I2C touch support on Touch Display.

License

SPDX-License-Identifier: Zlib

The licensor of this software is Silicon Laboratories Inc.

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
This notice may not be removed or altered from any source distribution.

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 129 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 177 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 97 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 272 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 217 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 251 of file i2ccaptouch.c .

References I2CSPM_Init() .

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

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 332 of file i2ccaptouch.c .

Referenced by CAPT_getTouches() .

i2ccaptouch.c File Reference

License

Functions

Variables

Function Documentation