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/**
******************************************************************************
* @file Display/LTDC_Paint/Src/ts_calibration.c
* @author MCD Application Team
* @brief This application 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_Applications
* @{
*/
/** @addtogroup LTDC_Paint
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static TS_StateTypeDef TS_State;
static int16_t A1, A2, B1, B2;
static int16_t aPhysX[2], aPhysY[2], aLogX[2], aLogY[2];
static uint8_t Calibration_Done = 0;
/* Private function prototypes -----------------------------------------------*/
static void TouchscreenCalibration_SetHint(void);
static void GetPhysValues(int16_t LogX, int16_t LogY, int16_t * pPhysX, int16_t * pPhysY);
static void WaitForPressedState(uint8_t Pressed);
uint8_t IsCalibrationDone(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Performs the TS calibration
* @param None
* @retval None
*/
void Touchscreen_Calibration(void)
{
uint8_t status = 0;
uint8_t i = 0;
TouchscreenCalibration_SetHint();
status = BSP_TS_Init(BSP_LCD_GetXSize(), BSP_LCD_GetYSize());
if (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 initialized", CENTER_MODE);
}
while (1)
{
if (status == TS_OK)
{
aLogX[0] = 15;
aLogY[0] = 15;
aLogX[1] = BSP_LCD_GetXSize() - 15;
aLogY[1] = BSP_LCD_GetYSize() - 15;
for (i = 0; i < 2; i++)
{
GetPhysValues(aLogX[i], aLogY[i], &aPhysX[i], &aPhysY[i]);
}
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];
Calibration_Done = 1;
return;
}
HAL_Delay(5);
}
}
/**
* @brief Displays 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 *)"Press on the black circles", CENTER_MODE);
}
/**
* @brief Gets 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 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, 5);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_FillCircle(LogX, LogY, 2);
/* Wait until touch is pressed */
WaitForPressedState(1);
BSP_TS_GetState(&TS_State);
*pPhysX = TS_State.x;
*pPhysY = TS_State.y;
/* Wait until touch is released */
WaitForPressedState(0);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_FillCircle(LogX, LogY, 5);
}
/**
* @brief Wait for touch detected.
* @param Pressed: Touch pressed
* @retval None
*/
static void WaitForPressedState(uint8_t Pressed)
{
TS_StateTypeDef State;
do
{
BSP_TS_GetState(&State);
HAL_Delay(10);
if (State.TouchDetected == Pressed)
{
uint16_t TimeStart = HAL_GetTick();
do {
BSP_TS_GetState(&State);
HAL_Delay(40);
if (State.TouchDetected != Pressed)
{
break;
} else if ((HAL_GetTick() - 100) > TimeStart)
{
return;
}
} while (1);
}
} while (1);
}
/**
* @brief Calibrates X position.
* @param x: X position
* @retval Calibrated x
*/
uint16_t Calibration_GetX(uint16_t x)
{
return (((A1 * x) + B1)/1000);
}
/**
* @brief Calibrates Y position.
* @param y: Y position
* @retval Calibrated y
*/
uint16_t Calibration_GetY(uint16_t y)
{
return (((A2 * y) + B2)/1000);
}
/**
* @brief Checks if the TS is calibrated.
* @param None
* @retval Calibration state (1: Calibrated / 0: Not)
*/
uint8_t IsCalibrationDone(void)
{
return (Calibration_Done);
}
/**
* @}
*/
/**
* @}
*/
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