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