ADS1110用了一下午的时间终于搞定了

张衍波 · 发表于 2015-10-8 07:41:39

今天把在TI申请的样片ADS1110焊接上，开始从头开始写测试程序，
一边看数据手册一边写，写完了在对照逻辑分析仪，验证自己的时序，今天太幸运了，一步到位搞定了。我用的芯片是000地址的。这个一定要注意哦。
测试了芯片数据稳定性，觉得这个芯片很完美，1倍放大15sps速度  16bit数据很稳定。
写这篇文章的目的是回报阿莫论坛的无私精神。希望更多的莫友发表自己的成果，给正在挣扎的朋友一点帮助，
下面我用的是STM32F205芯片读取的，废话少说，上代码
/**
  ******************************************************************************
  * @File                               :ADS1110.c
  * @Author                               :Flame
  * @Email                               :zhcj66@163.com
  * @Version                      :V1.0.0
  * @FileNewDate             :2013-04-20
  * @FileChangeDate             :2013-04-20
  * @Brief                               :16Bit_AD,自带2.048V ±.05%的电压基准,采样率:15/30/60/240sps;放大倍数:1/2/4/8
                                             :2013-04-20程序测试成功
  ******************************************************************************
  */
#include "includes.h"

#define ADS1110_SCL_CLR() GPIO_ResetBits(GPIOC,GPIO_Pin_7);
#define ADS1110_SCL_SET() GPIO_SetBits(GPIOC,GPIO_Pin_7);

#define ADS1110_SDA_CLR() GPIO_ResetBits(GPIOC,GPIO_Pin_8);
#define ADS1110_SDA_SET() GPIO_SetBits(GPIOC,GPIO_Pin_8);
#define ADS1110_SDA_Get() GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_8)

#define ADS1110Addr                                     0x90                      //ADS1110地址
#define ADS1110ReadAddr                               ADS1110Addr+1       //ADS1110读地址
#define ADS1110WriteAddr                      ADS1110Addr+0       //ADS1110写地址
#define ADS1110Reg                                     0x0C                      //连续,15sps,1倍

void ADS1110_GPIO_In(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
      GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void ADS1110_GPIO_Out(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void ADS1110_GPIO_Configuration(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOC, &GPIO_InitStructure);

      ADS1110_GPIO_Out();
}

void ADS1110_Delays(unsigned int count)//6us
{
      uint16_t i,j;
      for(i=count;i>0;i--)
            for(j=12;j>0;j--);
}

void ADS_delay(void)
{
  unsigned char i;
  for(i=0;i<5;i++);
}

void ADS1110_Start(void)
{
      ADS1110_GPIO_Out();

      ADS1110_SDA_SET();
      ADS1110_SCL_SET();
      ADS1110_Delays(1);
      ADS1110_SDA_CLR();
      ADS1110_Delays(1);
      ADS1110_SCL_CLR();
}

void ADS1110_Stop(void)
{
      ADS1110_GPIO_Out();

      ADS1110_SDA_CLR();
      ADS1110_SCL_CLR();
      ADS1110_Delays(1);
      ADS1110_SCL_SET();
      ADS1110_Delays(1);
      ADS1110_SDA_SET();
      ADS1110_Delays(1);
}

//等待应答信号到来       返回值：1，接收应答失败 ;0，接收应答成功
unsigned char ADS1110_Wait_Ack(void)
{
      u8 ucErrTime=0;
      ADS1110_GPIO_In();    //SDA设置为输入
      ADS1110_SDA_SET();
      ADS1110_Delays(1);
      ADS1110_SCL_SET();
      ADS1110_Delays(1);
      while(ADS1110_SDA_Get())
      {
            ucErrTime++;
            if(ucErrTime>250)
            {
                     ADS1110_Stop();
                     return 1;
            }
      }
      ADS1110_SCL_CLR();//时钟输出0
      return 0;
}

//产生ACK应答
void ADS1110_Ack(void)
{
      ADS1110_SCL_CLR();
      ADS1110_GPIO_Out();
      ADS1110_SDA_CLR();
      ADS1110_Delays(2);
      ADS1110_SCL_SET();
      ADS1110_Delays(2);
      ADS1110_SCL_CLR();
}

//不产生ACK应答
void ADS1110_NAck(void)
{
      ADS1110_SCL_CLR();
      ADS1110_GPIO_Out();
      ADS1110_SDA_SET();
      ADS1110_Delays(2);
      ADS1110_SCL_SET();
      ADS1110_Delays(2);
      ADS1110_SCL_CLR();
}

//IIC发送一个字节
void ADS1110_Send_Byte(u8 txd)
{
      u8 t;
      ADS1110_GPIO_Out();
      ADS1110_SCL_CLR();//拉低时钟开始数据传输
      for(t=0;t<8;t++)
      {
            //IIC_SDA=(txd&0x80)>>7;
            if (txd&0x80)  {ADS1110_SDA_SET();}
            else          {ADS1110_SDA_CLR();}
            txd<<=1;
            ADS1110_Delays(2);
            ADS1110_SCL_SET();
            ADS1110_Delays(2);
            ADS1110_SCL_CLR();
            ADS1110_Delays(2);
      }
}

//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
unsigned char ADS1110_Read_Byte(unsigned char ack)
{
      unsigned char i,receive=0;
      ADS1110_GPIO_In();//SDA设置为输入
      ADS1110_SDA_SET();
      for(i=0;i<8;i++ )
      {
            ADS1110_SCL_CLR();
            ADS1110_Delays(2);
            ADS1110_SCL_SET();
            receive<<=1;
            if(ADS1110_SDA_Get())receive++;
            ADS1110_Delays(1);
      }
      if (!ack)
      ADS1110_NAck();//发送nACK
      else
      ADS1110_Ack(); //发送ACK
      return receive;
}

void ADS_WriteCfgReg(unsigned char CfgData) //Write ADS1110 Congiguration Register
{
      ADS1110_Start();
      ADS1110_Send_Byte(ADS1110WriteAddr);
      ADS1110_Wait_Ack();
      ADS1110_Send_Byte(CfgData);
      ADS1110_Wait_Ack();
      ADS1110_Stop();
}

unsigned int ReadDataCfgReg(unsigned int ReadType)  //Read data from ADS1110 Data register  ReadType=0x01返回AD值,ReadType=0x00返回寄存器值
{
unsigned int temp,temp1;
      ADS1110_Start();
      ADS1110_Send_Byte(ADS1110ReadAddr);
      ADS1110_Wait_Ack();
      temp=ADS1110_Read_Byte(1)<<8;
      ADS1110_Ack();
      temp+=(ADS1110_Read_Byte(1));
      ADS1110_Ack();
      temp1 = ADS1110_Read_Byte(1);
      ADS1110_Ack();
      ADS1110_Stop();
      if(ReadType == 0x01)//返回AD值
      {
            return(temp);
      }
      else       return(temp1);//返回寄存器值
}

void ADS1110_Configuration(void)
{
      ADS1110_GPIO_Configuration();
      ADS_WriteCfgReg(ADS1110Reg);
}

void GetADS1110Data(void)
{
unsigned char Temp[8];
unsigned int Temp24;
      Temp24 = ReadDataCfgReg(1);
      Temp[0] = Temp24/10000%10+0x30;
      Temp[1] = Temp24/1000%10+0x30;
      Temp[2] = Temp24/100%10+0x30;
      Temp[3] = Temp24/10%10+0x30;
      Temp[4] = Temp24%10+0x30;
      Temp[5] = 0x0D;
      Temp[6] = 0x0A;
      Temp[7] = 0;
      USART1_Puts(Temp);
}转载