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/**
******************************************************************************
* @file k_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 */
#define CALIB_RES(val,pte1,ptm1,pte2,ptm2) ((((val-ptm2)*(pte1-pte2))/(ptm1-ptm2))+pte2)
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Constant related to Flash memory area used to stored the calibration
parameters. These values must be aligned with the scatter file. */
#define CALIBRATION_PARAM_FLASH_BANK FLASH_BANK_1
#define CALIBRATION_PARAM_FLASH_SECTOR FLASH_SECTOR_15
#define CALIBRATION_PARAM_FLASH_NB_SECTOR 1
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static uint8_t ts_calibration_done = 0;
static int16_t aPhysX[2], aPhysY[2], aLogX[2], aLogY[2];
typedef union
{
struct
{
uint32_t A1 : 15;
uint32_t B1 : 16;
uint32_t Reserved : 1;
}b;
uint32_t d32;
}CALIBRATION_Data1Typedef;
typedef union
{
struct
{
uint32_t A2 : 15;
uint32_t B2 : 16;
uint32_t IsCalibrated : 1;
}b;
uint32_t d32;
}CALIBRATION_Data2Typedef;
CALIBRATION_Data1Typedef data1;
CALIBRATION_Data2Typedef data2;
int16_t A1, A2, B1, B2, C1, C2, D1, D2;
/* Start calibration_data region definition to map calibration_data[] array:
calibration_data[] stores the calibration parameters in Flash memory */
#if defined(__ICCARM__)
#pragma section =".calibration_data"
#pragma default_variable_attributes = @ ".calibration_data"
uint32_t calibration_data[3*2];
/* Stop placing data in section calibration_data region */
#pragma default_variable_attributes =
#endif
#if defined(__GNUC__)
uint32_t __attribute__((section(".calibration_data"))) calibration_data[3*2];
#endif
#if defined(__CC_ARM)
uint32_t calibration_data[3*2] __attribute__((section(".calibration_data"),zero_init));
#endif
/* Three 64-bit long words used to store 3 32-bit long parameters
calibration_data[0] = 0 / 1 : very first calibration: done no / yes
calibration_data[2] = data1.d32 calibration parameter
calibration_data[4] = data2.d32 calibration parameter */
#if defined(__ICCARM__)
/* Stop placing data in section calibration_data region */
#pragma default_variable_attributes =
#endif
uint32_t Flash_error = 0;
/* Variables used for Flash erase procedure */
static FLASH_EraseInitTypeDef EraseInitStruct;
static uint32_t PAGEError = 0;
/* Flag to indicate user-requested TouchScreen calibration at start-up */
extern uint32_t UserButton_press;
/* 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, TS_StateTypeDef * TS_State);
/* 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;
uint8_t ts_Orientation;
uint16_t ts_SizeX;
uint16_t ts_SizeY;
ts_Orientation = TS_ORIENTATION_LANDSCAPE_ROT180;
ts_SizeX = BSP_LCD_GetXSize();
ts_SizeY = BSP_LCD_GetYSize();
data1.d32 = k_BkupRestoreParameter(RTC_BKP_DR0);
data2.d32 = k_BkupRestoreParameter(RTC_BKP_DR1);
/* Start touchscreen internal calibration and configuration + start */
ts_status = BSP_TS_InitEx(ts_SizeX, ts_SizeY, ts_Orientation);
if ((calibration_data[0] != 1) /* Very first start-up and calibration */
|| (UserButton_press == 1)) /* User-requested calibration */
{
TouchscreenCalibration_SetHint();
if (ts_status != TS_OK)
{
BSP_LCD_SetBackColor(LCD_COLOR_WHITE);
BSP_LCD_SetTextColor(LCD_COLOR_RED);
BSP_LCD_DisplayStringAt(0, 240 - 95, (uint8_t *)"ERROR", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 240 - 80, (uint8_t *)"Touchscreen cannot be calibrated", CENTER_MODE);
if(ts_status == TS_ERROR)
{
BSP_LCD_DisplayStringAt(0, 240 - 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
{
/* Get touch points for SW calibration processing */
aLogX[0] = 20;
aLogY[0] = 20;
aLogX[1] = BSP_LCD_GetXSize() - 20;
