AVR TWI程序.doc

AVR TWI程序 AVR TWI程序 i2c.h /**************************************************************************** Title : C include file Software: AVR-GCC with AVR-AS Target: any AVR device *****************************************************************************/ #ifndef __I2C_DEV_H #define __I2C_DEV_H #define TWPS0 0 #define TWPS1 1 #define TWEN 2 #define TWIE 0 #define TWEA 6 #define TWINT 7 #define TWSTA 5 #define TWSTO 4 #define TWCR_CMD_MASK 0x0F #define TWSR_STATUS_MASK 0xF8 // return values #define I2C_OK 0x00 #define I2C_ERROR_NODEV 0x01 #define I2C_SEND_DATA_BUFFER_SIZE 0x10 #define I2C_RECEIVE_DATA_BUFFER_SIZE 0x10 //#define F_CPU 8000000 #define TRUE 1 #define FALSE 0 // types typedef enum { I2C_IDLE = 0, I2C_BUSY = 1, I2C_MASTER_TX = 2, I2C_MASTER_RX = 3, I2C_SLAVE_TX = 4, I2C_SLAVE_RX = 5 } eI2cStateType; unsigned char DevNum; void i2cInit(void); void i2cMasterSend(unsigned char deviceAddr, unsigned char length, unsigned char* data); void ClearReceiveBuf(void); #endif /* #ifndef __I2C_DEV_H */ /*######################################################################################################*/ /* T H E E N D */ /*######################################################################################################*/ i2c.c /**************************************************************************** Title : C file for the I2C FUNCTIONS library (i2c.c) Software: AVR-GCC with AVR-AS Target: any AVR device *****************************************************************************/ ＃i nclude avr/io.h ＃i nclude avr/iom16.h ＃i nclude util/twi.h ＃i nclude avr/interrupt.h ＃i nclude unit_main.h ＃i nclude i2c.h // I2C标准波特率: // 低速 100KHz // 高速 400KHz // I2C 状态和地址变量 static volatile eI2cStateType I2cState; static unsigned char I2cDeviceAddrRW; // 发送缓冲区 static unsigne