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/**
******************************************************************************
* @file ft6x06.c
* @author MCD Application Team
* @brief This file provides a set of functions needed to manage the FT6X06
* IO Expander devices.
******************************************************************************
* @attention
*
* Copyright (c) 2016 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 "ft6x06.h"
/** @addtogroup BSP
* @{
*/
/** @addtogroup Component
* @{
*/
/** @defgroup FT6XX6
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/** @defgroup FT6XX6_Private_Defines FT6XX6 Private Defines
* @{
*/
#define FT6x06_MAX_INSTANCE 2
/**
* @}
*/
/* Private macro -------------------------------------------------------------*/
/** @defgroup FT6XX6_Private_Variables FT6XX6 Private Variables
* @{
*/
/* Touch screen driver structure initialization */
TS_DrvTypeDef ft6x06_ts_drv =
{
ft6x06_Init,
ft6x06_ReadID,
ft6x06_Reset,
ft6x06_TS_Start,
ft6x06_TS_DetectTouch,
ft6x06_TS_GetXY,
ft6x06_TS_EnableIT,
ft6x06_TS_ClearIT,
ft6x06_TS_ITStatus,
ft6x06_TS_DisableIT
};
/* ft6xx6 instances by address */
uint8_t ft6x06[FT6x06_MAX_INSTANCE] = {0};
/* Global ft6xx6 handle */
static ft6x06_handle_TypeDef ft6x06_handle = { FT6206_I2C_NOT_INITIALIZED, 0, 0};
/**
* @}
*/
/** @defgroup ft6xx6_Private_Function_Prototypes ft6xx6 Private Function Prototypes
* @{
*/
static uint8_t ft6x06_GetInstance(uint16_t DeviceAddr);
/* Private functions prototypes-----------------------------------------------*/
#if (TS_AUTO_CALIBRATION_SUPPORTED == 1)
/**
* @brief Start TouchScreen calibration phase
* @param DeviceAddr: FT6xx6 Device address for communication on I2C Bus.
* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK.
*/
static uint32_t ft6x06_TS_Calibration(uint16_t DeviceAddr);
#endif /* TS_AUTO_CALIBRATION_SUPPORTED == 1 */
/**
* @brief Basic static configuration of TouchScreen
* @param DeviceAddr: FT6xx6 Device address for communication on I2C Bus.
* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK.
*/
static uint32_t ft6x06_TS_Configure(uint16_t DeviceAddr);
/**
* @}
*/
/** @defgroup ft6xx6_Private_Functions ft6xx6 Private Functions
* @{
*/
/**
* @brief Initialize the ft6xx6 communication bus
* from MCU to FT6xx6 : ie I2C channel initialization (if required).
* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6xx6).
* @retval None
*/
void ft6x06_Init(uint16_t DeviceAddr)
{
uint8_t instance;
uint8_t empty;
/* Check if device instance already exists */
instance = ft6x06_GetInstance(DeviceAddr);
/* To prevent double initialization */
if(instance == 0xFF)
{
/* Look for empty instance */
empty = ft6x06_GetInstance(0);
if(empty < FT6x06_MAX_INSTANCE)
{
/* Register the current device instance */
ft6x06[empty] = DeviceAddr;
/* Initialize IO BUS layer */
TS_IO_Init();
}
}
}
/**
* @brief Software Reset the ft6xx6.
* @note : Not applicable to FT6xx6.
* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6xx6).
* @retval None
*/
void ft6x06_Reset(uint16_t DeviceAddr)
{
/* Do nothing */
/* No software reset sequence available in FT6xx6 IC */
}
/**
* @brief Read the ft6xx6 device ID, pre initialize I2C in case of need to be
* able to read the FT6xx6 device ID, and verify this is a FT6xx6.
* @param DeviceAddr: I2C FT6xx6 Slave address.
* @retval The Device ID (two bytes).
