我想实现STM32F4驱动AD7705的功能，代码如下，编译没有错误，求大佬帮忙看看

ID:797057 · 发表于 2020-7-13 12:42

本帖最后由有没有鱼干于 2020-7-13 16:50 编辑

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！
单片机源程序如下:

#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±Öó,ê1Äü¸÷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); //3ÖDøDIN¸ßμçÆ½D′2ù×÷￡¬»Ö¸′AD7705½ó¿ú
}
SPIx_ReadWriteByte(0x20) ; //í¨μà1 ,ÏÂò»¸öD′ê±Öó¼Ä′æÆ÷
Delay(800);
SPIx_ReadWriteByte(0x02) ; //D′ê±Öó¼Ä′æÆ÷éèÖÃ¸üDÂËùÂêÎa200Hz
Delay(800);
SPIx_ReadWriteByte(0x10) ; //í¨μà1 ,ÏÂò»¸öD′éèÖÃ¼Ä′æÆ÷
Delay(800);
SPIx_ReadWriteByte(0x44) ; //D′éèÖÃ¼Ä′æÆ÷ ,éèÖÃ3éË«¼«DÔ¡￠ÎT»o3å¡￠ÔöòæÎa0¡￠ÂË2¨Æ÷1¤×÷¡￠×ÔD￡×¼
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)
{
// unsigned long
u16 Ret = 0;
// GPIO_Configuration();
// SPIx_Init();
// TM7705_Init();
SPIx_ReadWriteByte(0x38) ;//éèÖÃ¶áμ±Ç°í¨μàêy¾Y
while(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_10==1))
{
;
}
Ret = ReadTM7705_16BitValue();
delay_ms(100);
return Ret;
}
/****************************SPI3õê¼»ˉ*************************/
//SPI¿ú3õê¼»ˉ
//ÕaàïÕëêÇ¶ÔSPI1μÄ3õê¼»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(GPIOB,GPIO_PinSource3,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_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(GPIOA,GPIO_Pin_9);
// GPIO_SetBits(GPIOA,GPIO_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(GPIOA,GPIO_Pin_9);
// GPIO_ResetBits(GPIOA,GPIO_Pin_10);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET); //
/* Send byte through the SPI1 peripheral */
SPI_I2S_SendData(SPI1, TxData); //í¨1yíaéèSPIx·￠Ëíò»¸öêy¾Y
//TM7705_Send8Bit(TxData);
/* Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); //
/* Return the byte read from the SPI bus */
//TM7705_Recive8Bit() ;
GPIO_SetBits(GPIOA,GPIO_Pin_9);
// GPIO_SetBits(GPIOA,GPIO_Pin_10);
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(30,110,200,16,16,"ADC_CH1_VAL:");
LCD_ShowString(30,170,200,16,16,"ADC_CH1_VOLL:0.0000V");
while(1)
{
//delay_ms(50);
adcx = ReadTM7705();
LCD_ShowxNum(134,110,adcx,5,16,0);
temp=(float)adcx*(3.0/65535);
adcx=temp;
LCD_ShowxNum(134,170,adcx,1,16,0);
temp-=adcx;
temp*=10000;
LCD_ShowxNum(150,170,temp,4,16,0X80);
LED0=!LED0;
delay_ms(200);
}
}

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