STM32开发板电容触摸屏驱动，单点有效 -

STM32开发板电容触摸屏驱动，单点有效

本文引用地址: http://www.21ic.com/app/mcu/201807/765677.htm

头文件touch.h：

u8 ft5x0x_read_data(void);

void ft5x0x_i2c_init(void);

struct _ts_event

{

u16 x1;

u16 y1;

u16 x2;

u16 y2;

u16 x3;

u16 y3;

u16 x4;

u16 y4;

u16 x5;

u16 y5;

u8 touch_point;

};

extern struct _ts_event ts_event;

源文件cap_touch.c

#include

#include "lcd.h"

#include "delay.h"

#include "stdlib.h"

#include "gui.h"

#include "myiic.h"

#include "touch.h"

struct _ts_event ts_event;

u8 ft5x0x_i2c_txdata(u8 *txdata, u8 length)

{

u8 ret =0;

int i;

IIC_Start();

//发送写命令

IIC_Send_Byte(0x74);

IIC_Wait_Ack();

//开始发送数据

for(i=0;i

{

IIC_Send_Byte(txdata[i]);//发送数据

IIC_Wait_Ack();

}

IIC_Stop();//产生一个停止条件

delay_ms(10);

return ret;

}

u8 ft5x0x_i2c_rxdata(u8 *rxdata, u8 length)

{

u8 ret;

u8 *rxdatatmp = rxdata;

IIC_Start();

//发送读命令

IIC_Send_Byte(0x75);

IIC_Wait_Ack();

// IIC_Start();

//进入接收模式

for(ret=0;ret

{

rxdatatmp[ret]=IIC_Read_Byte(1);

}

IIC_Stop();//产生一个停止条件

return ret;

}

u8 ft5x0x_read_data(void)

{

u8 buf[32] = {0};

u8 ret = 0;

#ifdef CONFIG_FT5X0X_MULTITOUCH

ret = ft5x0x_i2c_rxdata(buf, 26);

#else

ret = ft5x0x_i2c_rxdata(buf, 7);

#endif

/*

for(i=0;i<7;i++)

{

printf("buf[%d]=%drn",i,buf[i]);

}

*/

ts_event.touch_point = buf[2] & 0xf;// 000 0111

if (ts_event.touch_point == 0) {

return 0;

}

#ifdef CONFIG_FT5X0X_MULTITOUCH

switch (ts_event.touch_point) {

case 5:

ts_event.x5 = (s16)(buf[0x1b] & 0x0F)<<8 | (s16)buf[0x1c];

ts_event.y5 = (s16)(buf[0x1d] & 0x0F)<<8 | (s16)buf[0x1e];

case 4:

ts_event.x4 = (s16)(buf[0x15] & 0x0F)<<8 | (s16)buf[0x16];

ts_event.y4 = (s16)(buf[0x17] & 0x0F)<<8 | (s16)buf[0x18];

case 3:

ts_event.x3 = (s16)(buf[0x0f] & 0x0F)<<8 | (s16)buf[0x10];

ts_event.y3 = (s16)(buf[0x11] & 0x0F)<<8 | (s16)buf[0x12];

case 2:

ts_event.x2 = (s16)(buf[9] & 0x0F)<<8 | (s16)buf[10];

ts_event.y2 = (s16)(buf[11] & 0x0F)<<8 | (s16)buf[12];

case 1:

ts_event.x1 = (s16)(buf[3] & 0x0F)<<8 | (s16)buf[4];

ts_event.y1 = (s16)(buf[5] & 0x0F)<<8 | (s16)buf[6];

break;

default:

return 0;

}

#else

if (ts_event.touch_point == 1)

{

//读出的数据位480*800

ts_event.x1 = (s16)(buf[3] & 0x0F)<<8 | (s16)buf[4];

ts_event.y1 = (s16)(buf[5] & 0x0F)<<8 | (s16)buf[6];

//转换成320*480

ts_event.x1 = ts_event.x1*320/480;

ts_event.y1 = ts_event.y1*480/800;

ret = 1;

}

else

{

ts_event.x1 = 0xFFFF;

ts_event.y1 = 0xFFFF;

ret = 0;

}

#endif

if (ts_event.touch_point == 1)

printf("%d (%d, %d)rn", ts_event.touch_point, ts_event.x1, ts_event.y1);

return ret;

}

void ft5x0x_i2c_reset(void)

{

GPIOE->ODR&=~(1<<4); //PE.4输出高

delay_ms(6); //手册上说至少要5ms复位时间

GPIOE->ODR|=1<<4; //PE.4输出高

}

void ft5x0x_i2c_init(void)

{

GPIOE->CRL&=0XFFF0FFFF;

GPIOE->CRL|=0X00030000;//PE.4推挽输出

GPIOE->ODR|=1<<4; //PE.4输出高

IIC_Init();

delay_ms(1);

ft5x0x_i2c_reset();

ts_event.x1 = 0xFFFF;

ts_event.y1 = 0xFFFF;

}