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496 lines
15 KiB
496 lines
15 KiB
/** |
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****************************************************************************** |
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* @file ft6x06.c |
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* @author MCD Application Team |
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* @brief This file provides a set of functions needed to manage the FT6X06 |
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* IO Expander devices. |
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****************************************************************************** |
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* @attention |
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* |
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* <h2><center>© Copyright (c) 2016 STMicroelectronics. |
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* All rights reserved.</center></h2> |
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* |
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* This software component is licensed by ST under BSD 3-Clause license, |
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* the "License"; You may not use this file except in compliance with the |
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* License. You may obtain a copy of the License at: |
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* opensource.org/licenses/BSD-3-Clause |
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* |
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****************************************************************************** |
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*/ |
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/* Includes ------------------------------------------------------------------*/ |
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#include "ft6x06.h" |
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/** @addtogroup BSP |
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* @{ |
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*/ |
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/** @addtogroup Component |
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* @{ |
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*/ |
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/** @defgroup FT6X06 |
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* @{ |
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*/ |
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/* Private typedef -----------------------------------------------------------*/ |
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/** @defgroup FT6X06_Private_Defines FT6X06 Private Defines |
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* @{ |
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*/ |
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#define FT6x06_MAX_INSTANCE 2 |
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/** |
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* @} |
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*/ |
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/* Private macro -------------------------------------------------------------*/ |
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/** @defgroup FT6X06_Private_Variables FT6X06 Private Variables |
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* @{ |
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*/ |
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/* Touch screen driver structure initialization */ |
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TS_DrvTypeDef ft6x06_ts_drv = |
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{ |
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ft6x06_Init, |
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ft6x06_ReadID, |
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ft6x06_Reset, |
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ft6x06_TS_Start, |
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ft6x06_TS_DetectTouch, |
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ft6x06_TS_GetXY, |
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ft6x06_TS_EnableIT, |
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ft6x06_TS_ClearIT, |
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ft6x06_TS_ITStatus, |
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ft6x06_TS_DisableIT |
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}; |
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/* ft6x06 instances by address */ |
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uint8_t ft6x06[FT6x06_MAX_INSTANCE] = {0}; |
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/* Global ft6x06 handle */ |
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static ft6x06_handle_TypeDef ft6x06_handle = { FT6206_I2C_NOT_INITIALIZED, 0, 0}; |
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/** |
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* @} |
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*/ |
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/** @defgroup ft6x06_Private_Function_Prototypes ft6x06 Private Function Prototypes |
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* @{ |
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*/ |
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static uint8_t ft6x06_GetInstance(uint16_t DeviceAddr); |
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/* Private functions prototypes-----------------------------------------------*/ |
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#if (TS_AUTO_CALIBRATION_SUPPORTED == 1) |
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/** |
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* @brief Start TouchScreen calibration phase |
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* @param DeviceAddr: FT6206 Device address for communication on I2C Bus. |
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* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK. |
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*/ |
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static uint32_t ft6x06_TS_Calibration(uint16_t DeviceAddr); |
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#endif /* TS_AUTO_CALIBRATION_SUPPORTED == 1 */ |
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/** |
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* @brief Basic static configuration of TouchScreen |
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* @param DeviceAddr: FT6206 Device address for communication on I2C Bus. |
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* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK. |
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*/ |
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static uint32_t ft6x06_TS_Configure(uint16_t DeviceAddr); |
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/** |
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* @} |
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*/ |
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/** @defgroup ft6x06_Private_Functions ft6x06 Private Functions |
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* @{ |
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*/ |
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/** |
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* @brief Initialize the ft6x06 communication bus |
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* from MCU to FT6206 : ie I2C channel initialization (if required). |
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* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6206). |
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* @retval None |
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*/ |
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void ft6x06_Init(uint16_t DeviceAddr) |
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{ |
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uint8_t instance; |
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uint8_t empty; |
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/* Check if device instance already exists */ |
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instance = ft6x06_GetInstance(DeviceAddr); |
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/* To prevent double initialization */ |
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if(instance == 0xFF) |
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{ |
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/* Look for empty instance */ |
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empty = ft6x06_GetInstance(0); |
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if(empty < FT6x06_MAX_INSTANCE) |
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{ |
