这个程序没问题，我的，用过项目，不过只是简单的读取，给你参考一下吧
H头文件
#include "stm32f10x.h"
#include <stdio.h>
extern void Delay(vu32 nCount);
extern void RCC_Configuration(void);
extern void TM7705_Init(void);
extern u16 ReadTM7705_16BitValue(void);
extern u16 ReadTM7705(void);
extern void SPIx_Init(void);
extern u8 SPIx_ReadWriteByte(u8 TxData);
=============================================================================
C文件
#include "AD7705.h"
void Delay(vu32 nCount)
{
for(; nCount != 0; nCount--);
}
/********配置系统时钟,使能各外设时钟***********/
void RCC_Configuration(void)
{
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOA
|RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO
|RCC_APB2Periph_SPI1, ENABLE );
}
/********TM7705初始化函数***********/
void TM7705_Init(void)
{
unsigned char i ;
for(i = 0; i < 100; i++)
{
SPIx_ReadWriteByte(0xFF); //持续DIN高电平写操作，恢复AD7705接口
}
SPIx_ReadWriteByte(0x20) ; //通道1 ,下一个写时钟寄存器
Delay(1000);
SPIx_ReadWriteByte(0x0c) ; //写时钟寄存器设置更新速率为200Hz
Delay(1000);
SPIx_ReadWriteByte(0x10) ; //通道1 ,下一个写设置寄存器
Delay(1000);
SPIx_ReadWriteByte(0x44) ; //写设置寄存器 ,设置成双极性、无缓冲、增益为0、滤波器工作、自校准
Delay(1000000);
Delay(1000000);
}
/********读16位数据************/
u16 ReadTM7705_16BitValue(void)
{
unsigned long DataL = 0;
unsigned long DataH = 0;
unsigned long Ret = 0;
DataH = SPIx_ReadWriteByte(0xFF);
DataH = DataH << 8;
DataL = SPIx_ReadWriteByte(0xFF);
Ret = DataH | DataL;
return(Ret) ;
}
/********读取AD7705第一通道数据************/
u16 ReadTM7705(void)
{
unsigned long Ret = 0;
SPIx_ReadWriteByte(0x38) ; //设置读当前通道数据
while(GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_12 == 1))
{
;
}
Ret = ReadTM7705_16BitValue();
return Ret;
}
void SPIx_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure SPI1 pins: SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure I/O for Flash Chip select */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //SPI CS
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;//RST
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Deselect the FLASH: Chip Select high */
GPIO_SetBits(GPIOB,GPIO_Pin_0);
GPIO_ResetBits(GPIOB,GPIO_Pin_1);
Delay(1000000);
Delay(1000000);
GPIO_SetBits(GPIOB,GPIO_Pin_1);
/* SPI1 configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //设置SPI的数据大小:SPI发送接收8位帧结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //选择了串行时钟的稳态:时钟悬空高
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //数据捕获于第二个时钟沿
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64; //定义波特率预分频的值:波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式
SPI_Init(SPI1, &SPI_InitStructure); //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器
//SPI1->CR1|=1<<6; //SPI设备使能
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE); //使能SPI外设
SPIx_ReadWriteByte(0xff);//启动传输
}
//SPIx 读写一个字节
//TxData:要写入的字节
//返回值:读取到的字节
u8 SPIx_ReadWriteByte(u8 TxData)
{
GPIO_ResetBits(GPIOB,GPIO_Pin_0);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET); //检查指定的SPI标志位设置与否:发送缓存空标志位
/* Send byte through the SPI1 peripheral */
SPI_I2S_SendData(SPI1, TxData); //通过外设SPIx发送一个数据
/* Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); //检查指定的SPI标志位设置与否:接受缓存非空标志
/* Return the byte read from the SPI bus */
GPIO_SetBits(GPIOB,GPIO_Pin_0);
return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据
}
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