STM32F373 SPI无输出

woshi2

各位，今天做SPI实验，怎么弄都没有输出，请问是怎么回事？
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef  SPI_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC|RCC_AHBPeriph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;    //MOSI ??????????
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;    //SCK  ??????????
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;    //SCK  ??????????
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Connect PXx to SPI_SCK */
GPIO_PinAFConfig(GPIOC, GPIO_Pin_7, GPIO_AF_5);
/* Connect PXx to SPI_MISO */
GPIO_PinAFConfig(GPIOC, GPIO_Pin_8, GPIO_AF_5);
/* Connect PXx to SPI_MOSI */
GPIO_PinAFConfig(GPIOC, GPIO_Pin_9, GPIO_AF_5);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;       //NSS  ???????¨?????ì????
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_SetBits(GPIOC, GPIO_Pin_6);

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//??spi ??
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;//?÷
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;//??????
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;//CPOL=1?±???ü????
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;//CPHA=2 ??????????2??
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//??nss ??????
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;//??spi ?????

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;//???????°
SPI_InitStructure.SPI_CRCPolynomial = 7;//????CRC ????
SPI_Init(SPI1, &SPI_InitStructure);//?????
SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF);//??????
SPI_Cmd(SPI1, ENABLE); /*!< SD_SPI enable */

woshi2 · 发表于 2013-6-17 03:51:04

使用示波器和逻辑分析仪，MOSI/MISO/SCK都为高电平

xiaopaohu123 · 发表于 2013-6-17 11:00:21

先按例程搞一搞，目前只看到你的初始化，你不去读写对应的数据寄存器是看不到有数据和脉冲的

woshi2 · 发表于 2013-6-17 15:31:25

xiaopaohu123 发表于 2013-6-17 11:00
先按例程搞一搞，目前只看到你的初始化，你不去读写对应的数据寄存器是看不到有数据和脉冲的 ...

一直调用这个函数发送0x0a
uint8_t SPI1Byte(uint8_t byte)
{
/*????·????????÷??*/
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==RESET);
/*·???????×???*/
SPI_SendData8(SPI1, byte);
/* ?????????????÷???§*/
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE)==RESET);
return SPI_ReceiveData8(SPI1);
}