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/* Register the current device instance */ |
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ft6x06[empty] = DeviceAddr; |
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/* Initialize IO BUS layer */ |
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TS_IO_Init(); |
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} |
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} |
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} |
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/** |
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* @brief Software Reset the ft6x06. |
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* @note : Not applicable to FT6206. |
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* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6206). |
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* @retval None |
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*/ |
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void ft6x06_Reset(uint16_t DeviceAddr) |
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{ |
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/* Do nothing */ |
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/* No software reset sequence available in FT6206 IC */ |
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} |
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/** |
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* @brief Read the ft6x06 device ID, pre initialize I2C in case of need to be |
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* able to read the FT6206 device ID, and verify this is a FT6206. |
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* @param DeviceAddr: I2C FT6x06 Slave address. |
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* @retval The Device ID (two bytes). |
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*/ |
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uint16_t ft6x06_ReadID(uint16_t DeviceAddr) |
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{ |
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/* Initialize I2C link if needed */ |
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TS_IO_Init(); |
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/* Return the device ID value */ |
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return (TS_IO_Read(DeviceAddr, FT6206_CHIP_ID_REG)); |
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} |
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/** |
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* @brief Configures the touch Screen IC device to start detecting touches |
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* It goes through an internal calibration process (Hw calibration sequence of |
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* the touch screen). |
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* @param DeviceAddr: Device address on communication Bus (I2C slave address). |
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* @retval None. |
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*/ |
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void ft6x06_TS_Start(uint16_t DeviceAddr) |
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{ |
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#if (TS_AUTO_CALIBRATION_SUPPORTED == 1) |
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/* Hw Calibration sequence start : should be done once after each power up */ |
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/* This is called internal calibration of the touch screen */ |
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ft6x06_TS_Calibration(DeviceAddr); |
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#endif |
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/* Minimum static configuration of FT6206 */ |
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ft6x06_TS_Configure(DeviceAddr); |
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/* By default set FT6206 IC in Polling mode : no INT generation on FT6206 for new touch available */ |
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/* Note TS_INT is active low */ |
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ft6x06_TS_DisableIT(DeviceAddr); |
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} |
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/** |
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* @brief Return if there is touches detected or not. |
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* Try to detect new touches and forget the old ones (reset internal global |
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* variables). |
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* @param DeviceAddr: Device address on communication Bus. |
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* @retval : Number of active touches detected (can be 0, 1 or 2). |
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*/ |
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uint8_t ft6x06_TS_DetectTouch(uint16_t DeviceAddr) |
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{ |
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volatile uint8_t nbTouch = 0; |
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/* Read register FT6206_TD_STAT_REG to check number of touches detection */ |
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nbTouch = TS_IO_Read(DeviceAddr, FT6206_TD_STAT_REG); |
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nbTouch &= FT6206_TD_STAT_MASK; |
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if(nbTouch > FT6206_MAX_DETECTABLE_TOUCH) |
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{ |
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/* If invalid number of touch detected, set it to zero */ |
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nbTouch = 0; |
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} |
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/* Update ft6x06 driver internal global : current number of active touches */ |
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ft6x06_handle.currActiveTouchNb = nbTouch; |
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/* Reset current active touch index on which to work on */ |
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ft6x06_handle.currActiveTouchIdx = 0; |
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return(nbTouch); |
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} |
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/** |
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* @brief Get the touch screen X and Y positions values |
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* Manage multi touch thanks to touch Index global |
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* variable 'ft6x06_handle.currActiveTouchIdx'. |
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* @param DeviceAddr: Device address on communication Bus. |
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* @param X: Pointer to X position value |
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* @param Y: Pointer to Y position value |
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* @retval None. |
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*/ |
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void ft6x06_TS_GetXY(uint16_t DeviceAddr, uint16_t *X, uint16_t *Y) |
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{ |
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uint8_t regAddress = 0; |
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uint8_t dataxy[4]; |
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if(ft6x06_handle.currActiveTouchIdx < ft6x06_handle.currActiveTouchNb) |
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{ |
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switch(ft6x06_handle.currActiveTouchIdx) |
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{ |
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case 0 : |
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regAddress = FT6206_P1_XH_REG; |
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break; |
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case 1 : |
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regAddress = FT6206_P2_XH_REG; |
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break; |
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default : |
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break; |
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} |
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/* Read X and Y positions */ |
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TS_IO_ReadMultiple(DeviceAddr, regAddress, dataxy, sizeof(dataxy)); |
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/* Send back ready X position to caller */ |
