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我想实现STM32F4驱动AD7705的功能，代码如下，编译

1099b6fd1bebc2f5 2020-07-13 浏览量：757

#include "stm32f4xx.h"
#include "usart.h"
#include "lcd.h"
#include "delay.h"
#include "led.h"
#include "stdio.h"

void RCC_Configuration(void);
void GPIO_Configuration(void);
u16 SPIx_ReadWriteByte(u16 TxData);

void SPIx_Init(void);
u16 ReadTM7705(void);
uint8_t TM7705_Recive8Bit(void);
void TM7705_Send8Bit(uint8_t _data);

void Delay(vu32 nCount)
{
   for(; nCount != 0; nCount--);
}

void GPIO_Configuration(void)
{

      GPIO_InitTypeDef GPIO_InitStructure;
      /@@* Configure USART1 Rx (PB.8) as input floating  busy busy DRDY */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
            GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP ;
                  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA &GPIO_InitStructure);
}

/@@********ÅäÖÃÏμí3ê±Öóê1Äü¸÷íaéèê±Öó***********/
void RCC_Configuration(void)
{
  SystemInit();
  RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOA ENABLE );
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1| RCC_APB2Periph_USART1 ENABLE);
}

/@@********TM77053õê¼»ˉoˉêy***********/
void TM7705_Init(void)
{
      unsigned char i ;
      for(i = 0; i < 100; i++)
{
      SPIx_ReadWriteByte(0xFF);
}
      SPIx_ReadWriteByte(0x20) ;
      Delay(800);
      SPIx_ReadWriteByte(0x02) ;
      Delay(800);
      SPIx_ReadWriteByte(0x10) ;
      Delay(800);
      SPIx_ReadWriteByte(0x44) ;
      Delay(8000);
}

/@@********¶á16Î»êy¾Y************/
u16 ReadTM7705_16BitValue(void)
{
      //unsigned long
                              u16       DataL = 0;
   // unsigned long
                              u16       DataH = 0;
      //unsigned long
                              u16       Ret = 0;

      DataH =SPIx_ReadWriteByte(0xff);
            delay_ms(10);
            DataH = DataH << 8;

            DataL = SPIx_ReadWriteByte(0xff);

            delay_ms(10);
      Ret = DataH | DataL;

      return(Ret) ;
}

/@@********¶áè¡AD7705μúò»í¨μàêy¾Y************/
u16 ReadTM7705(void)
{

            u16       Ret = 0;

               SPIx_ReadWriteByte(0x38) ；
  while(GPIO_ReadInputDataBit(GPIOA GPIO_Pin_10==1))
                              {
                                    ;
                              }
      Ret = ReadTM7705_16BitValue();
      delay_ms(100);

      return Ret;
}

/@@****************************SPI3õê¼»ˉ*************************/
void SPIx_Init(void)
      {
      SPI_InitTypeDef SPI_InitStructure;
      GPIO_InitTypeDef GPIO_InitStructure;
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOA ENABLE);//
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 ENABLE);

            GPIO_PinAFConfig(GPIOBGPIO_PinSource3GPIO_AF_SPI1);
            GPIO_PinAFConfig(GPIOBGPIO_PinSource4GPIO_AF_SPI1);
            GPIO_PinAFConfig(GPIOBGPIO_PinSource5GPIO_AF_SPI1);

      /@@* Configure SPI1 pins: SCK MISO and MOSI */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  //¸′óÃíÆíìêä3ö
   GPIO_InitStructure.GPIO_OType=GPIO_OType_PP ;
//GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP ;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB &GPIO_InitStructure);

      /@@* Configure I/O for Flash Chip select */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;  //SPI CS
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;  //¸′óÃíÆíìêä3ö
      GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP ;
   GPIO_InitStructure.GPIO_OType=GPIO_OType_PP ;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA &GPIO_InitStructure);

      /@@* Deselect the FLASH: Chip Select high */
      GPIO_SetBits(GPIOAGPIO_Pin_9);
   // GPIO_SetBits(GPIOAGPIO_Pin_10);

                  SPI_Cmd(SPI1 DISABLE);

                  /@@* SPI1 configuration */
      SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
      SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
      SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
      SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
      SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
      SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
      SPI_InitStructure.SPI_CRCPolynomial = 7;
      SPI_Init(SPI1 &SPI_InitStructure);

      //SPI1->CR1|=1<<6;
      /@@* Enable SPI1  */
      SPI_Cmd(SPI1 ENABLE);

      SPIx_ReadWriteByte(0xff);
}

u16 SPIx_ReadWriteByte(u16 TxData)
{
      GPIO_ResetBits(GPIOAGPIO_Pin_9);
      while (SPI_I2S_GetFlagStatus(SPI1 SPI_I2S_FLAG_TXE) == RESET); //

      /@@* Send byte through the SPI1 peripheral */
      SPI_I2S_SendData(SPI1 TxData)
      while (SPI_I2S_GetFlagStatus(SPI1 SPI_I2S_FLAG_RXNE) == RESET); //

      /@@* Return the byte read from the SPI bus */
      GPIO_SetBits(GPIOAGPIO_Pin_9);

      return SPI_I2S_ReceiveData(SPI2); //·μ»Øí¨1ySPIx×î½ü½óêÕμÄêy¾Y
}

/@@********Ö÷oˉêy************/
int main(void)
{
u16 adcx;
float temp;

      RCC_Configuration();
      GPIO_Configuration();
            uart_init(76800);
      delay_init(168);
      LCD_Init();
            LED_Init();
            SPIx_Init();
      TM7705_Init();

            POINT_COLOR=BLUE;
            LCD_ShowString(301102001616"ADC_CH1_VAL:");
            LCD_ShowString(301702001616"ADC_CH1_VOLL:0.0000V");

while(1)
   {
   //delay_ms(50);

   adcx = ReadTM7705();

               LCD_ShowxNum(134110adcx5160);
               temp=(float)adcx*(3.0/65535);
         adcx=temp;
               LCD_ShowxNum(134170adcx1160);
               temp-=adcx;
               temp*=10000;
               LCD_ShowxNum(150170temp4160X80);
               LED0=!LED0;
               delay_ms(200);

      }

}

LCD显示出来的一直是最大值65535。。。。应该是数据异常。。。。。。debug的时候SPI里面数据寄存器的数值好像不太正常。。。。求大神帮帮忙。。谢谢啦！