I2C touch support on Touch Display.

License

This file is licensensed under the Silabs License Agreement. See the file "Silabs_License_Agreement.txt" for details. Before using this software for any purpose, you must agree to the terms of that agreement.

Definition in file i2ccaptouch.c .


       #include "
       
        i2ccaptouch.h
       
       "


       #include "captouchconfig.h"


       #include "i2cspmconfig.h"


       #include "
       
        i2cspm.h
       
       "


       #include <stdint.h>


       #include <stdbool.h>


       #include <string.h>


       #include "
       
        em_device.h
       
       "


       #include "
       
        em_cmu.h
       
       "


       #include "
       
        em_core.h
       
       "


       #include "
       
        em_gpio.h
       
       "


       #include "
       
        em_i2c.h
       
       "


       #include "
       
        emstatus.h
       
       "


       #include "
       
        ustimer.h
       
       "

Functions
uint32_t	CAPT_enable (bool enable, bool wait)
	Enable touch controller. When enabling this function will wait until the controller is started before returning.

uint32_t	CAPT_getTouches ( CAPT_Touch touchBuffer, uint8_t len, uint8_t nTouches)
	Update the list of registered touches This function also updates the list of new touches since last time CAPT_update was called.

uint32_t	CAPT_init (void)
	Initialize capacitive touch controller.

static I2C_TransferReturn_TypeDef	controllerRead (void)
	Read contents of all registers in the touch controller.

static uint32_t	gpioInit (void)
	Initialize all GPIO pins.

static uint32_t	i2cInit (void)
	Initialize I2C peripheral.

static uint32_t	parseData ( CAPT_Touch buffer, uint8_t len, uint8_t nTouches)
	Parse data from i2cReadBuffer into buffer.

Variables
static I2C_TypeDef *	i2c = CAPT_CONFIG_I2C

static uint8_t	i2cReadBuffer [CAPT_I2C_BUFFER_SIZE]

static volatile uint8_t	samplesSinceLastUpdate = 0

Function Documentation

uint32_t CAPT_enable	(	bool	`enable,`
		bool	`wait`
	)

Enable touch controller. When enabling this function will wait until the controller is started before returning.

Parameters

`enable`	If true the controller will be enabled, otherwise it will be disabled.
`wait`	If true when enabling controller, wait for the touch controller to boot after enabling it. Has no effect when disabling the touch controller.

Returns: CAPT_OK on success.

Definition at line 113 of file i2ccaptouch.c .

References GPIO_PinOutClear() , GPIO_PinOutSet() , USTIMER_DeInit() , USTIMER_DelayIntSafe() , and USTIMER_Init() .

uint32_t CAPT_getTouches	(	CAPT_Touch *	`touchBuffer,`
		uint8_t	`len,`
		uint8_t *	`nTouches`
	)

Update the list of registered touches This function also updates the list of new touches since last time CAPT_update was called.

Parameters

`*buffer`	Pointer to a buffer in which to store the CAPT_Touch structs
`len`	Length (in number of CAPT_Touch elements) of the buffer
`*nTouches`	Number of touches read out

Returns: CAPT_OK on success. CAPT_ERROR_PARSE_ERROR if data is invalid. CAPT_ERROR_BUFFER_TOO_SMALL if the buffer is too short. In this case as much data as possible is stored in the buffer. CAPT_ERROR_I2C_ERROR on I2C transfer error

Definition at line 161 of file i2ccaptouch.c .

References controllerRead() , and parseData() .

uint32_t CAPT_init ( void )

Initialize capacitive touch controller.

Returns: CAPT_OK on success

Definition at line 81 of file i2ccaptouch.c .

References gpioInit() , and i2cInit() .

static I2C_TransferReturn_TypeDef controllerRead ( void )

static

Read contents of all registers in the touch controller.

Returns: i2cTransferDone on success.

Definition at line 256 of file i2ccaptouch.c .

References I2C_TransferSeq_TypeDef::addr , I2C_TransferSeq_TypeDef::buf , I2C_TransferSeq_TypeDef::data , I2C_TransferSeq_TypeDef::flags , I2C_FLAG_READ , I2C_FLAG_WRITE , I2CSPM_Transfer() , i2cTransferDone , and I2C_TransferSeq_TypeDef::len .

Referenced by CAPT_getTouches() .

static uint32_t gpioInit ( void )

static

Initialize all GPIO pins.

Returns: CAPT_OK on success

Definition at line 201 of file i2ccaptouch.c .

References CMU_ClockEnable() , cmuClock_GPIO , GPIO_PinModeSet() , gpioModeInput , gpioModePushPull , and gpioModeWiredAnd .

Referenced by CAPT_init() .

static uint32_t i2cInit ( void )

static

Initialize I2C peripheral.

Returns: CAPT_OK on success

Definition at line 235 of file i2ccaptouch.c .

References I2CSPM_Init() .

Referenced by BOARD_init() , BSP_initBoard() , CAPT_init() , I2CSPM_Init() , and setupI2C() .

static uint32_t parseData	(	CAPT_Touch *	`buffer,`
		uint8_t	`len,`
		uint8_t *	`nTouches`
	)

static

Parse data from i2cReadBuffer into buffer.

Parameters

`*buffer`	Pointer to a buffer in which to store the CAPT_Touch structs
`len`	Length (in number of CAPT_Touch elements) of the buffer
`*nTouches`	Number of touches read out

Returns: CAPT_OK on success. CAPT_ERROR_PARSE_ERROR if data is invalid. CAPT_ERROR_BUFFER_TOO_SMALL if the buffer is too short. In this case as much data as possible is stored in the buffer.

Definition at line 316 of file i2ccaptouch.c .

Referenced by CAPT_getTouches() .

i2ccaptouch.c File Reference

License

Functions

Variables

Function Documentation