关于SPI通信的问题，SPI配置为主机发送，但是PA5引脚上一直没有SCLK波形

a273076066 · 发表于 2015-7-14 19:52:55

[mw_shl_code=c,true]int main(void) { RCC_Configuration(); GPIO_Configuration(); SPI1_configuration(); NVIC_Configuration(); //WWDG_Configuration(); while(1) { while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET); SPI_I2S_SendData(SPI1, 0x12);//SPI1 GPIO_WriteBit(GPIOB, GPIO_Pin_9, (BitAction)(1- GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_9))); Delayms(5); } } void SPI1_configuration(void) { SPI_InitTypeDef SPI_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 ,ENABLE); SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx; 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_2Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB; SPI_Init(SPI1, &SPI_InitStructure); SPI_Cmd(SPI1, ENABLE); } [/mw_shl_code]

配置为单线发送模式，发完一次PB9电平取反，现在的现象是灯闪正常，但是PA5没有时钟波形，请问下大家这个是啥原因了