1 /*
2 * Copyright 2012 Michael Ossmann <mike@ossmann.com>
3 * Copyright 2012 Jared Boone <jared@sharebrained.com>
4 *
5 * This file is part of HackRF.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #include "i2c_lpc.h"
24
25 #include <libopencm3/lpc43xx/i2c.h>
26
27 /* FIXME return i2c0 status from each function */
28
i2c_lpc_start(i2c_bus_t * const bus,const void * const _config)29 void i2c_lpc_start(i2c_bus_t* const bus, const void* const _config) {
30 const i2c_lpc_config_t* const config = _config;
31
32 const uint32_t port = (uint32_t)bus->obj;
33 i2c_init(port, config->duty_cycle_count);
34 }
35
i2c_lpc_stop(i2c_bus_t * const bus)36 void i2c_lpc_stop(i2c_bus_t* const bus) {
37 const uint32_t port = (uint32_t)bus->obj;
38 i2c_disable(port);
39 }
40
i2c_lpc_transfer(i2c_bus_t * const bus,const uint_fast8_t slave_address,const uint8_t * const data_tx,const size_t count_tx,uint8_t * const data_rx,const size_t count_rx)41 void i2c_lpc_transfer(i2c_bus_t* const bus,
42 const uint_fast8_t slave_address,
43 const uint8_t* const data_tx, const size_t count_tx,
44 uint8_t* const data_rx, const size_t count_rx
45 ) {
46 const uint32_t port = (uint32_t)bus->obj;
47 i2c_tx_start(port);
48 i2c_tx_byte(port, (slave_address << 1) | I2C_WRITE);
49 for(size_t i=0; i<count_tx; i++) {
50 i2c_tx_byte(port, data_tx[i]);
51 }
52
53 if( data_rx ) {
54 i2c_tx_start(port);
55 i2c_tx_byte(port, (slave_address << 1) | I2C_READ);
56 for(size_t i=0; i<count_rx; i++) {
57 data_rx[i] = i2c_rx_byte(port);
58 }
59 }
60
61 i2c_stop(port);
62 }
63