ADS1120: 使用的是ADS1120的 二线制测温原理图

#include "ADS1220.h"
#include "spi.h"
#include "main.h"
#include "math.h"
#include <stdio.h>

#define R_ref 20000
#define ADS1120_MAXCODE 32768

void ADS1220AssertCS(int fAssert)
{
		if (fAssert)
			CLR_CS1; 
		else
			SET_CS1; 
}
void ADS1220SendByte(unsigned char Byte)
{	
	HAL_SPI_Transmit(&hspi2,&Byte,1,10);   
}
unsigned char ADS1220ReceiveByte()
{
	unsigned char SData = 0xff ,Result = 0;

	HAL_SPI_TransmitReceive(&hspi2,&SData,&Result,1,10);

	return Result;
}
/*
******************************************************************************
 higher level functions
*/

void ADS1220ReadRegister(int StartAddress, int NumRegs, unsigned * pData)
{
   int i;
	/* assert CS to start transfer */
	ADS1220AssertCS(1);
 	/* send the command byte */
	ADS1220SendByte(ADS1220_CMD_RREG | (((StartAddress<<2) & 0x0c) |((NumRegs-1)&0x03)));
   	/* get the register content */
	for (i=0; i< NumRegs; i++)
	{
		*pData++ = ADS1220ReceiveByte();
	}
   	/* de-assert CS */
	ADS1220AssertCS(0);
	return;
}
void ADS1220WriteRegister(int StartAddress, int NumRegs, unsigned char * pData)
{
	int i;
   	/* assert CS to start transfer */
	ADS1220AssertCS(1);
   	/* send the command byte */
	ADS1220SendByte(ADS1220_CMD_WREG | (((StartAddress<<2) & 0x0c) |((NumRegs-1)&0x03)));
    /* send the data bytes */
	for (i=0; i< NumRegs; i++)
	{
	ADS1220SendByte(*pData++);
	}
   	/* de-assert CS */
//	HAL_GPIO_WritePin(GPIOB, GPIO_PIN_14, GPIO_PIN_SET);
	ADS1220AssertCS(0);
	return;
}
void ADS1220SendResetCommand()
{
	/* assert CS to start transfer */
	ADS1220AssertCS(1);
   	/* send the command byte */
	ADS1220SendByte(ADS1220_CMD_RESET);
   	/* de-assert CS */
	ADS1220AssertCS(0);
   	return;
}
void ADS1220SendStartCommand()
{
	/* assert CS to start transfer */
	ADS1220AssertCS(1);
    /* send the command byte */
	ADS1220SendByte(ADS1220_CMD_SYNC);
   	/* de-assert CS */
	ADS1220AssertCS(0);
    return;
}
void ADS1220SendShutdownCommand()
{
	/* assert CS to start transfer */
	ADS1220AssertCS(1);
   	/* send the command byte */
	ADS1220SendByte(ADS1220_CMD_SHUTDOWN);
   	/* de-assert CS */
	ADS1220AssertCS(0);
    return;
}

/* ADS1220 Initial Configuration */
void ADS1220Init(void)
{
	uint8_t ch_cfg[4]={ADS1220_MUX_1_0|ADS1220_GAIN_1|ADS1220_PGA_BYPASS, ADS1220_CC|ADS1220_DR_1000, ADS1220_VREF_EX_DED|ADS1220_PSW_SW|ADS1220_IDAC_100|ADS1220_REJECT_BOTH, ADS1220_IDAC1_AIN3|ADS1220_IDAC2_OFF|ADS1220_DRDY_MODE};
//	uint8_t ch_cfg[4]={ADS1220_MUX_0_G|ADS1220_GAIN_1|ADS1220_PGA_BYPASS, ADS1220_CC|ADS1220_DR_20, ADS1220_VREF_INT|ADS1220_PSW_SW|ADS1220_IDAC_OFF, ADS1220_IDAC1_OFF|ADS1220_IDAC2_OFF};

	ADS1220SendResetCommand();//¸´Î»
  HAL_Delay(100);
	ADS1220WriteRegister(ADS1220_0_REGISTER,4,ch_cfg);//ÅäÖÃ4¸ö¼Ä´æÆ÷
	HAL_Delay(100);
	ADS1220SendStartCommand();
}
 
long ADS1220ReadData()
{
	long Data;
//	unsigned int cfg[4];
	/* assert CS to start transfer */

	ADS1220AssertCS(1);

	/* send the command byte */
  ADS1220SendByte(ADS1220_CMD_RDATA);
	/* get the conversion result */
//#ifdef ADS1120
//  ADS1220ReadRegister(ADS1220_0_REGISTER,4,cfg);
	Data = ADS1220ReceiveByte();
	Data = (Data<<8) | ADS1220ReceiveByte();
	/* sign extend data */
//	if (Data & 0x8000)
//		Data |= 0xffff0000;
//#else
//	Data = ADS1220ReceiveByte();
//	Data = (Data << 8) | ADS1220ReceiveByte();
////Data = (Data << 8) | ADS1220ReceiveByte();
//	/* sign extend data */
//	if (Data & 0x8000)
//		Data |= 0xffff0000; 
//#endif
	/* de-assert CS */

	ADS1220AssertCS(0);

	return Data;
}