ads7846

/*********************************************************************
*                SEGGER Microcontroller GmbH & Co. KG                *
*        Solutions for real time microcontroller applications        *
**********************************************************************
*                                                                    *
*        (c) 1996 - 2012  SEGGER Microcontroller GmbH & Co. KG       *
*                                                                    *
*        Internet: www.segger.com    Support:  support@segger.com    *
*                                                                    *
**********************************************************************

** emWin V5.12 - Graphical user interface for embedded applications **
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 a license and should not be re-
distributed in any way. We appreciate your understanding and fairness.
----------------------------------------------------------------------
File        : TouchConf.c
Purpose     : Touch screen hardware access routines and driver
              configuration for Texas Instruments ADS7846 touch
              screen controller.
---------------------------END-OF-HEADER------------------------------
*/

//#include "RTOS.h"
#include "GUI.h"
#include "main.h"
#include "GUI_Type.h"
#include "GUITDRV_ADS7846.h"
#include "usart.h";
#include <string.h>

/*********************************************************************
*
*       Macros
*
**********************************************************************
*/

// #define DEBUG_TOUCH

s[30];

#define S_DELAY() {for (int i=0; i < 3000; i++){ \
  asm( \
"mov     r0, r0\n\t"\
"mov     r0, r0\n\t"\
"mov     r0, r0"\
);}};

#define CLK_SET()     {S_DELAY(); HAL_GPIO_WritePin(T_SCK_GPIO_Port, T_SCK_Pin, GPIO_PIN_SET);}
#define CLK_CLR()     {S_DELAY(); HAL_GPIO_WritePin(T_SCK_GPIO_Port, T_SCK_Pin, GPIO_PIN_RESET);}

//#define CLK_SET()     {HAL_Delay(1); HAL_GPIO_WritePin(T_SCK_GPIO_Port, T_SCK_Pin, GPIO_PIN_SET);}
//#define CLK_CLR()     {HAL_Delay(1); HAL_GPIO_WritePin(T_SCK_GPIO_Port, T_SCK_Pin, GPIO_PIN_RESET);}

#define CS_SET()      HAL_GPIO_WritePin(T_CS_GPIO_Port, T_CS_Pin, GPIO_PIN_RESET)
#define CS_CLR()      HAL_GPIO_WritePin(T_CS_GPIO_Port, T_CS_Pin, GPIO_PIN_SET)
#define DO_SET()      HAL_GPIO_WritePin(T_MOSI_GPIO_Port, T_MOSI_Pin, GPIO_PIN_SET)
#define DO_CLR()      HAL_GPIO_WritePin(T_MOSI_GPIO_Port, T_MOSI_Pin, GPIO_PIN_RESET)
#define DI_VAL()      HAL_GPIO_ReadPin(T_MISO_GPIO_Port, T_MISO_Pin)
#define BUSY_VAL()    (0)
#define PENIRQ_VAL()  HAL_GPIO_ReadPin(T_PEN_GPIO_Port, T_PEN_Pin)

/*********************************************************************
*
*       Local functions
*
**********************************************************************
*/

/*********************************************************************
*
*       _SendCmd
*
* Purpose:
*   Write 8 bit command to peripheral.
*/
void _SendCmd(U8 Data) {
  int i;

/*  sprintf(s, "CMD: %2x\r\n", Data);
  HAL_UART_Transmit(&huart1, (uint8_t*)s, strlen(s), 20);
*/
  for (i = 0; i < 8; i++) {
    //
    // Output next bit
    //
    if (Data & (1 << 7)) {
      DO_SET();
    } else {
      DO_CLR();
    }
    //
    // Output one clock and prepare next bit
    //
    CLK_SET();
    CLK_CLR();
    Data <<= 1;
  }
}

/*********************************************************************
*
*       _GetResult
*
* Purpose:
*   Read 16 bit result from peripheral.
*
* Return value:
*   16 bit AD value.
*/
U16 _GetResult(void) {
  U16 r;
  int i;
  U8  v;

  for (i = 0; i < 16; i++) {
    r <<= 1;
    if (DI_VAL()) {
      r |= 1;
    }
    CLK_SET();
    CLK_CLR();
  }

  r >>= 4;  // Remove padding bytes

#ifdef DEBUG_TOUCH
  if (r)
    {
      sprintf(s, "Res: %4x\r\n", r);
      HAL_UART_Transmit(&huart1, (uint8_t*)s, strlen(s), 20);
    }
#endif
  return r;
}

/*********************************************************************
*
*       _GetBusy
*
* Purpose:
*   Checks the busy line of the peripheral.
*
* Return value:
*   0 = Peripheral ready
*   1 = Peripheral busy
*/
char _GetBusy(void) {
  //
  // Output one clock as the busy line will only get low when
  // providing a clock. After one clock the output data is ready
  // thus needing one clock less in the _GetResult() routine. The
  // _GetResult() routine can output more clocks than necessary as
  // they are ignored.
  //
  CLK_SET();
  CLK_CLR();
  //
  // Check busy line just to be sure that the peripheral is ready and data
  // has been already shifted out with the last clock.
  //
  //if (BUSY_VAL()) {
  //  return 1;
  //}
  return 0;
}

/*********************************************************************
*
*       _GetPENIRQ
*
* Purpose:
*   Checks the PENIRQ line of the peripheral for a touch event.
*
* Return value:
*   0 = No touch event
*   1 = Touch can be sampled
*/
char _GetPENIRQ(void) {
  if (PENIRQ_VAL()) {
   return 0;
  }
  else
  {
      return 1;
  }
}

/*********************************************************************
*
*       _SetCS
*
* Purpose:
*   Sets the chip select line of the peripheral.
*/
void _SetCS(char OnOff) {
  if (OnOff) {
    CS_SET();
  } else {
    CS_CLR();
  }
}

/*********************************************************************
*
*       Public functions
*
**********************************************************************
*/
/*********************************************************************
*
*       TOUCH_X_Init
*
* Purpose:
*   Fill in the touch API routines and initalize the touch screen driver.
*/
void TOUCH_X_Init(void);
void TOUCH_X_Init(void) {

  GUITDRV_ADS7846_CONFIG Config = {0};

  Config.pfSendCmd   = _SendCmd;
  Config.pfGetResult = _GetResult;
  Config.pfGetBusy   = _GetBusy;
  Config.pfGetPENIRQ = _GetPENIRQ;
  Config.pfSetCS     = _SetCS;
  Config.xLog0       = 0;
  Config.xLog1       = 240;
  Config.xPhys0      = 200;
  Config.xPhys1      = 3800;
  Config.yLog0       = 0;
  Config.yLog1       = 320;
  Config.yPhys0      = 320;
  Config.yPhys1      = 3700;
  Config.Orientation = GUI_SWAP_XY;
  GUITDRV_ADS7846_Config(&Config);
}

/*************************** End of file ****************************/