ad7705源程序(国外英文资料).doc

ad7705源程序(国外英文资料) AD7705 source AD7705 head file #ifndef _AD7705_H #define _AD7705_H Communication / register address definition #define WR_SETUP_REG 0x10 / / select write register #define RD_SETUP_REG 0x18 / / select write register #define WR_CLOCK_REG 0x20 / / select write clock register #define RD_DATA_REG 0x38 / / selected data register read #define WR_OFFSET_REG 0x60 / / offset write select register #define RD_OFFSET_REG 0x68 / / offset read select register #define WR_FULL_REG 0x70 full scale / / select write register #define RD_FULL_REG 0x78 full scale / / select read register #define SYS_ZERO_CALI 0x80 / / system zero calibration mode #define SYS_FULL_CALI 0xC0 / / system full scale calibration mode #define ZERO_CALIBRATION / / 0x00 system zero calibration #define FULL_CALIBRATION / / 0x01 full scale calibration system //CLOCK register setting with no frequency division, 50HZ output update rate #define CLOCK_REG_SET 0X04 / / function declaration Void reset_AD7705 (void); Unsigned char read_AD7705_byte (void); Unsigned int read_AD7705_word (void); Unsigned, long, int, read_AD7705_dword (void); Void write_AD7705_byte (unsigned, char, data); Void write_AD7705_word (unsigned, int, data); Void write_AD7705_dword (unsigned, long, int, data); Void ReadData7705 (unsigned, int, *const, pdata); Void AD7705_calibration (void); Void start_AD7705 (void); #endif The main AD7705 file #include util/delay.h #include avr/eeprom.h #include ad7705.h #include main.h #include crc16.h #include Usart.h Set the content for the four / range register / / (1) for unipolar V input 0-5V, 0-20mA, 0-10V level of the three input range, the range of 0-2V, no polarity, gain is 1, --0-2V buffer mode / / (2) for bipolar V level input +-2.5V, +-5V the two range, the input range is +-1V, bipolar, --+-2V buffer mode gain of 2. / / (3) for double precision mV level input +-500mV, the gain is 4, bipolar, --+-2V buffer mode / / (4) of double precision mV level +-50mV, the gain is 32, bipolar, --+-1.6V