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This commit is contained in:
UncleRus 2016-03-02 02:17:07 +05:00
parent 875db616ae
commit 03ee667d5d
2 changed files with 27 additions and 26 deletions
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52
extras/pcf8574/pcf8574.c
View file

@ -17,52 +17,52 @@
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;
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;
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;
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;
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;
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();
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);
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);
uint8_t bit = (uint8_t)value << num;
uint8_t mask = ~(1 << num);
pcf8574_port_write (addr, (pcf8574_port_read(addr) & mask) | bit);
}

1
extras/pcf8574/pcf8574.h
View file

@ -14,6 +14,7 @@
*/
/**
* \file Driver for PCF8574 compartible remote 8-bit I/O expanders for I2C-bus
* \author Ruslan V. Uss
*/
#ifndef PCF8574_PCF8574_H_
#define PCF8574_PCF8574_H_