You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
//
|
|
// i2c.h
|
|
// i2c
|
|
//
|
|
// Created by Michael Köhler on 09.10.17.
|
|
//
|
|
//
|
|
|
|
#ifndef i2c_h
|
|
#define i2c_h
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* TODO: setup i2c/twi */
|
|
#define F_I2C 100000UL// clock i2c
|
|
#define PSC_I2C 1 // prescaler i2c
|
|
#define SET_TWBR (F_CPU/F_I2C-16UL)/(PSC_I2C*2UL)
|
|
|
|
#include <stdio.h>
|
|
#include <avr/io.h>
|
|
|
|
extern uint8_t I2C_ErrorCode; // variable for communication error at twi
|
|
// ckeck it in your code
|
|
// 0 means no error
|
|
// define bits in I2C-ErrorCode:
|
|
#define I2C_START 0 // bit 0: timeout start-condition
|
|
#define I2C_SENDADRESS 1 // bit 0: timeout device-adress
|
|
#define I2C_BYTE 2 // bit 0: timeout byte-transmission
|
|
#define I2C_READACK 3 // bit 0: timeout read acknowledge
|
|
#define I2C_READNACK 4 // bit 0: timeout read nacknowledge
|
|
|
|
void i2c_init(void); // init hw-i2c
|
|
void i2c_start(uint8_t i2c_addr); // send i2c_start_condition
|
|
void i2c_stop(void); // send i2c_stop_condition
|
|
void i2c_byte(uint8_t byte); // send data_byte
|
|
|
|
uint8_t i2c_readAck(void); // read byte with ACK
|
|
uint8_t i2c_readNAck(void); // read byte with NACK
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* i2c_h */
|