stm32f407的PA5不能设置

只看该作者 · 2016-4-21 13:47

发现pa5 pa6 pa7 不能设置.  看 GPIOA->AFR没有发生变化, 而串口却可以. 哪位大神知道
      GPIO_PinAFConfig(GPIOA,GPIO_Pin_5,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,GPIO_Pin_6,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,GPIO_Pin_7,GPIO_AF_SPI1);
   GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);

只看该作者 · 2016-4-21 14:00

且在进行spi设置时, 查看相应的寄存器值都为是,就是根本没有设置进去
RCC_APB2PeriphClockLPModeCmd(RCC_APB2Periph_SPI1, ENABLE);
SPI_I2S_DeInit(SPI1);
/* SPI1 configuration */
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_8;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);

stm32f407的PA5不能设置

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