresh,then always Auto Reload
    44.         rTCON &= ~(1<<13);
    45.  
    46.         //set TCON,open timer 
    47.         rTCON |= (1<<12);
    48. }

    Makefile 

    1. CC      =       arm-linux-gcc
    2. LD      =       arm-linux-ld
    3. OBJCOPY =       arm-linux-objcopy
    4. OBJDUMP =       arm-linux-objdump
    5.  
    6. #预处理器的flag，flag就是编译器可选的选项
    7. CPPFLAGS  := -nostdlib -nostdinc
    8. #C编译器的flag
    9. CFLAGS    := -Wall -O2 -fno-builtin
    10.  
    11. export CC LD OBJCOPY OBJDUMP CPPFLAGS CFLAGS
    12.  
    13. objs      := start.o main.o pwn_buzzer.o
    14.  
    15. led.bin:$(objs)
    16.          $(LD) -Ttext 0x0  -o buzzer.elf $^
    17.          $(OBJCOPY) -O binary buzzer.elf buzzer.bin
    18.          $(OBJDUMP) -D buzzer.elf > buzzer.dis
    19.          gcc mkv210.c -o mkv210
    20.          ./mkv210 buzzer.bin sd.bin
    21.  
    22. %.o:%.S
    23.          $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    24.  
    25. %.o:%.c
    26.          $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    27.  
    28. clean:
    29.          rm *.o *.elf *.bin *.dis mkv210 -f

    demo2:

            看门狗中断

    start.S

    1. #define WTCON           0xE2700000
    2. #define SVC_STACK       0xd0037d80
    3. #define IRQ_STACK       0xd0037f80
    4.  
    5. .global _start
    6. .global IRQ_handler
    7.  
    8. _start:
    9.         //close watchDog
    10.         ldr r0,=WTCON
    11.         ldr r1,=0x0
    12.         str r1,[r0]
    13.  
    14.         //init SVC stack
    15.         ldr sp,=SVC_STACK
    16.  
    17.         //init icache
    18.         mrc p15,0,r0,c1,c0,0
    19.         bic r0,r0,#(1<<12)      //close icache
    20.         orr r0,r0,#(1<<12)      //open icache
    21.         mcr p15,0,r0,c1,c0,0
    22.  
    23.         //use func
    24.         bl main
    25.  
    26.         b .
    27.  
    28. //all interrupt process:Protect the scene + mian iqr process + return scene
    29. IRQ_handler:
    30.         //init IRQ_STACK
    31.         ldr sp, =IRQ_STACK
    32.         //protect lr
    33.         sub lr, lr, #4
    34.         //protect r0--r12 that in irq stack
    35.         stmfd sp!, {r0-r12, lr}
    36.         //mian iqr process
    37.         bl irq_handler
    38.         //return scene
    39.         ldmfd sp!, {r0-r12, pc}^

    main.c 

    1. #include "uart_printf.h"
    2. #include "wdt_interrupt.h"
    3. #include "stdio.h"
    4.  
    5. static void dealy_time()
    6. {
    7.         volatile unsigned int i = 1000000;
    8.         while(i--);
    9. }
    10.  
    11. int main()
    12. {
    13.         //init uart
    14.         init_uart();
    15.         printf("init uart over\n");
    16.  
    17.         //init outer interupt
    18.         printf("init wdt\n");
    19.         wdt_interrupt();
    20.  
    21.         //init inner interupt
    22.         printf("init inner\n");
    23.         init_inner_interrupt();
    24.  
    25.         //dealy time
    26.         while(1)
    27.         {
    28.                 printf("..");
    29.                 dealy_time();
    30.         }
    31.  
    32.         return 0;
    33. }

            uart_printf.h 

    void init_uart();

          uart_printf.c

    1. #define GPA0CON         0xE0200000
    2.  
    3. #define ULCON0          0xE2900000
    4. #define UCON0           0xE2900004
    5. #define UFCON0          0xE2900008
    6. #define UMCON0          0xE290000C
    7. #define UTRSTAT0        0xE2900010
    8. #define UTXH0           0xE2900020
    9. #define URXH0           0xE2900024
    10. #define UBRDIV0         0xE2900028
    11. #define UDIVSLOT0       0xE290002C
    12.  
    13. #define rGPA0CON        (*(volatile unsigned int *)GPA0CON)
    14. #define rULCON0         (*(volatile unsigned int *)ULCON0)
    15. #define rUCON0          (*(volatile unsigned int *)UCON0)
    16. #define rUFCON0         (*(volatile unsigned int *)UFCON0)
    17. #define rUMCON0         (*(volatile unsigned int *)UMCON0)
    18. #define rUTRSTAT0       (*(volatile unsigned int *)UTRSTAT0)
    19. #define rUTXH0          (*(volatile unsigned int *)UTXH0)
    20. #define rURXH0          (*(volatile unsigned int *)URXH0)
    21. #define rUBRDIV0        (*(volatile unsigned int *)UBRDIV0)
    22. #define rUDIVSLOT0      (*(volatile unsigned int *)UDIVSLOT0)
    23.  
    24. //init uart
    25. void init_uart()
    26. {
    27.         //set gpio as uart(rx,tx)
    28.         rGPA0CON &= ~(0xff);
    29.         rGPA0CON |= ((1<<2)|(1<<5));
    30.  
    31.         //set uart base configure(mode)
    32.         rULCON0 = 0x3;
    33.         rUCON0 = 0x5;
    34.         rUMCON0 = 0;
    35.         rUFCON0 = 0;
    36.  
    37.         //set uart baud
    38.         //DIV_VAL = (PCLK / (bps x 16))-1
    39.         //(66000000 /(115200 * 16)) -1 = 34.8
    40.         rUBRDIV0 = 34;
    41.  
    42.         //set uart baud calibration
    43.         //0.8 * 16 = 13,check 210 table
    44.         rUDIVSLOT0 = 0xdfdd;
    45. }
    46.  
    47.  
    48. //send data
    49. void putc(char data)
    50. {                  
    51.         while (!(rUTRSTAT0 & (1<<1)));
    52.         rUTXH0 = data;
    53. }
    54.  
    55. //receive data
    56. char getc()
    57. {
    58.         while (!(rUTRSTAT0 & (1<<0)));
    59.         return (rURXH0 & 0xff);
    60. }

            wdt_interrupt.h 

    1. void wdt_interrupt();
    2.  
    3. void init_inner_interrupt()

            wdt_interrupt.c

       

