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/**
******************************************************************************
* @file LCD_Paint/Src/ts_calibration.c
* @author MCD Application Team
* @brief This example code shows how to calibrate the touchscreen.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_HAL_Examples
* @{
*/
/** @addtogroup BSP
* @{
*/
/* Imported variables */
extern TS_StateTypeDef TS_State;
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static uint8_t ts_calibration_done = 0;
static int16_t A1, A2, B1, B2;
static int16_t aPhysX[2], aPhysY[2], aLogX[2], aLogY[2];
/* Private function prototypes -----------------------------------------------*/
static void TouchscreenCalibration_SetHint(void);
static void TouchScreen_Calibration_GetPhysValues(int16_t LogX, int16_t LogY, int16_t * pPhysX, int16_t * pPhysY) ;
static void TouchScreen_Calibration_WaitForPressedState(uint8_t Pressed) ;
/* Private functions ---------------------------------------------------------*/
/**
* @brief Performs the TS calibration
* @param None
* @retval Status (TS_OK = 0/ TS_ERROR = 1 / TS_TIMEOUT = 1 / TS_DEVICE_NOT_FOUND = 3)
*/
uint8_t Touchscreen_Calibration(void)
{
uint8_t ts_status = TS_OK;
uint8_t i;
uint16_t ts_SizeX;
uint16_t ts_SizeY;
ts_SizeX = BSP_LCD_GetXSize();
ts_SizeY = BSP_LCD_GetYSize();
TouchscreenCalibration_SetHint();
/* Start touchscreen internal calibration and configuration + start */
ts_status = BSP_TS_Init(ts_SizeX, ts_SizeY);
if (ts_status != TS_OK)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 95, (uint8_t *)"ERROR", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 80, (uint8_t *)"Touchscreen cannot be calibrated", CENTER_MODE);
if(ts_status == TS_ERROR)
{
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)"Touchscreen undefined error", CENTER_MODE);
}
else if(ts_status == TS_TIMEOUT)
{
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)"Touchscreen Timeout", CENTER_MODE);
}
else
{
/* TS_DEVICE_NOT_FOUND */
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)"Touchscreen Not Found", CENTER_MODE);
}
}
else
{
/* status == TS_OK */
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 65, (uint8_t *)"FT6x06 internal calibration passed", CENTER_MODE);
/* Get touch points for SW calibration processing */
aLogX[0] = 40;
aLogY[0] = 40;
aLogX[1] = BSP_LCD_GetXSize() - 40;
aLogY[1] = BSP_LCD_GetYSize() - 40;
for (i = 0; i < 2; i++)
{
TouchScreen_Calibration_GetPhysValues(aLogX[i], aLogY[i], &aPhysX[i], &aPhysY[i]);
}
/* Compute calibration coefficients */
A1 = (1000 * ( aLogX[1] - aLogX[0])) / ( aPhysX[1] - aPhysX[0]);
B1 = (1000 * aLogX[0]) - A1 * aPhysX[0];
A2 = (1000 * ( aLogY[1] - aLogY[0])) / ( aPhysY[1] - aPhysY[0]);
B2 = (1000 * aLogY[0]) - A2 * aPhysY[0];
ts_calibration_done = 1;
}
return (ts_status);
}
/**
* @brief Display calibration hint
* @param None
* @retval None
*/
static void TouchscreenCalibration_SetHint(void)
{
/* Clear the LCD */
BSP_LCD_Clear(LCD_COLOR_WHITE);
/* Set Touchscreen Demo description */
BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetFont(&Font12);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() / 2 - 27, (uint8_t *)"Before using the Touchscreen", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() / 2 - 12, (uint8_t *)"you need to calibrate it.", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() / 2 + 3, (uint8_t *)"WAIT until end of internal calibration", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() / 2 + 18, (uint8_t *)"THEN Press on the black circles", CENTER_MODE);
}
/**
* @brief Get Physical position
* @param LogX : logical X position
* @param LogY : logical Y position
* @param pPhysX : Physical X position
* @param pPhysY : Physical Y position
* @retval None
*/
static void TouchScreen_Calibration_GetPhysValues(int16_t LogX, int16_t LogY, int16_t * pPhysX, int16_t * pPhysY)
{
/* Draw the ring */
BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
BSP_LCD_FillCircle(LogX, LogY, 20);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_FillCircle(LogX, LogY, 10);
/* Wait until pressed state on the touch panel */
TouchScreen_Calibration_WaitForPressedState(1);
/* Return as physical touch values the positions of first touch, even if double touched occurred */
*pPhysX = TS_State.touchX[0];
*pPhysY = TS_State.touchY[0];
/* Wait until touch is released on touch panel */
TouchScreen_Calibration_WaitForPressedState(0);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_FillCircle(LogX, LogY, 20);
}
/**
* @brief TouchScreen_Calibration_WaitForPressedState : wait until a particular press/depress action
* The function is managing anti-rebound : that is the awaited state when detected
* needs to be stable for a sufficient time (timeout time), otherwise a new sense to search
* for awaited state is performed. When awaited state is found and state is stable for timeout
* duration, the function is exited.
