STM32开发板电容触摸屏驱动，单点有效
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 <stm32f10x_map.h>
#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<length;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<length;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]=%d\r\n",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)\r\n", 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;
}