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NRF5x: I2C EasyDMA support for NRF5x, extended API

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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.
This commit is contained in:
Eduard Drusa
2022-03-31 11:17:59 +02:00
committed by Karl Palsson
parent 458766398f
commit 66bf499e1b
6 changed files with 218 additions and 36 deletions
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2
lib/nrf/52/Makefile
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@@ -37,7 +37,7 @@ ARFLAGS = rcs
OBJS += clock_common.o
OBJS += gpio.o
OBJS += i2c.o
OBJS += i2c.o i2c_common.o
OBJS += ppi.o
OBJS += radio_common.o
OBJS += rtc.o

62
lib/nrf/52/i2c.c Normal file
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@@ -0,0 +1,62 @@
/** @addtogroup i2c_file I2C peripheral API
*/
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2022 Eduard Drusa <ventyl86(at)netkosice(dot)sk>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/nrf/52/i2c.h>
/**@{*/
/** Configure I2C transmit buffer properties
*
* Configures transmit buffer for EasyDMA transaction. This API
* is only available if @ref I2C_MODE_MASTER mode is activated.
*
* Configures linear TX buffer for EasyDMA transmission.
* @param[in] i2c i2c peripheral base, see @ref i2c_block
* @param[in] buffer address of buffer start
* @param[in] len length of data in the buffer
*/
void i2c_set_tx_buffer(uint32_t i2c, const uint8_t *buffer, uint8_t len)
{
I2C_TXDPTR(i2c) = (uint32_t) buffer;
I2C_TXDMAXCNT(i2c) = len;
I2C_TXDLIST(i2c) = 0;
}
/** Configure I2C receive buffer properties
*
* Configures receive buffer for EasyDMA transaction. This API
* is only available if @ref I2C_MODE_MASTER mode is activated.
*
* Configures linear RX buffer for EasyDMA transmission.
* @param[in] i2c i2c peripheral base, see @ref i2c_block
* @param[in] buffer address of buffer start
* @param[in] len length of the buffer
*/
void i2c_set_rx_buffer(uint32_t i2c, uint8_t *buffer, uint8_t len)
{
I2C_RXDPTR(i2c) = (uint32_t) buffer;
I2C_RXDMAXCNT(i2c) = len;
I2C_RXDLIST(i2c) = 0;
}
/** @} */