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/*********************************************************************
* SEGGER Microcontroller GmbH & Co. KG *
* Solutions for real time microcontroller applications *
**********************************************************************
* *
* (c) 1996 - 2015 SEGGER Microcontroller GmbH & Co. KG *
* *
* Internet: www.segger.com Support: support@segger.com *
* *
**********************************************************************
** emWin V5.28 - Graphical user interface for embedded applications **
All Intellectual Property rights in the Software belongs to SEGGER.
emWin is protected by international copyright laws. Knowledge of the
source code may not be used to write a similar product. This file may
only be used in accordance with the following terms:
The software has been licensed to STMicroelectronics International
N.V. whose registered office is situated at Plan-les-Ouates, Geneva,
39 Chemin du Champ des Filles, Switzerland solely for the purposes of
creating libraries for STMicroelectronics ARM Cortex�-M-based 32-bit
microcontroller products, sublicensed and distributed by
STMicroelectronics under the terms and conditions of the End User
License Agreement supplied with the software. The use of the software
on a stand-alone basis or for any purpose other than to operate with
the specified microcontroller is prohibited and subject to a separate
license agreement.
Full source code is available at: www.segger.com
We appreciate your understanding and fairness.
----------------------------------------------------------------------
File : TOUCH_Calibrate.c
Purpose : Demonstrates how a touch screen can be calibrated at run time
---------------------------END-OF-HEADER------------------------------
*/
#include "calibration.h"
#include "rtc.h"
#include "GUI.h"
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;
uint32_t CALIBRATION_Done = 0;
/********************************************************************
*
* Static data
*
*********************************************************************
*/
static const char * _acPos[] = {
"(upper left position)",
"(lower right position)"
};
int32_t A1, A2, B1, B2;
CALIBRATION_Data1Typedef data1;
CALIBRATION_Data2Typedef data2;
/*********************************************************************
*
* Static code
*
**********************************************************************
*/
/*********************************************************************
*
* _WaitForPressedState
*
* Purpose:
* Waits until the touch is in the given pressed state for at least 250 ms
*/
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);
}
/*********************************************************************
*
* _DispStringCentered
*
* Purpose:
* Shows the given text horizontally and vertically centered
*/
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);
}
/*********************************************************************
*
* _GetPhysValues
*
* Purpose:
* Asks the user to press the touch screen at the given position
* and returns the physical A/D values
*/
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 corners of the screen\n"
"at the center of the rings."); /* Ask user to press the touch */
/* Calculate the rectangle for the string */
if (LogX < LCD_GetXSize() / 2) {
Rect.x0 = LogX + 25;
Rect.x1 = LCD_GetXSize();
Rect.y0 = LogY - FontSizeY + 5;
Rect.y1 = LogY + FontSizeY + 5;
Align = GUI_TA_LEFT;
} else {
Rect.x0 = 0;
Rect.x1 = LogX - 25;
Rect.y0 = LogY - FontSizeY - 5;
Rect.y1 = LogY + FontSizeY - 5;
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, 10);
GUI_SetColor(GUI_WHITE);
GUI_FillCircle(LogX, LogY, 7);
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);
}
/********************************************************************
*
* _Explain
*
* Purpose:
* Shows a text to give a short explanation of the sample program
*/
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);
}
/*********************************************************************
*
* Public code
*
**********************************************************************
*/
/*********************************************************************
*
* MainTask
*/
void CALIBRATION_Check(void)
{
int aPhysX[2], aPhysY[2], aLogX[2], aLogY[2], i;
data1.d32 = BACKUP_RestoreParameter(RTC_BKP_DR0);
data2.d32 = BACKUP_RestoreParameter(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_Font20B_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;
BACKUP_SaveParameter(RTC_BKP_DR0, data1.d32);
data2.b.A2 = A2;
data2.b.B2 = B2;
data2.b.IsCalibrated = 1;
BACKUP_SaveParameter(RTC_BKP_DR1, data2.d32);
/* Display the result */
GUI_CURSOR_Show();
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 CALIBRATION_IsDone(void)
{
return CALIBRATION_Done;
}
uint16_t CALIBRATION_GetX(uint16_t x)
{
return (((A1 * x) + B1)/1000);
}
uint16_t CALIBRATION_GetY(uint16_t y)
{
return (((A2 * y) + B2)/1000);
}
/*************************** End of file ****************************/