stm32f429i_discovery_ts.c

00001 /**
00002   ******************************************************************************
00003   * @file    stm32f429i_discovery_ts.c
00004   * @author  MCD Application Team
00005   * @brief   This file provides a set of functions needed to manage Touch 
00006   *          screen available with STMPE811 IO Expander device mounted on 
00007   *          STM32F429I-Discovery Kit.
00008   ******************************************************************************
00009   * @attention
00010   *
00011   * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
00012   *
00013   * Redistribution and use in source and binary forms, with or without modification,
00014   * are permitted provided that the following conditions are met:
00015   *   1. Redistributions of source code must retain the above copyright notice,
00016   *      this list of conditions and the following disclaimer.
00017   *   2. Redistributions in binary form must reproduce the above copyright notice,
00018   *      this list of conditions and the following disclaimer in the documentation
00019   *      and/or other materials provided with the distribution.
00020   *   3. Neither the name of STMicroelectronics nor the names of its contributors
00021   *      may be used to endorse or promote products derived from this software
00022   *      without specific prior written permission.
00023   *
00024   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00025   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00026   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00027   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00028   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00029   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00030   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00031   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00032   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00033   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00034   *
00035   ******************************************************************************
00036   */ 
00037   
00038 /* Includes ------------------------------------------------------------------*/
00039 #include "stm32f429i_discovery_ts.h"
00040 #include "stm32f429i_discovery_io.h"
00041 
00042 /** @addtogroup BSP
00043   * @{
00044   */
00045 
00046 /** @addtogroup STM32F429I_DISCOVERY
00047   * @{
00048   */ 
00049   
00050 /** @defgroup STM32F429I_DISCOVERY_TS STM32F429I DISCOVERY TS
00051   * @{
00052   */ 
00053 
00054 /** @defgroup STM32F429I_DISCOVERY_TS_Private_Types_Definitions STM32F429I DISCOVERY TS Private Types Definitions
00055   * @{
00056   */ 
00057 /**
00058   * @}
00059   */ 
00060 
00061 /** @defgroup STM32F429I_DISCOVERY_TS_Private_Defines STM32F429I DISCOVERY TS Private Defines
00062   * @{
00063   */ 
00064 /**
00065   * @}
00066   */ 
00067 
00068 /** @defgroup STM32F429I_DISCOVERY_TS_Private_Macros STM32F429I DISCOVERY TS Private Macros
00069   * @{
00070   */ 
00071 /**
00072   * @}
00073   */ 
00074 
00075 /** @defgroup STM32F429I_DISCOVERY_TS_Private_Variables STM32F429I DISCOVERY TS Private Variables
00076   * @{
00077   */
00078 static TS_DrvTypeDef     *TsDrv;
00079 static uint16_t          TsXBoundary, TsYBoundary; 
00080 /**
00081   * @}
00082   */
00083 
00084 /** @defgroup STM32F429I_DISCOVERY_TS_Private_Function_Prototypes STM32F429I DISCOVERY TS Private Function Prototypes
00085   * @{
00086   */
00087 /**
00088   * @}
00089   */
00090 
00091 /** @defgroup STM32F429I_DISCOVERY_TS_Private_Functions STM32F429I DISCOVERY TS Private Functions
00092   * @{
00093   */
00094 
00095 /**
00096   * @brief  Initializes and configures the touch screen functionalities and 
00097   *         configures all necessary hardware resources (GPIOs, clocks..).
00098   * @param  XSize: The maximum X size of the TS area on LCD
00099   * @param  YSize: The maximum Y size of the TS area on LCD  
00100   * @retval TS_OK: if all initializations are OK. Other value if error.
