基于STM32的ADS1118+uart串口顯示程序

ID:465802 · 發(fā)表于 2019-5-13 17:06

STM32使用SPI1驅(qū)動(dòng)ADS1118

#include "ads1118.h"
#include "sys.h"
#include "delay.h"
#include "usart.h"

void SPI1_Init(void)
{

      GPIO_InitTypeDef GPIO_InitStructure;
      SPI_InitTypeDef SPI_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE );//open the PORTB clock
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE );//open the SPI1 clock
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;//enable PB14/15/13
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //setting PB3/4/5 to push-pull mode
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  //set GPIO speed
      GPIO_Init(GPIOA, &GPIO_InitStructure);//Initical GPIOA

      GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);  //PA5/6/7上拉

      SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //設(shè)置SPI單向或者雙向的數(shù)據(jù)模式:SPI設(shè)置為雙線雙向全雙工
      SPI_InitStructure.SPI_Mode = SPI_Mode_Master;             //設(shè)置SPI工作模式:設(shè)置為主SPI
      SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;             //設(shè)置SPI的數(shù)據(jù)大小:SPI發(fā)送接收8位幀結(jié)構(gòu)
      SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;             //串行同步時(shí)鐘的空閑狀態(tài)為低電平
      SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;       //串行同步時(shí)鐘的第二個(gè)跳變沿（上升或下降）數(shù)據(jù)被采樣
      SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;             //NSS信號(hào)由硬件（NSS管腳）還是軟件（使用SSI位）管理:內(nèi)部NSS信號(hào)有SSI位控制
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;             //定義波特率預(yù)分頻的值:波特率預(yù)分頻值為256
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;       //指定數(shù)據(jù)傳輸從MSB位還是LSB位開(kāi)始:數(shù)據(jù)傳輸從MSB位開(kāi)始
      SPI_InitStructure.SPI_CRCPolynomial = 7;       //CRC值計(jì)算的多項(xiàng)式
      SPI_Init(SPI1, &SPI_InitStructure);  //根據(jù)SPI_InitStruct中指定的參數(shù)初始化外設(shè)SPIx寄存器

      SPI_Cmd(SPI1, ENABLE); //使能SPI外設(shè)


      ADS1118_ReadVotage(0x62eB);//啟動(dòng)傳輸
      delay_ms(8);
}

void ADS1118_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
      RCC_APB2PeriphClockCmd(       RCC_APB2Periph_GPIOA, ENABLE );       //PORTF時(shí)鐘使能

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;                                                       //PF0 推挽
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;                         //推挽輸出
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

  ADC_CS_High();                                                                                                                                                                      //CS拉高，器件不工作
      SPI1_Init();                                                                                                                                                                         //初始化SPI1
      SPI1_SetSpeed(SPI_BaudRatePrescaler_8);                                                                      //設(shè)置為--M時(shí)鐘,高速模式 9MHZ時(shí)鐘

}

//SPI 速度設(shè)置函數(shù)
//SpeedSet:
//SPI_BaudRatePrescaler_2 2分頻
//SPI_BaudRatePrescaler_8 8分頻
//SPI_BaudRatePrescaler_16  16分頻
//SPI_BaudRatePrescaler_256 256分頻

void SPI1_SetSpeed(u8 SPI_BaudRatePrescaler)
{
  assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
      SPI1->CR1&=0XFFC7;
      SPI1->CR1|=SPI_BaudRatePrescaler;       //設(shè)置SPI1速度
      SPI_Cmd(SPI1,ENABLE);

}

u8 ADS1118_ReadWrite(u8 ConfigReg1)
{
            u8 retry=0;
            while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) //檢查指定的SPI標(biāo)志位設(shè)置與否:發(fā)送緩存空標(biāo)志位
            {
            retry++;
            if(retry>200)return 0;
            }

      SPI_I2S_SendData(SPI1, ConfigReg1);

      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET) //檢查指定的SPI標(biāo)志位設(shè)置與否:接受緩存非空標(biāo)志位
            {
            retry++;
            if(retry>200)return 0;
            }

            return SPI_I2S_ReceiveData(SPI1);
}

u16 ADS1118_ReadVotage(u16 ConfigReg)                                                                         //ADS1118配置，設(shè)置16位數(shù)據(jù)輸入，
{
      u8  Hbyte=0;                                                                                                                                                                               //高8位
      u8  Lbyte=0;                                                                                                                                                                               //低8位
      u16 tmp=0;                                                                                                                                                                               //數(shù)據(jù)

      ADC_CS_Low();                                                                                           //CS拉低
      delay_us(2);                                                                                                                                                                      //CS下降沿SCK第一個(gè)上升沿需要大于100ns

      Hbyte=       ADS1118_ReadWrite((u8)(ConfigReg>>8));
      Lbyte=  ADS1118_ReadWrite((u8)ConfigReg);
      tmp=((u16)Hbyte<<8)|(u16)Lbyte;

      delay_us(2);                                                                                                                                                       //CS????????SCK????????100ns
      ADC_CS_High();                                                                                  //CS??,??????

      return tmp;                                                                                                                                                                         //??????
}

全部資料51hei下載地址：

ADS1118_2.7z (205.76 KB, 下載次數(shù): 245)