    1. #include "stdio.h"
    2.  
    3. //watchDog interrupt register
    4.  
    5. #define WTCON           0xE2700000
    6. #define WTDAT           0xE2700004
    7. #define WTCNT           0xE2700008
    8. #define WTCLRINT         0xE270000C
    9.  
    10. #define rWTCON          *((volatile unsigned int *) WTCON)
    11. #define rWTDAT          *((volatile unsigned int *) WTDAT)
    12. #define rWTCNT          *((volatile unsigned int *) WTCNT)
    13. #define rWTCLRINT         *((volatile unsigned int *) WTCLRINT)
    14.  
    15. //inner interrupt register
    16.  
    17. //VIC base address
    18.  
    19. #define VIC0_BASE       0xF2000000
    20. #define VIC1_BASE       0xF2100000
    21. #define VIC2_BASE       0xF2200000
    22. #define VIC3_BASE       0xF2300000
    23.  
    24. //VIC0 register
    25.  
    26. #define rVIC0IRQSTATUS          (*(volatile unsigned int *)(VIC0_BASE + 0x0000))
    27. #define rVIC0FIQSTATUS          (*(volatile unsigned int *)(VIC0_BASE + 0x0004))
    28. #define rVIC0INTSELECT          (*(volatile unsigned int *)(VIC0_BASE + 0x000C))
    29. #define rVIC0INTENABLE          (*(volatile unsigned int *)(VIC0_BASE + 0x0010))
    30. #define rVIC0INTENCLEAR         (*(volatile unsigned int *)(VIC0_BASE + 0x0014))
    31. #define rVIC0VECTADDR           (VIC0_BASE + 0x100)
    32. #define rVIC0ADDRESS            (*(volatile unsigned int *)(VIC0_BASE + 0x0F00))
    33.  
    34. //VIC1 register
    35.  
    36. #define rVIC1IRQSTATUS          (*(volatile unsigned int *)(VIC1_BASE + 0x0000))
    37. #define rVIC1FIQSTATUS          (*(volatile unsigned int *)(VIC1_BASE + 0x0004))
    38. #define rVIC1INTSELECT          (*(volatile unsigned int *)(VIC1_BASE + 0x000C))
    39. #define rVIC1INTENABLE          (*(volatile unsigned int *)(VIC1_BASE + 0x0010))
    40. #define rVIC1INTENCLEAR         (*(volatile unsigned int *)(VIC1_BASE + 0x0014))
    41. #define rVIC1VECTADDR           (VIC1_BASE + 0x100)
    42. #define rVIC1ADDRESS            (*(volatile unsigned int *)(VIC1_BASE + 0x0F00))
    43.  
    44. //VIC2 register
    45.  
    46. #define rVIC2IRQSTATUS          (*(volatile unsigned int *)(VIC2_BASE + 0x0000))
    47. #define rVIC2FIQSTATUS          (*(volatile unsigned int *)(VIC2_BASE + 0x0004))
    48. #define rVIC2INTSELECT          (*(volatile unsigned int *)(VIC2_BASE + 0x000C))
    49. #define rVIC2INTENABLE          (*(volatile unsigned int *)(VIC2_BASE + 0x0010))
    50. #define rVIC2INTENCLEAR         (*(volatile unsigned int *)(VIC2_BASE + 0x0014))
    51. #define rVIC2VECTADDR           (VIC2_BASE + 0x100)
    52. #define rVIC2ADDRESS            (*(volatile unsigned int *)(VIC2_BASE + 0x0F00))
    53.  
    54. //VIC3 register
    55.  
    56. #define rVIC3IRQSTATUS          (*(volatile unsigned int *)(VIC3_BASE + 0x0000))
    57. #define rVIC3FIQSTATUS          (*(volatile unsigned int *)(VIC3_BASE + 0x0004))
    58. #define rVIC3INTSELECT          (*(volatile unsigned int *)(VIC3_BASE + 0x000C))
    59. #define rVIC3INTENABLE          (*(volatile unsigned int *)(VIC3_BASE + 0x0010))
    60. #define rVIC3INTENCLEAR         (*(volatile unsigned int *)(VIC3_BASE + 0x0014))
    61. #define rVIC3VECTADDR           (VIC3_BASE + 0x100)
    62. #define rVIC3ADDRESS            (*(volatile unsigned int *)(VIC3_BASE + 0x0F00))
    63.  
    64. //interrupt vector table
    65.  
    66. #define vector_table_base       0xD0037400
    67.  
    68. #define reset_vector            (vector_table_base + 0x00)
    69. #define undef_vector            (vector_table_base + 0x04)
    70. #define sotf_interrupt_vector   (vector_table_base + 0x08)
    71. #define prefetch_vector         (vector_table_base + 0x0C)
    72. #define data_vector             (vector_table_base + 0x10)
    73. #define irq_vector              (vector_table_base + 0x18)
    74. #define fiq_vector              (vector_table_base + 0x1C)
    75.  
    76. #define r_reset_vector                  (*(volatile unsigned int *) reset_vector)
    77. #define r_undef_vector                  (*(volatile unsigned int *) undef_vector)
    78. #define r_sotf_interrupt_vector         (*(volatile unsigned int *) sotf_interrupt_vector)
    79. #define r_prefetch_vector               (*(volatile unsigned int *) prefetch_vector)
    80. #define r_data_vector                   (*(volatile unsigned int *) data_vector)
    81. #define r_irq_vector                    (*(volatile unsigned int *) irq_vector)
    82. #define r_fiq_vector                    (*(volatile unsigned int *) fiq_vector)
    83.  
    84. //interrupt number
    85.  
    86. #define NUM_TIMER0                              (21)
    87. #define NUM_TIMER1                              (22)
    88. #define NUM_TIMER2                              (23)
    89. #define NUM_TIMER3                              (24)
    90. #define NUM_TIMER4                              (25)
    91. #define NUM_SYSTIMER                            (26)
    92. #define NUM_WDT                                 (27)
    93. #define NUM_RTC_ALARM                           (28)
    94. #define NUM_RTC_TICK                            (29)
    95.  
    96. //wdt interrupt func
    97.  
    98. void wdt_interrupt()
    99. {
    100.         //set WTCON,set Prescaler,Prescaler is set value + 1
    101.         //Prescaler = 65 + 1 = 66,66Mhz / 66 = 1Mhz = 1000000hz
    102.         rWTCON &= ~(0xff << 8); 
    103.         rWTCON |= (65<<8);
    104.         //set div is 128,t = 1/(1000000hz /128) = 1.28us
    105.         rWTCON &= ~(3 << 3);
    106.         rWTCON |= (3<<3);
    107.  
    108.         //set WTCON,open interrupt and close reset
    109.         rWTCON |= (1<<2);
    110.         rWTCON &= ~(1);
    111.  
    112.         //set WTDAT,set set the time form firstly open timer to count open(WTCNT)
    113.         rWTDAT = 1000;
    114.         rWTCNT = 1000;
    115.  
    116.         //open wdt
    117.         rWTCON |= (1<<5);
    118. }
    119.  
    120. //dealy_time
    121.  
