ads1241.h

MSP430单片机C语言应用程序设计实例精讲（秦龙编著）

// P3.3
#define ADS1241_SCLK    0x08
// P3.0
#define ADS1241_CS      0x00
// P3.1
#define ADS1241_DIN     0x02
// P3.2
#define ADS1241_DOUT    0x04

// P1.0
#define ADS1241_DRDY    0x00


#define ADS1241_NO_ERROR            0
#define ADS1241_TIMEOUT_WARNING  -10

// define commands
#define ADS1241_CMD_RDATA    0x01
#define ADS1241_CMD_RDATAC   0x03
#define ADS1241_CMD_STOPC    0x0f
#define ADS1241_CMD_RREG     0x10
#define ADS1241_CMD_WREG     0x50
#define ADS1241_CMD_SELFCAL  0xf0
#define ADS1241_CMD_SELFOCAL 0xf1
#define ADS1241_CMD_SELFGCAL 0xf2
#define ADS1241_CMD_SYSOCAL  0xf3
#define ADS1241_CMD_SYSGCAL  0xf4
#define ADS1241_CMD_WAKEUP   0xfb
#define ADS1241_CMD_DSYNC    0xfc
#define ADS1241_CMD_SLEEP    0xfd
#define ADS1241_CMD_RESET    0xfe

// define the ADS1241 register values
#define ADS1241_SETUP_REGISTER   0x00
#define ADS1241_MUX_REGISTER     0x01
#define ADS1241_ACR_REGISTER     0x02
#define ADS1241_ODAC_REGISTER    0x03
#define ADS1241_DIO_REGISTER     0x04
#define ADS1241_DIR_REGISTER     0x05
#define ADS1241_IOCON_REGISTER   0x06
#define ADS1241_OCR0_REGISTER    0x07
#define ADS1241_OCR1_REGISTER    0x08
#define ADS1241_OCR2_REGISTER    0x09
#define ADS1241_FSR0_REGISTER    0x0a
#define ADS1241_FSR1_REGISTER    0x0b
#define ADS1241_FSR2_REGISTER    0x0c
#define ADS1241_DOR0_REGISTER    0x0d
#define ADS1241_DOR1_REGISTER    0x0e
#define ADS1241_DOR2_REGISTER    0x0f

// define multiplexer codes
#define ADS1241_MUXP_AIN0   0x00
#define ADS1241_MUXP_AIN1   0x10
#define ADS1241_MUXP_AIN2   0x20
#define ADS1241_MUXP_AIN3   0x30
#define ADS1241_MUXP_AIN4   0x40
#define ADS1241_MUXP_AIN5   0x50
#define ADS1241_MUXP_AIN6   0x60
#define ADS1241_MUXP_AIN7   0x70
#define ADS1241_MUXP_AINCOM 0x80

#define ADS1241_MUXN_AIN0   0x00
#define ADS1241_MUXN_AIN1   0x01
#define ADS1241_MUXN_AIN2   0x02
#define ADS1241_MUXN_AIN3   0x03
#define ADS1241_MUXN_AIN4   0x04
#define ADS1241_MUXN_AIN5   0x05
#define ADS1241_MUXN_AIN6   0x06
#define ADS1241_MUXN_AIN7   0x07
#define ADS1241_MUXN_AINCOM 0x08

// define gain codes
#define ADS1241_GAIN_1      0x00
#define ADS1241_GAIN_2      0x01
#define ADS1241_GAIN_4      0x02
#define ADS1241_GAIN_8      0x03
#define ADS1241_GAIN_16     0x04
#define ADS1241_GAIN_32     0x05
#define ADS1241_GAIN_64     0x06
#define ADS1241_GAIN_128    0x07

// define ACR register bits
#define N_DRDY_BIT          0x80
#define U_N_B_BIT           0x40
#define SPEED_BIT           0x20
#define BUFEN_BIT           0x10
#define BIT_ORDER_BIT       0x08
#define RANGE_BIT           0x04
#define DR_1_BIT            0x02
#define DR_0_BIT            0x01

// low level functions
int ADS1241Init(void);
int ADS1241WaitForDataReady(int Timeout);
void ADS1241AssertCS(int fAssert);
void ADS1241SendByte();
unsigned char ADS1241ReceiveByte();

// higher level functions
long ADS1241ReadData(int fWaitForDataReady);
int ADS1241ReadRegister(int StartAddress, int NumRegs, unsigned int * pData);
int ADS1241WriteRegister(int StartAddress, int NumRegs, unsigned int *pData);
int ADS1241SendResetCommand(void);
int ADS1241SetChannel(int MuxCode);
int ADS1241SetGain(int GainCode);
void Init_CLK(void);