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*X = ((dataxy[0] & FT6206_MSB_MASK) << 8) | (dataxy[1] & FT6206_LSB_MASK); |
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/* Send back ready Y position to caller */ |
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*Y = ((dataxy[2] & FT6206_MSB_MASK) << 8) | (dataxy[3] & FT6206_LSB_MASK); |
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ft6x06_handle.currActiveTouchIdx++; |
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} |
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} |
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/** |
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* @brief Configure the FT6206 device to generate IT on given INT pin |
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* connected to MCU as EXTI. |
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* @param DeviceAddr: Device address on communication Bus (Slave I2C address of FT6206). |
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* @retval None |
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*/ |
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void ft6x06_TS_EnableIT(uint16_t DeviceAddr) |
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{ |
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uint8_t regValue = 0; |
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regValue = (FT6206_G_MODE_INTERRUPT_TRIGGER & (FT6206_G_MODE_INTERRUPT_MASK >> FT6206_G_MODE_INTERRUPT_SHIFT)) << FT6206_G_MODE_INTERRUPT_SHIFT; |
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/* Set interrupt trigger mode in FT6206_GMODE_REG */ |
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TS_IO_Write(DeviceAddr, FT6206_GMODE_REG, regValue); |
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} |
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/** |
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* @brief Configure the FT6206 device to stop generating IT on the given INT pin |
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* connected to MCU as EXTI. |
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* @param DeviceAddr: Device address on communication Bus (Slave I2C address of FT6206). |
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* @retval None |
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*/ |
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void ft6x06_TS_DisableIT(uint16_t DeviceAddr) |
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{ |
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uint8_t regValue = 0; |
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regValue = (FT6206_G_MODE_INTERRUPT_POLLING & (FT6206_G_MODE_INTERRUPT_MASK >> FT6206_G_MODE_INTERRUPT_SHIFT)) << FT6206_G_MODE_INTERRUPT_SHIFT; |
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/* Set interrupt polling mode in FT6206_GMODE_REG */ |
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TS_IO_Write(DeviceAddr, FT6206_GMODE_REG, regValue); |
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} |
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/** |
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* @brief Get IT status from FT6206 interrupt status registers |
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* Should be called Following an EXTI coming to the MCU to know the detailed |
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* reason of the interrupt. |
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* @note : This feature is not applicable to FT6206. |
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* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6206). |
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* @retval TS interrupts status : always return 0 here |
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*/ |
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uint8_t ft6x06_TS_ITStatus(uint16_t DeviceAddr) |
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{ |
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/* Always return 0 as feature not applicable to FT6206 */ |
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return 0; |
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} |
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/** |
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* @brief Clear IT status in FT6206 interrupt status clear registers |
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* Should be called Following an EXTI coming to the MCU. |
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* @note : This feature is not applicable to FT6206. |
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* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6206). |
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* @retval None |
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*/ |
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void ft6x06_TS_ClearIT(uint16_t DeviceAddr) |
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{ |
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/* Nothing to be done here for FT6206 */ |
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} |
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/**** NEW FEATURES enabled when Multi-touch support is enabled ****/ |
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#if (TS_MULTI_TOUCH_SUPPORTED == 1) |
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/** |
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* @brief Get the last touch gesture identification (zoom, move up/down...). |
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* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6x06). |
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* @param pGestureId : Pointer to get last touch gesture Identification. |
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* @retval None. |
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*/ |
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void ft6x06_TS_GetGestureID(uint16_t DeviceAddr, uint32_t * pGestureId) |
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{ |
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volatile uint8_t ucReadData = 0; |
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ucReadData = TS_IO_Read(DeviceAddr, FT6206_GEST_ID_REG); |
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* pGestureId = ucReadData; |
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} |
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/** |
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* @brief Get the touch detailed informations on touch number 'touchIdx' (0..1) |
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* This touch detailed information contains : |
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* - weight that was applied to this touch |
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* - sub-area of the touch in the touch panel |
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* - event of linked to the touch (press down, lift up, ...) |
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* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6x06). |
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* @param touchIdx : Passed index of the touch (0..1) on which we want to get the |
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* detailed information. |
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* @param pWeight : Pointer to to get the weight information of 'touchIdx'. |
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* @param pArea : Pointer to to get the sub-area information of 'touchIdx'. |
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* @param pEvent : Pointer to to get the event information of 'touchIdx'. |
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* @retval None. |
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*/ |
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void ft6x06_TS_GetTouchInfo(uint16_t DeviceAddr, |
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uint32_t touchIdx, |
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uint32_t * pWeight, |
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uint32_t * pArea, |
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uint32_t * pEvent) |
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{ |
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uint8_t regAddress = 0; |
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uint8_t dataxy[3]; |
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if(touchIdx < ft6x06_handle.currActiveTouchNb) |
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{ |
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switch(touchIdx) |
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{ |
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case 0 : |
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regAddress = FT6206_P1_WEIGHT_REG; |
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break; |
