STM32F051 触摸按键功能

来源：互联网发布：软件结构图 visio 编辑：程序博客网时间：2024/05/06 12:31

搞了几天STM32F051的触摸按键功能，最后发现其实很简单。最开始下载了官方的库，结果使用的时候发现程序居然会跑飞，后来还是自己写吧，写完了才发现原来很简单，这里把代码贴出来和大家分享。

// --------------------TSCtrl.h---------------------------#pragma onceenum TSCStatus{TSC_RELEASE,TSC_PRESSED};class TSCtrl{public:    // 构造对象。    static TSCtrl &Construction(void)    {        static TSCtrl ts_obj;        return ts_obj;    }// 扫描端口。void Scan(void);// 获取状态。TSCStatus GetPortStatus(int index);~TSCtrl();private:TSCtrl();};#define tsc (TSCtrl::Construction())

//-----------------------TSCtrl.cpp-----------------------------#include "TSCtrl.h"#include "stm32f0xx_gpio.h"#include "stm32f0xx_rcc.h"#include <stdlib.h>#define THRESHOLD 30       // 按下时刻的门槛，根据实际情况修改此值。#define PORT_NR 3struct PortStatus{short fixed_value;short current_value;TSCStatus status;unsigned short enable_mask;};struct ScanTrace{PortStatus port[PORT_NR];char port_index;};ScanTrace _trace ={935, 0, TSC_RELEASE, 1 << 12,     // 935根据你的板卡而定，它是指在没有触碰按钮时刻采集的数据，该值在IOGXCR寄存器中。926, 0, TSC_RELEASE, 1 << 13,     // 1<<13这些数据也要根据实际情况修改，这里使用的是GP4_IO1， GP4_IO2，GP4_IO4。1100, 0, TSC_RELEASE, 1 << 15,0};#define CAP_PORT         GPIOA                        // 根据实际情况修改。#define SAMPCAP_PIN      GPIO_Pin_11#define CHANNEL0_PIN     GPIO_Pin_9#define CHANNEL1_PIN     GPIO_Pin_10#define CHANNEL2_PIN     GPIO_Pin_12static void _init_hw(void){// 打开时钟。::RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);GPIO_InitTypeDef gpio_config;gpio_config.GPIO_Mode = GPIO_Mode_AF;gpio_config.GPIO_OType = GPIO_OType_OD;gpio_config.GPIO_Speed = GPIO_Speed_2MHz;gpio_config.GPIO_PuPd = GPIO_PuPd_NOPULL;gpio_config.GPIO_Pin = SAMPCAP_PIN;::GPIO_Init(CAP_PORT, &gpio_config);          // 初始化CAP引脚。gpio_config.GPIO_OType = GPIO_OType_PP;gpio_config.GPIO_Pin = CHANNEL0_PIN | CHANNEL1_PIN | CHANNEL2_PIN;::GPIO_Init(CAP_PORT, &gpio_config);          // 初始化CHANNEL引脚。// 重定义引脚的功能。::GPIO_PinAFConfig(CAP_PORT, 9, GPIO_AF_3);::GPIO_PinAFConfig(CAP_PORT, 10, GPIO_AF_3);::GPIO_PinAFConfig(CAP_PORT, 11, GPIO_AF_3);::GPIO_PinAFConfig(CAP_PORT, 12, GPIO_AF_3);::RCC_AHBPeriphClockCmd(RCC_AHBPeriph_TS, ENABLE);// CTPH = 1x tPGCLK, CTPL = 1x tPGCLK, PGPSC = 5(fHCLK/32), MCV = 6, TSCE = ENABLETSC->CR = (0 << 28) | (0 << 24) | (5 << 12) | (6 << 5) | (1 << 0);// 关闭施密特出发。unsigned tmp_value = 0xFFFFFFFF;tmp_value &= (unsigned)~((unsigned)1 << 12);tmp_value &= (unsigned)~((unsigned)1 << 13);tmp_value &= (unsigned)~((unsigned)1 << 14);tmp_value &= (unsigned)~((unsigned)1 << 15);TSC->IOHCR &= tmp_value;// Sampling enabledtmp_value = 0;tmp_value |= (unsigned)((unsigned)1 << 14);TSC->IOSCR |= tmp_value;// Channel enabled, G4_IO4 G4_IO2 G4_IO1// TSC->IOCCR = (0x01 << 12);// Enable group, G4TSC->IOGCSR |= (1 << 3);}static int _wait_eoc(void){    int ret = 0;    if (TSC->ISR & 0x01)    {        // Check MCEF flag        if (TSC->ISR & 0x02)        {            ret = 0;        }        else        {            ret = 1;        }    }    return ret;}static void _scan_channel(int index){TSC->IOCCR = _trace.port[index].enable_mask;TSC->ICR |= 0x03;TSC->CR |= 0x02;int delay_cnt = 0;while(_wait_eoc() == 0){if(++delay_cnt > 10000)         // 避免死循环。{_trace.port[index].status = TSC_RELEASE;return;}}_trace.port[index].current_value = TSC->IOGXCR[3];short diff = ::abs(_trace.port[index].current_value - _trace.port[index].fixed_value);if(diff > THRESHOLD){_trace.port[index].status = TSC_PRESSED;}else{_trace.port[index].status = TSC_RELEASE;}}void TSCtrl::Scan(void){_scan_channel(_trace.port_index++);_trace.port_index = (_trace.port_index >= PORT_NR) ? 0 : _trace.port_index;}TSCStatus TSCtrl::GetPortStatus(int index){return _trace.port[index].status;}TSCtrl::TSCtrl(){_init_hw();}TSCtrl::~TSCtrl(){}

使用代码如下：

int main(void){TSCStatus t;while(1){tsc.Scan();t = tsc.GetPortStatus(1);t = tsc.GetPortStatus(2);t = tsc.GetPortStatus(3);        }}

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