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/*
* Copyright 2012-2022 Great Scott Gadgets <info@greatscottgadgets.com>
* Copyright 2012 Jared Boone <jared@sharebrained.com>
*
* This file is part of HackRF.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "i2c_lpc.h"
#include <libopencm3/lpc43xx/i2c.h>
/* FIXME return i2c0 status from each function */
void i2c_lpc_start(i2c_bus_t* const bus, const void* const _config)
{
const i2c_lpc_config_t* const config = _config;
const uint32_t port = (uint32_t) bus->obj;
i2c_init(port, config->duty_cycle_count);
}
void i2c_lpc_stop(i2c_bus_t* const bus)
{
const uint32_t port = (uint32_t) bus->obj;
i2c_disable(port);
}
void i2c_lpc_transfer(
i2c_bus_t* const bus,
const uint_fast8_t peripheral_address,
const uint8_t* const data_tx,
const size_t count_tx,
uint8_t* const data_rx,
const size_t count_rx)
{
const uint32_t port = (uint32_t) bus->obj;
size_t i;
bool ack = false;
if (data_tx && (count_tx > 0)) {
i2c_tx_start(port);
i2c_tx_byte(port, (peripheral_address << 1) | I2C_WRITE);
for (i = 0; i < count_tx; i++) {
i2c_tx_byte(port, data_tx[i]);
}
}
if (data_rx && (count_rx > 0)) {
i2c_tx_start(port);
i2c_tx_byte(port, (peripheral_address << 1) | I2C_READ);
for (i = 0; i < count_rx; i++) {
/* ACK each byte except the last */
ack = (i != count_rx - 1);
data_rx[i] = i2c_rx_byte(port, ack);
}
}
i2c_stop(port);
}
bool i2c_probe(i2c_bus_t* const bus, const uint_fast8_t device_address)
{
const uint32_t port = (uint32_t) bus->obj;
i2c_tx_start(port);
i2c_tx_byte(port, (device_address << 1) | I2C_WRITE);
const bool detected = (I2C_STAT(port) == 0x18);
i2c_stop(port);
return detected;
}
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