stm32f207vc spi1时钟无法输出

tianjianlv-1178 提问时间：2013-12-21 15:36 /

控制stm32F207vc开发板中的spi1（master），无法输出clock，请教大侠们！
#ifdef OpenSPI1
#define Open207V_SPIx SPI1

#define Open207V_SPIx_CLK RCC_APB2Periph_SPI1
#define Open207V_SPIx_IRQn SPI1_IRQn
#define Open207V_SPIx_IRQHANDLER SPI1_IRQHandler

#define Open207V_SPIx_SCK_PIN GPIO_Pin_5
#define Open207V_SPIx_SCK_GPIO_PORT GPIOA
#define Open207V_SPIx_SCK_GPIO_CLK RCC_AHB1Periph_GPIOA
#define Open207V_SPIx_SCK_SOURCE GPIO_PinSource5
#define Open207V_SPIx_SCK_AF GPIO_AF_SPI1

#define Open207V_SPIx_MISO_PIN GPIO_Pin_6
#define Open207V_SPIx_MISO_GPIO_PORT GPIOA
#define Open207V_SPIx_MISO_GPIO_CLK RCC_AHB1Periph_GPIOA
#define Open207V_SPIx_MISO_SOURCE GPIO_PinSource6
#define Open207V_SPIx_MISO_AF GPIO_AF_SPI1

#define Open207V_SPIx_MOSI_PIN GPIO_Pin_5
#define Open207V_SPIx_MOSI_GPIO_PORT GPIOB
#define Open207V_SPIx_MOSI_GPIO_CLK RCC_AHB1Periph_GPIOB
#define Open207V_SPIx_MOSI_SOURCE GPIO_PinSource5
#define Open207V_SPIx_MOSI_AF GPIO_AF_SPI1
#endif

初始化函数如下：
{
SPI_InitTypeDef SPI_InitStruct;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(Open207V_SPIx_SCK_GPIO_CLK | Open207V_SPIx_MISO_GPIO_CLK | Open207V_SPIx_MOSI_GPIO_CLK,ENABLE);
#ifdef OpenSPI1
RCC_APB2PeriphClockCmd(Open207V_SPIx_CLK,ENABLE);
#else
RCC_APB1PeriphClockCmd(Open207V_SPIx_CLK,ENABLE);
#endif

GPIO_PinAFConfig(Open207V_SPIx_SCK_GPIO_PORT, Open207V_SPIx_SCK_SOURCE, Open207V_SPIx_SCK_AF);
GPIO_PinAFConfig(Open207V_SPIx_MISO_GPIO_PORT, Open207V_SPIx_MISO_SOURCE, Open207V_SPIx_MISO_AF);
GPIO_PinAFConfig(Open207V_SPIx_MOSI_GPIO_PORT, Open207V_SPIx_MOSI_SOURCE, Open207V_SPIx_MOSI_AF);

GPIO_InitStructure.GPIO_Pin = Open207V_SPIx_SCK_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(Open207V_SPIx_SCK_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = Open207V_SPIx_MISO_PIN;
GPIO_Init(Open207V_SPIx_MISO_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = Open207V_SPIx_MOSI_PIN;
GPIO_Init(Open207V_SPIx_MOSI_GPIO_PORT, &GPIO_InitStructure);

SPI_I2S_DeInit(Open207V_SPIx);
SPI_InitStruct.SPI_Direction= SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low ;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft ;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_CRCPolynomial = 7;
SPI_Init(Open207V_SPIx, &SPI_InitStruct);

SPI_Cmd(Open207V_SPIx, ENABLE);

}
如果我将SPI1_SCK引脚换成PB3的功能引脚，则有clock输出，很奇怪为什么PA5这个引脚无法输出clock，已经确定该引脚没有复用，看了下手册该引脚IO结构是TTa的，不知道是啥意思？