SPI1 on STM32F4Discovery

dennis23 · ‎2013-06-02

Posted on June 02, 2013 at 15:52

Hi community,

for a few days i try to use the SPI1 on the F4Discovery board. I use the PA5-PA7 pins on AF5. But after my init the code does nothing? What is wrong in my init function?

#define Open_SPI_MISO_PIN GPIO_Pin_6

#define Open_SPI_MOSI_PIN GPIO_Pin_7

#define Open_SPI_SCK_PIN GPIO_Pin_5

#define Open_SPI_GPIO_PORT GPIOA

#define Open_SPI_GPIO_CLK RCC_AHB1Periph_GPIOA

#define Open_SPI_CLK RCC_APB2Periph_SPI1

#define Open_SPI_MISO_SOURCE GPIO_PinSource6

#define Open_SPI_MOSI_SOURCE GPIO_PinSource7

#define Open_SPI_SCK_SOURCE GPIO_PinSource5

#define Open_SPI_MISO_AF GPIO_AF_SPI1

#define Open_SPI_MOSI_AF GPIO_AF_SPI1

#define Open_SPI_SCK_AF GPIO_AF_SPI1

#define Open_SPI_MISO_GPIO_PORT GPIOA

#define Open_SPI_MOSI_GPIO_PORT GPIOA

#define Open_SPI_SCK_GPIO_PORT GPIOA

#define Open_SPI SPI1

void SPI_BusInit(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

SPI_InitTypeDef SPI_InitStructure;

//NVIC_InitTypeDef NVIC_InitStructure;

//=========================================================================================

// Enable GPIO clock

//-----------------------------------------------------------------------------------------

RCC_AHB1PeriphClockCmd(Open_SPI_GPIO_CLK, ENABLE);

//=========================================================================================

// Enable SPI clock

//-----------------------------------------------------------------------------------------

RCC_APB2PeriphClockCmd(Open_SPI_CLK, ENABLE);

//=========================================================================================

// Configure SPI GPIO

//-----------------------------------------------------------------------------------------

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Pin = Open_SPI_MISO_PIN | Open_SPI_MOSI_PIN | Open_SPI_SCK_PIN;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(Open_SPI_GPIO_PORT, &GPIO_InitStructure);

//=========================================================================================

//GPIO Alternate functions configuration

//-----------------------------------------------------------------------------------------

GPIO_PinAFConfig(Open_SPI_MISO_GPIO_PORT, Open_SPI_MISO_SOURCE, Open_SPI_MISO_AF);

GPIO_PinAFConfig(Open_SPI_MOSI_GPIO_PORT, Open_SPI_MOSI_SOURCE, Open_SPI_MOSI_AF);

GPIO_PinAFConfig(Open_SPI_SCK_GPIO_PORT, Open_SPI_SCK_SOURCE, Open_SPI_SCK_AF);

//=========================================================================================

// Configure SPI AF

//-----------------------------------------------------------------------------------------

//SPI_I2S_DeInit(SPI1);

SPI_StructInit(&SPI_InitStructure);

SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; // 328kHz

//SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

//SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

//SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft | SPI_NSSInternalSoft_Set;

SPI_Init(Open_SPI, &SPI_InitStructure);

//SPI_CalculateCRC(Open_SPI, DISABLE);

SPI_Cmd(Open_SPI, ENABLE);

waclawek.jan · ‎2013-06-02

Posted on June 02, 2013 at 22:30

> But after my init the code does nothing?

What code? And what is ''does nothing''?

JW

dennis23 · ‎2013-06-03

Posted on June 03, 2013 at 10:33

After I init the SPI and write with SPI1->DR = test; the SPI interface doesnt transmit the data. I dont use events or flags I only want to send one data byte...

waclawek.jan · ‎2013-06-03

Posted on June 03, 2013 at 12:16

Works here as expected - goes all the way through to __NOP()

Post your code.

JW

#include ''stm32f4xx.h''

#include ''stm32f4xx_gpio.h''

#include ''stm32f4xx_rcc.h''

#include ''stm32f4xx_spi.h''

#include ''stm32f4xx_syscfg.h''

#include ''misc.h''

#define Open_SPI_MISO_PIN GPIO_Pin_6

#define Open_SPI_MOSI_PIN GPIO_Pin_7

#define Open_SPI_SCK_PIN GPIO_Pin_5

#define Open_SPI_GPIO_PORT GPIOA

#define Open_SPI_GPIO_CLK RCC_AHB1Periph_GPIOA

#define Open_SPI_CLK RCC_APB2Periph_SPI1

#define Open_SPI_MISO_SOURCE GPIO_PinSource6

#define Open_SPI_MOSI_SOURCE GPIO_PinSource7

#define Open_SPI_SCK_SOURCE GPIO_PinSource5

#define Open_SPI_MISO_AF GPIO_AF_SPI1

#define Open_SPI_MOSI_AF GPIO_AF_SPI1

#define Open_SPI_SCK_AF GPIO_AF_SPI1

#define Open_SPI_MISO_GPIO_PORT GPIOA

#define Open_SPI_MOSI_GPIO_PORT GPIOA

#define Open_SPI_SCK_GPIO_PORT GPIOA

#define Open_SPI SPI1

static void SPI_BusInit(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

SPI_InitTypeDef SPI_InitStructure;

//NVIC_InitTypeDef NVIC_InitStructure;

//=========================================================================================

// Enable GPIO clock

//-----------------------------------------------------------------------------------------

RCC_AHB1PeriphClockCmd(Open_SPI_GPIO_CLK, ENABLE);

//=========================================================================================

// Enable SPI clock

//-----------------------------------------------------------------------------------------

RCC_APB2PeriphClockCmd(Open_SPI_CLK, ENABLE);

//=========================================================================================

// Configure SPI GPIO

//-----------------------------------------------------------------------------------------

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Pin = Open_SPI_MISO_PIN | Open_SPI_MOSI_PIN | Open_SPI_SCK_PIN;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(Open_SPI_GPIO_PORT, &GPIO_InitStructure);

//=========================================================================================

//GPIO Alternate functions configuration

//-----------------------------------------------------------------------------------------

GPIO_PinAFConfig(Open_SPI_MISO_GPIO_PORT, Open_SPI_MISO_SOURCE, Open_SPI_MISO_AF);

GPIO_PinAFConfig(Open_SPI_MOSI_GPIO_PORT, Open_SPI_MOSI_SOURCE, Open_SPI_MOSI_AF);

GPIO_PinAFConfig(Open_SPI_SCK_GPIO_PORT, Open_SPI_SCK_SOURCE, Open_SPI_SCK_AF);

//=========================================================================================

// Configure SPI AF

//-----------------------------------------------------------------------------------------

//SPI_I2S_DeInit(SPI1);

SPI_StructInit(&SPI_InitStructure);

SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; // 328kHz

//SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

//SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

//SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft | SPI_NSSInternalSoft_Set;

SPI_Init(Open_SPI, &SPI_InitStructure);

//SPI_CalculateCRC(Open_SPI, DISABLE);

SPI_Cmd(Open_SPI, ENABLE);

}

int main(void) {

SPI_BusInit();

SPI1->DR = 0x1234;

while (!(SPI1->SR & SPI_SR_TXE));

while(1) {

__NOP();

};

}