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| /**************************************************************************** |
| Title : C include file for the I2C FUNCTIONS library (i2c.h) |
| Author: Chris efstathiou hendrix@otenet.gr |
| Date: 13/Jul/2002 |
| Software: AVR-GCC with AVR-AS |
| Target: any AVR device |
| Comments: This software is FREE. |
| |
| *****************************************************************************/ |
| |
| |
| #ifndef I2C_H |
| #define I2C_H 1 |
| |
| /*##############################################################################################*/ |
| /* START OF CONFIGURATION BLOCK */ |
| /*##############################################################################################*/ |
| |
| #ifndef F_CPU |
| #define F_CPU 3686400L /* The cpu clock frequency in Hertz (used to calculate time)*/ |
| #endif |
| |
| #define I2C_SDA_PORT D /* The SDA port. Use capital letter (A,B,C,D... etc.) */ |
| #define SDA_PIN 4 /* The SDA port pin */ |
| |
| #define I2C_SCL_PORT D /* The SCL port. Use capital letter (A,B,C,D... etc.) */ |
| #define SCL_PIN 5 /* The SCL port pin */ |
| /* |
| The I2C_DELAY_TIME normally is 5 microseconds for a 100 Khz I2C bus ( (1/100000)/2 ). |
| but due to bus capacitance and device responce time in my application i use 50 microseconds. |
| The I2C_TIMEOUT_TIME is set to whatever is the maximum time you think your device will take |
| to perform the requested task. After that time the i2c_transmit function will return |
| a "I2C_ERROR_DEVICE_NOT_RESPONDING" or "I2C_ERROR_DEVICE_BUSY" error code. |
| */ |
| #define I2C_DELAY_TIME 50 /* in microseconds (max over 1 second) */ |
| #define I2C_TIMEOUT_TIME 1000 /* in microseconds (max over 1 second) */ |
| |
| /*##############################################################################################*/ |
| /* END OF CONFIGURATION BLOCK */ |
| /*##############################################################################################*/ |
| |
| /* Keyword definitions */ |
| |
| #define I2C_READ 1 |
| #define I2C_WRITE 0 |
| |
| #define I2C_QUIT 0 |
| #define I2C_CONTINUE 1 |
| |
| #define I2C_NO_ERROR 0 |
| #define I2C_ERROR_DEVICE_BUSY 1 |
| #define I2C_ERROR_DEVICE_NOT_RESPONDING 2 |
| |
| |
| /* Function Declaration */ |
| |
| extern void i2c_init(void); |
| extern void i2c_start(void); |
| extern void i2c_stop(void); |
| extern unsigned char i2c_transmit(unsigned char data); |
| extern unsigned char i2c_receive(unsigned char ack); |
| |
| |
| |
| /* Macro definitions */ |
| |
| #define I2C_START(ADDRESS) { i2c_start(); i2c_transmit(ADDRESS); } |
| #define I2C_START_TX(ADDRESS) I2C_START(ADDRESS) |
| #define I2C_START_RX(ADDRESS) I2C_START(ADDRESS | I2C_READ) |
| |
| #endif /* #ifndef I2C_H */ |
| /*######################################################################################################*/ |
| /* T H E E N D */ |
| /*######################################################################################################*/ |
| |