    122. static void dealy_time()
    123. {
    124.         volatile unsigned int i = 1000000;
    125.         while(i--);
    126. }
    127.  
    128.  
    129. //outer interrupt key func
    130. static void isr_wdt()
    131. {
    132.         static int num = 0;
    133.         printf("wdt interrupt,num = %d\n",num++);
    134.         dealy_time();
    135.  
    136.         //clear VIC0ADDR,clear using interrupt process
    137.         rVIC0ADDRESS = 0;
    138.         rVIC1ADDRESS = 0;
    139.         rVIC2ADDRESS = 0;
    140.         rVIC3ADDRESS = 0;
    141.  
    142.         rWTCLRINT = 1;  
    143. }
    144.  
    145. //inner interrupt func
    146.  
    147. static void reset_func()
    148. {
    149.         printf("reset\n");
    150. }
    151.  
    152. static void undef_func()
    153. {
    154.         printf("undef\n");
    155. }
    156.  
    157. static void sotf_interrupt_func()
    158.  
    159. {
    160.         printf("sotf_intrrupt\n");
    161. }
    162.  
    163. static void prefetch_func()
    164. {
    165.         printf("prefetch\n");
    166. }
    167.  
    168. static void data_func()
    169. {
    170.         printf("data\n");
    171. }
    172.  
    173. static void fiq_func()
    174. {
    175.         printf("irq\n");
    176. }
    177.  
    178. void IRQ_handler();
    179.  
    180. static void bind_isr_VICnINTENCLEAR(unsigned long num,void (*handler)())
    181. {
    182.         if(num <32)
    183.         {
    184.                 printf("bind ok\n");
    185.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num))) = (unsigned)handler;
    186.         }
    187.         else if(num < 64)
    188.         {
    189.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num-32))) = (unsigned)handler;
    190.         }
    191.         else if(num < 96)
    192.         {
    193.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num-64))) = (unsigned)handler;
    194.         }
    195.         else
    196.         {
    197.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num-96))) = (unsigned)handler;
    198.         }
    199. }
    200.  
    201. static void enable_interrupt(unsigned long num)
    202. {
    203.         unsigned long tmp;
    204.  
    205.         if(num < 32)
    206.         {
    207.                 tmp = rVIC0INTENABLE;
    208.                 tmp |= (1<<num);
    209.                 rVIC0INTENABLE = tmp;
    210.         }
    211.         else if(num < 64)
    212.         {
    213.                 tmp = rVIC0INTENABLE;
    214.                 tmp |= (1<<(num-32));
    215.                 rVIC1INTENABLE = tmp;
    216.         }
    217.         else if(num < 96)
    218.         {
    219.                 tmp = rVIC0INTENABLE;
    220.                 tmp |= (1<<(num-64));
    221.                 rVIC2INTENABLE = tmp;
    222.         }
    223.         else if(num < 200)
    224.         {
    225.                 tmp = rVIC0INTENABLE;
    226.                 tmp |= (1<<(num-96));
    227.                 rVIC3INTENABLE = tmp;
    228.         }
    229.         else
    230.         {
    231.                 rVIC0INTENABLE = 0xffffffff;
    232.                 rVIC1INTENABLE = 0xffffffff;
    233.                 rVIC2INTENABLE = 0xffffffff;
    234.                 rVIC3INTENABLE = 0xffffffff;
    235.         }
    236. }
    237.  
    238. void init_inner_interrupt()
    239. {
    240.         //bind interrupt process on interrupt vector table 
    241.         r_reset_vector           =      (unsigned int)reset_func; 
    242.         r_undef_vector           =      (unsigned int)undef_func;
    243.         r_sotf_interrupt_vector  =      (unsigned int)sotf_interrupt_func;
    244.         r_prefetch_vector        =      (unsigned int)prefetch_func;
    245.         r_data_vector            =      (unsigned int)data_func;
    246.         r_irq_vector             =      (unsigned int)IRQ_handler;
    247.         r_fiq_vector             =      (unsigned int)fiq_func;
    248.  
    249.         //select interrupt mode(irq)
    250.         rVIC0INTSELECT = 0x0;
    251.         rVIC1INTSELECT = 0x0;
    252.         rVIC2INTSELECT = 0x0;
    253.         rVIC3INTSELECT = 0x0;
    254.  
    255.         //diasble interrupt
    256.         rVIC0INTENCLEAR = 0xffffffff;
    257.         rVIC1INTENCLEAR = 0xffffffff;
    258.         rVIC2INTENCLEAR = 0xffffffff;
    259.         rVIC3INTENCLEAR = 0xffffffff;
    260.  
    261.         //clear interrupt process address 
    262.         rVIC0ADDRESS = 0;
    263.         rVIC1ADDRESS = 0;
    264.         rVIC2ADDRESS = 0;
    265.         rVIC3ADDRESS = 0;
    266.  
    267.         //bind isr process on VICnINTENCLEAR
    268.         bind_isr_VICnINTENCLEAR(NUM_WDT,isr_wdt);
    269.  
    270.         //enable interrupt
    271.         enable_interrupt(NUM_WDT);
    272. }
    273.  
    274. //judge inner interrupt ,get interrupt occure in which VICnVECTADDR
    275. void irq_handler()
    276. {
    277.         volatile unsigned int n = 0;
    278.         void (*isr)(void) = NULL;
    279.         for(n = 0;n <4;n++)
    280.         {
    281.                 if(n == 0 && rVIC0IRQSTATUS != 0)
    282.                 {
    283.                         isr = (void (*)(void))rVIC0ADDRESS; 
    284.                 }
    285.                 else if(n == 1 && rVIC1IRQSTATUS != 0)
    286.                 {
    287.                         isr = (void (*)(void))rVIC1ADDRESS; 
    288.                 }
    289.                 else if(n == 2 && rVIC2IRQSTATUS != 0)
    290.                 {
    291.                         isr = (void (*)(void))rVIC2ADDRESS; 
    292.                 }
    293.                 else if(n == 3 && rVIC3IRQSTATUS != 0)
    294.                 {
    295.                         isr = (void (*)(void))rVIC3ADDRESS; 
    296.                 }
    297.                 (*isr)();
    298.         }
    299. }

