STM32F746-Disco开发板的液晶屏是一个电容触摸屏,灵敏度很高,它支持多点触摸。
这个触摸屏的使用也很方便,在Mbed中,已经为我们定义好了触摸屏类TS_DISCO_F746NG。使用方法是:
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先包含头文件,
#include "TS_DISCO_F746NG.h"
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然后定义触摸屏
TS_DISCO_F746NG ts;
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定义触摸屏状态变量
TS_StateTypeDef TS_State;
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初始化触摸屏
ts.Init
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获取触摸屏状态
ts.GetState(&TS_State);
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判断触摸屏是否按下
TS_State.touchDetected
这个变量同时也代表按下点的数量
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触摸位置座标
x = TS_State.touchX[idx];
y = TS_State.touchY[idx];
下面代码演示了检测触摸的效果:
#include "mbed.h"
#include "TS_DISCO_F746NG.h"
#include "LCD_DISCO_F746NG.h"
LCD_DISCO_F746NG lcd;
TS_DISCO_F746NG ts;
int main()
{
TS_StateTypeDef TS_State;
uint16_t x, y;
uint8_t text[30];
uint8_t status;
uint8_t idx;
uint8_t cleared = 0;
uint8_t prev_nb_touches = 0;
lcd.DisplayStringAt(0, LINE(5), (uint8_t *)"TOUCHSCREEN DEMO", CENTER_MODE);
wait(1);
status = ts.Init(lcd.GetXSize(), lcd.GetYSize());
if (status != TS_OK) {
lcd.Clear(LCD_COLOR_RED);
lcd.SetBackColor(LCD_COLOR_RED);
lcd.SetTextColor(LCD_COLOR_WHITE);
lcd.DisplayStringAt(0, LINE(5), (uint8_t *)"TOUCHSCREEN INIT FAIL", CENTER_MODE);
} else {
lcd.Clear(LCD_COLOR_GREEN);
lcd.SetBackColor(LCD_COLOR_GREEN);
lcd.SetTextColor(LCD_COLOR_WHITE);
lcd.DisplayStringAt(0, LINE(5), (uint8_t *)"TOUCHSCREEN INIT OK", CENTER_MODE);
}
wait(1);
lcd.SetFont(&Font12);
lcd.SetBackColor(LCD_COLOR_BLUE);
lcd.SetTextColor(LCD_COLOR_WHITE);
while(1) {
ts.GetState(&TS_State);
if (TS_State.touchDetected) {
// Clear lines corresponding to old touches coordinates
if (TS_State.touchDetected < prev_nb_touches) {
for (idx = (TS_State.touchDetected + 1); idx <= 5; idx++) {
lcd.ClearStringLine(idx);
}
}
prev_nb_touches = TS_State.touchDetected;
cleared = 0;
sprintf((char*)text, "Touches: %d", TS_State.touchDetected);
lcd.DisplayStringAt(0, LINE(0), (uint8_t *)&text, LEFT_MODE);
for (idx = 0; idx < TS_State.touchDetected; idx++) {
x = TS_State.touchX[idx];
y = TS_State.touchY[idx];
sprintf((char*)text, "Touch %d: x=%d y=%d ", idx+1, x, y);
lcd.DisplayStringAt(0, LINE(idx+1), (uint8_t *)&text, LEFT_MODE);
}
lcd.DrawPixel(TS_State.touchX[0], TS_State.touchY[0], LCD_COLOR_ORANGE);
} else {
if (!cleared) {
lcd.Clear(LCD_COLOR_BLUE);
sprintf((char*)text, "Touches: 0");
lcd.DisplayStringAt(0, LINE(0), (uint8_t *)&text, LEFT_MODE);
cleared = 1;
}
}
}
}
目前发现这个程序在keil中调试有问题,不能运行,还没有找到原因,但是在Mbed compile中可以正常使用。所以暂时不提供Keil的程序,等解决后在添加。
运行效果:
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