• ARM_LED实现

    1. .text 
    2. .global _start
    3. _start: 
    4. @1.RCC时钟使能GPIOE   RCC_MP_AHB4ENSETR[4]->1
    5.  
    6. LDR R0,=0x50000a28
    7. LDR R1,[R0]
    8. ORR R1,R1,#(0x1<<4)
    9. STR R1,[R0]
    10.  
    11. @2.设置PE10为输出模式  GPIOE_MODER[21:20]->01
    12.     
    13. LDR R0,=0x50006000
    14. LDR R1,[R0]
    15. BIC R1,R1,#(0x3<<20)
    16. ORR R1,R1,#(0x1<<20)
    17. STR R1,[R0]
    18.  
    19. @3.设置PE10为推挽输出  GPIOE_OTYPER[10]->0
    20.  
    21. LDR R0,=0x50006004
    22. LDR R1,[R0]
    23. BIC R1,R1,#(0x1<<10)
    24. STR R1,[R0]
    25.  
    26. @4.设置PE10为低速输出  GPIOE_OSPEEDR[21:20]->00
    27.  
    28. LDR R0,=0x50006008
    29. LDR R1,[R0]
    30. BIC R1,R1,#(0x3<<20)
    31. STR R1,[R0]
    32.  
    33. @5.设置PE10输出无上拉下拉 GPIOE_PUPDR[21:20]->00
    34.  
    35. LDR R0,=0x5000600C
    36. LDR R1,[R0]
    37. BIC R1,R1,#(0x3<<20)
    38. STR R1,[R0]
    39.  
    40. @led2
    41. ldr r2,=0x50000a28
    42. ldr r3,[r2]
    43. orr r3,r3,#(0x1<<5)
    44. str r3,[r2]
    45.  
    46. ldr r2,=0x50007000
    47. ldr r3,[r2]
    48. bic r3,r3,#(0x3<<20)
    49. orr r3,r3,#(0x1<<20)
    50. str r3,[r2]
    51.  
    52. ldr r2,=0x50007004
    53. ldr r3,[r2]
    54. bic r3,r3,#(0x1<<10)
    55. str r3,[r2]
    56.  
    57. ldr r2,=0x50007008
    58. ldr r3,[r0]
    59. bic r3,r3,#(0x3<<20)
    60. str r3,[r0]
    61.  
    62. ldr r2,=0x5000700C
    63. ldr r3,[r0]
    64. bic r3,r3,#(0x3<<20)
    65. str r3,[r0]
    66.  
    67. @led3
    68. ldr r4,=0x50000a28
    69. ldr r5,[r4]
    70. orr r5,r5,#(0x1<<4)
    71. str r5,[r4]
    72.  
    73. ldr r4,=0x50006000
    74. ldr r5,[r4]
    75. bic r5,r5,#(0x3<<16)
    76. orr r5,r5,#(0x1<<16)
    77. str r5,[r4]
    78.  
    79. ldr r4,=0x50006004
    80. ldr r5,[r4]
    81. bic r5,r5,#(0x1<<8)
    82. str r5,[r4]
    83.  
    84. ldr r4,=0x50006008
    85. ldr r5,[r4]
    86. bic r5,r5,#(0x3<<16)
    87. str r5,[r4]
    88.  
    89. ldr r4,=0x5000600C
    90. ldr r5,[r4]
    91. bic r5,r5,#(0x3<<16)
    92. str r5,[r4]
    93.  
    94. loop:
    95. bl led1_on
    96. bl delay
    97.  
    98. bl led1_off
    99. bl delay
    100.  
    101. bl led2_on
    102. bl delay
    103.  
    104. bl led2_off
    105. bl delay
    106.  
    107. bl led3_on
    108. bl delay
    109.  
    110. bl led3_off
    111. bl delay
    112.  
    113. b loop
    114.  
    115. led1_on:
    116. LDR R0,=0x50006014
    117. LDR R1,[R0]
    118. ORR R1,R1,#(0x1<<10)
    119. STR R1,[R0] 
    120. mov pc,lr
    121.  
    122. led1_off:
    123. LDR R0,=0x50006014
    124. LDR R1,[R0]
    125. BIC R1,R1,#(0x1<<10)
    126. STR R1,[R0] 
    127. mov pc,lr
    128.  
    129. led2_on:
    130. ldr r2,=0x50007014
    131. ldr r3,[r2]
    132. orr r3,r3,#(0x1<<10)
    133. str r3,[r2]
    134. mov pc,lr
    135.  
    136. led2_off:
    137. ldr r2,=0x50007014
    138. ldr r3,[r2]
    139. bic r3,r3,#(0x1<<10)
    140. str r3,[r2]
    141. mov pc,lr
    142.  
    143. led3_on:
    144. ldr r4,=0x50006014
    145. ldr r5,[r4]
    146. orr  r5,r5,#(0x1<<8)
    147. str r5,[r4]
    148. mov pc,lr
    149.  
    150. led3_off:
    151. ldr r4,=0x50006014
    152. ldr r5,[r4]
    153. bic r5,r5,#(0x1<<8)
    154. str r5,[r4]
    155. mov pc,lr
    156.  
    157. @封装汇编的延时函数
    158. delay:
    159.     LDR R1,=0X10000000
    160. mm:
    161.     cmp R1,#0
    162.     SUBNE R1,R1,#1
    163.     BNE mm
    164.     mov pc,lr	
    165.  
    166. .end

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  • 原文地址：https://blog.csdn.net/wwjj26/article/details/134339488