STM32 对ADS1255的初始配置，源代码如下：
#include "math.h"
#include "misc.h"
/*Registers' Address*/
#define REG_STATUS 0
#define REG_MUX 1
#define REG_ADCON 2
#define REG_DRATE 3
#define REG_IO 4
#define REG_OFC0 5
#define REG_OFC1 6
#define REG_OPC2 7
#define REG_FSC0 8
#define REG_FSC1 9
#define REG_FSC2 10
#define ADS1255_STATUS 0x00 //状态寄存器(ADDRESS 00h)
#define ADS1255_MUX 0x01 //模拟多路选择控制器(Address 01h)
#define ADS1255_ADCON 0x02 //AD控制寄存器 (Address 02h)
#define ADS1255_DRATE 0x03 //AD数据速度寄存器(Address 03h)
#define ADS1255_IO 0x04 //i/o控制寄存器(Address 04H)
#define ADS1255_OFC0 0x05 //Offset Calibration Byte 0, least significant byte (Address 05h)
#define ADS1255_OFC1 0x06 //Offset Calibration Byte 1 (Address 06h)
#define ADS1255_OFC2 0x07 //Offset Calibration Byte 2, most significant byte (Address 07h)
#define ADS1255_FSC0 0x08 //Full.scale Calibration Byte 0, least significant byte (Address 08h)
#define ADS1255_FSC1 0x09 //Full.scale Calibration Byte 1 (Address 09h)
#define ADS1255_FSC2 0x0a //Full.scale Calibration Byte 2, most significant byte (Address 0Ah)
/*Operation Command*/
//#define ADS1255_WAKEUP 0x00 //Completes SYNC and Exits Standby Mode
#define ADS1255_RDATA 0x01 //单次读取数据
#define ADS1255_RDATAC 0x03 //连续读取数据
#define ADS1255_SDATAC 0x0f //停止连续读数据
#define ADS1255_RREG 0x10 //从寄存器中读取数据Read from REG rrr 0001 rrrr (1xh) 0000 nnnn
#define ADS1255_WREG 0x50 //向寄存器中写入数据Write to REG rrr 0101 rrrr (5xh) 0000 nnnn
#define ADS1255_SELFCAL 0xf0 //补偿和增益自我校准Offset and Gain Self-Calibration
#define ADS1255_SELFOCAL 0xf1 //补偿自我校准Offset Self-Calibration
#define ADS1255_SELFGCAL 0xf2 //增益自我校准Gain Self-Calibration
#define ADS1255_SYSOCAL 0xf3 //系统补偿校准System Offset Calibration
#define ADS1255_SYSGCAL 0xf4 //系统增益校准System Gain Calibration
#define ADS1255_SYNC 0xfc //使ad转换同步Synchronize the A/D Conversion
#define ADS1255_STANDBY 0xfd //启动待机模式Begin Standby Mode
#define ADS1255_RESET 0xfe //重置升高值Reset to Power-Up Values
#define ADS1255_WAKEUP 0xff //结束退出待机模式Completes SYNC and Exits Standby Mode
#define ADS1255_DRDY GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_11)
#define SetADS1255_OUT GPIO_ResetBits(GPIOA,GPIO_Pin_9) //0
#define SetADS1255_IN GPIO_ResetBits(GPIOA,GPIO_Pin_10)
#define SetADS1255_DRDY GPIO_ResetBits(GPIOA,GPIO_Pin_11)
#define SetADS1255_CLK GPIO_ResetBits(GPIOB,GPIO_Pin_5)
#define SetADS1255_CS GPIO_ResetBits(GPIOA,GPIO_Pin_8)
#define ClrADS1255_OUT GPIO_SetBits(GPIOA,GPIO_Pin_9) //1
#define ClrADS1255_IN GPIO_SetBits(GPIOA,GPIO_Pin_10)
#define ClrADS1255_DRDY GPIO_SetBits(GPIOA,GPIO_Pin_11)
#define ClrADS1255_CLK GPIO_SetBits(GPIOB,GPIO_Pin_5)
#define ClrADS1255_CS GPIO_SetBits(GPIOA,GPIO_Pin_8)
#include "ADS1255.h"
#include "math.h"
#include "misc.h"
#include "mmc_sd.h"
#include "stm32f10x_gpio.h"
#define uchar unsigned char
#define uint unsigned int
float snow,snow1;
