薄膜键盘驱动（STM32）

一、前期准备 单片机：STM32F103ZET6 开发环境：MDK5.14 固件库：标准库 V3.5 薄膜开关：淘宝上很多，价格便宜

薄膜开关原理图：

二、实验效果 串口配置： 开机欢迎信息： 实验效果：

三、驱动原理 如原理图所示，薄膜开关分为行和列，只要分别对其进行扫描便可以得出是哪一个按键按下的了。行扫描时，需要把行对应的IO口设置成上拉输入，列设置成推挽输出并全部赋值为0。行对应的IO口检测是否有低电平的输入，从而判断是哪一行按下了。列扫描与行扫描一样，只不过对应的IO状态不一样，具体的见 驱动代码。需要完整工程或者有问题的请加QQ：1002521871，验证：呵呵。

四、驱动代码 MatrixKey.h

#ifndef __MATRIX_KEY_H__ #define __MATRIX_KEY_H__ #include "stm32f10x.h" #include "gpio.h" #include "delay.h" //C0,C2,A0,A2,A4,A6,C4,B0 #define ROW_1 PCout(0) #define ROW_2 PCout(2) #define ROW_3 PAout(0) #define ROW_4 PAout(2) #define COL_1 PAout(4) #define COL_2 PAout(6) #define COL_3 PCout(4) #define COL_4 PBout(0) #define ROW1 GPIO_Pin_0 #define ROW2 GPIO_Pin_2 #define ROW3 GPIO_Pin_0 #define ROW4 GPIO_Pin_2 #define COL1 GPIO_Pin_4 #define COL2 GPIO_Pin_6 #define COL3 GPIO_Pin_4 #define COL4 GPIO_Pin_0 typedef enum { Column, Row, Normal } MatirxMode; extern void MatrixKeyConfiguration(void); extern uint8_t GetMatrixKeyValue(void); #endif

MatrixKey.c

#include "matrixkey.h" //R1,R2,R3,R4,C1,C2,C3,C4 //C0,C2,A0,A2,A4,A6,C4,B0 void MatrixModeConfig(MatirxMode mode); void MatrixKeyConfiguration(void) { GPIO_InitTypeDef GPIO; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC, ENABLE); //Register IO GPIO.GPIO_Pin = ROW3 | ROW4 | COL1 | COL2; GPIO.GPIO_Speed = GPIO_Speed_50MHz; GPIO.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOA, &GPIO); GPIO.GPIO_Pin = COL4; GPIO_Init(GPIOB, &GPIO); GPIO.GPIO_Pin = ROW1 | ROW2 | COL3; GPIO_Init(GPIOC, &GPIO); ROW_1 = 1; ROW_2 = 1; ROW_3 = 1; ROW_4 = 1; COL_1 = 1; COL_2 = 1; COL_3 = 1; COL_4 = 1; //MatrixModeConfig(Column); } //R1,R2,R3,R4,C1,C2,C3,C4 //C0,C2,A0,A2,A4,A6,C4,B0 void MatrixModeConfig(MatirxMode mode) { GPIO_InitTypeDef GPIO; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC, ENABLE); switch(mode) { case Column: GPIO.GPIO_Pin = ROW1 | ROW2; GPIO.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init(GPIOC, &GPIO); GPIO.GPIO_Pin = ROW3 | ROW4; GPIO_Init(GPIOA, &GPIO); //==============================================// GPIO.GPIO_Pin = COL1 | COL2; GPIO.GPIO_Speed = GPIO_Speed_50MHz; GPIO.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOA, &GPIO); GPIO.GPIO_Pin = COL3; GPIO_Init(GPIOC, &GPIO); GPIO.GPIO_Pin = COL4; GPIO_Init(GPIOB, &GPIO); //BIT_ADDR(GPIOA_IDR_Addr,n) BIT_ADDR(GPIOA_ODR_Addr,4) = 0; BIT_ADDR(GPIOA_ODR_Addr,6) = 0; BIT_ADDR(GPIOC_ODR_Addr,4) = 0; BIT_ADDR(GPIOB_ODR_Addr,0) = 0; break; case Row: GPIO.GPIO_Pin = ROW1 | ROW2; GPIO.GPIO_Speed = GPIO_Speed_50MHz; GPIO.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOC, &GPIO); GPIO.GPIO_Pin = ROW3 | ROW4; GPIO_Init(GPIOA, &GPIO); //==============================================// GPIO.GPIO_Pin = COL1 | COL2; GPIO.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init(GPIOA, &GPIO); GPIO.GPIO_Pin = COL3; GPIO_Init(GPIOC, &GPIO); GPIO.GPIO_Pin = COL4; GPIO_Init(GPIOB, &GPIO); BIT_ADDR(GPIOC_ODR_Addr,0) = 0; BIT_ADDR(GPIOC_ODR_Addr,2) = 0; BIT_ADDR(GPIOA_ODR_Addr,0) = 0; BIT_ADDR(GPIOA_ODR_Addr,2) = 0; break; } } /************************************/ /*return 1 to 16 */ /*erturn 0 is error or not respnose */ /************************************/ uint8_t GetMatrixKeyValue(void) { uint8_t value = 0; MatrixModeConfig(Column); if (BIT_ADDR(GPIOC_IDR_Addr,0) == 0) { DelayMs(5); if (BIT_ADDR(GPIOC_IDR_Addr,0) == 0) { value += 0; } } else if (BIT_ADDR(GPIOC_IDR_Addr,2) == 0) { DelayMs(5); if (BIT_ADDR(GPIOC_IDR_Addr,2) == 0) { value += 4; } } else if (BIT_ADDR(GPIOA_IDR_Addr,0) == 0) { DelayMs(5); if (BIT_ADDR(GPIOA_IDR_Addr,0) == 0) { value += 8; } } else if (BIT_ADDR(GPIOA_IDR_Addr,2) == 0) { DelayMs(5); if (BIT_ADDR(GPIOA_IDR_Addr,2) == 0) { value += 12; } } else { value = 0; } MatrixModeConfig(Row); if (BIT_ADDR(GPIOA_IDR_Addr,4) == 0) { DelayMs(5); if (BIT_ADDR(GPIOA_IDR_Addr,4) == 0) { value += 1; } } else if (BIT_ADDR(GPIOA_IDR_Addr,6) == 0) { DelayMs(5); if (BIT_ADDR(GPIOA_IDR_Addr,6) == 0) { value += 2; } } else if (BIT_ADDR(GPIOC_IDR_Addr,4) == 0) { DelayMs(5); if (BIT_ADDR(GPIOC_IDR_Addr,4) == 0) { value += 3; } } else if (BIT_ADDR(GPIOB_IDR_Addr,0) == 0) { DelayMs(5); if (BIT_ADDR(GPIOB_IDR_Addr,0) == 0) { value += 4; } } else { value = 0; } return value; }

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