            link.lds

    1. SECTIONS
    2. {
    3.         . = 0xd0020010;
    4.  
    5.         .text :
    6.         {
    7.                 start.o
    8.                 *(.text)
    9.         }
    10.  
    11.         .data :
    12.         {
    13.                 *(.data)
    14.         }
    15.  
    16.         .bss :
    17.         {
    18.                 *(.bss)
    19.         }
    20. }

             Makefile

    1. CC      =       arm-linux-gcc
    2. LD      =       arm-linux-ld
    3. OBJCOPY =       arm-linux-objcopy
    4. OBJDUMP =       arm-linux-objdump
    5.  
    6. INCDIR  := $(shell pwd)
    7.  
    8. #预处理器的flag，flag就是编译器可选的选项
    9. CPPFLAGS  := -nostdlib -nostdinc -I$(INCDIR)/include
    10. #C编译器的flag
    11. CFLAGS    := -Wall -O2 -fno-builtin
    12.  
    13. export CC LD OBJCOPY OBJDUMP CPPFLAGS CFLAGS
    14.  
    15. objs      := start.o uart_printf.o main.o wdt_interrupt.o
    16. objs      += lib/libc.a
    17.  
    18. led.bin:$(objs)
    19.         $(LD) -Tlink.lds -o wdt_interrupt.elf $^
    20.         $(OBJCOPY) -O binary wdt_interrupt.elf wdt_interrupt.bin
    21.         $(OBJDUMP) -D wdt_interrupt.elf > wdt_interrupt.dis
    22.         gcc mkv210.c -o mkv210
    23.         ./mkv210 wdt_interrupt.bin sd.bin
    24.  
    25. lib/libc.a:
    26.         cd lib;  make;  cd ..
    27.  
    28. %.o:%.S
    29.         $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    30.  
    31. %.o:%.c
    32.         $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    33.  
    34. clean:
    35.         rm *.o *.elf *.bin *.dis mkv210 -f
    36.         cd lib; make clean; cd ..

            结果示例:  

    demo3:

            看门狗复位

            start.S

    1. #define WTCON           0xE2700000
    2. #define SVC_STACK       0xd0037d80
    3.  
    4. .global _start
    5. .global IRQ_handler
    6.  
    7. _start:
    8.         //close watchDog
    9.         ldr r0,=WTCON
    10.         ldr r1,=0x0
    11.         str r1,[r0]
    12.  
    13.         //init SVC stack
    14.         ldr sp,=SVC_STACK
    15.  
    16.         //init icache
    17.         mrc p15,0,r0,c1,c0,0
    18.         bic r0,r0,#(1<<12)      //close icache
    19.         orr r0,r0,#(1<<12)      //open icache
    20.         mcr p15,0,r0,c1,c0,0
    21.  
    22.         //use func
    23.         bl main
    24.  
    25.         b .

               main.c

    1. #include "uart_printf.h"
    2. #include "wdt_reset.h"
    3. #include "stdio.h"
    4.  
    5. static void dealy_time()
    6. {
    7.         volatile unsigned int i = 1000000;
    8.         while(i--);
    9. }
    10.  
    11. int main()
    12. {
    13.         //init uart
    14.         init_uart();
    15.         printf("init uart over\n");
    16.  
    17.         //init outer interupt
    18.         static int num = 1;
    19.         printf("init wdt,num = %d\n",num++);
    20.         wdt_reset();
    21.  
    22.         //dealy_time 
    23.         while(1)
    24.         {
    25.                 dealy_time();
    26.  
    27.         }
    28.  
    29.         return 0;
    30. }

              uart_printf.h 

    void init_uart();

             uart_printf.c

    1. #define GPA0CON         0xE0200000
    2.  
    3. #define ULCON0          0xE2900000
    4. #define UCON0           0xE2900004
    5. #define UFCON0          0xE2900008
    6. #define UMCON0          0xE290000C
    7. #define UTRSTAT0        0xE2900010
    8. #define UTXH0           0xE2900020
    9. #define URXH0           0xE2900024
    10. #define UBRDIV0         0xE2900028
    11. #define UDIVSLOT0       0xE290002C
    12.  
    13. #define rGPA0CON        (*(volatile unsigned int *)GPA0CON)
    14. #define rULCON0         (*(volatile unsigned int *)ULCON0)
    15. #define rUCON0          (*(volatile unsigned int *)UCON0)
    16. #define rUFCON0         (*(volatile unsigned int *)UFCON0)
    17. #define rUMCON0         (*(volatile unsigned int *)UMCON0)
    18. #define rUTRSTAT0       (*(volatile unsigned int *)UTRSTAT0)
    19. #define rUTXH0          (*(volatile unsigned int *)UTXH0)
    20. #define rURXH0          (*(volatile unsigned int *)URXH0)
    21. #define rUBRDIV0        (*(volatile unsigned int *)UBRDIV0)
    22. #define rUDIVSLOT0      (*(volatile unsigned int *)UDIVSLOT0)
    23.  
    24. //init uart
    25. void init_uart()
    26. {
    27.         //set gpio as uart(rx,tx)
    28.         rGPA0CON &= ~(0xff);
    29.         rGPA0CON |= ((1<<2)|(1<<5));
    30.  
    31.         //set uart base configure(mode)
    32.         rULCON0 = 0x3;
    33.         rUCON0 = 0x5;
    34.         rUMCON0 = 0;
    35.         rUFCON0 = 0;
    36.  
    37.         //set uart baud
    38.         //DIV_VAL = (PCLK / (bps x 16))-1
    39.         //(66000000 /(115200 * 16)) -1 = 34.8
    40.         rUBRDIV0 = 34;
    41.  
    42.         //set uart baud calibration
    43.         //0.8 * 16 = 13,check 210 table
    44.         rUDIVSLOT0 = 0xdfdd;
    45. }
    46.  
    47.  
    48. //send data
    49. void putc(char data)
    50. {                  
    51.         while (!(rUTRSTAT0 & (1<<1)));
    52.         rUTXH0 = data;
    53. }
    54.  
    55. //receive data
    56. char getc()
    57. {
    58.         while (!(rUTRSTAT0 & (1<<0)));
    59.         return (rURXH0 & 0xff);
    60. }

            wdt_reset.h 

    void wdt_reset();

            wdt_reset.c

    1. #define WTCON           0xE2700000
    2. #define WTDAT           0xE2700004
    3. #define WTCNT           0xE2700008
    4. #define WTCLRIN         0xE270000C
    5.  
    6. #define rWTCON          *((volatile unsigned int *) WTCON)
    7. #define rWTDAT          *((volatile unsigned int *) WTDAT)
    8. #define rWTCNT          *((volatile unsigned int *) WTCNT)
    9. #define rWTCLRI         *((volatile unsigned int *) WTCLRI)
    10.  
    11. void wdt_reset()
    12. {
    13.         //set WTCON,set Prescaler,Prescaler is set value + 1
    14.         //Prescaler = 65 + 1 = 66,66Mhz / 66 = 1Mhz = 1000000hz
    15.         rWTCON &= ~(0xff << 8); 
    16.         rWTCON |= (65<<8);
    17.         //set div is 128,t = 1/(1000000hz /128) = 1.28us
    18.         rWTCON &= ~(3 << 3);
    19.         rWTCON |= (3<<8);
    20.  
    21.         //set WTCON,close interrupt and open reset
    22.         rWTCON &= ~(1<<2);
    23.         rWTCON |= 1;
    24.  
    25.         //set WTDAT,set set the time form firstly open timer to count open(WTCNT)
    26.         rWTDAT = 1000;
    27.         rWTCNT = 1000;
    28.  
    29.         //open wdt
    30.         rWTCON |= (1<<5);
    31. }

            link.lds 

    1. SECTIONS
    2. {
    3.         . = 0xd0020010;
    4.  
    5.         .text :
    6.         {
    7.                 start.o
    8.                 *(.text)
    9.         }
    10.  
    11.         .data :
    12.         {
    13.                 *(.data)
    14.         }
    15.  
    16.         .bss :
    17.         {
    18.                 *(.bss)
    19.         }
    20. }

