ads1240.h

ADS1240转换程序

#ifndef __ADS1240_H
#define __ADS1240_H

// P3.7
#define ADS1240_DSYNC   0x80
// P3.6
#define ADS1240_PDWN    0x40
// P3.3
#define ADS1240_SCLK    0x08
// P3.5
#define ADS1240_CS      0x20

// GPIO2 (P0) on the port expander
#define CLK_KICK_START_EN   0x01
// GPIO3 (P1) on the port expander
#define ADS1240_BUFEN   0x02

// P3.1
#define ADS1240_DIN     0x02
// P3.2
#define ADS1240_DOUT    0x04

// GPIO2 (P2) on the port extender
#define ADS1240_POL     0x04

// P2.2
#define ADS1240_DRDY    0x04

// GPIO5 (P3) on the port extender
#define ADS1240_RESET   0x08

#define ADS1240_NO_ERROR            0
#define ADS1240_TIMEOUT_WARNING  -10

// define commands (see page 18 in the data sheet
#define ADS1240_CMD_RDATA    0x01
#define ADS1240_CMD_RDATAC   0x03
#define ADS1240_CMD_STOPC    0x0f
#define ADS1240_CMD_RREG     0x10
#define ADS1240_CMD_WREG     0x50
#define ADS1240_CMD_SELFCAL  0xf0
#define ADS1240_CMD_SELFOCAL 0xf1
#define ADS1240_CMD_SELFGCAL 0xf2
#define ADS1240_CMD_SYSOCAL  0xf3
#define ADS1240_CMD_SYSGCAL  0xf4
#define ADS1240_CMD_WAKEUP   0xfb
#define ADS1240_CMD_DSYNC    0xfc
#define ADS1240_CMD_SLEEP    0xfd
#define ADS1240_CMD_RESET    0xfe

// define the ADS1240 register values
#define ADS1240_SETUP_REGISTER   0x00
#define ADS1240_MUX_REGISTER     0x01
#define ADS1240_ACR_REGISTER     0x02
#define ADS1240_ODAC_REGISTER    0x03
#define ADS1240_DIO_REGISTER     0x04
#define ADS1240_DIR_REGISTER     0x05
#define ADS1240_IOCON_REGISTER   0x06
#define ADS1240_OCR0_REGISTER    0x07
#define ADS1240_OCR1_REGISTER    0x08
#define ADS1240_OCR2_REGISTER    0x09
#define ADS1240_FSR0_REGISTER    0x0a
#define ADS1240_FSR1_REGISTER    0x0b
#define ADS1240_FSR2_REGISTER    0x0c
#define ADS1240_DOR0_REGISTER    0x0d
#define ADS1240_DOR1_REGISTER    0x0e
#define ADS1240_DOR2_REGISTER    0x0f

// define multiplexer codes
#define ADS1240_MUXP_AIN0   0x00
#define ADS1240_MUXP_AIN1   0x10
#define ADS1240_MUXP_AIN2   0x20
#define ADS1240_MUXP_AIN3   0x30
#define ADS1240_MUXP_AIN4   0x40
#define ADS1240_MUXP_AIN5   0x50
#define ADS1240_MUXP_AIN6   0x60
#define ADS1240_MUXP_AIN7   0x70
#define ADS1240_MUXP_AINCOM 0x80

#define ADS1240_MUXN_AIN0   0x00
#define ADS1240_MUXN_AIN1   0x01
#define ADS1240_MUXN_AIN2   0x02
#define ADS1240_MUXN_AIN3   0x03
#define ADS1240_MUXN_AIN4   0x04
#define ADS1240_MUXN_AIN5   0x05
#define ADS1240_MUXN_AIN6   0x06
#define ADS1240_MUXN_AIN7   0x07
#define ADS1240_MUXN_AINCOM 0x08

// define gain codes
#define ADS1240_GAIN_1      0x00
#define ADS1240_GAIN_2      0x01
#define ADS1240_GAIN_4      0x02
#define ADS1240_GAIN_8      0x03
#define ADS1240_GAIN_16     0x04
#define ADS1240_GAIN_32     0x05
#define ADS1240_GAIN_64     0x06
#define ADS1240_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 ADS1240Init(void);
int ADS1240WaitForDataReady(int Timeout);
void ADS1240AssertCS(int fAssert);
void ADS1240SendByte();
unsigned char ADS1240ReceiveByte();

// higher level functions
long ADS1240ReadData(int fWaitForDataReady);
int ADS1240ReadRegister(int StartAddress, int NumRegs, unsigned * pData);
int ADS1240WriteRegister(int StartAddress, int NumRegs, unsigned * pData);
int ADS1240SendResetCommand(void);

//
int ADS1240SetChannel(int MuxCode);
int ADS1240SetGain(int GainCode);

#endif