SPI configuration problem on STM32F4 Discovery

[cagibomber]

Posted on August 07, 2012 at 18:55

Hi everyone,

I am trying to send some bytes of data on a sd-card (8GB) using SPI.

I started with wiring the sd slot and configuring the spi but I have nothing, not even the clock...

I have followed what's explained in the file spi.h and seen other post about spi but I still don't see where I am wrong.

I'd really appreciate if you can help me with it ! Thank you.

#spi-sd-card-stm32-discovery

[cagibomber]

Posted on August 07, 2012 at 18:56

Here is my code :)

________________

Attachments :

main.c : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Hzqn&d=%2Fa%2F0X0000000bQh%2FDLASaW3Ci6MPCAQHPPKTsjz0o4dbIlrZpcUZpbrm9_I&asPdf=false

[cagibomber]

Posted on August 07, 2012 at 18:57

#include ''stm32f4_discovery.h''

void SD_GPIO_Config(void);

void SPI_Config(void);

uint16_t data = 0xFF;

int main(void)

{ 

SD_GPIO_Config();

SPI_Config();

GPIO_ResetBits(GPIOD, GPIO_Pin_0);

//SPI2->DR = data; // = sent...

while(1){

while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData(SPI2, data);

}

}

void SD_GPIO_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

  

RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

  

  // Connect SPI pins to AF5

GPIO_PinAFConfig(GPIOD, GPIO_PinSource1, GPIO_AF_SPI2); // clk

GPIO_PinAFConfig(GPIOD, GPIO_PinSource2, GPIO_AF_SPI2); // mosi

GPIO_PinAFConfig(GPIOD, GPIO_PinSource3, GPIO_AF_SPI2); // miso

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;

  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;

  GPIO_Init(GPIOD, &GPIO_InitStructure);

  // Configure CS pin in output pushpull mode

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; // CS

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_Init(GPIOD, &GPIO_InitStructure);

}

void SPI_Config(void)

{

SPI_InitTypeDef  SPI_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

/* Deselect the FLASH: Chip Select high */

GPIO_SetBits(GPIOD, GPIO_Pin_0);

  /* SPI configuration */

  SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;

  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; // Or 16b

  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_4;

  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

  SPI_InitStructure.SPI_CRCPolynomial = 7;

  SPI_Init(SPI2, &SPI_InitStructure);

  SPI_Cmd(SPI2, ENABLE);

}

[Tesla DeLorean]

Posted on August 07, 2012 at 19:04

RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

Pick the correct APB

[cagibomber]

Posted on August 08, 2012 at 13:55

Thanks Clive1 !

I just changed it but still nothing happens.

[Tesla DeLorean]

Posted on August 08, 2012 at 15:53

I just changed it but still nothing happens.

Are you sure the SPI2 exits via the PD1, PD2 and PD3 pins? Doesn't look to be a valid routing.

PI1, PI2 and PI3 look better candidates, or some PBx or PCx pins.

[cagibomber]

Posted on August 08, 2012 at 17:32

Thanks for your help,

I don't have GPIO port I on stm32f4 discovery...

But I manage to make my SD-Card in SDIO mode.

I can send data to it and read it back. 

Now I would like to write my data in a way I could read it from my computer to put it in a excel file.

I think I just can create a .txt file, right ?

I downloaded your code about FATFs. From what I've understand so far, I need it to convert my data in Fat format in a file and then load it on the sd-card.

Is that the idea ?

Thank you.

[Tesla DeLorean]

Posted on August 08, 2012 at 18:37

Or perhaps a .CSV file (comma separated entries in a text file)

You'd write the data into a file in much the same way as you'd do it with STDIO file functions.

[cagibomber]

Posted on August 08, 2012 at 19:09

Ok, CSV file sound good !

So far I didn't use a DMA since I just store the data every time I need to.

Do I need to use a DMA if I want to store my data in a csv file ?

Do I need to create the .csv file in my STM32 memory and then load it on the card or can I create it in the card and then write the data in the .csv fie ?

Thanks ! :)

I'm a bit lost in all the readings...

Thank you very much for your help !

[Tesla DeLorean]

Posted on August 08, 2012 at 19:15

Not sure how DMA plays into your particular circumstances.

I'd write the CSV file a line at a time, in much the same way I did with the DIR.TXT file I was creating in the FATFs example.

It would be more efficient to buffer up larger blocks of data, but that might just over complicate things for you during initial development.

[cagibomber]

Posted on August 08, 2012 at 19:27

Ok great, I should be good since I just have to write a line every 5 minutes...

I try like that.

There's something I didn't understand with your fatfs example :

You're writing in a txt file but you don't load it, right ?

Where does it go ? I don't see it anywhere.

Thank you.