00101   */
00102 uint8_t BSP_TS_Init(uint16_t XSize, uint16_t YSize)
00103 {
00104   uint8_t ret = TS_ERROR;
00105 
00106   /* Initialize x and y positions boundaries */
00107   TsXBoundary = XSize;
00108   TsYBoundary = YSize;
00109 
00110   /* Read ID and verify if the IO expander is ready */
00111   if(stmpe811_ts_drv.ReadID(TS_I2C_ADDRESS) == STMPE811_ID)
00112   {
00113     /* Initialize the TS driver structure */
00114     TsDrv = &stmpe811_ts_drv;
00115 
00116     ret = TS_OK;
00117   }
00118 
00119   if(ret == TS_OK)
00120   {
00121     /* Initialize the LL TS Driver */
00122     TsDrv->Init(TS_I2C_ADDRESS);
00123     TsDrv->Start(TS_I2C_ADDRESS);
00124   }
00125 
00126   return ret;
00127 }
00128 
00129 /**
00130   * @brief  Configures and enables the touch screen interrupts.
00131   * @retval TS_OK: if ITconfig is OK. Other value if error.
00132   */
00133 uint8_t BSP_TS_ITConfig(void)
00134 {
00135   /* Enable the TS ITs */
00136   TsDrv->EnableIT(TS_I2C_ADDRESS);
00137 
00138   return TS_OK;
00139 }
00140 
00141 /**
00142   * @brief  Gets the TS IT status.
00143   * @retval Interrupt status.
00144   */  
00145 uint8_t BSP_TS_ITGetStatus(void)
00146 {
00147   /* Return the TS IT status */
00148   return (TsDrv->GetITStatus(TS_I2C_ADDRESS));
00149 }
00150 
00151 /**
00152   * @brief  Returns status and positions of the touch screen.
00153   * @param  TsState: Pointer to touch screen current state structure
00154   */
00155 void BSP_TS_GetState(TS_StateTypeDef* TsState)
00156 {
00157   static uint32_t _x = 0, _y = 0;
00158   uint16_t xDiff, yDiff , x , y, xr, yr;
00159   
00160   TsState->TouchDetected = TsDrv->DetectTouch(TS_I2C_ADDRESS);
00161   
00162   if(TsState->TouchDetected)
00163   {
00164     TsDrv->GetXY(TS_I2C_ADDRESS, &x, &y);
00165     
00166     /* Y value first correction */
00167     y -= 360;  
00168     
00169     /* Y value second correction */
00170     yr = y / 11;
00171     
00172     /* Return y position value */
00173     if(yr <= 0)
00174     {
00175       yr = 0;
00176     }
00177     else if (yr > TsYBoundary)
00178     {
00179       yr = TsYBoundary - 1;
00180     }
00181     else
00182     {}
00183     y = yr;
00184     
00185     /* X value first correction */
00186     if(x <= 3000)
00187     {
00188       x = 3870 - x;
00189     }
00190     else
00191     {
00192       x = 3800 - x;
00193     }
00194     
00195     /* X value second correction */  
00196     xr = x / 15;
00197     
00198     /* Return X position value */
00199     if(xr <= 0)
00200     {
00201       xr = 0;
00202     }
00203     else if (xr > TsXBoundary)
00204     {
00205       xr = TsXBoundary - 1;
00206     }
00207     else 
00208     {}
00209     
00210     x = xr;
00211     xDiff = x > _x? (x - _x): (_x - x);
00212     yDiff = y > _y? (y - _y): (_y - y); 
00213     
00214     if (xDiff + yDiff > 5)
00215     {
00216       _x = x;
00217       _y = y; 
00218     }
00219     
00220     /* Update the X position */
00221     TsState->X = _x;
00222     
00223     /* Update the Y position */  
00224     TsState->Y = _y;
00225   }
00226 }
00227 
00228 /**
00229   * @brief  Clears all touch screen interrupts.
00230   */  
00231 void BSP_TS_ITClear(void)
00232 {
00233   /* Clear TS IT pending bits */
00234   TsDrv->ClearIT(TS_I2C_ADDRESS); 
00235 }
00236 
00237 /**
00238   * @}
00239   */ 
00240 
00241 /**
00242   * @}
00243   */ 
00244 
00245 /**
00246   * @}
00247   */ 
00248 
00249 /**
00250   * @}
00251   */ 
00252 
00253 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/