DSP2335的按键输入key工程笔记

配置输入

时钟

方向

下拉

本文使用的是矩阵按键  12 13 14 为物理上拉输入，48 49 50为输出；

可以考虑输入AQ滤波；里面没有加；

/*
 * key.c
 *
 *  Created on: 2023年11月19日
 *      Author: peng
 */
#include"key.h"
#include"led1.h"
void key_init(void)
{
    EALLOW;
    SysCtrlRegs.PCLKCR3.bit.GPIOINENCLK=1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO12 = 0;//输入
    GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;
 
    GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO13 = 0;//输入
    GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0;
 
    GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO14 = 0;//输入
    GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0;
    //输出
    GpioCtrlRegs.GPBMUX2.bit.GPIO48 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO48 = 1;//
    GpioCtrlRegs.GPBPUD.bit.GPIO48 = 0;
 
    GpioCtrlRegs.GPBMUX2.bit.GPIO49 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO49 = 1;//
    GpioCtrlRegs.GPBPUD.bit.GPIO49 = 0;
 
    GpioCtrlRegs.GPBMUX2.bit.GPIO50 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO50 = 1;//
    GpioCtrlRegs.GPBPUD.bit.GPIO50 = 0;
 
    EDIS;
    GpioDataRegs.GPBSET.bit.GPIO48 = 1;
    GpioDataRegs.GPBSET.bit.GPIO49 = 1;
    GpioDataRegs.GPBSET.bit.GPIO50 = 1;
}
 
unsigned char read_row()
{
    unsigned char temp=0;
    temp=( GpioDataRegs.GPADAT.bit.GPIO12<<0| GpioDataRegs.GPADAT.bit.GPIO13<<1| GpioDataRegs.GPADAT.bit.GPIO14<<2);
    return temp;
}
unsigned char read_line()
{
    unsigned char temp=0;
    temp= (
     GpioDataRegs.GPBDAT.bit.GPIO48
    |((GpioDataRegs.GPBDAT.bit.GPIO49&0x01)<<1)
    |((GpioDataRegs.GPBDAT.bit.GPIO50&0x01)<<2)
    );
    return temp;
}
 
void  _SCAN_line(char x)
{
    GpioDataRegs.GPBDAT.bit.GPIO48=~((long)0x01&x);
    GpioDataRegs.GPBDAT.bit.GPIO49=~(((long)0x02&x)>>1);
    GpioDataRegs.GPBDAT.bit.GPIO50=~(((long)0x04&x)>>2);
}
char  SCAN_row ()
{
     return GpioDataRegs.GPADAT.bit.GPIO12<<0| GpioDataRegs.GPADAT.bit.GPIO13<<1| GpioDataRegs.GPADAT.bit.GPIO14<<2;
}
 
char key_scan()
{
    char key = 0;
    unsigned char i = 0,tt=0x1;
    unsigned int temp=0;
    unsigned char p48=0,p49=0,p50=0;
    tt=~tt;
    static char key_up_flag = 0,key_breakup=0;
 
    for ( i = 0; i < 3; i++)
    {
        switch (i)//列扫描
        {
        case 0: _SCAN_line(1);
 
        break;
        case 1: _SCAN_line(2);
        break;
        case 2: _SCAN_line(4);
        break;
        default:
            break;
        }
 
        if ( (temp=(SCAN_row() & 0x07) )!= 0x07 )//被按下
        {
            DELAY_US(10000);
            if ((temp=(SCAN_row() & 0x07)) != 0x07)
            {
 
                key_up_flag = 1;
                switch (temp=( ~temp)&0x07 )
                {
 
                case 1: key = (temp - 1) * 3 + i+1; key_breakup = key;return 0;
                case 2: key = (temp- 1) * 3 + i+1 ; key_breakup = key;return 0;
                case 4: key = (temp - 1) * 3 + i+1;  key_breakup = key;return 0;
 
                default:key = 0;
                    break;
                }
               // key_breakup = key;
            }
        }
        else
        {
            if (key_up_flag == 1)
            {
                key_up_flag = 0;
                return key_breakup;
            }
        }
    }
    return 0;
}
 
void key_LED()//按键控制LED
{
    //char key = 0;
    switch (key_scan())
    {
    case 1:  LED1_TOGGLE; break;
    case 2:  LED2_TOGGLE; break;
    case 3:  LED3_TOGGLE; break;
    default: break;
    }
 
 
}