uchar date1,date2,date3;
uchar date4,date5,date6,date7,date8,date9;
unsigned long snow2,snow3,snow4,snow5,snow6;
void PORT_Init (void);
char Read_Register(char Addr);
void Write_Register(char Addr,char data);
void MYADS1255_write_reg(uchar ADS1255_command,uchar ADS1255_data);
uchar MYADS1255_read_reg(uchar ADS1255_command);
void ADS1255_write_bit(uchar temp);
uchar ADS1255_read_bit(void);
void MYADS1255_RDATAC(void);
void delayus(uchar i);
void delayms(uchar k);
void delayad(void);
void MYADS1255_SELFCAL(void);
void MYADS1255_init(void);
void MYADS1255_out_reg(void);
void MYADS1255_write_reg(uchar ADS1255_command,uchar ADS1255_data);
/****************************************
功能描述:微秒可控延时
设计人:孙占山
说明:进行微秒延时,注意while(--i),不能为while(i--)
*****************************************/
void delayus(uchar i)
{
while(--i);
}
/****************************************
功能描述:毫可控秒延时
设计人:孙占山
说明:进行毫秒延时,可以改变时间
*****************************************/
void delayms(uchar k)
{
uchar i,j;
for(i=0;i<k;i++)
for(j=0;j<248;j++);
}
void delayad(void)
{
unsigned long i = 10;
while(i--);
}
void ADS1255_write_bit(uchar temp)
{
uchar i,j;
SetADS1255_CLK;
for(i=0;i<8;i++)
{
SetADS1255_CLK;
delayus(1);
ClrADS1255_CLK;
delayus(1);
j=( (temp&0x80)>>7 );
GPIO_WriteBit( GPIOA , GPIO_Pin_9 ,j ); //在下降沿的时候写入数据//GPIO_Write
delayus(1);
SetADS1255_CLK;
delayus(1);
temp=temp<<1;
}
}
/****************************************
功能描述:ADS1255单字节读出
设计人:孙占山
说明:上升沿读出数据,在SCLK由0变为1时数据输出,并且保持到下一个上升沿,等到SCLK=1以后,数据稳定了
再读出数据,因为在下一个上升沿时数据才会变化,所以可以等到SCLK=0时读出数据(因为这是的数值比较稳定)
*****************************************/
uchar ADS1255_read_bit(void)
{
uchar i;
uchar date;
SetADS1255_CLK;
ClrADS1255_IN;
for(i=0;i<8;i++)
{
date=date<<1;
SetADS1255_CLK;
delayus(1);
ClrADS1255_CLK;
delayus(1);
date=date|GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_10);//数据在上升沿输出,但是读的时候在SCLK=1后面到下个SCLK=1之前读出便可
delayus(1);
SetADS1255_CLK;
}
return date;
}
/****************************************
功能描述:ADS1255寄存器设置初始化
设计人:孙占山
说明:1:自校准可以通过写STATUS寄存器的ACAL位,还可以通过写SELFCAL命令来自校准
2:使能自校准,在写寄存器ADCON(PGA),DRATE(DR),STATUS(BUFEN)自动校准
3:在STATUS(BUFEN)与ACAL(自校准)位一起使能时,读出校准寄存器有错
*****************************************/
void MYADS1255_init(void)
{
while(ADS1255_DRDY==0);
MYADS1255_write_reg(ADS1255_STATUS,0xf4);//f4
delayus(1);
//while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_11)==1);
//MYADS1255_write_reg(0x50,0x02); //写在STATUS(BUFEN)寄存器使能在BUFEN
//delayus(1);
while(ADS1255_DRDY==0);
MYADS1255_write_reg(ADS1255_MUX,0x01); //08
delayus(1);
while(ADS1255_DRDY==0);
MYADS1255_write_reg(ADS1255_ADCON,0x20);
delayus(1);
while(ADS1255_DRDY==0);
MYADS1255_write_reg(ADS1255_DRATE,0xf0);
delayus(1);
while(ADS1255_DRDY==0);
MYADS1255_write_reg(ADS1255_IO,0x00);
delayus(1);
}
void MYADS1255_out_reg(void)
{
while(ADS1255_DRDY==1);
date4=MYADS1255_read_reg(0x15);
while(ADS1255_DRDY==1);
