STM32矩阵键盘实现方法收集

STM32用矩阵键盘，不带外部中断，可以多个按键同时按下C代码: STM32用矩阵键盘，不带外部中断，可以多个按键同时按下/**************矩阵键盘.h文件*********************************/#ifndef __COMMON_H#define __COMMON_H#include ""/* 4*4矩阵键盘 */void keyboard_init(void);void update_key(void);extern unsigned char key[4][4];#endif/**************矩阵键盘.c文件*****************************/#include ""struct io_port {GPIO_TypeDef *GPIO_x;unsigned short GPIO_pin;};static struct io_port key_output[4] = {{GPIOD, GPIO_Pin_0}, {GPIOD, GPIO_Pin_1},{GPIOD, GPIO_Pin_2}, {GPIOD, GPIO_Pin_3}static struct io_port key_input[4] = {{GPIOD, GPIO_Pin_4}, {GPIOD, GPIO_Pin_5},{GPIOD, GPIO_Pin_6}, {GPIOD, GPIO_Pin_7}};unsigned char key[4][4];void keyboard_init(void){GPIO_InitTypeDef GPIO_InitStructure;unsigned char i;/* 键盘行扫描输出线输出高电平 *//* PA0 PA1 PA2 PA3 输出*/= GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;= GPIO_Mode_Out_PP;= GPIO_Speed_50MHz;GPIO_Init(GPIOD, &GPIO_InitStructure);/* 键盘列扫描输入线键被按时输入高电平放开输入低电平 *//* PA4 PA5 PA6 PA7 输入*/= GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;= GPIO_Mode_IPU;GPIO_Init(GPIOD, &GPIO_InitStructure);for(i = 0; i < 4; i++){GPIO_SetBits(key_output[i].GPIO_x, key_output[i].GPIO_pin);}void update_key(void){unsigned char i, j;for(i = 0; i < 4; i++) PIO_x, key_output[i].GPIO_pin);for(j = 0; j < 4; j++) PIO_x, key_input[j].GPIO_pin) == 0){key[i][j] = 1;}else{key[i][j] = 0;}}GPIO_SetBits(key_output[i].GPIO_x, key_output[i].GPIO_pin);}}stm32 矩阵键盘这是硬件上的键盘规划// | 1 | 2 | 3 | 4 | ---line 1 PE6 //// --------------------------- //// | 5 | 6 | 7 | 8 | ---line 2 PE5 //// --------------------------- //// | 9 | 10| 11| 12| ---line 3 PE4 //// --------------------------- //// | 13| 14| 15| 16| ---line 4 PE3 //// --------------------------- //// | 17| 18| 19| 20| ---line 5 PE2 //// --------------------------- //// | | | | //// col1 col2 col3 col4 //// PE0 PB5 PB8 PB9 ////_________________________________________________//参考了下基于avr的矩阵键盘程序，耐着性子移植到符合上面硬件规划的stm32板子上。

volatile uint8_t key_flag = 0;void key_init(void){RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE | RCC_APB2Periph_GPIOB, ENABLE);GPIO_InitTypeDef GPIO_InitStructure;//key output= GPIO_Mode_Out_PP;= GPIO_Speed_50MHz;= GPIO_Pin_0;GPIO_Init(GPIOE,&GPIO_InitStructure);= GPIO_Pin_5 | GPIO_Pin_8 | GPIO_Pin_9;GPIO_Init(GPIOB,&GPIO_InitStructure);//key input= GPIO_Mode_IPU;//上拉输入= GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6; GPIO_Init(GPIOE,&GPIO_InitStructure);}//判断是否有键按下函数，对键盘进行一次扫描//返回键盘接口状态，有键按下时返回键值；没有键按下返回无效标志位uint8_t Is_Key_PressOn(void){volatile uint8_t i,ScanCode;for(i=0;i<4;i++){switch(i) //扫描信号产生{case 0:GPIOE->BSRR = 0x00010000;//PE0 = 0;GPIOB->BSRR = 0x00000320;//PB5 = 1; PB8 = 1; PB9 = 1;key_flag = 1;break;case 1:GPIOE->BSRR = 0x00000001;//PE0 = 1;GPIOB->BSRR = 0x00200300;//PB5 = 0; PB8 = 1; PB9 = 1;key_flag = 2;break;case 2:GPIOE->BSRR = 0x00000001;//PE0 = 1;GPIOB->BSRR = 0x01000220;//PB5 = 1; PB8 = 0; PB9 = 1;key_flag = 3;break;case 3:GPIOE->BSRR = 0x00000001;//PE0 = 1;GPIOB->BSRR = 0x02000120;//PB5 = 1; PB8 = 1; PB9 = 0;key_flag = 4;break;default: key_flag = 0; break;}if((((uint8_t)GPIOE->IDR)|0x83)!=0xff)return ((uint8_t)GPIOE->IDR | 0x83);}return(PRESS_INVALID);}//找到闭合键,判断延时前后两次键值是否相同，如果相同则返回键值uint8_t Find_Key_PressOn(uint8_t KeyCode_before,uint8_t KeyCode_after) {if(KeyCode_before==KeyCode_after) return(KeyCode_after);else return(PRESS_INVALID);}//计算键值,根据返回的键值计算相应的返回值uint8_t Calc_Key_PressOn(uint8_t KeyCode){uint8_t TempNum; switch(KeyCode){case 0xBF:if(1==key_flag){TempNum = 1;break; }else if(2==key_flag) {TempNum = 2;break; }else if(3==key_flag) {TempNum = 3;break; }else if(4==key_flag) {TempNum = 4;break; }else break;case 0xDF:if(1==key_flag){TempNum = 5;break; }else if(2==key_flag){TempNum = 6;break; }else if(3==key_flag) {TempNum = 7;break; }else if(4==key_flag) {TempNum = 8;break; }else break;case 0xEF:if(1==key_flag){TempNum = 9;break; }else if(2==key_flag) {TempNum = 10;break; }else if(3==key_flag) {TempNum = 11;break; }else if(4==key_flag) {TempNum = 12;break; }else break;case 0xF7:if(1==key_flag){TempNum = 13;break; }else if(2==key_flag) {TempNum = 14;break; }else if(3==key_flag) {TempNum = 15;break; }else if(4==key_flag) {TempNum = 16;break; }else break;case 0xFB:if(1==key_flag){TempNum = 17;break; }else if(2==key_flag){TempNum = 18;break;}else if(3==key_flag){TempNum = 19;break;}else if(4==key_flag){TempNum = 20;break;}else break;default : TempNum=0;break; //发生错误时返回，无效标志}return(TempNum); //正常返回值为1~16}//键盘扫描主程序uint8_t Keyboard(void){uint8_t key_temp; //暂存键值的变量key_temp=Is_Key_PressOn(); //判断是否有键闭合// PORTC=key_temp; 调试过程中使用，正常运行时没用可以删除if (key_temp==PRESS_INVALID) //判断该次扫描中是否有键按下return(PRESS_INVALID); //没有闭合则建立无效标志elsedelay_nus(100); //闭合则延时key_temp=Find_Key_PressOn(key_temp,((uint8_t)GPIOE->IDR | 0x83)); //找到闭合键if (key_temp==PRESS_INVALID)return(key_temp); //若延时前后键值不相等则返回无效标志elsekey_temp=Calc_Key_PressOn(key_temp); //有效则计算键值while((((uint8_t)GPIOE->IDR)|0x83)!=0xff)//等待键放。