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case 1 : |
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regAddress = FT6206_P2_WEIGHT_REG; |
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break; |
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default : |
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break; |
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} /* end switch(touchIdx) */ |
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/* Read weight, area and Event Id of touch index */ |
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TS_IO_ReadMultiple(DeviceAddr, regAddress, dataxy, sizeof(dataxy)); |
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/* Return weight of touch index */ |
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* pWeight = (dataxy[0] & FT6206_TOUCH_WEIGHT_MASK) >> FT6206_TOUCH_WEIGHT_SHIFT; |
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/* Return area of touch index */ |
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* pArea = (dataxy[1] & FT6206_TOUCH_AREA_MASK) >> FT6206_TOUCH_AREA_SHIFT; |
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/* Return Event Id of touch index */ |
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* pEvent = (dataxy[2] & FT6206_TOUCH_EVT_FLAG_MASK) >> FT6206_TOUCH_EVT_FLAG_SHIFT; |
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} /* of if(touchIdx < ft6x06_handle.currActiveTouchNb) */ |
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} |
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#endif /* TS_MULTI_TOUCH_SUPPORTED == 1 */ |
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#if (TS_AUTO_CALIBRATION_SUPPORTED == 1) |
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/** |
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* @brief Start TouchScreen calibration phase |
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* @param DeviceAddr: FT6206 Device address for communication on I2C Bus. |
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* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK. |
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*/ |
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static uint32_t ft6x06_TS_Calibration(uint16_t DeviceAddr) |
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{ |
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uint32_t nbAttempt = 0; |
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volatile uint8_t ucReadData; |
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volatile uint8_t regValue; |
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uint32_t status = FT6206_STATUS_OK; |
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uint8_t bEndCalibration = 0; |
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/* >> Calibration sequence start */ |
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/* Switch FT6206 back to factory mode to calibrate */ |
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regValue = (FT6206_DEV_MODE_FACTORY & FT6206_DEV_MODE_MASK) << FT6206_DEV_MODE_SHIFT; |
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TS_IO_Write(DeviceAddr, FT6206_DEV_MODE_REG, regValue); /* 0x40 */ |
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/* Read back the same register FT6206_DEV_MODE_REG */ |
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ucReadData = TS_IO_Read(DeviceAddr, FT6206_DEV_MODE_REG); |
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TS_IO_Delay(300); /* Wait 300 ms */ |
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if(((ucReadData & (FT6206_DEV_MODE_MASK << FT6206_DEV_MODE_SHIFT)) >> FT6206_DEV_MODE_SHIFT) != FT6206_DEV_MODE_FACTORY ) |
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{ |
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/* Return error to caller */ |
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return(FT6206_STATUS_NOT_OK); |
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} |
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/* Start calibration command */ |
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TS_IO_Write(DeviceAddr, FT6206_TD_STAT_REG, 0x04); |
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TS_IO_Delay(300); /* Wait 300 ms */ |
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/* 100 attempts to wait switch from factory mode (calibration) to working mode */ |
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for (nbAttempt=0; ((nbAttempt < 100) && (!bEndCalibration)) ; nbAttempt++) |
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{ |
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ucReadData = TS_IO_Read(DeviceAddr, FT6206_DEV_MODE_REG); |
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ucReadData = (ucReadData & (FT6206_DEV_MODE_MASK << FT6206_DEV_MODE_SHIFT)) >> FT6206_DEV_MODE_SHIFT; |
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if(ucReadData == FT6206_DEV_MODE_WORKING) |
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{ |
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/* Auto Switch to FT6206_DEV_MODE_WORKING : means calibration have ended */ |
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bEndCalibration = 1; /* exit for loop */ |
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} |
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TS_IO_Delay(200); /* Wait 200 ms */ |
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} |
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/* Calibration sequence end << */ |
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return(status); |
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} |
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#endif /* TS_AUTO_CALIBRATION_SUPPORTED == 1 */ |
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/** |
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* @brief Basic static configuration of TouchScreen |
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* @param DeviceAddr: FT6206 Device address for communication on I2C Bus. |
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* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK. |
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*/ |
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static uint32_t ft6x06_TS_Configure(uint16_t DeviceAddr) |
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{ |
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uint32_t status = FT6206_STATUS_OK; |
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/* Nothing special to be done for FT6206 */ |
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return(status); |
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} |
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/** |
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* @brief Check if the device instance of the selected address is already registered |
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* and return its index |
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* @param DeviceAddr: Device address on communication Bus. |
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* @retval Index of the device instance if registered, 0xFF if not. |
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*/ |
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static uint8_t ft6x06_GetInstance(uint16_t DeviceAddr) |
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{ |
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uint8_t idx = 0; |
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/* Check all the registered instances */ |
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for(idx = 0; idx < FT6x06_MAX_INSTANCE ; idx ++) |
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{ |
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if(ft6x06[idx] == DeviceAddr) |
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{ |
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return idx; |
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} |
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} |
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return 0xFF; |
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} |
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/** |
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* @} |
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*/ |
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/** |
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* @} |
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*/ |
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/** |
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* @} |
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*/ |
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/** |
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* @} |
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*/ |
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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