*/
uint16_t ft6x06_ReadID(uint16_t DeviceAddr)
{
/* Initialize I2C link if needed */
TS_IO_Init();
/* Return the device ID value */
return (TS_IO_Read(DeviceAddr, FT6206_CHIP_ID_REG));
}
/**
* @brief Configures the touch Screen IC device to start detecting touches
* It goes through an internal calibration process (Hw calibration sequence of
* the touch screen).
* @param DeviceAddr: Device address on communication Bus (I2C slave address).
* @retval None.
*/
void ft6x06_TS_Start(uint16_t DeviceAddr)
{
#if (TS_AUTO_CALIBRATION_SUPPORTED == 1)
/* Hw Calibration sequence start : should be done once after each power up */
/* This is called internal calibration of the touch screen */
ft6x06_TS_Calibration(DeviceAddr);
#endif
/* Minimum static configuration of FT6xx6 */
ft6x06_TS_Configure(DeviceAddr);
/* By default set FT6xx6 IC in Polling mode : no INT generation on FT6xx6 for new touch available */
/* Note TS_INT is active low */
ft6x06_TS_DisableIT(DeviceAddr);
}
/**
* @brief Return if there is touches detected or not.
* Try to detect new touches and forget the old ones (reset internal global
* variables).
* @param DeviceAddr: Device address on communication Bus.
* @retval : Number of active touches detected (can be 0, 1 or 2).
*/
uint8_t ft6x06_TS_DetectTouch(uint16_t DeviceAddr)
{
volatile uint8_t nbTouch = 0;
/* Read register FT6206_TD_STAT_REG to check number of touches detection */
nbTouch = TS_IO_Read(DeviceAddr, FT6206_TD_STAT_REG);
nbTouch &= FT6206_TD_STAT_MASK;
if(nbTouch > FT6206_MAX_DETECTABLE_TOUCH)
{
/* If invalid number of touch detected, set it to zero */
nbTouch = 0;
}
/* Update ft6xx6 driver internal global : current number of active touches */
ft6x06_handle.currActiveTouchNb = nbTouch;
/* Reset current active touch index on which to work on */
ft6x06_handle.currActiveTouchIdx = 0;
return(nbTouch);
}
/**
* @brief Get the touch screen X and Y positions values
* Manage multi touch thanks to touch Index global
* variable 'ft6x06_handle.currActiveTouchIdx'.
* @param DeviceAddr: Device address on communication Bus.
* @param X: Pointer to X position value
* @param Y: Pointer to Y position value
* @retval None.
*/
void ft6x06_TS_GetXY(uint16_t DeviceAddr, uint16_t *X, uint16_t *Y)
{
uint8_t regAddress = 0;
uint8_t dataxy[4];
if(ft6x06_handle.currActiveTouchIdx < ft6x06_handle.currActiveTouchNb)
{
switch(ft6x06_handle.currActiveTouchIdx)
{
case 0 :
regAddress = FT6206_P1_XH_REG;
break;
case 1 :
regAddress = FT6206_P2_XH_REG;
break;
default :
break;
}
/* Read X and Y positions */
TS_IO_ReadMultiple(DeviceAddr, regAddress, dataxy, sizeof(dataxy));
/* Send back ready X position to caller */
*X = ((dataxy[0] & FT6206_MSB_MASK) << 8) | (dataxy[1] & FT6206_LSB_MASK);
/* Send back ready Y position to caller */
*Y = ((dataxy[2] & FT6206_MSB_MASK) << 8) | (dataxy[3] & FT6206_LSB_MASK);
ft6x06_handle.currActiveTouchIdx++;
}
}
/**
* @brief Configure the FT6xx6 device to generate IT on given INT pin
* connected to MCU as EXTI.
* @param DeviceAddr: Device address on communication Bus (Slave I2C address of FT6xx6).
* @retval None
*/
void ft6x06_TS_EnableIT(uint16_t DeviceAddr)
{
uint8_t regValue = 0;
regValue = (FT6206_G_MODE_INTERRUPT_TRIGGER & (FT6206_G_MODE_INTERRUPT_MASK >> FT6206_G_MODE_INTERRUPT_SHIFT)) << FT6206_G_MODE_INTERRUPT_SHIFT;
/* Set interrupt trigger mode in FT6206_GMODE_REG */
TS_IO_Write(DeviceAddr, FT6206_GMODE_REG, regValue);
}
/**
* @brief Configure the FT6xx6 device to stop generating IT on the given INT pin
* connected to MCU as EXTI.
