MSP430F5529单片机24位AD采样ADS1256串口发送采样数据 -

#include "msp430F5529.h"
#include "ADS1256.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL = BIT3+BIT4;
UCA0CTL1|=UCSWRST;
UCA0CTL1|=UCSSEL_1;
UCA0BR0 = 0x03; // 32kHz/9600=3.41 (see User's Guide)
UCA0BR1 = 0x00; //
UCA0MCTL = UCBRS_3+UCBRF_0; // Modulation UCBRSx=3, UCBRFx=0
UCA0CTL1&=~UCSWRST;
UCA0IE|=UCRXIE;
_EINT();
ADS1256_IO_init();
ADS1256_Init( );
while(1)
{
ADS_sum(ADS1256_MUXP_AIN0 | ADS1256_MUXN_AINCOM);
ADS_sum(ADS1256_MUXP_AIN1 | ADS1256_MUXN_AINCOM);
ADS_sum(ADS1256_MUXP_AIN2 | ADS1256_MUXN_AINCOM);
ADS_sum(ADS1256_MUXP_AIN3 | ADS1256_MUXN_AINCOM);
ADS_sum(ADS1256_MUXP_AIN4 | ADS1256_MUXN_AINCOM);
ADS_sum(ADS1256_MUXP_AIN5 | ADS1256_MUXN_AINCOM);
ADS_sum(ADS1256_MUXP_AIN6 | ADS1256_MUXN_AINCOM);
ADS_sum(ADS1256_MUXP_AIN7 | ADS1256_MUXN_AINCOM);
}
}
// Echo back RXed character, confirm TX buffer is ready first
/*#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
}*/
/*******************ADS1256的模拟SPI设置********************/
unsigned char ADS1256_SPI(unsigned char dat)
{
unsigned char i,r=0;
ADS1256_SCLK_L;
for(i=0;i<8;i++)
{
r = r<< 1; //SOMI接收的数据左移
if(dat & 0x80)
ADS1256_SIMO_H; //高
else //
ADS1256_SIMO_L; //低
//
ADS1256_SCLK_H; //SCK置高 |下
dat =dat << 1; // |降
ADS1256_SCLK_L; //SCK置低 V沿
if(ADS1256_SOMI) //判断接受的数据
r = r | 0x01;
else
r = r & 0xfe;
}
delay_us(100); //延时 t11
return r;
}
/************************************************************/
/*****************ADS1256写寄存器******************************/
void ADS1256_WREG(unsigned char regaddr,unsigned char dat)
{
while(ADS1256_DRDY); //当DRDY为低是才能写寄存器
ADS1256_SPI(ADS1256_CMD_WREG | (regaddr & 0xF)); //WREG指令+地址
ADS1256_SPI(0x00);
ADS1256_SPI(dat); //向ADS1256寄存器写数据
}
/************************************************************/
/*****************ADS1256读数据*******************************/
unsigned long ADS1256_ReadData(void)
{
unsigned char i=0;
unsigned long sum=0;
unsigned long r=0;
while(ADS1256_DRDY); //当DRDY为低是才能写指令
ADS1256_SPI(ADS1256_CMD_SYNC); //ADS1256转换指令
ADS1256_SPI(ADS1256_CMD_WAKEUP); //ADS1256唤醒指令
ADS1256_SPI(ADS1256_CMD_RDATA); //ADS1256转换指令
for(i=0;i<3;i++) //接收数据24位
{
sum = sum << 8;
r = ADS1256_SPI(0x00); //接收数据
sum |= r;
}
return sum; //返回数据
}
/************************************************************/
/********************ADS1256初始化******************************/
void ADS1256_Init(void)
{
// ADS1256_CS_L;
ADS1256_REST_L; //ADS1256复位
delay_ms(2);
ADS1256_REST_H;
ADS1256_WREG(ADS1256_STATUS,0x04); // 高位在前、校准、不使用缓冲
ADS1256_WREG(ADS1256_MUX,0x08); // 初始化端口A0为‘+’，AINCOM位‘-’
ADS1256_WREG(ADS1256_ADCON,0x00); // 放大倍数1
ADS1256_WREG(ADS1256_DRATE,ADS1256_DRATE_5SPS); // 数据5sps
ADS1256_WREG(ADS1256_IO,0x00); // IO状态输入
}
/************************************************************/
/********************ADS转换结果*****************************/
void ADS_sum(unsigned char road)
{
unsigned long results=0;
unsigned long Result_sum=0;
unsigned long fVoltage;
unsigned char i,rod;
ADS1256_WREG(ADS1256_MUX,road); //设置通道
ADS1256_SPI(ADS1256_CMD_SELFCAL); //偏移和增益自动校准
