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#include <stdio.h>
#include "stm32f10x_gpio.h"
#include "ADS1256.h"
//***************************
// Pin assign
// STM32 ADS1256
// GPIOB_Pin_11 <--- DRDY
// GPIOB_Pin_12 ---> CS
// GPIOB_Pin_13 ---> SCK
// GPIOB_Pin_14(MISO) <--- DOUT
// GPIOB_Pin_15(MOSI) ---> DIN
//***************************
/*端口定義*/
#define RCC_DRDY RCC_APB2Periph_GPIOB
#define PORT_DRDY GPIOB
#define PIN_DRDY GPIO_Pin_11
#define PORT_CS GPIOB
#define PIN_CS GPIO_Pin_12
#define CS_0() GPIO_ResetBits(PORT_CS, PIN_CS);
#define CS_1() GPIO_SetBits(PORT_CS, PIN_CS);
#define ADS1256_DRDY (PORT_DRDY->IDR & PIN_DRDY)
void SPI2_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/****Initial SPI2******************/
/* Enable SPI2 and GPIOB clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
/* Configure SPI2 pins: NSS, SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* SPI2 configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //SPI1設置為兩線全雙工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //設置SPI2為主模式
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //SPI發送接收8位幀結構
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //串行時鐘在不操作時，時鐘為低電平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //第一個時鐘沿開始采樣數據
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信號由軟件（使用SSI位）管理
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //定義波特率預分頻的值:波特率預分頻值為8
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //數據傳輸從MSB位開始
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值計算的多項式
SPI_Init(SPI2, &SPI_InitStructure);
/* Enable SPI2 */
SPI_Cmd(SPI2, ENABLE);
}
//初始化ADS1256 GPIO
void Init_ADS1256_GPIO(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_DRDY, ENABLE);
GPIO_InitStructure.GPIO_Pin = PIN_DRDY;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(PORT_DRDY, &GPIO_InitStructure);
//SPI2 NSS
CS_1();
GPIO_InitStructure.GPIO_Pin = PIN_CS;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(PORT_CS, &GPIO_InitStructure);
SPI2_Init();
}
//-----------------------------------------------------------------//
// 功能：模擬SPI通信
// 入口參數: / 發送的SPI數據
// 出口參數: / 接收的SPI數據
// 全局變量: /
// 備注: 發送接收函數
//-----------------------------------------------------------------//
unsigned char SPI_WriteByte(unsigned char TxData)
{
unsigned char RxData=0;
while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE)==RESET);
SPI_I2S_SendData(SPI2,TxData);
while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_RXNE)==RESET);
RxData=SPI_I2S_ReceiveData(SPI2);
return RxData;
}
//-----------------------------------------------------------------//
// 功能：ADS1256 寫數據
// 入口參數: /
// 出口參數: /
// 全局變量: /
// 備注: 向ADS1256中地址為regaddr的寄存器寫入一個字節databyte
//-----------------------------------------------------------------//
void ADS1256WREG(unsigned char regaddr,unsigned char databyte)
{
CS_0();
while(ADS1256_DRDY);//當ADS1256_DRDY為低時才能寫寄存器
//向寄存器寫入數據地址
SPI_WriteByte(ADS1256_CMD_WREG | (regaddr & 0x0F));
//寫入數據的個數n-1
SPI_WriteByte(0x00);
//向regaddr地址指向的寄存器寫入數據databyte
SPI_WriteByte(databyte);
CS_1();
}
//初始化ADS1256
void ADS1256_Init(void)
{
//*************自校準****************
while(ADS1256_DRDY);
CS_0();
SPI_WriteByte(ADS1256_CMD_SELFCAL);
while(ADS1256_DRDY);
CS_1();
//**********************************
ADS1256WREG(ADS1256_STATUS,0x06); // 高位在前、使用緩沖
// ADS1256WREG(ADS1256_STATUS,0x04); // 高位在前、不使用緩沖
// ADS1256WREG(ADS1256_MUX,0x08); // 初始化端口A0為‘+’，AINCOM位‘-’
ADS1256WREG(ADS1256_ADCON,ADS1256_GAIN_1); // 放大倍數1
ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_10SPS); // 數據10sps
ADS1256WREG(ADS1256_IO,0x00);
//*************自校準****************
while(ADS1256_DRDY);
CS_0();
SPI_WriteByte(ADS1256_CMD_SELFCAL);
while(ADS1256_DRDY);
CS_1();
//**********************************
}
//讀取AD值
signed int ADS1256ReadData(unsigned char channel)
{
unsigned int sum=0;
while(ADS1256_DRDY);//當ADS1256_DRDY為低時才能寫寄存器
ADS1256WREG(ADS1256_MUX,channel); //設置通道
CS_0();
SPI_WriteByte(ADS1256_CMD_SYNC);
SPI_WriteByte(ADS1256_CMD_WAKEUP);
SPI_WriteByte(ADS1256_CMD_RDATA);
sum |= (SPI_WriteByte(0xff) << 16);
sum |= (SPI_WriteByte(0xff) << 8);
sum |= SPI_WriteByte(0xff);
CS_1();
if (sum>0x7FFFFF) // if MSB=1,
{
sum -= 0x1000000; // do 2's complement
}
return sum;
}

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