date5=MYADS1255_read_reg(0x16);
while(ADS1255_DRDY==1);
date6=MYADS1255_read_reg(0x17);
while(ADS1255_DRDY==1);
date7=MYADS1255_read_reg(0x18);
while(ADS1255_DRDY==1);
date8=MYADS1255_read_reg(0x19);
while(ADS1255_DRDY==1);
date9=MYADS1255_read_reg(0x1a);
}
/****************************************
功能描述:ADS1255写寄存器
设计人:孙占山
说明:根据要求写入寄存器和命令字
*****************************************/
void MYADS1255_write_reg(uchar ADS1255_command,uchar ADS1255_data)
{
ADS1255_write_bit(ADS1255_command);
ADS1255_write_bit(0x00); //ADS1255_Write_Byte(0x00);
ADS1255_write_bit(ADS1255_data);
delayms(248);
}
/****************************************
功能描述:ADS1255读寄存器
设计人:孙占山
说明:根据要求写入寄存器和命令字
*****************************************/
uchar MYADS1255_read_reg(uchar ADS1255_command)
{
uchar reg_date;
ADS1255_write_bit(ADS1255_command);
ADS1255_write_bit(0x00); //ADS1255_Write_Byte(0x00);
delayus(50);
reg_date=ADS1255_read_bit();
return reg_date;
}
/****************************************
功能描述:ADS1255唤醒
设计人:孙占山
说明:唤醒待机和同步
*****************************************/
void MYADS1255_WAKEUP(void)
{
ADS1255_write_bit(0x00);
}
/****************************************
功能描述:ADS1255读一次数据命令
设计人:孙占山
说明:在DRDY为低时读出一个数据
*****************************************/
void MYADS1255_RDATA(void)
{
ADS1255_write_bit(0x01);
}
/****************************************
功能描述:ADS1255连续数据命令
设计人:孙占山
说明:在DRDY为低时连续读出数据
*****************************************/
void MYADS1255_RDATAC(void)
{
ADS1255_write_bit(0x03);
}
/****************************************
功能描述:ADS1255停止连续数据命令
设计人:孙占山
说明:在ADS1255连续输出24位当中的任何八位时写入,停止连续读数据
*****************************************/
void MYADS1255_SDATAC(void)
{
ADS1255_write_bit(0x0F);
}
/****************************************
功能描述:偏移和增益自校准
设计人:孙占山
说明:偏移和增益自校准,也可以用STATUS寄存器中的ACAL来自校准
*****************************************/
void MYADS1255_SELFCAL(void)
{
ADS1255_write_bit(0xf0);
}
/****************************************
功能描述:同步
设计人:孙占山
说明:同步用在命令的开始快速执行,紧接着用WAKE UP命令进行同步
*****************************************/
void MYADS1255_SYNC(void)
{
ADS1255_write_bit(0xfc);
}
/****************************************
功能描述:复位
设计人:孙占山
说明:复位后不管ACAL位如何,都执行一个自校准
*****************************************/
void MYADS1255_RESET(void)
{
ADS1255_write_bit(0xfe);
}
/****************************************
功能描述:ADS1255的24位数据分三次读出
设计人:孙占山
说明:1:ADS1255是24位的AD转换器,24位数据可以分三个八位读出,然后再经过公式算出结果
2:公式有两种,一种是左移右移,一种是date1*65536+snow2*256+snow3
3:注意公式左移时不好,因为左移有进位,这样可能数据会变化,一般尽量采取右移
*****************************************/
float MYADS1255_read(void)
{
date1=ADS1255_read_bit();
date2=ADS1255_read_bit();
date3=ADS1255_read_bit();
//snow=((((snow|date1)<<8)|date2)<<8)|date3;
//snow=snow<<8;
snow=date1*65536+date2*256+date3;
return snow;
}
配置与时序都是照着说明写的，请问哪里还有问题，数据一直采集不对。（自认为可能是配置的问题）。
请技术人员帮下忙看下，我在这里卡住有段时间了，初学者，能力有限了。
