我在项目开发中用到STM32F207的SPI接口，工作在slave mode下，但在调试过程中遇到对SPI接口初始化时不能使能SPE的现象。
不知道有人遇到过同样的问题吗？
我的初始化代码如下：
#define SPIx SPI1
#define SPIx_CLK RCC_APB2Periph_SPI1
#define SPIx_IRQn SPI1_IRQn
#define SPIx_IRQHANDLER SPI1_IRQHandler
#define SPIx_NSS_PIN GPIO_Pin_4
#define SPIx_NSS_GPIO_PORT GPIOA
#define SPIx_NSS_GPIO_CLK RCC_AHB1Periph_GPIOA
#define SPIx_NSS_SOURCE GPIO_PinSource4
#define SPIx_NSS_AF GPIO_AF_SPI1
#define SPIx_SCK_PIN GPIO_Pin_5
#define SPIx_SCK_GPIO_PORT GPIOA
#define SPIx_SCK_GPIO_CLK RCC_AHB1Periph_GPIOA
#define SPIx_SCK_SOURCE GPIO_PinSource5
#define SPIx_SCK_AF GPIO_AF_SPI1
#define SPIx_MISO_PIN GPIO_Pin_6
#define SPIx_MISO_GPIO_PORT GPIOA
#define SPIx_MISO_GPIO_CLK RCC_AHB1Periph_GPIOA
#define SPIx_MISO_SOURCE GPIO_PinSource6
#define SPIx_MISO_AF GPIO_AF_SPI1
#define SPIx_MOSI_PIN GPIO_Pin_7
#define SPIx_MOSI_GPIO_PORT GPIOA
#define SPIx_MOSI_GPIO_CLK RCC_AHB1Periph_GPIOA
#define SPIx_MOSI_SOURCE GPIO_PinSource7
#define SPIx_MOSI_AF GPIO_AF_SPI1
void SPI_Config(uint16_t spi_cpol, uint16_t spi_cpha, uint16_t spi_lsbef)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
/* Enable the SPI clock */
RCC_APB2PeriphClockCmd(SPIx_CLK, ENABLE);
/* Enable GPIO clocks */
RCC_AHB1PeriphClockCmd(SPIx_SCK_GPIO_CLK | SPIx_MISO_GPIO_CLK | SPIx_MOSI_GPIO_CLK, ENABLE);
/* Connect SPI pins to AF */
GPIO_PinAFConfig(SPIx_SCK_GPIO_PORT, SPIx_SCK_SOURCE, SPIx_SCK_AF);
// GPIO_PinAFConfig(SPIx_NSS_GPIO_PORT, SPIx_NSS_SOURCE, SPIx_NSS_AF);
GPIO_PinAFConfig(SPIx_MOSI_GPIO_PORT, SPIx_MOSI_SOURCE, SPIx_MOSI_AF);
GPIO_PinAFConfig(SPIx_MISO_GPIO_PORT, SPIx_MISO_SOURCE, SPIx_MISO_AF);
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_DOWN;
/* SPI SCK pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN;
GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStructure);
/* SPI MOSI pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_MOSI_PIN;
GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStructure);
/* SPI MISO pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_MISO_PIN;
GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStructure);
/* SPI NSS pin configuration */
/*
GPIO_InitStructure.GPIO_Pin = SPIx_NSS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStructure);
*/
/* SPI configuration -------------------------------------------------------*/
SPI_I2S_DeInit(SPIx);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_CPOL = spi_cpol;
SPI_InitStructure.SPI_CPHA = spi_cpha;
SPI_InitStructure.SPI_FirstBit = spi_lsbef;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPIx, &SPI_InitStructure);
/* Configure the Priority Group to 0 bit */
// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
/* Configure the SPI interrupt priority */
NVIC_InitStructure.NVIC_IRQChannel = SPIx_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
SPI_I2S_ITConfig(SPIx, SPI_I2S_IT_RXNE, ENABLE);
/* Enable the SPI peripheral */
SPI_Cmd(SPIx, ENABLE); //此处对SPI1的寄存器CR1的SPE位置1，但通过读取寄存器发现SPE仍旧为0
} |
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