Question
Stm32f429 SPI3 no clock on CLK pin
Posted on February 04, 2016 at 14:02
I have just made my own SPI3 initilization code as its shown below.
void Spi_Init(void){ SPI_InitTypeDef SPI_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; SPI_StructInit(&SPI_InitStructure); /*!< Enable the SPI clock */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); /*!< Enable GPIO clocks */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); /*!< Connect SPI pins to AF5 */ GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_SPI3); GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_SPI3); GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_SPI3); /*!< SPI pins configuration *************************************************/ GPIO_InitStructure.GPIO_Pin = GPIO_PinSource10|GPIO_PinSource11|GPIO_PinSource12; 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_NOPULL; GPIO_Init(GPIOC, &GPIO_InitStructure); 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_32; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; /*!< Disable SPI */ SPI_Cmd(SPI3, DISABLE); SPI_Init(SPI3, &SPI_InitStructure); /*!< Enable SPI */ SPI_Cmd(SPI3, ENABLE);}at main c i have this code runningwhile(1) { SPI3->DR = 0x15;}But I can not see clk signal on my ossiloscope is my init code is wrong or smtn else