57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
#ifndef I2C_H
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#define I2C_H
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#include <avr/io.h>
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#include <util/twi.h>
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#define PCA9555_ADDR_OTHER 0b0100111
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#define PCA9555_ADDR_SELF 0b0100000
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#define REG_INPUT_PORT0 0x00
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#define REG_INPUT_PORT1 0x01
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#define REG_OUTPUT_PORT0 0x02
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#define REG_OUTPUT_PORT1 0x03
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#define REG_CONFIG_PORT0 0x06
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#define REG_CONFIG_PORT1 0x07
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#define I2C_CLOCK 100000UL
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#define I2C_ADDR(ADDR, RW) ((ADDR) << 1 | (RW & 1))
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void i2c_init(void);
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void i2c_start(void);
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void i2c_stop(void);
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void i2c_write(uint8_t);
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uint8_t i2c_read_nack(void);
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uint8_t i2c_read_ack(void);
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uint8_t pca9555_read(uint8_t addr, uint8_t reg);
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void pca9555_write(uint8_t addr, uint8_t reg, uint8_t value);
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static inline void pca9555_set_output(uint8_t addr, uint8_t port, uint8_t mask) {
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uint8_t cfg = pca9555_read(addr, port);
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cfg &= ~mask;
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pca9555_write(addr, port, cfg);
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}
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static inline void pca9555_set_low(uint8_t addr, uint8_t port, uint8_t mask) {
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uint8_t out = pca9555_read(addr, port);
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out &= ~mask; // clear bit
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pca9555_write(addr, port, out);
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}
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static inline void pca9555_set_high(uint8_t addr, uint8_t port, uint8_t mask) {
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uint8_t out = pca9555_read(addr, port);
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out |= mask; // set bit;
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pca9555_write(addr, port, out);
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}
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static inline void pca9555_toggle(uint8_t addr, uint8_t port, uint8_t mask) {
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uint8_t out = pca9555_read(addr, port);
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out ^= mask;
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pca9555_write(addr, port, out);
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}
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#endif /* I2C_H */
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