66bf499e1b
This commit adds support for NRF52 TWI Master mode and slightly extends existing I2C API. This is a breaking change, while mode selection needs to be done during enabling I2C. There is one additional breaking change done because: 1) Unicore MX API design was PITA for writes 2) It is incompatible with EasyDMA I strongly apologize to all two users who might be affected by this change.
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/** @addtogroup i2c_file I2C peripheral API
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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) 2022 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/52/i2c.h>
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/**@{*/
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/** Configure I2C transmit buffer properties
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*
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* Configures transmit buffer for EasyDMA transaction. This API
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* is only available if @ref I2C_MODE_MASTER mode is activated.
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*
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* Configures linear TX buffer for EasyDMA transmission.
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* @param[in] i2c i2c peripheral base, see @ref i2c_block
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* @param[in] buffer address of buffer start
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* @param[in] len length of data in the buffer
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*/
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void i2c_set_tx_buffer(uint32_t i2c, const uint8_t *buffer, uint8_t len)
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{
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I2C_TXDPTR(i2c) = (uint32_t) buffer;
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I2C_TXDMAXCNT(i2c) = len;
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I2C_TXDLIST(i2c) = 0;
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}
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/** Configure I2C receive buffer properties
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*
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* Configures receive buffer for EasyDMA transaction. This API
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* is only available if @ref I2C_MODE_MASTER mode is activated.
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*
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* Configures linear RX buffer for EasyDMA transmission.
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* @param[in] i2c i2c peripheral base, see @ref i2c_block
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* @param[in] buffer address of buffer start
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* @param[in] len length of the buffer
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*/
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void i2c_set_rx_buffer(uint32_t i2c, uint8_t *buffer, uint8_t len)
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{
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I2C_RXDPTR(i2c) = (uint32_t) buffer;
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I2C_RXDMAXCNT(i2c) = len;
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I2C_RXDLIST(i2c) = 0;
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}
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/** @} */
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