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McBSP as SPI master problem

Started by SJ Hsu August 15, 2006
Hi, I have used TMS320VC5510 DSK to connect with a RF module through SPI.
I encounter a problem that using scope I can see the correct timing
of transmit data, receive data, FSX, and CLKX. But after that RRDY in
SPCR10 does not pulled high.

More detail, I try to write a register in RF module and read it back,
checking whether it is the same. I'm sure that in scope I see the writing
did happens and RF module did transmit the register data back to me. But I
did not see any change in RRDY.

In the reason I can't receive data by detecting RRDY. Does there have some
procedure that I've lost to do? I would be very appreciated for your
helping.

Regards, SJ Hsu
------------------------------------------------------------------------
ps1. The RF module works as following sequences : 
------------------------------------------------------------------------
     A. Write:
        1. Generate FSX as slave enable, generate CLKX (SCLK).
        2. First write 8 bits address.
        3. Then write 8 bits data.
     B. Read:
        1. Generate FSX as slave enable, generate CLKX (SCLK).
        2. First write 8 bits address.
        3. Then RF module will reponse 8 bits data back. RF module will
           not care the incoming data while it is responding.
------------------------------------------------------------------------
ps2. Following is my setting about SPI and my code. 
------------------------------------------------------------------------
MCBSP_Config spi_Init = {
    0x1830,        /*  Serial Port Control Register 1   */
    0x0130,        /*  Serial Port Control Register 2   */
    0x0040,        /*  Receive Control Register 1   */
    0x0005,        /*  Receive Control Register 2   */
    0x0040,        /*  Transmit Control Register 1   */
    0x0005,        /*  Transmit Control Register 2   */
    0x001f,        /*  Sample Rate Generator Register 1   */
    0x2000,        /*  Sample Rate Generator Register 2   */
    0x0000,        /*  Multichannel Control Register 1   */
    0x0000,        /*  Multichannel Control Register 2   */
    0x0e09,        /*  Pin Control Register   */
    0x0000,        /*  Receive Channel Enable Register Partition A   */
    0x0000,        /*  Receive Channel Enable Register Partition B   */
    0x0000,        /*  Receive Channel Enable Register Partition C   */
    0x0000,        /*  Receive Channel Enable Register Partition D   */
    0x0000,        /*  Receive Channel Enable Register Partition E   */
    0x0000,        /*  Receive Channel Enable Register Partition F   */
    0x0000,        /*  Receive Channel Enable Register Partition G   */
    0x0000,        /*  Receive Channel Enable Register Partition H   */
    0x0000,        /*  Transmit Channel Enable Register Partition A   */
    0x0000,        /*  Transmit Channel Enable Register Partition B   */
    0x0000,        /*  Transmit Channel Enable Register Partition C   */
}

void spi_init ()
{
    MCBSP_FSET(SPCR10, RRST, 0) ;   // reset Rx
    MCBSP_FSET(SPCR20, XRST, 0) ;   // reset Tx
    MCBSP_FSET(SPCR20, FRST, 0) ;   // reset frame-sync logic
    MCBSP_FSET(SPCR20, GRST, 0) ;   // reset sample rate generator

    MCBSP_config(hMcbsp0, &spi_Init) ;

    MCBSP_FSET(SPCR20, GRST, 1);    // enable sample rate generator
    MCBSP_FSET(SPCR20, FRST, 1);    // enable frame-sync logic

    MCBSP_FSET(SPCR10, RRST, 1);    // set Rx
    MCBSP_FSET(SPCR20, XRST, 1);    // set Tx

}



void spi_sw(UINT8 addr, UINT8* dataPtr)
{
    //UINT16 i ;

    addr = (addr << 9) | 0x0100 ;
    addr = addr | (*dataPtr) ;

    while (MCBSP_FGET(SPCR20,XRDY)== 0) {}

    // write address to DXR
    MCBSP_RSET (DXR20,0) ;
    MCBSP_RSET (DXR10,addr);

    //for(i = 0; i < 1000; i++) ;
}



void spi_sr(UINT8 addr, UINT8* dataPtr)
{
    addr = ((UINT16)addr << 9) ;

    while (MCBSP_FGET(SPCR20,XRDY)== 0) {}

    // write address to DXR
    MCBSP_RSET (DXR20,0) ;
    MCBSP_RSET (DXR10,addr);

    while (MCBSP_FGET(SPCR10,RRDY) == 0) {}

    *dataPtr = MCBSP_RGET(DRR10) ;
}



UINT8 d = 0xaa ;
UINT8 r = 0x01 ;

void main()
{
    spi_init() ;

    spi_sw(0x01, &d) ;

    spi_sr(0x01, &r) ;

    printf("The returned value : %d", r) ;

}


Sorry everyone, I post this in wrong place and I can not find where to
delete this post. Please recept my apology.

