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/**
******************************************************************************
* @file k_calibration.c
* @author MCD Application Team
* @brief This file provides the kernel calibration functions
******************************************************************************
* @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 "k_calibration.h"
#include "k_rtc.h"
#include "GUI.h"
/** @addtogroup CORE
* @{
*/
/** @defgroup KERNEL_CALIBRATION
* @brief Kernel calibration routines
* @{
*/
/* External variables --------------------------------------------------------*/
/* Private typedef -----------------------------------------------------------*/
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;
/* Private defines -----------------------------------------------------------*/
/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
uint32_t CALIBRATION_Done = 0;
static const char * _acPos[] = {
"(upper left position)",
"(lower right position)"
};
int16_t A1, A2, B1, B2;
CALIBRATION_Data1Typedef data1;
CALIBRATION_Data2Typedef data2;
/**
* @brief wait for process state
* @param Pressed: touch status
* @retval None
*/
static void _WaitForPressedState(int Pressed) {
GUI_PID_STATE State;
do {
GUI_TOUCH_GetState(&State);
GUI_Delay(10);
if (State.Pressed == Pressed) {
int TimeStart = GUI_GetTime();
do {
GUI_TOUCH_GetState(&State);
GUI_Delay(10);
if (State.Pressed != Pressed) {
break;
} else if ((GUI_GetTime() - 150) > TimeStart) {
return;
}
} while (1);
}
} while (1);
}
/**
* @brief Shows the given text horizontally and vertically centered
* @param pString: pointer to the text
* @retval None
*/
static void _DispStringCentered(const char * pString) {
GUI_RECT Rect;
Rect.x0 = Rect.y0 = 0;
Rect.x1 = LCD_GetXSize() - 1;
Rect.y1 = LCD_GetYSize() - 1;
GUI_DispStringInRect(pString, &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER);
}
/**
* @brief Asks the user to press the touch screen at the given position
* and returns the physical A/D values
* @param LogX: logical X position
* @param LogY: logical Y position
* @param pPhysX: Physical X position
* @param pPhysY: Physical Y position
* @param pString: pointer to string
* @retval None
*/
static void _GetPhysValues(int LogX, int LogY, int * pPhysX, int * pPhysY, const char * pString) {
char acText[] = "Press here";
GUI_RECT Rect;
GUI_PID_STATE State;
int FontSizeY, Align;
FontSizeY = GUI_GetFontSizeY();
GUI_Clear();
GUI_SetColor(GUI_BLACK);
_DispStringCentered("Runtime calibration,\n"
"please touch the screen\n"
"at the center of the ring."); /* Ask user to press the touch */
/* Calculate the rectangle for the string */
Rect.y0 = LogY - FontSizeY;
Rect.y1 = LogY + FontSizeY;
if (LogX < LCD_GetXSize() / 2) {
Rect.x0 = LogX + 15;
Rect.x1 = LCD_GetXSize();
Align = GUI_TA_LEFT;
} else {
Rect.x0 = 0;
Rect.x1 = LogX - 15;
Align = GUI_TA_RIGHT;
}
/* Show the text nearby the ring */
GUI_DispStringInRect(acText, &Rect, Align | GUI_TA_TOP);
GUI_DispStringInRect(pString, &Rect, Align | GUI_TA_BOTTOM);
/* Draw the ring */
GUI_FillCircle(LogX, LogY, 5);
GUI_SetColor(GUI_WHITE);
GUI_FillCircle(LogX, LogY, 2);
GUI_SetColor(GUI_BLACK);
/* Wait until touch is pressed */
_WaitForPressedState(1);
GUI_TOUCH_GetState(&State);
*pPhysX = State.x;
*pPhysY = State.y;
/* Wait until touch is released */
_WaitForPressedState(0);
}
/**
* @brief Shows text to give short explanation of the sample program
* @param None.
* @retval None
*/
static void _Explain(void) {
_DispStringCentered("At first time, you need to\n"
"calibrate the Touch screen\n"
"Please press the touch\n"
"screen to continue...");
GUI_DispStringHCenterAt("Touch screen Calibration", LCD_GetXSize() / 2, 5);
_WaitForPressedState(1);
_WaitForPressedState(0);
}
/**
* @brief Initialization of calibration
* @param None.
* @retval None
*/
void k_CalibrationInit(void)
{
int aPhysX[2], aPhysY[2], aLogX[2], aLogY[2], i;
data1.d32 = k_BkupRestoreParameter(RTC_BKP_DR0);
data2.d32 = k_BkupRestoreParameter(RTC_BKP_DR1);
A2 = data2.b.A2;
B2 = data2.b.B2;
A1 = data1.b.A1;
B1 = data1.b.B1;
if(data2.b.IsCalibrated == 0)
{
GUI_SetBkColor(GUI_WHITE);
GUI_Clear();
GUI_SetColor(GUI_BLACK);
GUI_SetFont(&GUI_Font13B_ASCII);
_Explain();
/* Set the logical values */
aLogX[0] = 15;
aLogY[0] = 15;
aLogX[1] = LCD_GetXSize() - 15;
aLogY[1] = LCD_GetYSize() - 15;
/* Get the physical values of the AD converter for 2 positions */
for (i = 0; i < 2; i++) {
_GetPhysValues(aLogX[i], aLogY[i], &aPhysX[i], &aPhysY[i], _acPos[i]);
}
/* Use the physical values to calibrate the touch screen */
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];
data1.b.A1 = A1;
data1.b.B1 = B1;
k_BkupSaveParameter(RTC_BKP_DR0, data1.d32);
data2.b.A2 = A2;
data2.b.B2 = B2;
data2.b.IsCalibrated = 1;
k_BkupSaveParameter(RTC_BKP_DR1, data2.d32);
/* Display the result */
GUI_Clear();
_DispStringCentered("Touch screen has been\n"
"calibrated. Please use\n"
"the cursor to test\n"
"the calibration...");
}
CALIBRATION_Done = 1;
GUI_Delay(1000);
}
uint8_t k_CalibrationIsDone(void)
{
return CALIBRATION_Done;
}
uint16_t k_CalibrationGetX(uint16_t x)
{
return (((A1 * x) + B1)/1000);
}
uint16_t k_CalibrationGetY(uint16_t y)
{
return (((A2 * y) + B2)/1000);
}
/**
* @}
*/
/**
* @}
*/