47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
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// i2c.h
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// i2c
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//
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// Created by Michael Köhler on 09.10.17.
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//
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//
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#ifndef i2c_h
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#define i2c_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* TODO: setup i2c/twi */
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#define F_I2C 500000UL// clock i2c
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#define PSC_I2C 1 // prescaler i2c
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#define SET_TWBR (F_CPU/F_I2C-16UL)/(PSC_I2C*2UL)
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#include <stdio.h>
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#include <avr/io.h>
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extern uint8_t I2C_ErrorCode; // variable for communication error at twi
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// ckeck it in your code
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// 0 means no error
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// define bits in I2C-ErrorCode:
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#define I2C_START 0 // bit 0: timeout start-condition
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#define I2C_SENDADRESS 1 // bit 0: timeout device-adress
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#define I2C_BYTE 2 // bit 0: timeout byte-transmission
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#define I2C_READACK 3 // bit 0: timeout read acknowledge
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#define I2C_READNACK 4 // bit 0: timeout read nacknowledge
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void i2c_init(void); // init hw-i2c
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void i2c_start(uint8_t i2c_addr); // send i2c_start_condition
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void i2c_stop(void); // send i2c_stop_condition
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void i2c_byte(uint8_t byte); // send data_byte
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uint8_t i2c_readAck(void); // read byte with ACK
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uint8_t i2c_readNAck(void); // read byte with NACK
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#ifdef __cplusplus
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}
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#endif
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#endif /* i2c_h */
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