STM32F407 主从通信无法实现

zpcflying2022

spi主从通信代码： spi1 发送 spi2 接收，这个代码下载进去，spi1 sck(pa5),mosi(pa7)均没有波形，是怎么回事


#include "spi.h"

u8 SPI_Data[3];

void SPI1_Init(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        SPI_InitTypeDef  SPI_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);//
       
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource5,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource7,GPIO_AF_SPI1);

RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);

//SPI1_ReadWriteByte(0xff);
}
//@Ref SPI_BaudRate_Prescaler:SPI_BaudRatePrescaler_2~SPI_BaudRatePrescaler_256
//fAPB284Mhz:
void SPI1_SetSpeed(u8 SPI_BaudRatePrescaler)
{
        assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
SPI1->CR1&=0XFFC7;
SPI1->CR1|=SPI_BaudRatePrescaler;
SPI_Cmd(SPI1,ENABLE);
}

void SPI1_WriteByte(u8 TxData)
{
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){}

SPI_I2S_SendData(SPI1, TxData); //

//while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){}

//return SPI_I2S_ReceiveData(SPI1);
}

void SPI2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//GPIOB
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); //SPI2

//GPIOA3,4,5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;//PB3~5
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//
GPIO_Init(GPIOB, &GPIO_InitStructure);//

GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_SPI2); //PB13 SPI2
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_SPI2); //PB14 SPI2
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2); //PB15 SPI2

//
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,ENABLE);//SPI1
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,DISABLE);//SPI1

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//:SPI
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave; //
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2; //
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //
SPI_InitStructure.SPI_CRCPolynomial = 7; //
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI2, ENABLE); //
}

void SPI2_SetSpeed(u8 SPI_BaudRatePrescaler)
{
assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
SPI2->CR1&=0XFFC7;
SPI2->CR1|=SPI_BaudRatePrescaler;
SPI_Cmd(SPI2,ENABLE);
}

u8 SPI2_ReadByte(void)
{
//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){} //
return SPI_I2S_ReceiveData(SPI2); //
}
void SPI2_WriteByte(u8 TxData)
{
SPI_I2S_SendData(SPI2, TxData); //
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET){}//
}