            Makefile 

    1. CC      =       arm-linux-gcc
    2. LD      =       arm-linux-ld
    3. OBJCOPY =       arm-linux-objcopy
    4. OBJDUMP =       arm-linux-objdump
    5.  
    6. INCDIR  := $(shell pwd)
    7.  
    8. #预处理器的flag，flag就是编译器可选的选项
    9. CPPFLAGS  := -nostdlib -nostdinc -I$(INCDIR)/include
    10. #C编译器的flag
    11. CFLAGS    := -Wall -O2 -fno-builtin
    12.  
    13. export CC LD OBJCOPY OBJDUMP CPPFLAGS CFLAGS
    14.  
    15. objs      := start.o uart_printf.o main.o wdt_reset.o
    16. objs      += lib/libc.a
    17.  
    18. led.bin:$(objs)
    19.         $(LD) -Tlink.lds -o wdt_reset.elf $^
    20.         $(OBJCOPY) -O binary wdt_reset.elf wdt_reset.bin
    21.         $(OBJDUMP) -D wdt_reset.elf > wdt_reset.dis
    22.         gcc mkv210.c -o mkv210
    23.         ./mkv210 wdt_reset.bin sd.bin
    24.  
    25. lib/libc.a:
    26.         cd lib;  make;  cd ..
    27.  
    28. %.o:%.S
    29.         $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    30.  
    31. %.o:%.c
    32.         $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    33.  
    34. clean:
    35.         rm *.o *.elf *.bin *.dis mkv210 -f
    36.         cd lib; make clean; cd ..

            结果示例: 

    demo4:

            中断（alarm）读写RTC

            start.S

    1. #define WTCON           0xE2700000
    2. #define SVC_STACK       0xd0037d80
    3. #define IRQ_STACK       0xd0037f80
    4.  
    5. .global _start
    6. .global IRQ_handler
    7.  
    8. _start:
    9.         //close watchDog
    10.         ldr r0,=WTCON
    11.         ldr r1,=0x0
    12.         str r1,[r0]
    13.  
    14.         //init SVC stack
    15.         ldr sp,=SVC_STACK
    16.  
    17.         //init icache
    18.         mrc p15,0,r0,c1,c0,0
    19.         bic r0,r0,#(1<<12)      //close icache
    20.         orr r0,r0,#(1<<12)      //open icache
    21.         mcr p15,0,r0,c1,c0,0
    22.  
    23.         //use func
    24.         bl main
    25.  
    26.         b .
    27.  
    28. //all interrupt process:Protect the scene + mian iqr process + return scene
    29. IRQ_handler:
    30.         //init IRQ_STACK
    31.         ldr sp, =IRQ_STACK
    32.         //protect lr
    33.         sub lr, lr, #4
    34.         //protect r0--r12 that in irq stack
    35.         stmfd sp!, {r0-r12, lr}
    36.         //mian iqr process
    37.         bl irq_handler
    38.         //return scene
    39.         ldmfd sp!, {r0-r12, pc}^

            main.c  

    1. #include "uart_printf.h"
    2. #include "rtc_alarm.h"
    3. #include "stdio.h"
    4.  
    5. static void dealy_time()
    6. {
    7.         volatile unsigned int i,j;
    8.         for (i=0; i<10000; i++)
    9.                         for (j=0; j<1000; j++);
    10. }
    11.  
    12. int main()
    13. {
    14.         //init uart
    15.         init_uart();
    16.         printf("init uart over\n");
    17.  
    18.         //init outer interupt
    19.          printf("rtc init\n");
    20.         rtc_alarm();
    21.  
    22.         //set RTC time
    23.         struct rtc_time rtc_write = 
    24.         {
    25.                 .year = 2023,
    26.                 .month = 10,
    27.                 .date = 22,
    28.                 .hour = 14,
    29.                 .minute = 00,
    30.                 .second = 00,
    31.                 .day = 0,
    32.         };
    33.  
    34.         set_rtc_time(&rtc_write);
    35.  
    36.         //init inner interupt
    37.         printf("init inner\n");
    38.         init_inner_interrupt();
    39.  
    40.         struct rtc_time rtc_read;
    41.  
    42.         //dealy time
    43.         while(1)
    44.         {
    45.                 get_rtc_time(&rtc_read);
    46.                 printf("rtc time:%d-%d-%d--%d %d:%d:%d\n", rtc_read.year,rtc_read.month,rtc_read.date,rtc_read.day,rtc_read.hour,rtc_read.minute,rtc_read.second);
    47.                 dealy_time();
    48.         }
    49.  
    50.         while(1); 
    51.         return 0;
    52. }

            uart_printf.h 

    void init_uart();

             uart_printf.c

    1. #define GPA0CON         0xE0200000
    2.  
    3. #define ULCON0          0xE2900000
    4. #define UCON0           0xE2900004
    5. #define UFCON0          0xE2900008
    6. #define UMCON0          0xE290000C
    7. #define UTRSTAT0        0xE2900010
    8. #define UTXH0           0xE2900020
    9. #define URXH0           0xE2900024
    10. #define UBRDIV0         0xE2900028
    11. #define UDIVSLOT0       0xE290002C
    12.  
    13. #define rGPA0CON        (*(volatile unsigned int *)GPA0CON)
    14. #define rULCON0         (*(volatile unsigned int *)ULCON0)
    15. #define rUCON0          (*(volatile unsigned int *)UCON0)
    16. #define rUFCON0         (*(volatile unsigned int *)UFCON0)
    17. #define rUMCON0         (*(volatile unsigned int *)UMCON0)
    18. #define rUTRSTAT0       (*(volatile unsigned int *)UTRSTAT0)
    19. #define rUTXH0          (*(volatile unsigned int *)UTXH0)
    20. #define rURXH0          (*(volatile unsigned int *)URXH0)
    21. #define rUBRDIV0        (*(volatile unsigned int *)UBRDIV0)
    22. #define rUDIVSLOT0      (*(volatile unsigned int *)UDIVSLOT0)
    23.  
    24. //init uart
    25. void init_uart()
    26. {
    27.         //set gpio as uart(rx,tx)
    28.         rGPA0CON &= ~(0xff);
    29.         rGPA0CON |= ((1<<2)|(1<<5));
    30.  
    31.         //set uart base configure(mode)
    32.         rULCON0 = 0x3;
    33.         rUCON0 = 0x5;
    34.         rUMCON0 = 0;
    35.         rUFCON0 = 0;
    36.  
    37.         //set uart baud
    38.         //DIV_VAL = (PCLK / (bps x 16))-1
    39.         //(66000000 /(115200 * 16)) -1 = 34.8
    40.         rUBRDIV0 = 34;
    41.  
    42.         //set uart baud calibration
    43.         //0.8 * 16 = 13,check 210 table
    44.         rUDIVSLOT0 = 0xdfdd;
    45. }
    46.  
    47.  
    48. //send data
    49. void putc(char data)
    50. {                  
    51.         while (!(rUTRSTAT0 & (1<<1)));
    52.         rUTXH0 = data;
    53. }
    54.  
    55. //receive data
    56. char getc()
    57. {
    58.         while (!(rUTRSTAT0 & (1<<0)));
    59.         return (rURXH0 & 0xff);
    60. }

