#include "ads1256.h"
#include "spi.h"
#include "modbus.h"

unsigned int sum;
long ulResult;
long double ldVolutage;

int ads_num = 0;

int ads_cnt = 0;

//-----------------------------------------------------------------//
//	功    能：ADS1256 写数据
//	入口参数: /
//	出口参数: /
//	全局变量: /
//	备    注: 向ADS1256中地址为regaddr的寄存器写入一个字节databyte
//-----------------------------------------------------------------//
void ADS1256WREG(unsigned char regaddr,unsigned char databyte)
{
	unsigned char cmd;
    //CS_0;
	while(ADS1256_DRDY)
	{
		ads_cnt++;
		if(ads_cnt >= 65535)
		{
			ads_cnt = 0;
			return;
		}
			
	}//当AD2_DRDY为低时才能写寄存器
	//向寄存器写入数据地址
	cmd = ADS1256_CMD_WREG|(regaddr & 0x0F);
	HAL_SPI_Transmit(&hspi1, &cmd, 1, 10);
    //写入数据的个数n-1
	cmd = 0x00;
	HAL_SPI_Transmit(&hspi1, &cmd, 1, 10);
    //向regaddr地址指向的寄存器写入数据databyte
    HAL_SPI_Transmit(&hspi1, &databyte, 1, 10);
	//CS_1;
}


//初始化ADS1256
void ads1256_init(void)
{
	//CS_0;
	HAL_GPIO_WritePin(ADS1256_PDWN_GPIO_Port,ADS1256_PDWN_Pin,GPIO_PIN_SET);
	ADS1256WREG(ADS1256_STATUS,0x06);// 高位在前、校准、使用缓冲
	ADS1256WREG(ADS1256_MUX,ADS1256_MUXP_AIN0 | ADS1256_MUXN_AINCOM);// 初始化端口A0为‘+’，AINCOM位‘-’
	ADS1256WREG(ADS1256_ADCON,0x00);// 放大倍数1
	ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_30000SPS);// 数据30000sps
	ADS1256WREG(ADS1256_IO,0x00);
}

//读取AD值
long double ADS1256ReadData(uint8_t channel)  
{
  unsigned char cmd;
	unsigned char data[3];
  while(ADS1256_DRDY)
	{
		ads_cnt++;
		if(ads_cnt >= 65535)
		{
			ads_cnt = 0;
			return ldVolutage;
		}
			
	}//当AD2_DRDY为低时才能写寄存器;
  
  //切换通道
  //注意：本次写入的新通道在下次读取时才会生效，本次读到的是上一次的值
  switch(channel)
  {
    case 0:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN0 | ADS1256_MUXN_AINCOM);
      break;
    case 1:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN1 | ADS1256_MUXN_AINCOM);
      break; 
    case 2:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN2 | ADS1256_MUXN_AINCOM);
      break; 
    case 3:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN3 | ADS1256_MUXN_AINCOM);
      break; 
    case 4:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN4 | ADS1256_MUXN_AINCOM);
      break; 
    case 5:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN5 | ADS1256_MUXN_AINCOM);
      break; 
    case 6:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN6 | ADS1256_MUXN_AINCOM);
      break; 
    case 7:
      ADS1256WREG(ADS1256_MUX, ADS1256_MUXP_AIN7 | ADS1256_MUXN_AINCOM);
      break; 
  }

  //CS_0;
  cmd = ADS1256_CMD_SYNC;
  HAL_SPI_Transmit(&hspi1, &cmd, 1, 10);
  cmd = ADS1256_CMD_WAKEUP;
  HAL_SPI_Transmit(&hspi1, &cmd, 1, 10);

  //发送单次读命令
  cmd = ADS1256_CMD_RDATA;
  HAL_SPI_Transmit(&hspi1, &cmd, 1, 10);

  //读24位数据
  HAL_SPI_Receive(&hspi1, (uint8_t *)data, 3, 10);
  sum = (unsigned int)(data[0]<<16)|(data[1]<<8)|data[2];

  //单位转换为mV (VREF=2.5V) 
  ulResult = sum;
  if(ulResult & 0x800000)
  {
    ulResult =  ~(unsigned long)ulResult;
    ulResult &= 0x7fffff;
    ulResult += 1;
    ulResult =  -ulResult;
    ldVolutage = (long double)ulResult*0.000596046518808;
  }
  else 
    ldVolutage = (long double)ulResult*0.000596046518808;

  return ldVolutage;
}

void ads1256_get_data(void)
{
	switch(ads_num)
	{
		case 0 :
		{
			InputReg[0]  = (uint16_t)((ADS1256ReadData(1) * 10));//ADS1256数据备用（0-25000uA）
			ads_num = 1;
		}
		break;
		
		case 1 :
		{
			InputReg[1]  = (uint16_t)((ADS1256ReadData(2) * 10));//ADS1256数据备用（0-25000uA）
			ads_num = 2;
		}
		break;
			
		case 2 :
		{
			InputReg[2] = (uint16_t)((ADS1256ReadData(3) * 10));//ADS1256数据备用（0-25000uA）
			ads_num = 3;
		}
		break;
		
		case 3 :
		{			
			InputReg[3] = (uint16_t)((ADS1256ReadData(4) * 10));//ADS1256数据备用（0-25000uA）
			ads_num = 4;
		}
		break;
		
		case 4 :
		{
			InputReg[4] = (uint16_t)((ADS1256ReadData(5) * 10));// ADS1256数据备用（0-25000uA）
			ads_num = 5;
		}
		break;
		
		case 5 :
		{
			InputReg[5] = (uint16_t)((ADS1256ReadData(6) * 10));//ADS1256数据备用（0-25000uA）
			ads_num = 6;
		}
		break;
		
		case 6 :
		{
			InputReg[6] = (uint16_t)((ADS1256ReadData(7) * 10));//ADS1256数据备用（0-25000uA）
			ads_num = 7;
		}
		break;
		
		case 7 :
		{
			InputReg[7] = (uint16_t)((ADS1256ReadData(0) * 10));// - 1507.8) / 0.082);//ADS1256数据备用（0-25000uA）
			ads_num = 0;
		}
		break;
	}
}