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Initialize SPI1 problem

glukolin1
Associate
Posted on March 15, 2012 at 14:20

Hi,

I am using STM32F100CBT6B for my development. my hardware engineer had created a custom board, so I am not using the eval board.

My software will communite wil a LCD controller using SPI port. Previously I am using SPI2 and everything works fine. Now, we need to change from SPI2 to SPI1. I had already made all necessary changes, but I am still getting no output from MOSI and SCK pins.

Here I am attaching my code for SPI1 initialization, do I missed out anything?

SPI_InitTypeDef   SPI_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);

// Deinitializes the SPI1

SPI_DeInit(SPI1);

// Release reset of SPI1

RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);

// Configure SPI1_CLK and SPI1_MOSI pins

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinRemapConfig(GPIO_Remap_SPI1,DISABLE);

// SPI init

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_High;

SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_Init(SPI1, &SPI_InitStructure);

    

// Enable SPI1

SPI_Cmd(SPI1, ENABLE);

while(1)

{

SPI_SendData(SPI1, 0xAB);

delayms(200);

SPI_SendData(SPI1, 0xCD);

delayms(200);

}

#spi1 #spi #stm32
1 REPLY 1
mozra
Associate
Posted on March 16, 2012 at 16:26

Hi,

if you will use the remap feature please enable the AFIO interface before the GPIO configuration using this function:

/* Enable AFIO clock */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

by default you dont need to disable the SPI remap feature

Regards

mozra