      rtc_struct.h      

    1. struct rtc_time
    2. {
    3.         unsigned int year;
    4.         unsigned int month;
    5.         unsigned int date;                      //几号
    6.         unsigned int hour;
    7.         unsigned int minute;
    8.         unsigned int second;
    9.         unsigned int day;                       //星期
    10. };

             rtc_alarm.h

    1. #include "rtc_struct.h"
    2.  
    3. void rtc_alarm();
    4.  
    5. void set_rtc_time(struct rtc_time  *p);
    6.  
    7. void get_rtc_time(struct rtc_time  *p);
    8.  
    9. void init_inner_interrupt();

            rtc_alarm.c

    1. #include "stdio.h"
    2. #include "rtc_struct.h"
    3.  
    4. //rtc interrupt register
    5.  
    6. #define RTC_BASE        0xE2800000
    7.  
    8. #define         rINTP            (*((volatile unsigned long *)(RTC_BASE + 0x30)))
    9. #define         rRTCCON          (*((volatile unsigned long *)(RTC_BASE + 0x40)))
    10. #define         rTICCNT          (*((volatile unsigned long *)(RTC_BASE + 0x44)))
    11. #define         rRTCALM          (*((volatile unsigned long *)(RTC_BASE + 0x50)))
    12. #define         rALMSEC          (*((volatile unsigned long *)(RTC_BASE + 0x54)))
    13. #define         rALMMIN          (*((volatile unsigned long *)(RTC_BASE + 0x58)))
    14. #define         rALMHOUR         (*((volatile unsigned long *)(RTC_BASE + 0x5c)))
    15. #define         rALMDATE         (*((volatile unsigned long *)(RTC_BASE + 0x60)))
    16. #define         rALMMON          (*((volatile unsigned long *)(RTC_BASE + 0x64)))
    17. #define         rALMYEAR         (*((volatile unsigned long *)(RTC_BASE + 0x68)))
    18. #define         rRTCRST          (*((volatile unsigned long *)(RTC_BASE + 0x6c)))
    19. #define         rBCDSEC          (*((volatile unsigned long *)(RTC_BASE + 0x70)))
    20. #define         rBCDMIN          (*((volatile unsigned long *)(RTC_BASE + 0x74)))
    21. #define         rBCDHOUR         (*((volatile unsigned long *)(RTC_BASE + 0x78)))
    22. #define         rBCDDATE         (*((volatile unsigned long *)(RTC_BASE + 0x7c)))
    23. #define         rBCDDAY          (*((volatile unsigned long *)(RTC_BASE + 0x80)))
    24. #define         rBCDMON          (*((volatile unsigned long *)(RTC_BASE + 0x84)))
    25. #define         rBCDYEAR         (*((volatile unsigned long *)(RTC_BASE + 0x88)))
    26. #define         rCURTICCNT       (*((volatile unsigned long *)(RTC_BASE + 0x90)))
    27. #define         rRTCLVD          (*((volatile unsigned long *)(RTC_BASE + 0x94)))
    28.  
    29. //inner interrupt register
    30.  
    31. //VIC base address
    32.  
    33. #define VIC0_BASE       0xF2000000
    34. #define VIC1_BASE       0xF2100000
    35. #define VIC2_BASE       0xF2200000
    36. #define VIC3_BASE       0xF2300000
    37.  
    38. //VIC0 register
    39.  
    40. #define rVIC0IRQSTATUS          (*(volatile unsigned int *)(VIC0_BASE + 0x0000))
    41. #define rVIC0FIQSTATUS          (*(volatile unsigned int *)(VIC0_BASE + 0x0004))
    42. #define rVIC0INTSELECT          (*(volatile unsigned int *)(VIC0_BASE + 0x000C))
    43. #define rVIC0INTENABLE          (*(volatile unsigned int *)(VIC0_BASE + 0x0010))
    44. #define rVIC0INTENCLEAR         (*(volatile unsigned int *)(VIC0_BASE + 0x0014))
    45. #define rVIC0VECTADDR           (VIC0_BASE + 0x100)
    46. #define rVIC0ADDRESS            (*(volatile unsigned int *)(VIC0_BASE + 0x0F00))
    47.  
    48. //VIC1 register
    49.  
    50. #define rVIC1IRQSTATUS          (*(volatile unsigned int *)(VIC1_BASE + 0x0000))
    51. #define rVIC1FIQSTATUS          (*(volatile unsigned int *)(VIC1_BASE + 0x0004))
    52. #define rVIC1INTSELECT          (*(volatile unsigned int *)(VIC1_BASE + 0x000C))
    53. #define rVIC1INTENABLE          (*(volatile unsigned int *)(VIC1_BASE + 0x0010))
    54. #define rVIC1INTENCLEAR         (*(volatile unsigned int *)(VIC1_BASE + 0x0014))
    55. #define rVIC1VECTADDR           (VIC1_BASE + 0x100)
    56. #define rVIC1ADDRESS            (*(volatile unsigned int *)(VIC1_BASE + 0x0F00))
    57.  
    58. //VIC2 register
    59.  
    60. #define rVIC2IRQSTATUS          (*(volatile unsigned int *)(VIC2_BASE + 0x0000))
    61. #define rVIC2FIQSTATUS          (*(volatile unsigned int *)(VIC2_BASE + 0x0004))
    62. #define rVIC2INTSELECT          (*(volatile unsigned int *)(VIC2_BASE + 0x000C))
    63. #define rVIC2INTENABLE          (*(volatile unsigned int *)(VIC2_BASE + 0x0010))
    64. #define rVIC2INTENCLEAR         (*(volatile unsigned int *)(VIC2_BASE + 0x0014))
    65. #define rVIC2VECTADDR           (VIC2_BASE + 0x100)
    66. #define rVIC2ADDRESS            (*(volatile unsigned int *)(VIC2_BASE + 0x0F00))
    67.  
    68. //VIC3 register
    69.  
    70. #define rVIC3IRQSTATUS          (*(volatile unsigned int *)(VIC3_BASE + 0x0000))
    71. #define rVIC3FIQSTATUS          (*(volatile unsigned int *)(VIC3_BASE + 0x0004))
    72. #define rVIC3INTSELECT          (*(volatile unsigned int *)(VIC3_BASE + 0x000C))
    73. #define rVIC3INTENABLE          (*(volatile unsigned int *)(VIC3_BASE + 0x0010))
    74. #define rVIC3INTENCLEAR         (*(volatile unsigned int *)(VIC3_BASE + 0x0014))
    75. #define rVIC3VECTADDR           (VIC3_BASE + 0x100)
    76. #define rVIC3ADDRESS            (*(volatile unsigned int *)(VIC3_BASE + 0x0F00))
    77.  
    78. //interrupt vector table
    79.  
    80. #define vector_table_base       0xD0037400
    81.  
    82. #define reset_vector            (vector_table_base + 0x00)
    83. #define undef_vector            (vector_table_base + 0x04)
    84. #define sotf_interrupt_vector   (vector_table_base + 0x08)
    85. #define prefetch_vector         (vector_table_base + 0x0C)
    86. #define data_vector             (vector_table_base + 0x10)
    87. #define irq_vector              (vector_table_base + 0x18)
    88. #define fiq_vector              (vector_table_base + 0x1C)
    89.  
    90. #define r_reset_vector                  (*(volatile unsigned int *) reset_vector)
    91. #define r_undef_vector                  (*(volatile unsigned int *) undef_vector)
    92. #define r_sotf_interrupt_vector         (*(volatile unsigned int *) sotf_interrupt_vector)
    93. #define r_prefetch_vector               (*(volatile unsigned int *) prefetch_vector)
    94. #define r_data_vector                   (*(volatile unsigned int *) data_vector)
    95. #define r_irq_vector                    (*(volatile unsigned int *) irq_vector)
    96. #define r_fiq_vector                    (*(volatile unsigned int *) fiq_vector)
    97.  
    98. //interrupt number
    99.  
    100. #define NUM_TIMER0                              (21)
    101. #define NUM_TIMER1                              (22)
    102. #define NUM_TIMER2                              (23)
    103. #define NUM_TIMER3                              (24)
    104. #define NUM_TIMER4                              (25)
    105. #define NUM_SYSTIMER                            (26)
    106. #define NUM_WDT                                 (27)
    107. #define NUM_RTC_ALARM                           (28)
    108. #define NUM_RTC_TICK                            (29)
    109.  
    110. //rtc interrupt func
    111.  
    112. //rtc func
    113.  
    114. static void isr_rtc_alarm()
    115. {
    116.         static int num = 0; 
    117.         printf("rtc interrupt, num = %d...",num++);
    118.         //open rtc alarm interrupt
    119.         rINTP |= (1<<1);
