193 lines
7.2 KiB
C
193 lines
7.2 KiB
C
/**
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* Copyright (c) 2017 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "nrf_drv_twi.h"
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#include <nrf_delay.h>
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#include <hal/nrf_gpio.h>
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#ifdef TWIM_PRESENT
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#define INSTANCE_COUNT TWIM_COUNT
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#else
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#define INSTANCE_COUNT TWI_COUNT
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#endif
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#define SCL_PIN_INIT_CONF \
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( (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
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| (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
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| (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \
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| (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
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| (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos))
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#define SDA_PIN_INIT_CONF SCL_PIN_INIT_CONF
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#define SDA_PIN_UNINIT_CONF \
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( (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
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| (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) \
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| (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) \
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| (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) \
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| (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos))
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#define SCL_PIN_UNINIT_CONF SDA_PIN_UNINIT_CONF
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#define SCL_PIN_INIT_CONF_CLR \
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( (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
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| (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
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| (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \
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| (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
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| (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos))
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#define SDA_PIN_INIT_CONF_CLR SCL_PIN_INIT_CONF_CLR
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static nrf_drv_twi_evt_handler_t m_handlers[INSTANCE_COUNT];
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static void * m_contexts[INSTANCE_COUNT];
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static void twi_clear_bus(nrf_drv_twi_config_t const * p_config)
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{
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NRF_GPIO->PIN_CNF[p_config->scl] = SCL_PIN_INIT_CONF;
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NRF_GPIO->PIN_CNF[p_config->sda] = SDA_PIN_INIT_CONF;
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nrf_gpio_pin_set(p_config->scl);
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nrf_gpio_pin_set(p_config->sda);
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NRF_GPIO->PIN_CNF[p_config->scl] = SCL_PIN_INIT_CONF_CLR;
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NRF_GPIO->PIN_CNF[p_config->sda] = SDA_PIN_INIT_CONF_CLR;
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nrf_delay_us(4);
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for (int i = 0; i < 9; i++)
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{
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if (nrf_gpio_pin_read(p_config->sda))
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{
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if (i == 0)
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{
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return;
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}
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else
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{
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break;
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}
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}
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nrf_gpio_pin_clear(p_config->scl);
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nrf_delay_us(4);
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nrf_gpio_pin_set(p_config->scl);
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nrf_delay_us(4);
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}
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nrf_gpio_pin_clear(p_config->sda);
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nrf_delay_us(4);
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nrf_gpio_pin_set(p_config->sda);
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}
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#ifdef TWIM_PRESENT
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static void twim_evt_handler(nrfx_twim_evt_t const * p_event,
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void * p_context)
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{
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uint32_t inst_idx = (uint32_t)p_context;
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nrf_drv_twi_evt_t const event =
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{
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.type = (nrf_drv_twi_evt_type_t)p_event->type,
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.xfer_desc =
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{
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.type = (nrf_drv_twi_xfer_type_t)p_event->xfer_desc.type,
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.address = p_event->xfer_desc.address,
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.primary_length = p_event->xfer_desc.primary_length,
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.secondary_length = p_event->xfer_desc.secondary_length,
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.p_primary_buf = p_event->xfer_desc.p_primary_buf,
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.p_secondary_buf = p_event->xfer_desc.p_secondary_buf,
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}
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};
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m_handlers[inst_idx](&event, m_contexts[inst_idx]);
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}
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#endif // TWIM_PRESENT
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#ifdef TWI_PRESENT
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static void twi_evt_handler(nrfx_twi_evt_t const * p_event,
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void * p_context)
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{
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uint32_t inst_idx = (uint32_t)p_context;
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nrf_drv_twi_evt_t const event =
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{
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.type = (nrf_drv_twi_evt_type_t)p_event->type,
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.xfer_desc =
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{
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.type = (nrf_drv_twi_xfer_type_t)p_event->xfer_desc.type,
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.address = p_event->xfer_desc.address,
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.primary_length = p_event->xfer_desc.primary_length,
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.secondary_length = p_event->xfer_desc.secondary_length,
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.p_primary_buf = p_event->xfer_desc.p_primary_buf,
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.p_secondary_buf = p_event->xfer_desc.p_secondary_buf,
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}
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};
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m_handlers[inst_idx](&event, m_contexts[inst_idx]);
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}
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#endif // TWI_PRESENT
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ret_code_t nrf_drv_twi_init(nrf_drv_twi_t const * p_instance,
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nrf_drv_twi_config_t const * p_config,
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nrf_drv_twi_evt_handler_t event_handler,
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void * p_context)
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{
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uint32_t inst_idx = p_instance->inst_idx;
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m_handlers[inst_idx] = event_handler;
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m_contexts[inst_idx] = p_context;
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if(p_config->clear_bus_init)
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{
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/* Send clocks (max 9) until slave device back from stuck mode */
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twi_clear_bus(p_config);
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}
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ret_code_t result = 0;
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if (NRF_DRV_TWI_USE_TWIM)
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{
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result = nrfx_twim_init(&p_instance->u.twim,
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(nrfx_twim_config_t const *)p_config,
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event_handler ? twim_evt_handler : NULL,
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(void *)inst_idx);
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}
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else if (NRF_DRV_TWI_USE_TWI)
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{
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result = nrfx_twi_init(&p_instance->u.twi,
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(nrfx_twi_config_t const *)p_config,
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event_handler ? twi_evt_handler : NULL,
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(void *)inst_idx);
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}
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return result;
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}
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