二、源码部分
keyboard.c
#include "keyboard.h"
/*
* @Description: 初始化 矩阵按键的I/O口
* @param 1 – 参数 1：无
* [url=home.php?mod=space&uid=266161]@return[/url] – 返回值：无
*/
void Keyboard_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
//LINE
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//ROW
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
}
/*
* @Description: 矩阵按键扫描函数
* @param 1 – *key_val：存储 当前按键的数值
* @return – 返回值：无
*/
void keyboard_scan(u16 *key_val)
{
uint16_t temp=0;
GPIOA->ODR=0X00;
GPIOA->ODR=0XF7;
if((GPIOA->IDR&0XF0)!=0XF0){
delay_ms(10);
if((GPIOA->IDR & 0XF0)!=0XF0){
temp=(GPIOA->IDR&0XF7);
switch(temp){
case 0xE7: *key_val = 13; break;
case 0xD7: *key_val = 14; break;
case 0xB7: *key_val = 15; break;
case 0x77: *key_val = 16; break;
default: *key_val = 0; break;
}
}while((GPIOA->IDR&0XF7) != 0XF7);
}
GPIOA->ODR=0X00;
GPIOA->ODR=0XFB;
if((GPIOA->IDR&0XF0)!=0XF0){
delay_ms(10);
if((GPIOA->IDR & 0XF0)!=0XF0){
temp=(GPIOA->IDR&0XFB);
switch(temp){
case 0xEB: *key_val = 9; break;
case 0xDB: *key_val = 10; break;
case 0xBB: *key_val = 11; break;
case 0x7B: *key_val = 12 ; break;
default: *key_val = 0; break;
}
}while((GPIOA->IDR&0XFB) != 0XFB);
}
GPIOA->ODR=0X00;
GPIOA->ODR=0XFD;
if((GPIOA->IDR&0XF0)!=0XF0){ //GPIOA->IDR：读取置1的IO口，这里就是读取 PA7-PA4管脚的电平
delay_ms(10);
if((GPIOA->IDR & 0XF0)!=0XF0){
temp=(GPIOA->IDR&0XFD);
switch(temp){
case 0xED: *key_val = 5; break;
case 0xDD: *key_val = 6; break;
case 0xBD: *key_val = 7; break;
case 0x7D: *key_val = 8; break;
default: *key_val = 0; break;
}
}while((GPIOA->IDR&0XFD) != 0XFD);
}
GPIOA->ODR=0X00;
GPIOA->ODR=0XFE;
if((GPIOA->IDR&0XF0)!=0XF0){
delay_ms(10);
if((GPIOA->IDR & 0XF0)!=0XF0){
temp=(GPIOA->IDR&0XFE);
switch(temp){
case 0xEE: *key_val = 1; break;
case 0xDE: *key_val = 2; break;
case 0xBE: *key_val = 3; break;
case 0x7E: *key_val = 4; break;
default: *key_val = 0; break;
}
}while((GPIOA->IDR&0XFE) != 0XFE);
}
}
/*
* @Description: 返回自定义按键数值
* @param 1 – 参数 1：无
* @return – count：按键数值
*/
u16 fetch_key_value(void){
u16 key = 0,count = 22;
keyboard_scan(&key);
switch(key){
case 0: // 没有按键按下时
count = 22; break;
case 1: // S1
count = 1; break;
case 2: // S2
count = 2; break;
case 3: // S3
count = 3; break;
case 4: // S4
count = 17; break;
case 5: // S5
count = 4; break;
case 6: // S6
count = 5; break;
case 7: // S7
count = 6; break;
case 8: // S8
count = 18; break;
case 9: // S9
count = 7; break;
case 10: // S10
count = 8; break;
case 11: // S11
count = 9; break;
case 12: // S12
count = 12; break;
case 13: // S13
count = 13; break;
case 14: // S14
count = 0; break;
case 15: // S15
count = 15; break;
case 16: // S16
count = 16; break;
}return count;
}
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