    120.  
    121.         //clear VIC0ADDR,clear using interrupt process
    122.         rVIC0ADDRESS = 0;
    123.         rVIC1ADDRESS = 0;
    124.         rVIC2ADDRESS = 0;
    125.         rVIC3ADDRESS = 0;
    126. }
    127.  
    128. static unsigned int num_2_bcd(unsigned int num)
    129. {
    130.         return (((num / 10)<< 4) | (num % 10));
    131. } 
    132.  
    133. static unsigned int bcd_2_num(unsigned int bcd)
    134. {
    135.         return ((((bcd & (0xf0)) >> 4) *10) + (bcd & (0x0f)) );
    136. }
    137.  
    138. void set_rtc_time(struct rtc_time  *p)
    139. {
    140.         //set RTCCON,open RTC 
    141.         rRTCCON |= 1;
    142.  
    143.         //set year month date,hour min,sec,day
    144.         rBCDYEAR = num_2_bcd(p->year - 2000);
    145.         rBCDMON = num_2_bcd(p->month);
    146.         rBCDDATE = num_2_bcd(p->date);
    147.         rBCDHOUR = num_2_bcd(p->hour);
    148.         rBCDMIN = num_2_bcd(p->minute);
    149.         rBCDSEC = num_2_bcd(p->second);
    150.         rBCDDAY = num_2_bcd(p->day);
    151.  
    152.         //set RTCCON,close RTC 
    153.         rRTCCON &= ~(1);
    154. }
    155.  
    156. void get_rtc_time(struct rtc_time  *p)
    157. {
    158.         //set RTCCON,open RTC 
    159.         rRTCCON |= 1;
    160.  
    161.         //get year month date,hour min,sec,day
    162.         p->year = bcd_2_num(rBCDYEAR) + 2000;
    163.         p->month = bcd_2_num(rBCDMON);
    164.         p->date = bcd_2_num(rBCDDATE);
    165.         p->hour = bcd_2_num(rBCDHOUR);
    166.         p->minute = bcd_2_num(rBCDMIN);
    167.         p->second = bcd_2_num(rBCDSEC);
    168.         p->day = bcd_2_num(rBCDDAY);
    169.         //set RTCCON,close RTC 
    170.         rRTCCON &= ~(1);
    171. }
    172.  
    173. void rtc_alarm()
    174. {
    175.         //set alarm pre 10 trigger
    176.         rALMSEC = num_2_bcd(10);
    177.         //set sec used
    178.         rRTCALM |= 1<<0;
    179.         //set alarm enable
    180.         rRTCALM |= 1<<6;
    181. }
    182.  
    183.  
    184. //inner interrupt func
    185.  
    186. static void reset_func()
    187. {
    188.         printf("reset\n");
    189. }
    190.  
    191. static void undef_func()
    192. {
    193.         printf("undef\n");
    194. }
    195.  
    196. static void sotf_interrupt_func()
    197.  
    198. {
    199.         printf("sotf_intrrupt\n");
    200. }
    201.  
    202. static void prefetch_func()
    203. {
    204.         printf("prefetch\n");
    205. }
    206.  
    207. static void data_func()
    208. {
    209.         printf("data\n");
    210. }
    211.  
    212. static void fiq_func()
    213. {
    214.         printf("irq\n");
    215. }
    216.  
    217. void IRQ_handler();
    218.  
    219. static void bind_isr_VICnINTENCLEAR(unsigned long num,void (*handler)())
    220. {
    221.         if(num <32)
    222.         {
    223.                 printf("bind ok\n");
    224.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num))) = (unsigned)handler;
    225.         }
    226.         else if(num < 64)
    227.         {
    228.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num-32))) = (unsigned)handler;
    229.         }
    230.         else if(num < 96)
    231.         {
    232.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num-64))) = (unsigned)handler;
    233.         }
    234.         else
    235.         {
    236.                 *((volatile unsigned int *)(rVIC0VECTADDR + 4 * (num-96))) = (unsigned)handler;
    237.         }
    238. }
    239.  
    240. static void enable_interrupt(unsigned long num)
    241. {
    242.         unsigned long tmp;
    243.  
    244.         if(num < 32)
    245.         {
    246.                 tmp = rVIC0INTENABLE;
    247.                 tmp |= (1<<num);
    248.                 rVIC0INTENABLE = tmp;
    249.         }
    250.         else if(num < 64)
    251.         {
    252.                 tmp = rVIC0INTENABLE;
    253.                 tmp |= (1<<(num-32));
    254.                 rVIC1INTENABLE = tmp;
    255.         }
    256.         else if(num < 96)
    257.         {
    258.                 tmp = rVIC0INTENABLE;
    259.                 tmp |= (1<<(num-64));
    260.                 rVIC2INTENABLE = tmp;
    261.         }
    262.         else if(num < 200)
    263.         {
    264.                 tmp = rVIC0INTENABLE;
    265.                 tmp |= (1<<(num-96));
    266.                 rVIC3INTENABLE = tmp;
    267.         }
    268.         else
    269.         {
    270.                 rVIC0INTENABLE = 0xffffffff;
    271.                 rVIC1INTENABLE = 0xffffffff;
    272.                 rVIC2INTENABLE = 0xffffffff;
    273.                 rVIC3INTENABLE = 0xffffffff;
    274.         }
    275. }
    276.  
    277. void init_inner_interrupt()
    278. {
    279.         //bind interrupt process on interrupt vector table 
    280.         r_reset_vector           =      (unsigned int)reset_func; 
    281.         r_undef_vector           =      (unsigned int)undef_func;
    282.         r_sotf_interrupt_vector  =      (unsigned int)sotf_interrupt_func;
    283.         r_prefetch_vector        =      (unsigned int)prefetch_func;
    284.         r_data_vector            =      (unsigned int)data_func;
    285.         r_irq_vector             =      (unsigned int)IRQ_handler;
    286.         r_fiq_vector             =      (unsigned int)fiq_func;
    287.  
    288.         //select interrupt mode(irq)
    289.         rVIC0INTSELECT = 0x0;
    290.         rVIC1INTSELECT = 0x0;
    291.         rVIC2INTSELECT = 0x0;
    292.         rVIC3INTSELECT = 0x0;
    293.  
    294.         //diasble interrupt
    295.         rVIC0INTENCLEAR = 0xffffffff;
    296.         rVIC1INTENCLEAR = 0xffffffff;
    297.         rVIC2INTENCLEAR = 0xffffffff;
    298.         rVIC3INTENCLEAR = 0xffffffff;
    299.  
    300.         //clear interrupt process address 
    301.         rVIC0ADDRESS = 0;
    302.         rVIC1ADDRESS = 0;
    303.         rVIC2ADDRESS = 0;
    304.         rVIC3ADDRESS = 0;
    305.  
    306.         //bind isr process on VICnINTENCLEAR
    307.         bind_isr_VICnINTENCLEAR(NUM_RTC_ALARM,isr_rtc_alarm);
    308.  
    309.         //enable interrupt
    310.         enable_interrupt(NUM_RTC_ALARM);
    311. }
    312.  
    313. //judge inner interrupt ,get interrupt occure in which VICnVECTADDR
    314. void irq_handler()
    315. {
    316.         volatile unsigned int n = 0;
    317.         void (*isr)(void) = NULL;
    318.         for(n = 0;n <4;n++)
    319.         {
    320.                 if(n == 0 && rVIC0IRQSTATUS != 0)
    321.                 {
    322.                         isr = (void (*)(void))rVIC0ADDRESS; 
    323.                 }
    324.                 else if(n == 1 && rVIC1IRQSTATUS != 0)
    325.                 {
    326.                         isr = (void (*)(void))rVIC1ADDRESS; 
    327.                 }
    328.                 else if(n == 2 && rVIC2IRQSTATUS != 0)
    329.                 {
    330.                         isr = (void (*)(void))rVIC2ADDRESS; 
    331.                 }
    332.                 else if(n == 3 && rVIC3IRQSTATUS != 0)
    333.                 {
    334.                         isr = (void (*)(void))rVIC3ADDRESS; 
    335.                 }
    336.                 (*isr)();
    337.         }
    338. }