* @param uint8_t Pressed : Awaited pressed state
* - Await touch (single/multiple) detection if Pressed == 1
* - Await no touch detection if Pressed == 0
* @retval None
*/
static void TouchScreen_Calibration_WaitForPressedState(uint8_t Pressed)
{
uint16_t TimeStart = 0;
uint8_t status = TS_OK;
uint32_t exitFirstLevelWhileLoopReq = 0; /* By default no exit request from first level while loop */
uint32_t exitSecondLevelWhileLoopReq = 0; /* By default no exit request from second level while loop */
/* First level while loop entry */
do
{
/* reset exit second level while loop in case it was set */
exitSecondLevelWhileLoopReq = 0;
/* Sense of touch state from touch IC until get the awaited state in parameter 'Pressed' */
status = BSP_TS_GetState(&TS_State);
if(status == TS_OK)
{
if (((Pressed == 0) && (TS_State.touchDetected == 0)) ||
((Pressed == 1) && ((TS_State.touchDetected == 1) || (TS_State.touchDetected == 2))))
{
/* Got awaited press state */
/* Record in 'TimeStart' the time of awaited touch event for anti-rebound calculation */
/* The state should persist for a minimum sufficient time */
TimeStart = HAL_GetTick();
/* Is state of the touch changing ? */
/* Second level while loop entry */
do
{
/* New sense of touch state from touch IC : to evaluate if state was stable */
status = BSP_TS_GetState(&TS_State);
if(status == TS_OK)
{
/* Is there a state change compared since having found the awaited state ? */
if (((Pressed == 0) && ((TS_State.touchDetected == 1) || (TS_State.touchDetected == 2))) ||
((Pressed == 1) && ((TS_State.touchDetected == 0))))
{
/* Too rapid state change => anti-rebound management : restart first touch search */
exitSecondLevelWhileLoopReq = 1; /* exit request from second level while loop */
}
else if ((HAL_GetTick() - 100) > TimeStart)
{
/* State have not changed for the timeout duration (stable touch for 100 ms) */
/* This means the touch state is stable : can exit function */
/* found valid touch, exit both while levels */
exitSecondLevelWhileLoopReq = 1;
exitFirstLevelWhileLoopReq = 1;
}
/* Wait 10 ms before next sense of touch at next loop iteration */
HAL_Delay(10);
} /* of if(status == TS_OK) */
}
while (!exitSecondLevelWhileLoopReq);
} /* of if (((Pressed == 0) && .... */
} /* of if(status == TS_OK) */
if(!exitFirstLevelWhileLoopReq)
{
/* Wait some time before next sense of touch at next loop iteration */
HAL_Delay(10);
}
}
while (!exitSecondLevelWhileLoopReq);
}
/**
* @brief Calibrate x position (to obtain X = calibrated(x))
* @param x : X position
* @retval calibrated x
*/
uint16_t TouchScreen_Get_Calibrated_X(uint16_t x)
{
return (((A1 * x) + B1)/1000);
}
/**
* @brief Calibrate Y position
* @param y : Y position
* @retval calibrated y
*/
uint16_t TouchScreen_Get_Calibrated_Y(uint16_t y)
{
return (((A2 * y) + B2) / 1000);
}
/**check if the TS is calibrated
* @param None
* @retval calibration state (1 : calibrated / 0: no)
*/
uint8_t TouchScreen_IsCalibrationDone(void)
{
return (ts_calibration_done);
}
/**
* @}
*/
/**
* @}
*/