* @param DeviceAddr: Device address on communication Bus (Slave I2C address of FT6xx6).
* @retval None
*/
void ft6x06_TS_DisableIT(uint16_t DeviceAddr)
{
uint8_t regValue = 0;
regValue = (FT6206_G_MODE_INTERRUPT_POLLING & (FT6206_G_MODE_INTERRUPT_MASK >> FT6206_G_MODE_INTERRUPT_SHIFT)) << FT6206_G_MODE_INTERRUPT_SHIFT;
/* Set interrupt polling mode in FT6206_GMODE_REG */
TS_IO_Write(DeviceAddr, FT6206_GMODE_REG, regValue);
}
/**
* @brief Get IT status from FT6xx6 interrupt status registers
* Should be called Following an EXTI coming to the MCU to know the detailed
* reason of the interrupt.
* @note : This feature is not applicable to FT6xx6.
* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6xx6).
* @retval TS interrupts status : always return 0 here
*/
uint8_t ft6x06_TS_ITStatus(uint16_t DeviceAddr)
{
/* Always return 0 as feature not applicable to FT6xx6 */
return 0;
}
/**
* @brief Clear IT status in FT6xx6 interrupt status clear registers
* Should be called Following an EXTI coming to the MCU.
* @note : This feature is not applicable to FT6xx6.
* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6xx6).
* @retval None
*/
void ft6x06_TS_ClearIT(uint16_t DeviceAddr)
{
/* Nothing to be done here for FT6xx6 */
}
/**** NEW FEATURES enabled when Multi-touch support is enabled ****/
#if (TS_MULTI_TOUCH_SUPPORTED == 1)
/**
* @brief Get the last touch gesture identification (zoom, move up/down...).
* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6xx6).
* @param pGestureId : Pointer to get last touch gesture Identification.
* @retval None.
*/
void ft6x06_TS_GetGestureID(uint16_t DeviceAddr, uint32_t * pGestureId)
{
volatile uint8_t ucReadData = 0;
ucReadData = TS_IO_Read(DeviceAddr, FT6206_GEST_ID_REG);
* pGestureId = ucReadData;
}
/**
* @brief Get the touch detailed informations on touch number 'touchIdx' (0..1)
* This touch detailed information contains :
* - weight that was applied to this touch
* - sub-area of the touch in the touch panel
* - event of linked to the touch (press down, lift up, ...)
* @param DeviceAddr: Device address on communication Bus (I2C slave address of FT6xx6).
* @param touchIdx : Passed index of the touch (0..1) on which we want to get the
* detailed information.
* @param pWeight : Pointer to to get the weight information of 'touchIdx'.
* @param pArea : Pointer to to get the sub-area information of 'touchIdx'.
* @param pEvent : Pointer to to get the event information of 'touchIdx'.
* @retval None.
*/
void ft6x06_TS_GetTouchInfo(uint16_t DeviceAddr,
uint32_t touchIdx,
uint32_t * pWeight,
uint32_t * pArea,
uint32_t * pEvent)
{
uint8_t regAddress = 0;
uint8_t dataxy[3];
if(touchIdx < ft6x06_handle.currActiveTouchNb)
{
switch(touchIdx)
{
case 0 :
regAddress = FT6206_P1_WEIGHT_REG;
break;
case 1 :
regAddress = FT6206_P2_WEIGHT_REG;
break;
default :
break;
} /* end switch(touchIdx) */
/* Read weight, area and Event Id of touch index */
TS_IO_ReadMultiple(DeviceAddr, regAddress, dataxy, sizeof(dataxy));
/* Return weight of touch index */
* pWeight = (dataxy[0] & FT6206_TOUCH_WEIGHT_MASK) >> FT6206_TOUCH_WEIGHT_SHIFT;
/* Return area of touch index */
* pArea = (dataxy[1] & FT6206_TOUCH_AREA_MASK) >> FT6206_TOUCH_AREA_SHIFT;
/* Return Event Id of touch index */
* pEvent = (dataxy[2] & FT6206_TOUCH_EVT_FLAG_MASK) >> FT6206_TOUCH_EVT_FLAG_SHIFT;
} /* of if(touchIdx < ft6x06_handle.currActiveTouchNb) */
}
#endif /* TS_MULTI_TOUCH_SUPPORTED == 1 */
#if (TS_AUTO_CALIBRATION_SUPPORTED == 1)
/**
* @brief Start TouchScreen calibration phase
* @param DeviceAddr: FT6xx6 Device address for communication on I2C Bus.
* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK.
*/
static uint32_t ft6x06_TS_Calibration(uint16_t DeviceAddr)
{
uint32_t nbAttempt = 0;
volatile uint8_t ucReadData;
volatile uint8_t regValue;
uint32_t status = FT6206_STATUS_OK;
uint8_t bEndCalibration = 0;
/* >> Calibration sequence start */
/* Switch FT6xx6 back to factory mode to calibrate */
regValue = (FT6206_DEV_MODE_FACTORY & FT6206_DEV_MODE_MASK) << FT6206_DEV_MODE_SHIFT;
TS_IO_Write(DeviceAddr, FT6206_DEV_MODE_REG, regValue); /* 0x40 */
/* Read back the same register FT6206_DEV_MODE_REG */
ucReadData = TS_IO_Read(DeviceAddr, FT6206_DEV_MODE_REG);
TS_IO_Delay(300); /* Wait 300 ms */
if(((ucReadData & (FT6206_DEV_MODE_MASK << FT6206_DEV_MODE_SHIFT)) >> FT6206_DEV_MODE_SHIFT) != FT6206_DEV_MODE_FACTORY )
{
/* Return error to caller */
return(FT6206_STATUS_NOT_OK);
}
/* Start calibration command */
TS_IO_Write(DeviceAddr, FT6206_TD_STAT_REG, 0x04);
TS_IO_Delay(300); /* Wait 300 ms */
/* 100 attempts to wait switch from factory mode (calibration) to working mode */
for (nbAttempt=0; ((nbAttempt < 100) && (!bEndCalibration)) ; nbAttempt++)
{
ucReadData = TS_IO_Read(DeviceAddr, FT6206_DEV_MODE_REG);
ucReadData = (ucReadData & (FT6206_DEV_MODE_MASK << FT6206_DEV_MODE_SHIFT)) >> FT6206_DEV_MODE_SHIFT;
if(ucReadData == FT6206_DEV_MODE_WORKING)
{
/* Auto Switch to FT6206_DEV_MODE_WORKING : means calibration have ended */
bEndCalibration = 1; /* exit for loop */
}
TS_IO_Delay(200); /* Wait 200 ms */
}
/* Calibration sequence end << */
return(status);
}
#endif /* TS_AUTO_CALIBRATION_SUPPORTED == 1 */
/**
* @brief Basic static configuration of TouchScreen
* @param DeviceAddr: FT6xx6 Device address for communication on I2C Bus.
* @retval Status FT6206_STATUS_OK or FT6206_STATUS_NOT_OK.
*/
static uint32_t ft6x06_TS_Configure(uint16_t DeviceAddr)
{
uint32_t status = FT6206_STATUS_OK;
/* Nothing special to be done for FT6xx6 */
return(status);
}
/**
* @brief Check if the device instance of the selected address is already registered
* and return its index
* @param DeviceAddr: Device address on communication Bus.
* @retval Index of the device instance if registered, 0xFF if not.
*/
static uint8_t ft6x06_GetInstance(uint16_t DeviceAddr)
{
uint8_t idx = 0;
/* Check all the registered instances */
for(idx = 0; idx < FT6x06_MAX_INSTANCE ; idx ++)
{
if(ft6x06[idx] == DeviceAddr)
{
return idx;
}
}
return 0xFF;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/