2 * Author: Brendan Le Foll
3 * Copyright (c) 2014 Intel Corporation.
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6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
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10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 maa_i2c_context* dev = (maa_i2c_context*) malloc(sizeof(maa_i2c_context));
35 // Galileo only has one I2C master which should be /dev/i2c-0
36 // reliability is a fickle friend!
37 if ((dev->fh = open("/dev/i2c-0", O_RDWR)) < 1) {
38 fprintf(stderr, "Failed to open requested i2c port");
44 maa_i2c_frequency(maa_i2c_context* dev, int hz)
50 maa_i2c_receive(maa_i2c_context* dev)
56 maa_i2c_read(maa_i2c_context* dev, char *data, int length)
58 // this is the read(3) syscall not maa_i2c_read()
59 if (read(dev->fh, data, length) == length) {
66 maa_i2c_read_byte(maa_i2c_context* dev)
69 byte = i2c_smbus_read_byte(dev->fh);
77 maa_i2c_write(maa_i2c_context* dev, const char* data, int length)
79 if (i2c_smbus_write_i2c_block_data(dev->fh, data[0], length-1, (uint8_t*) data+1) < 0) {
80 fprintf(stderr, "Failed to write to I2CSlave slave\n");
87 maa_i2c_write_byte(maa_i2c_context* dev, int data)
89 if (i2c_smbus_write_byte(dev->fh, data) < 0) {
90 fprintf(stderr, "Failed to write to I2CSlave slave\n");
97 maa_i2c_address(maa_i2c_context* dev, int addr)
100 if (ioctl(dev->fh, I2C_SLAVE_FORCE, addr) < 0) {
101 fprintf(stderr, "Failed to set slave address %d\n", addr);
106 maa_i2c_stop(maa_i2c_context* dev)