results = ADS1256_ReadData(); //读取AD值，返回24位数据。
Result_sum = results >> 4;
if(Result_sum<0x80000) //测得电压值为正的情况
{
fVoltage=Result_sum*954; //954=2*2.5/2^19*100000000 2.5为基准电压 100000000为为了计算的准确性转换为整形计算
ADS1256_buf[0]=(unsigned char)(fVoltage/100000000);
ADS1256_buf[0]=ADS1256_buf[0]+0x30;
ADS1256_buf[1]='.';
ADS1256_buf[2]=(unsigned char)((fVoltage%100000000)/10000000);
ADS1256_buf[2]=ADS1256_buf[2]+0x30;
ADS1256_buf[3]=(unsigned char)((fVoltage%10000000)/1000000);
ADS1256_buf[3]=ADS1256_buf[3]+0x30;
ADS1256_buf[4]=(unsigned char)(fVoltage%1000000/100000);
ADS1256_buf[4]=ADS1256_buf[4]+0x30;
ADS1256_buf[5]=(unsigned char)(fVoltage%100000/10000);
ADS1256_buf[5]=ADS1256_buf[5]+0x30;
ADS1256_buf[6]=(unsigned char)(fVoltage%10000/1000);
ADS1256_buf[6]=ADS1256_buf[6]+0x30;
ADS1256_buf[7]=(unsigned char)(fVoltage%1000/100);
ADS1256_buf[7]=ADS1256_buf[7]+0x30;
ADS1256_buf[8]='V'; //V
ADS1256_buf[9]=0x20;
}
else //测得电压值为负的情况
{
Result_sum=0xfffff-Result_sum; //取反运算
fVoltage=Result_sum*954; //954=2*2.5/2^19*100000000 2.5为基准电压 100000000为为了计算的准确性转换为整形计算
ADS1256_buf[0]=(unsigned char)(fVoltage/100000000);
ADS1256_buf[0]=ADS1256_buf[0]+0x30;
ADS1256_buf[1]='.';
ADS1256_buf[2]=(unsigned char)((fVoltage%100000000)/10000000);
ADS1256_buf[2]=ADS1256_buf[2]+0x30;
ADS1256_buf[3]=(unsigned char)((fVoltage%10000000)/1000000);
ADS1256_buf[3]=ADS1256_buf[3]+0x30;
ADS1256_buf[4]=(unsigned char)(fVoltage%1000000/100000);
ADS1256_buf[4]=ADS1256_buf[4]+0x30;
ADS1256_buf[5]=(unsigned char)(fVoltage%100000/10000);
ADS1256_buf[5]=ADS1256_buf[5]+0x30;
ADS1256_buf[6]=(unsigned char)(fVoltage%10000/1000);
ADS1256_buf[6]=ADS1256_buf[6]+0x30;
ADS1256_buf[7]=(unsigned char)(fVoltage%1000/100);
ADS1256_buf[7]=ADS1256_buf[7]+0x30;
ADS1256_buf[8]='V'; //V
ADS1256_buf[9]='-';
}
if(road/16 == 0) //本次读取的数据是上一次转换的值
rod = (7 + 0x30); //进行通道-1计算
else
rod = ((road/16 + 0x30) -1);
PutString("第");
PutChar(rod);
PutString("路：");
i=0;
while(i<12)
{
PutChar(ADS1256_buf[i]);
i++;
}
while (!(UCA0IFG&UCTXIFG));
UCA0TXBUF = '\n';
Delays( );
}
/**********************ADS1256_IO初始化****************************/
void ADS1256_IO_init()
{
P2SEL &=~ 0XFF;
P2DIR |= BIT0 + BIT3 + BIT4;
P2DIR &=~ (BIT2 + BIT5);
}
/************************************************************/
/*******************************************
函数名称：PutSting
功能：向PC机发送字符串
参数：ptr--指向发送字符串的指针
返回值：无
********************************************/
void PutString(uchar *ptr)
{
while(*ptr != '\0')
{
while (!(UCA0IFG&UCTXIFG)); // TX缓存空闲？
UCA0TXBUF = *ptr++; // 发送数据
}
while (!(UCA0IFG&UCTXIFG));
UCA0TXBUF = '\n';
}
/*******************************************
函数名称：PutChar
功能：向PC机发送一个字符对应的ASCII码
参数：zifu--发送的字符
返回值：无
********************************************/
void PutChar(uchar zifu)
{
while (!(UCA0IFG&UCTXIFG));
UCA0TXBUF = zifu;
}
/*******************************************
函数名称：Delays
功能：延时一会
参数：无
返回值：无
********************************************/
void Delays(void)
{
uchar i=20;
uint j;
while(i--)
{
j=2000;
while(j--);
}
}

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