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Rogers.Gary
Rogers.Gary
Senior II
June 11, 2017
Question

H3LIS200DL SPI Configuration & Read

  • June 11, 2017
  • 12 replies
  • 2122 views
Posted on June 12, 2017 at 00:54

Hello:

According to all the documentation I can find, I have configured the STM32F4 correctly to interface to the H3LIS200DL accelerometer. This is for use in SPI3 (AF6). Somehow, there's still something amiss. When I try to send/read the 'WHO_AM_I' register, it only returns 0. Here's my setup code:

void configH3LIS200DL( void )

{

    GPIO_InitTypeDef GPIO_InitStructure;

    SPI_InitTypeDef  SPI_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);

    //Initialize pins for SPI functionality

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;

    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_NOPULL;

    GPIO_Init(GPIOC, &GPIO_InitStructure);

    

    //Initialize Chip Select pin

    GPIO_InitStructure.GPIO_Pin = ACCHI_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);

    GPIO_SetPinHigh(GPIOD, ACCHI_CS);    

    SPI_I2S_DeInit(SPI3);

    GPIO_PinAFConfig (GPIOC, GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12, GPIO_AF_SPI3);

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_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_32;

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 0;

    SPI_Init(SPI3, &SPI_InitStructure);

    SPI_Cmd(SPI3, ENABLE);

}

//the function to send and receive

uint8_t SPI3_Send( uint16_t dataIn )

{

    GPIO_SetPinLow(GPIOD, GPIO_Pin_0);

    // write data to be transmitted to the SPI data register

    SPI3->DR = dataIn;

    // wait until transmit complete

    while( !(SPI3->SR & SPI_I2S_FLAG_TXE) );

    // wait until receive complete    

    while( !(SPI3->SR & SPI_I2S_FLAG_RXNE) );

    // wait until SPI is not busy anymore

    while( SPI3->SR & SPI_I2S_FLAG_BSY );

    GPIO_SetPinHigh(GPIOD, GPIO_Pin_0);        

    

    // return data from SPI3 register

    return SPI3->DR;

}

In main:

    uint16_t rtnValue = SPI3_Send( H3LIS200DL_WHO_AM_I );  //==0xF

    printf('value = %x\n', rtnValue);    

//I also tried a dummy byte after...still no go

    rtnValue = SPI3_Send( 0x00 );

    printf('value = %x\n', rtnValue);

   

I have tried both 8bit and 16bit, and changing the prescaler. I have confirmed the CS line is going Low/high. I have not done any checks on the data lines, but I have other SPI devices (FRAM) that are on SPI1 and they are working OK. CLK/MISO/MOSI are conected correctly.

Can someone explain why this would be happening? What could be the problem?

Thank you...

    This topic has been closed for replies.

    12 replies

    netstv
    netstv
    Associate II
    June 11, 2017
    Posted on June 12, 2017 at 01:05

    Can you hook up a scope to see what the lines tell you?  Everytime I do a board bringup, I always have the hardware guys give me one board with wires or create testpoints so I can connect a scope and see the lines.

    I don't see anything wrong with what you have setup... However, I don't know what SPI3_Send does.

    So things that I would check:

    1.  Does your chip select line go from high to low at the start.

    2.  Is your polarity and clock phase setup properly.  (I.E. SPI Mode)

    3.  Do you see your clock line move

    4.  Do you see the data lines move.

    Also, are there other devices on this SPI bus?

    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 11, 2017
    Posted on June 12, 2017 at 01:14

    Hi

    1 - Yes, I confirmed that CS goes low

    2 - The polarity and clock phase are taken from an example using LIS302DL. I am assuming (And I would hope it's correct)  that all of ST's accelerometers would have these parameters the same.

    3 - Have not checked, but again - I have a device on SPI1 that functions with no issues.

    4 - No other devices on SPI3.

    BTW - the SPI3_Send function code is provided.

    Thanks

    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 11, 2017
    Posted on June 12, 2017 at 01:35

    Hi again,

    I have checked the CS line, it is transitioning HIGH->LOW->HIGH. In this transition (or at all) , SCK, MOSI and MISO are NOT toggling. What could be wrong with the configuration?

    Thanks....

