Problem with GIO_read psp function

Mikhail Akhromeev

Hello everybody!

I'm working with Omapl-138 processor; using code composer studio v 3.3.82.13, dsp/bios 5.41.02.14 and psp 01.30.01.

I'm trying transmit data from first omap to second via SPI interface. For that purposes i'm using psp functions: GIO_create, GIO_read, GIO_write.

I have no problems with transmitting data(creating gio channel and writing data to it), but have some troubles with receiving.

On receiver side i use GIO_create to create channel, it's ok, and GIO_read to get data from channel. But GIO_read returns error code -1 (generic failure).

I can see memory map of SPI1 and correct data in receive buffer, but i can't understand how to receive it via psp streaming functions...

There is my settings for spi:

    spiParams_inp = Spi_PARAMS;
    spiParams_inp.hwiNumber = 8;
    spiParams_inp.spiHWCfgData.intrLevel = TRUE;
    spiParams_inp.spiHWCfgData.masterOrSlave = Spi_CommMode_SLAVE;
    spiParams_inp.spiHWCfgData.pinOpModes = Spi_PinOpMode_SPISCS_4PIN;
    spiParams_inp.spiHWCfgData.clkInternal = FALSE;
    spiParams_inp.opMode = Spi_OpMode_INTERRUPT;

    spiParams_inp.loopbackEnabled   = FALSE;
    spiParams_inp.edmaHandle        = NULL;

    spiParams_inp.spiHWCfgData.configDatafmt[0].charLength   = 16;
    spiParams_inp.spiHWCfgData.configDatafmt[0].clkHigh      = FALSE;
    spiParams_inp.spiHWCfgData.configDatafmt[0].lsbFirst     = FALSE;
    spiParams_inp.spiHWCfgData.configDatafmt[0].oddParity    = FALSE;
    spiParams_inp.spiHWCfgData.configDatafmt[0].parityEnable = FALSE;
    spiParams_inp.spiHWCfgData.configDatafmt[0].phaseIn      = TRUE;
    spiParams_inp.spiHWCfgData.configDatafmt[0].waitEnable   = FALSE;
    spiParams_inp.spiHWCfgData.csDefault = 0x1;

Creating GIO channel this way:

   chanParams.hEdma = NULL;
    spiHandle_inp = GIO_create("/Spi1",IOM_INPUT,NULL,&chanParams,NULL);

    if (NULL != spiHandle_inp)
    {
        LOG_printf(&trace,"GIO_create OK! \n");
    }
    else
    {
        LOG_printf(&trace,"GIO_create ERROR! \n");
    }

and trying to read data:

size = sizeof(buf_dest)/sizeof(uint16_t);
devStatus = GIO_read(spiHandle_inp, &buf_dest, &size);

if (IOM_COMPLETED == devStatus)
       {
        LOG_printf(&trace,"GIO_read OK! \n");
    }
    else
    {
        LOG_printf(&trace,"GIO_read ERROR! \n");
    }

If everybody solved such problem - please help! Thanks in advance!

over 13 years ago

0 Norman Wong over 13 years ago

Guru 26430 points

I can't tell from the code fragment that you posted but I think you have to pass in Spi_DataParam structure to GIO_read(). I've used the master mode. Never slave mode. Here's a guess:

Spi_DataParam       dataparam;

dataparam.outBuffer    = (Uint8*)0;
dataparam.inBuffer     = (Uint8*)buf_dest;
dataparam.bufLen       = sizeof(buf_dest); /* In bytes */
dataparam.chipSelect   = YOUR_CHIP_SELECT_MASK; /* Used only in Master????? */
dataparam.dataFormat   = Spi_DataFormat_0;
dataparam.flags        = 0; /* 0 or Spi_CSHOLD */
dataparam.gpioPinNum   = 0; /* Not used */
dataparam.csToTxDelay = 0; /* Not used */

size = sizeof(dataparam);
devStatus = GIO_read(spiHandle_inp, &dataparam, &size);

Note that PSP 01.30.01 has a bug with 16 bit words. Maybe siwtch to 8 bits. My 16 bit patch here:

http://e2e.ti.com/support/embedded/f/355/t/130781.aspx

0 Mikhail Akhromeev over 13 years ago in reply to Norman Wong

Prodigy 30 points

Thanks for reply, Norman!
I changed settings to work with 8-bit data.
Applied your parameters and received error code -13 when reading with GIO_read... But the last error code,
described in help is -12. Also I cant see correctly received data in memory window, like in previos case. Problem not resolved.

I attempted to use GIO_control to reset channel:

Stats spiStats;

status = GIO_control(spiHandle_inp, IOM_CHAN_RESET, &spiStats);
if(IOM_COMPLETED == status)
{
LOG_printf(&trace,"GIO_control OK! \n");
}
else
{
LOG_printf(&trace,"GIO_control ERROR! \n");
}

I received error code -10(illegal arguments used). What's wrong? Is it incorrect to use Stats structure here?

It defined in "pspdrivers_01_30_01\packages\ti\pspiom\spi\spi.h" ? How can I use it?

I also tried this function with NULL 3rd parameter and received same error code.

0 Norman Wong over 13 years ago in reply to Mikhail Akhromeev

Guru 26430 points

Not sure if I can help much more. Slave mode looks to be much different than master. I can't find any slave examples in the PSP package. Hopefully some BIOSPSP gurus will speak up. Some notes:

Errors codes:

iom.h
IOM_EBADIO        -1
IOM_ETIMEOUT      -2
IOM_ENOPACKETS    -3
IOM_EFREE         -4
IOM_EALLOC        -5
IOM_EABORT        -6
IOM_EBADMODE      -7
IOM_EOF           -8
IOM_ENOTIMPL      -9
IOM_EBADARGS      -10
IOM_ETIMEOUTUNREC -11
IOM_EINUSE        -12

SpiLocal.h
Spi_RECEIVE_OVERRUN_ERR -12
Spi_BIT_ERR             -13
Spi_DESYNC_ERR          -14
Spi_PARITY_ERR          -15
Spi_TIMEOUT_ERR         -16
Spi_DATALENGTH_ERR      -17
Spi_CANCEL_IO_ERROR     -18

Looking at the SPI driver source code, it does not appear to support IOM_CHAN_RESET. These are the only supported messages:
Spi_IOCTL_CANCEL_PENDING_IO, cmdArg unused
Spi_IOCTL_SET_CS_POLARITY, cmdArg is pointer to Spi_CsPolarity
Spi_IOCTL_SET_POLLEDMODETIMEOUT, cmdArg is pointer to Int32

0 Mikhail Akhromeev over 13 years ago in reply to Norman Wong

Prodigy 30 points

There were biterror and overrun error bits set in flag status register (0x01F0E010),
but I didn't thought it can prevent me from achieving data. Tried to resolve problem by wtiting 1 to corresponding
bits (4 for biterr and 6 for overrun) - no effect... Trully don't understand how to handle
this errors with BIOS API.
Turned off all interrupts in Spi_local.h except "receiver full" and "transmitter empty". Data received correctly!
Thanks for idea - to check Spi_local.h!

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Problem with GIO_read psp function