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nrfx_twi_twim.c
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nrfx_twi_twim.c
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/*
* Copyright (c) 2019 - 2020, Nordic Semiconductor ASA
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <nrfx_twi_twim.h>
#if NRFX_CHECK(NRFX_TWI_ENABLED) || NRFX_CHECK(NRFX_TWIM_ENABLED)
#include <hal/nrf_gpio.h>
#define TWI_TWIM_PIN_CONFIGURE(_pin) nrf_gpio_cfg((_pin), \
NRF_GPIO_PIN_DIR_OUTPUT, \
NRF_GPIO_PIN_INPUT_CONNECT, \
NRF_GPIO_PIN_PULLUP, \
NRF_GPIO_PIN_S0D1, \
NRF_GPIO_PIN_NOSENSE)
nrfx_err_t nrfx_twi_twim_bus_recover(uint32_t scl_pin, uint32_t sda_pin)
{
nrf_gpio_pin_set(scl_pin);
nrf_gpio_pin_set(sda_pin);
TWI_TWIM_PIN_CONFIGURE(scl_pin);
TWI_TWIM_PIN_CONFIGURE(sda_pin);
NRFX_DELAY_US(4);
for (uint8_t i = 0; i < 9; i++)
{
if (nrf_gpio_pin_read(sda_pin))
{
break;
}
else
{
// Pulse CLOCK signal
nrf_gpio_pin_clear(scl_pin);
NRFX_DELAY_US(4);
nrf_gpio_pin_set(scl_pin);
NRFX_DELAY_US(4);
}
}
// Generate a STOP condition on the bus
nrf_gpio_pin_clear(sda_pin);
NRFX_DELAY_US(4);
nrf_gpio_pin_set(sda_pin);
NRFX_DELAY_US(4);
if (nrf_gpio_pin_read(sda_pin))
{
return NRFX_SUCCESS;
}
else
{
return NRFX_ERROR_INTERNAL;
}
}
#endif // NRFX_CHECK(NRFX_TWI_ENABLED) || NRFX_CHECK(NRFX_TWIM_ENABLED)