69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
|
|
* This program 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 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 Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include "pcf8574.h"
|
|
#include <i2c/i2c.h>
|
|
|
|
uint8_t pcf8574_port_read(uint8_t addr)
|
|
{
|
|
i2c_start();
|
|
uint8_t res = i2c_write((addr << 1) | 1) ? i2c_read(1) : 0;
|
|
i2c_stop();
|
|
return res;
|
|
}
|
|
|
|
size_t pcf8574_port_read_buf(uint8_t addr, void *buf, size_t len)
|
|
{
|
|
if (!len || !buf) return 0;
|
|
uint8_t *_buf = (uint8_t *)buf;
|
|
|
|
i2c_start();
|
|
if (!i2c_write((addr << 1) | 1)) return 0;
|
|
for (size_t i = 0; i < len; i++)
|
|
*_buf++ = i2c_read(i == len - 1);
|
|
i2c_stop();
|
|
return len;
|
|
}
|
|
|
|
size_t pcf8574_port_write_buf(uint8_t addr, void *buf, size_t len)
|
|
{
|
|
if (!len || !buf) return 0;
|
|
uint8_t *_buf = (uint8_t *)buf;
|
|
|
|
i2c_start();
|
|
if (!i2c_write(addr << 1)) return 0;
|
|
for (size_t i = 0; i < len; i++)
|
|
i2c_write(*_buf++);
|
|
return len;
|
|
}
|
|
|
|
void pcf8574_port_write(uint8_t addr, uint8_t value)
|
|
{
|
|
i2c_start();
|
|
if (i2c_write(addr << 1)) i2c_write(value);
|
|
i2c_stop();
|
|
}
|
|
|
|
bool pcf8574_gpio_read(uint8_t addr, uint8_t num)
|
|
{
|
|
return (bool)((pcf8574_port_read(addr) >> num) & 1);
|
|
}
|
|
|
|
void pcf8574_gpio_write(uint8_t addr, uint8_t num, bool value)
|
|
{
|
|
uint8_t bit = (uint8_t)value << num;
|
|
uint8_t mask = ~(1 << num);
|
|
pcf8574_port_write (addr, (pcf8574_port_read(addr) & mask) | bit);
|
|
}
|