            link.lds 

    1. SECTIONS
    2. {
    3.         . = 0xd0020010;
    4.  
    5.         .text :
    6.         {
    7.                 start.o
    8.                 *(.text)
    9.         }
    10.  
    11.         .data :
    12.         {
    13.                 *(.data)
    14.         }
    15.  
    16.         .bss :
    17.         {
    18.                 *(.bss)
    19.         }
    20. }

            Makefile 

    1. CC      =       arm-linux-gcc
    2. LD      =       arm-linux-ld
    3. OBJCOPY =       arm-linux-objcopy
    4. OBJDUMP =       arm-linux-objdump
    5.  
    6. INCDIR  := $(shell pwd)
    7.  
    8. #预处理器的flag，flag就是编译器可选的选项
    9. CPPFLAGS  := -nostdlib -nostdinc -I$(INCDIR)/include
    10. #C编译器的flag
    11. CFLAGS    := -Wall -O2 -fno-builtin
    12.  
    13. export CC LD OBJCOPY OBJDUMP CPPFLAGS CFLAGS
    14.  
    15. objs      := start.o uart_printf.o main.o rtc_alarm.o
    16. objs      += lib/libc.a
    17.  
    18. led.bin:$(objs)
    19.         $(LD) -Tlink.lds -o rtc_alarm.elf $^
    20.         $(OBJCOPY) -O binary rtc_alarm.elf rtc_alarm.bin
    21.         $(OBJDUMP) -D rtc_alarm.elf > rtc_alarm.dis
    22.         gcc mkv210.c -o mkv210
    23.         ./mkv210 rtc_alarm.bin sd.bin
    24.  
    25. lib/libc.a:
    26.         cd lib;  make;  cd ..
    27.  
    28. %.o:%.S
    29.         $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    30.  
    31. %.o:%.c
    32.         $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c
    33.  
    34. clean:
    35.         rm *.o *.elf *.bin *.dis mkv210 -f
    36.         cd lib; make clean; cd ..

    结果示例: 

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  • 原文地址：https://blog.csdn.net/tyro_wzp/article/details/133947675