aLogY[1] = BSP_LCD_GetYSize() - 20;
for (i = 0; i < 2; i++)
{
TouchScreen_Calibration_GetPhysValues(aLogX[i], aLogY[i], &aPhysX[i], &aPhysY[i]);
if(i == 1)
{
if((aPhysX[0] <= (aPhysX[1] + 100)) && (aPhysY[1] <= (aPhysY[0] + 100)))
{
i = 0;
}
}
}
data1.b.A1 = aPhysX[0];
data1.b.B1 = aPhysX[1];
k_BkupSaveParameter(RTC_BKP_DR0, data1.d32);
data2.b.A2 = aPhysY[0];
data2.b.B2 = aPhysY[1];
data2.b.IsCalibrated = 1;
k_BkupSaveParameter(RTC_BKP_DR1, data2.d32);
/* Save calibration parameters in Flash */
HAL_FLASH_Unlock();
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |\
FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR| FLASH_FLAG_PGSERR);
/* First, erase Flash to be able to write afterwards */
/* Fill EraseInit structure*/
EraseInitStruct.TypeErase = FLASH_TYPEERASE_SECTORS;
EraseInitStruct.VoltageRange = FLASH_VOLTAGE_RANGE_3;
EraseInitStruct.Banks = CALIBRATION_PARAM_FLASH_BANK;
EraseInitStruct.Sector = CALIBRATION_PARAM_FLASH_SECTOR;
EraseInitStruct.NbSectors = CALIBRATION_PARAM_FLASH_NB_SECTOR;
if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK)
{
Flash_error = HAL_FLASH_GetError();
BSP_LCD_DisplayStringAt(0, 240 - 65, (uint8_t *)"Calibration parameters erasing error", CENTER_MODE);
}
/* Save calibration 'done' information */
if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, (uint32_t)&calibration_data, (uint32_t) 1) != HAL_OK)
{
Flash_error = HAL_FLASH_GetError();
BSP_LCD_DisplayStringAt(0, 240 - 65, (uint8_t *)"Calibration parameters saving error", CENTER_MODE);
}
/* Save data1.d32 calibration parameter */
if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, (uint32_t)&calibration_data[2], (uint32_t) (data1.d32)) != HAL_OK)
{
Flash_error = HAL_FLASH_GetError();
BSP_LCD_DisplayStringAt(0, 240 - 65, (uint8_t *)"Calibration parameters saving error", CENTER_MODE);
}
/* Save data2.d32 calibration parameter */
if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, (uint32_t)&calibration_data[4], (uint32_t) (data2.d32)) != HAL_OK)
{
Flash_error = HAL_FLASH_GetError();
BSP_LCD_DisplayStringAt(0, 240 - 65, (uint8_t *)"Calibration parameters saving error", CENTER_MODE);
}
}
data1.d32 = calibration_data[2];
data2.d32 = calibration_data[4];
}
else
{
/* Retrieve calibration parameters from Flash memory */
data1.d32 = calibration_data[2];
data2.d32 = calibration_data[4];
}
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(&Font20);
BSP_LCD_DisplayStringAt(0, 100, (uint8_t *)"Touchscreen", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 120, (uint8_t *)"Calibration", 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)
{
TS_StateTypeDef TS_State = {0};
/* 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, &TS_State);
/* 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, &TS_State);
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, TS_StateTypeDef * TS_State)
{
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(100);
} /* 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(100);
}
}
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)
{
int32_t ret=(CALIB_RES(x,20,data1.b.A1,220,data1.b.B1));
if (ret<0) ret=0;
else if (ret>240) ret=239;
return ret;
}
/**
* @brief Calibrate Y position
* @param y : Y position
* @retval calibrated y
*/
uint16_t TouchScreen_Get_Calibrated_Y(uint16_t y)
{
int32_t ret=(CALIB_RES(y,20,data2.b.A2,220,data2.b.B2));
if (ret<0) ret=0;
else if (ret>240) ret=239;
return ret;
}
/**check if the TS is calibrated
* @param None
* @retval calibration state (1 : calibrated / 0: no)
*/
uint8_t TouchScreen_IsCalibrationDone(void)
{
return (ts_calibration_done);
}
/**
* @}
*/
/**
* @}
*/
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