    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 11, 2017
    Posted on June 12, 2017 at 01:45

    I have discovered that Pin2 and Pin 3, both marked as NC in the data sheet, are grounded. Is this potentially the problem?

    netstv
    netstv
    Associate II
    June 11, 2017
    Posted on June 12, 2017 at 01:47

    Don't  you have to configure the alternate function for those pins?

    Something like:

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 11, 2017
    Posted on June 12, 2017 at 01:51

    Done already, please check the code I have posted:

    GPIO_PinAFConfig (GPIOC, GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12, GPIO_AF_SPI3);

    Tesla DeLorean
    Tesla DeLorean
    Guru
    June 12, 2017
    Posted on June 12, 2017 at 02:29

    Your code isn't valid. PinAFConfig takes singular PinSource arguments (an index), not OR'd together Pin arguments (a mask). See form provided by Steve above.

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 12, 2017
    Posted on June 12, 2017 at 02:55

    thanks. Changed to this, and still no clock:

       SPI_I2S_DeInit(SPI3);

        GPIO_PinAFConfig(GPIOC, GPIO_Pin_10, GPIO_AF_SPI3);

        GPIO_PinAFConfig(GPIOC, GPIO_Pin_11, GPIO_AF_SPI3);

        GPIO_PinAFConfig(GPIOC, GPIO_Pin_12, GPIO_AF_SPI3);    

        SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

        SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

        SPI_InitStructure.SPI_DataSize = SPI_DataSize_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_32;

        SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

        //SPI_InitStructure.SPI_CRCPolynomial = 0;

        SPI_Init(SPI3, &SPI_InitStructure);

        SPI_Cmd(SPI3, ENABLE);

    also, thanks steve for pointing that out, it wasn't clear that was the problem.

    clive1, could it be that pins 2 and 3 are grounded? the data sheet is not explicit that it is not permitted (or a problem) it was done by mistake.

    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 12, 2017
    Posted on June 12, 2017 at 03:04

    ok, I see what I did wrong. Should be 'GPIO_PinSourcex' just like that, according to gpio_c header file. It's now returning 0xFF, or 0xffff (if I set 8 or 16 bit)

    I am now getting a clock signal as well!

    Is there still a setting problem?

    thanks!

    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 12, 2017
    Posted on June 12, 2017 at 04:33

    Sorry to bother...

    Having a decent example would make a difference. I have tried to write and read the device several ways, and still get back 0xFF.

    Can someone point to just one example using CMSIS standard libraries that shows how to configure, write and read any ST MEMS accelerometer device? I can't find one here, or anywhere.

    Rogers.Gary
    Rogers.GaryAuthor
    Senior II
    June 12, 2017
    Posted on June 12, 2017 at 04:59

    clive1,

    I found your examples in the forum of write and read on SPI:

    uint8_t SD_WriteByte(uint16_t Data)

    {

      /*!< Wait until the transmit buffer is empty */

      while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) == RESET);

       

      /*!< Send the byte */

      SPI_I2S_SendData(SPI3, Data);

       

      /*!< Wait to receive a byte*/

      while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_RXNE) == RESET);

       

      /*!< Return the byte read from the SPI bus */

      return SPI_I2S_ReceiveData(SPI3);

    }

    uint8_t SD_ReadByte(void)

    {

      /*!< Wait until the transmit buffer is empty */

      while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) == RESET);

     

      /*!< Send the byte */

      SPI_I2S_SendData(SPI3, DUMMY_BYTE);

     

      /*!< Wait until a data is received */

      while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_RXNE) == RESET);

     

      /*!< Return the byte read from the SPI bus */

      return SPI_I2S_ReceiveData(SPI3);

    }

    Here is the configuration I am using:

       SPI_I2S_DeInit(SPI3);

        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_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_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_Init(SPI3, &SPI_InitStructure);

        SPI_Cmd(SPI3, ENABLE);

    When I try to write and read the 'WHO_AM_I', I still get back 0xff.

    GPIO_SetPinLow(GPIOD, ACCHI_CS);

    SD_WriteByte( LIS200DL_WHO_AM_I );        

    uint8_t rtnValue = SD_ReadByte();

    GPIO_SetPinHigh(GPIOD, ACCHI_CS);      

    printf('value = %x\n', rtnValue);     

    rtnValue is always 0xff. I have also tried asserting CS low, then high separately after the write and read and it made no difference.

    What gives?

    I really would appreciate some help, thanks to anyone who can clue me in.

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