47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
#include "pcf8574.h"
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#include <i2c/i2c.h>
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uint8_t pcf8574_port_read(uint8_t addr)
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{
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uint8_t res;
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if (i2c_slave_read(addr, NULL, &res, 1, false))
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return 0;
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return res;
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}
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size_t pcf8574_port_read_buf(uint8_t addr, void *buf, size_t len)
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{
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if (!len || !buf) return 0;
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uint8_t *_buf = (uint8_t *)buf;
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if (i2c_slave_read(addr, NULL, _buf, len, false))
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return 0;
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return len;
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}
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size_t pcf8574_port_write_buf(uint8_t addr, void *buf, size_t len)
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{
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if (!len || !buf) return 0;
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uint8_t *_buf = (uint8_t *)buf;
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if (i2c_slave_write(addr, NULL, _buf, len, false))
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return 0;
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return len;
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}
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void pcf8574_port_write(uint8_t addr, uint8_t value)
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{
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i2c_slave_write(addr, NULL, &value, 1, false);
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}
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bool pcf8574_gpio_read(uint8_t addr, uint8_t num)
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{
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return (bool)((pcf8574_port_read(addr) >> num) & 1);
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}
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void pcf8574_gpio_write(uint8_t addr, uint8_t num, bool value)
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{
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uint8_t bit = (uint8_t)value << num;
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uint8_t mask = ~(1 << num);
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pcf8574_port_write (addr, (pcf8574_port_read(addr) & mask) | bit);
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}
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