/** * Copyright (c) 2017 - 2018, 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, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, 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 Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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 "nrf_drv_twi.h" #include #include #ifdef TWIM_PRESENT #define INSTANCE_COUNT TWIM_COUNT #else #define INSTANCE_COUNT TWI_COUNT #endif #define SCL_PIN_INIT_CONF \ ( (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \ | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \ | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \ | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \ | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos)) #define SDA_PIN_INIT_CONF SCL_PIN_INIT_CONF #define SDA_PIN_UNINIT_CONF \ ( (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \ | (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) \ | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) \ | (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) \ | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos)) #define SCL_PIN_UNINIT_CONF SDA_PIN_UNINIT_CONF #define SCL_PIN_INIT_CONF_CLR \ ( (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \ | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \ | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \ | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \ | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos)) #define SDA_PIN_INIT_CONF_CLR SCL_PIN_INIT_CONF_CLR static nrf_drv_twi_evt_handler_t m_handlers[INSTANCE_COUNT]; static void * m_contexts[INSTANCE_COUNT]; static void twi_clear_bus(nrf_drv_twi_config_t const * p_config) { NRF_GPIO->PIN_CNF[p_config->scl] = SCL_PIN_INIT_CONF; NRF_GPIO->PIN_CNF[p_config->sda] = SDA_PIN_INIT_CONF; nrf_gpio_pin_set(p_config->scl); nrf_gpio_pin_set(p_config->sda); NRF_GPIO->PIN_CNF[p_config->scl] = SCL_PIN_INIT_CONF_CLR; NRF_GPIO->PIN_CNF[p_config->sda] = SDA_PIN_INIT_CONF_CLR; nrf_delay_us(4); for (int i = 0; i < 9; i++) { if (nrf_gpio_pin_read(p_config->sda)) { if (i == 0) { return; } else { break; } } nrf_gpio_pin_clear(p_config->scl); nrf_delay_us(4); nrf_gpio_pin_set(p_config->scl); nrf_delay_us(4); } nrf_gpio_pin_clear(p_config->sda); nrf_delay_us(4); nrf_gpio_pin_set(p_config->sda); } #ifdef TWIM_PRESENT static void twim_evt_handler(nrfx_twim_evt_t const * p_event, void * p_context) { uint32_t inst_idx = (uint32_t)p_context; nrf_drv_twi_evt_t const event = { .type = (nrf_drv_twi_evt_type_t)p_event->type, .xfer_desc = { .type = (nrf_drv_twi_xfer_type_t)p_event->xfer_desc.type, .address = p_event->xfer_desc.address, .primary_length = p_event->xfer_desc.primary_length, .secondary_length = p_event->xfer_desc.secondary_length, .p_primary_buf = p_event->xfer_desc.p_primary_buf, .p_secondary_buf = p_event->xfer_desc.p_secondary_buf, } }; m_handlers[inst_idx](&event, m_contexts[inst_idx]); } #endif // TWIM_PRESENT #ifdef TWI_PRESENT static void twi_evt_handler(nrfx_twi_evt_t const * p_event, void * p_context) { uint32_t inst_idx = (uint32_t)p_context; nrf_drv_twi_evt_t const event = { .type = (nrf_drv_twi_evt_type_t)p_event->type, .xfer_desc = { .type = (nrf_drv_twi_xfer_type_t)p_event->xfer_desc.type, .address = p_event->xfer_desc.address, .primary_length = p_event->xfer_desc.primary_length, .secondary_length = p_event->xfer_desc.secondary_length, .p_primary_buf = p_event->xfer_desc.p_primary_buf, .p_secondary_buf = p_event->xfer_desc.p_secondary_buf, } }; m_handlers[inst_idx](&event, m_contexts[inst_idx]); } #endif // TWI_PRESENT ret_code_t nrf_drv_twi_init(nrf_drv_twi_t const * p_instance, nrf_drv_twi_config_t const * p_config, nrf_drv_twi_evt_handler_t event_handler, void * p_context) { uint32_t inst_idx = p_instance->inst_idx; m_handlers[inst_idx] = event_handler; m_contexts[inst_idx] = p_context; if(p_config->clear_bus_init) { /* Send clocks (max 9) until slave device back from stuck mode */ twi_clear_bus(p_config); } ret_code_t result = 0; if (NRF_DRV_TWI_USE_TWIM) { result = nrfx_twim_init(&p_instance->u.twim, (nrfx_twim_config_t const *)p_config, event_handler ? twim_evt_handler : NULL, (void *)inst_idx); } else if (NRF_DRV_TWI_USE_TWI) { result = nrfx_twi_init(&p_instance->u.twi, (nrfx_twi_config_t const *)p_config, event_handler ? twi_evt_handler : NULL, (void *)inst_idx); } return result; }