/**
* @brief Returns Status and positions of the Touch screen.
* @param None
* @retval Pointer to TS_STATE structure holding Touch Screen information.
*/
TS_STATE* IOE_TS_GetState(void)
{
uint16_t xDiff, yDiff , x , y;
static uint16_t _x = 0, _y = 0;
/* Check if the Touch detect event happened */
TS_State.TouchDetected = (I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_CTRL) & 0x80);
if(TS_State.TouchDetected)
{
x = IOE_TS_Read_X();
y = IOE_TS_Read_Y();
xDiff = x > _x? (x - _x): (_x - x);
yDiff = y > _y? (y - _y): (_y - y);
if (xDiff + yDiff > 5)
{
_x = x;
_y = y;
}
}
/* Update the X position */
TS_State.X = _x;
/* Update the Y position */
TS_State.Y = _y;
/* Update the Z position index */
TS_State.Z = IOE_TS_Read_Z();
/* Clear the interrupt pending bit and enable the FIFO again */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x01);
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x00);
/* Return pointer to the updated structure */
return &TS_State;
}
/**
* @brief Lcd_Touch Calibration test
* @param None
* @retval None
*/
void Lcd_Touch_Calibration(void)
{
#define CURSOR_LEN (10)
uint8_t k,i;
float ratio1,ratio2;
Point_Struct left_upper_point,right_upper_point,left_down_point,right_down_point,tst_point;
int tpx_sum = 0,tpy_sum = 0;
/*Indicates whether Calibration is OK*/
uint8_t adjust_OK_Falg = 0;
TS_STATE *pstate = NULL;
/* Clear the LCD */
LCD_Clear(White);
LCD_SetTextColor(Red);
delay(100);
while (!adjust_OK_Falg) {
tpx_sum = 0;
tpy_sum = 0;
/*wait for Calibration */
for (k = 0;k < 4;k++) {
LCD_DrawUniLine( point_Base[k].x - CURSOR_LEN,
point_Base[k].y,
point_Base[k].x + CURSOR_LEN,
point_Base[k].y);
LCD_DrawUniLine( point_Base[k].x,
point_Base[k].y - CURSOR_LEN,
point_Base[k].x,
point_Base[k].y + CURSOR_LEN);
do {
pstate = IOE_TS_GetState();
} while(!pstate->TouchDetected);
delay(10);
/*Read AD convert result*/
for(i = 0; i < 16; i++) {
tpx_sum += IOE_TS_Read_X();
tpy_sum += IOE_TS_Read_Y();
delay(2);
}
tpx_sum >>= 4;
tpy_sum >>= 4;
switch (k) {
case 0:
left_upper_point.x = tpx_sum;
left_upper_point.y = tpy_sum;
break;
case 1:
right_upper_point.x = tpx_sum;
right_upper_point.y = tpy_sum;
break;
case 2:
left_down_point.x = tpx_sum;
left_down_point.y = tpy_sum;
break;
case 3:
right_down_point.x = tpx_sum;
right_down_point.y = tpy_sum;
break;
default:
break;
}
delay(200);
}
ratio1 = (float)((point_Base[1].x - point_Base[0].x) + (point_Base[3].x - point_Base[2].x)) / 2.0;
ratio2 = (float)((right_upper_point.x - left_upper_point.x) + (right_down_point.x - left_down_point.x)) / 2.0;
adjust_Para.xScale = ratio1 / ratio2;
ratio1 = (float)((point_Base[2].y - point_Base[0].y) +
(point_Base[3].y - point_Base[1].y)) / 2.0;
ratio2 = (float)((left_down_point.y - left_upper_point.y) +
(right_down_point.y - right_upper_point.y)) / 2.0;
adjust_Para.yScale = ratio1 / ratio2;
ratio1 = (((float)right_upper_point.x * adjust_Para.xScale - (float)point_Base[1].x)
+ ((float)left_upper_point.x * adjust_Para.xScale - (float)point_Base[0].x)) / 2.0;
adjust_Para.xOffset = (int)ratio1;
ratio1 = (((float)right_upper_point.y * adjust_Para.yScale - (float)point_Base[1].y)
+ ((float)left_upper_point.y * adjust_Para.yScale - (float)point_Base[0].y)) / 2.0;
adjust_Para.yOffset = (int)ratio1;
/*Draw cross sign for calibration points*/
LCD_DrawUniLine(point_Base[4].x - CURSOR_LEN,
point_Base[4].y,
point_Base[4].x + CURSOR_LEN,
point_Base[4].y);
LCD_DrawUniLine(point_Base[4].x,
point_Base[4].y - CURSOR_LEN,
point_Base[4].x,
point_Base[4].y + CURSOR_LEN);
do {
pstate = IOE_TS_GetState();
} while(!pstate->TouchDetected);
delay(10);
tpx_sum = 0;
tpy_sum = 0;
/*Read AD convert result*/
for(i = 0; i < 16; i++) {
tpx_sum += IOE_TS_Read_X();
tpy_sum += IOE_TS_Read_Y();
delay(2);
}
tpx_sum >>= 4;
tpy_sum >>= 4;
tst_point.x = tpx_sum;
tst_point.y = tpy_sum;
tst_point.x = (int)(tst_point.x * adjust_Para.xScale - adjust_Para.xOffset);
tst_point.y = (int)(tst_point.y * adjust_Para.yScale - adjust_Para.yOffset);
if (tst_point.x > (point_Base[4].x + CALIBRATION_RANGE)
|| tst_point.x < (point_Base[4].x - CALIBRATION_RANGE)
|| tst_point.y > (point_Base[4].y + CALIBRATION_RANGE)
|| tst_point.y < (point_Base[4].y - CALIBRATION_RANGE)) {
adjust_OK_Falg = 0;
LCD_DisplayStringLine(LINE(8)," Calibration Fail! ");
delay(200);
LCD_Clear(White);
delay(300);
} else {
adjust_OK_Falg = 1;
}
}
LCD_DisplayStringLine(LINE(8)," Calibration OK! ");
delay(200);
}
