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184 lines
4.5 KiB
184 lines
4.5 KiB
/** @addtogroup i2c_file I2C peripheral API
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*
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* @brief <b>Access functions for the I2C Controller</b>
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*
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* @ingroup peripheral_apis
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* LGPL License Terms @ref lgpl_license
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* @author @htmlonly © @endhtmlonly 2016
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* Maxim Sloyko <maxims@google.com>
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*
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2017-2018 Unicore MX project<dev(at)lists(dot)unicore-mx(dot)org>
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* Copyright (C) 2021 Eduard Drusa <ventyl86(at)netkosice(dot)sk>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/nrf/i2c.h>
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/**@{*/
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/** @brief Enable I2C peripheral
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*
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* @param[in] i2c uint32_t i2c peripheral base
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*/
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void i2c_enable(uint32_t i2c)
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{
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I2C_ENABLE(i2c) = I2C_ENABLE_VALUE;
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}
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/** @brief Disable I2C peripheral
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*
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* @param[in] i2c uint32_t i2c peripheral base
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*/
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void i2c_disable(uint32_t i2c)
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{
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I2C_ENABLE(i2c) = 0;
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}
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/** @brief Start I2C transmission.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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* @param[in] data uint8_t the first byte to send.
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*/
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void i2c_start_tx(uint32_t i2c, uint8_t data)
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{
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PERIPH_TRIGGER_TASK(I2C_TASK_STARTTX(i2c));
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I2C_TXD(i2c) = data;
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}
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/** @brief Start I2C reception.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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*/
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void i2c_start_rx(uint32_t i2c)
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{
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PERIPH_TRIGGER_TASK(I2C_TASK_STARTRX(i2c));
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}
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/** @brief Signal stop on I2C line.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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*/
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void i2c_send_stop(uint32_t i2c)
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{
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PERIPH_TRIGGER_TASK(I2C_TASK_STOP(i2c));
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}
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/** @brief Select Fast (400kHz) mode.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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*/
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void i2c_set_fast_mode(uint32_t i2c)
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{
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I2C_FREQUENCY(i2c) = I2C_FREQUENCY_400K;
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}
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/** @brief Select Standard (100kHz) mode.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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*/
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void i2c_set_standard_mode(uint32_t i2c)
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{
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I2C_FREQUENCY(i2c) = I2C_FREQUENCY_100K;
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}
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/** @brief Set I2C frequency.
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*
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* In addition to Standard (100kHz) and Fast (400kHz) modes
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* this peripheral also supports 250kHz mode.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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* @param[in] freq uint32_t frequency constant. See defines for details
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* and note that this is not actually a frequency in Hz or kHz.
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*/
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void i2c_set_frequency(uint32_t i2c, uint32_t freq)
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{
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I2C_FREQUENCY(i2c) = freq;
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}
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/** @brief Write Data to TXD register to be sent.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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* @param[in] data uint8_t byte to send next.
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*/
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void i2c_send_data(uint32_t i2c, uint8_t data)
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{
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I2C_TXD(i2c) = data;
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}
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/** @brief Read Data from RXD register.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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* @returns uint8_t data from RXD register.
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*/
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uint8_t i2c_get_data(uint32_t i2c)
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{
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return (uint8_t)I2C_RXD(i2c);
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}
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/** @brief Select GPIO pins to be used by this peripheral.
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*
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* This needs to be configured when no transaction is in progress.
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*
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* @param[in] i2c i2c peripheral base.
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* @param[in] scl_pin SCL pin. Use GPIO defines in @ref gpio_pin_id or GPIO_UNCONNECTED
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* if signal shall not be connected to any pin.
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* @param[in] sda_pin SDA pin. Use GPIO defines in @ref gpio_pin_id or GPIO_UNCONNECTED
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* if signal shall not be connected to any pin.
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*/
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void i2c_select_pins(uint32_t i2c, uint32_t scl_pin, uint32_t sda_pin)
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{
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if (scl_pin != GPIO_UNCONNECTED) {
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I2C_PSELSCL(i2c) = __GPIO2PIN(scl_pin);
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} else {
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I2C_PSELSCL(i2c) = scl_pin;
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}
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if (sda_pin != GPIO_UNCONNECTED) {
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I2C_PSELSDA(i2c) = __GPIO2PIN(sda_pin);
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} else {
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I2C_PSELSDA(i2c) = sda_pin;
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}
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}
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/** @brief Set 7bit I2C address of the device you wish to communicate with.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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* @param[in] addr uint8_t device address (7bit).
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*/
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void i2c_set_address(uint32_t i2c, uint8_t addr)
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{
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I2C_ADDRESS(i2c) = addr;
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}
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/** @brief Resume I2C transaction.
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*
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* This function is unusual, but required to implement
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* i2c exchange with this peripheral.
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*
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* @param[in] i2c uint32_t i2c peripheral base.
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*/
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void i2c_resume(uint32_t i2c)
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{
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PERIPH_TRIGGER_TASK(I2C_TASK_RESUME(i2c));
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}
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/**@}*/
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