Hello, I am developing a cypress FX2 firmware. I am using GPIF master mode. I have generated the waveform(single_read, single_write, FIFO_read, FIFO_write)using the GPIF_designer, single_read and single_write is ok, FIFO_read is almost ok except the actural wave number is half the c code defined, FIFO_write transaction counter does not decrease, the GPIFTRIG GPIF done bit is not set. so write cycle will not stop, can any one help?

Here is the code.

void TD_Init(void)             // Called once at startup

{

  // set the CPU clock to 48MHz

  CPUCS = ((CPUCS & ~bmCLKSPD) | bmCLKSPD1);

  SYNCDELAY;

  EP2CFG = 0xA0;

  SYNCDELAY;

  EP4CFG = 0x00;

  SYNCDELAY;

  EP6CFG = 0xE0;

  SYNCDELAY;

  EP8CFG = 0x00;

  SYNCDELAY;

  FIFORESET = 0x80;

  SYNCDELAY;

  FIFORESET = 0x02;

  SYNCDELAY;

  FIFORESET = 0x06;

  SYNCDELAY;

  FIFORESET = 0x00;

  SYNCDELAY;

  EP2FIFOCFG = 0x01;

  SYNCDELAY;

  EP2FIFOCFG = 0x11;

  SYNCDELAY;

  EP6FIFOCFG = 0x09;

  SYNCDELAY;

  GpifInit (); // initialize GPIF registers

  SYNCDELAY;

  EP2GPIFFLGSEL = 0x01; // For EP2OUT, GPIF uses EF flag

  SYNCDELAY;

  EP6GPIFFLGSEL = 0x02; // For EP6IN, GPIF uses FF flag

  SYNCDELAY;

}

void TD_Poll(void)

{

  if( GPIFTRIG & 0x80 )               // if GPIF interface IDLE

  {

    if ( ! ( EP24FIFOFLGS & 0x02 ) )  // if there's a packet in the peripheral domain for EP2

    {

 if ( GPIFREADYSTAT&0x02  )           // if the external FIFO is not full EXTFIFONOTFULL

          {

 SYNCDELAY;

          GPIFTCB1 = 0x01;            // setup transaction count (512 bytes/2 for word wide -> 0x0100)

          SYNCDELAY;

          GPIFTCB0 = 0x00;

          SYNCDELAY;               

          GPIFTRIG = GPIF_EP2;          // launch GPIF FIFO WRITE Transaction from EP2 FIFO

          SYNCDELAY;

          //FIFO write waveform is triggered, but nerver done, why?

          while( !( GPIFTRIG & 0x80 ) ) // poll GPIFTRIG.7 GPIF Done bit  

          {

           ;                // the code will stop here

          }

          SYNCDELAY;

          }

    }

  }

}

Hi,

As you said fifo write waveform is triggered but does not end, so try generating the waveform only once , you can do this by adding a flag in the if condition. If the problem does not occur then the issue is with the loop(ie if condition) in the TD_Poll which is making the waveform to trigger again and again.

Now if this does not solve the problem then the issue is with the gpif waveform.In this case I would request you to attach your uvision2 project as well as the gpif file so that I can check it at my end.

-shub

 Hi shub,

     Thanks for your quick reply, I have tried serval different if condition, it seems doesn't solve the problem. I attached two project, GPIF.zip and firmware.zip, GPIF.zip is the what I am testing, and firmware.zip is another demo code. Both of them have the problem during FIFO write test. Can you help me check the root cause? anything not clear, please don't hesitate to let me known, Thanks!

   Br,

Hi,

I opened the gpif file in GPIF folder using gpif designer and found that the gpif fifo write waveform is not defined.This could be the problem. I have attached a screenshot.Please check and rectify this issue.

-Shubham

 Hi Shub,

      you are right, it is the waveform problem. another question, does Cy7c68013 support usb boot? why  boot from udisk(using Cy7c68013) is ok on Dell computer  while not on compatible computer? The bios version or the usb speed mode or some others? I have tyied usb-hdd fdd and zip mode. Do you have any idea?

      Thanks!

Br,

This attached assembly code should execute a GPIO FIFO Write.

It does not.

However, after fiddling with it a couple of hours (part warms up??) it works fine!

If I then unplug the USB, wait some moments, then plug it in and execute, the FIFO Write doesn't work!(same code, see attached.)

Any ideas ?

Thanks,

Hi Stewart,

Attachment is missing.

Regards,

Gayathri

 Hi Stewart,

I could see that you are assigning count only once to GPIFTCB0 (which is equal to 1 Byte), but you are triggering the transfer twice, using GPIFTRIG and using EP6GPIFTRIG. Please check the same. Also, I wanted to confirm one thing: are you isng GPIF designer for forming the GPIF.c file which you are importing to your project? If so, please attach the screenshots for the FIFOWR waveform.

Can you also please attach the part of code where you are doing the initializatn stuffs, i.e, configuring the buffering, direction of Endpoints etc.

Regards,

Gayathri

"you are assigning count only once to GPIFTCB0 (which is equal to 1 Byte)"

> GPIFTCB0 is reassigned EVERY LOOP.

"you are triggering the transfer twice, using GPIFTRIG and using EP6GPIFTRIG."

>Ep6gpiftrg is COMMENTED OUT.

"are you isng GPIF designer for forming the GPIF.c file "

>NO

"please attach the part of code where you are doing the initializatn stuffs, i.e, configuring the buffering, direction of Endpoints etc."

>GPIF initialization in in the file. (Endpoint buffering & direction are default values - ep2,4 OUT, ep6,8 IN.)

 Hi Stewart,

I din't notice the ";" before EP6GPIFTRIG statement. Why is that you are triggering GPIF transactions 1 byte at a time? Please create a case at http://www.cypress.com/ -> Support -> Technical Support so that one of our engineers can take a look at this. It would be easier to debug.

Regards,

Gayathri