Best Regards,
SJ Hsu

>Hi, I have used TMS320VC5510 DSK to connect with a RF module through
SPI.
>I encounter a problem that using scope I can see the correct timing >of transmit data, receive data, FSX, and CLKX. But after that RRDY in >SPCR10 does not pulled high. > >More detail, I try to write a register in RF module and read it back, >checking whether it is the same. I'm sure that in scope I see the
writing
>did happens and RF module did transmit the register data back to me. But
I
>did not see any change in RRDY. > >In the reason I can't receive data by detecting RRDY. Does there have
some
>procedure that I've lost to do? I would be very appreciated for your >helping. > >Regards, SJ Hsu >------------------------------------------------------------------------ >ps1. The RF module works as following sequences : >------------------------------------------------------------------------ > A. Write: > 1. Generate FSX as slave enable, generate CLKX (SCLK). > 2. First write 8 bits address. > 3. Then write 8 bits data. > B. Read: > 1. Generate FSX as slave enable, generate CLKX (SCLK). > 2. First write 8 bits address. > 3. Then RF module will reponse 8 bits data back. RF module will > not care the incoming data while it is responding. >------------------------------------------------------------------------ >ps2. Following is my setting about SPI and my code. >------------------------------------------------------------------------ >MCBSP_Config spi_Init = { > 0x1830, /* Serial Port Control Register 1 */ > 0x0130, /* Serial Port Control Register 2 */ > 0x0040, /* Receive Control Register 1 */ > 0x0005, /* Receive Control Register 2 */ > 0x0040, /* Transmit Control Register 1 */ > 0x0005, /* Transmit Control Register 2 */ > 0x001f, /* Sample Rate Generator Register 1 */ > 0x2000, /* Sample Rate Generator Register 2 */ > 0x0000, /* Multichannel Control Register 1 */ > 0x0000, /* Multichannel Control Register 2 */ > 0x0e09, /* Pin Control Register */ > 0x0000, /* Receive Channel Enable Register Partition A */ > 0x0000, /* Receive Channel Enable Register Partition B */ > 0x0000, /* Receive Channel Enable Register Partition C */ > 0x0000, /* Receive Channel Enable Register Partition D */ > 0x0000, /* Receive Channel Enable Register Partition E */ > 0x0000, /* Receive Channel Enable Register Partition F */ > 0x0000, /* Receive Channel Enable Register Partition G */ > 0x0000, /* Receive Channel Enable Register Partition H */ > 0x0000, /* Transmit Channel Enable Register Partition A */ > 0x0000, /* Transmit Channel Enable Register Partition B */ > 0x0000, /* Transmit Channel Enable Register Partition C */ >} > >void spi_init () >{ > MCBSP_FSET(SPCR10, RRST, 0) ; // reset Rx > MCBSP_FSET(SPCR20, XRST, 0) ; // reset Tx > MCBSP_FSET(SPCR20, FRST, 0) ; // reset frame-sync logic > MCBSP_FSET(SPCR20, GRST, 0) ; // reset sample rate generator > > MCBSP_config(hMcbsp0, &spi_Init) ; > > MCBSP_FSET(SPCR20, GRST, 1); // enable sample rate generator > MCBSP_FSET(SPCR20, FRST, 1); // enable frame-sync logic > > MCBSP_FSET(SPCR10, RRST, 1); // set Rx > MCBSP_FSET(SPCR20, XRST, 1); // set Tx > >} > > > >void spi_sw(UINT8 addr, UINT8* dataPtr) >{ > //UINT16 i ; > > addr = (addr << 9) | 0x0100 ; > addr = addr | (*dataPtr) ; > > while (MCBSP_FGET(SPCR20,XRDY)== 0) {} > > // write address to DXR > MCBSP_RSET (DXR20,0) ; > MCBSP_RSET (DXR10,addr); > > //for(i = 0; i < 1000; i++) ; >} > > > >void spi_sr(UINT8 addr, UINT8* dataPtr) >{ > addr = ((UINT16)addr << 9) ; > > while (MCBSP_FGET(SPCR20,XRDY)== 0) {} > > // write address to DXR > MCBSP_RSET (DXR20,0) ; > MCBSP_RSET (DXR10,addr); > > while (MCBSP_FGET(SPCR10,RRDY) == 0) {} > > *dataPtr = MCBSP_RGET(DRR10) ; >} > > > >UINT8 d = 0xaa ; >UINT8 r = 0x01 ; > >void main() >{ > spi_init() ; > > spi_sw(0x01, &d) ; > > spi_sr(0x01, &r) ; > > printf("The returned value : %d", r) ; > >} > > >
SJ Hsu wrote:
> Sorry everyone, I post this in wrong place and I can not find where to > delete this post. Please recept my apology.
Display the post in your newsreader and use the "delete" key on your keyboard. Not every news server honors a delete request, but many do. (Yahoo might not.) Jerry -- Engineering is the art of making what you want from things you can get. &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
Hi,

have a look at MCBSP_SPCR_RINTM_RRDY bit in your serial port control
register. You can view all the registers related to the mcbsp interface
via code composer studio and if the DRR1/0 register isn=B4t written
something is wrong with your port configuration - maybe the RRDY irq
mode is enabled but the receiver is waiting for a wrong word length.

I use the mcbsp with the c6 dsp family and configure these interfaces
also for spi. If you use the chip support library (CSL) you get more
readerfriendly code.

regards
stephan