2008-06-03 03:19:58     ppi driver

2008-06-03 03:19:58     ppi driver

Pranay Upadhyay (INDIA)

Message: 56603   

Hello sir,

   I am getting following print on the terminal...In this we found that for first frame there is interrupt but after the sending one frame there is no interrupt .

root:~> video_test

PPppi_read(0x006DFE34, 349920)

blackfin_dcache_invalidate_range:DONEppi status register 0x0000

set_dma_start_addr() : BEGIN

set_dma_start_addr() : END

dma config register 0x109A in read function before enable dma

enable_dma() : BEGIN

enable_dma() : END

dma config register 0x109B in read function after enable dma

ppi after status register 0x0000

PPI wait_event_interruptible

I0 open success

ppi_irq:

ppi_irq: wake_up_interruptible pdev->done=1

ppi_irq: return

PPI wait_event_interruptible done

ppi_read: return

rawImgBuff read is complete

PPppi_write(0x603F10, 900900)

I1ppi status register 0 in write function)

dma config register 0x1098 in write function before enable dma

enable_dma() : BEGIN

enable_dma() : END

dma config register 0x1099 in write function after enable dma

PPI wait_event_interruptible

open success

PPI wait_event_interruptible done

pdev->done 1

buffeppi_read(0x006DFE34, 349920)

blackfin_dcache_invalidate_range:DONEppi status register 0x0000

set_dma_start_addr() : BEGIN

set_dma_start_addr() : END

dma config register 0x109A in read function before enable dma

enable_dma() : BEGIN

enable_dma() : END

dma config register 0x109B in read function after enable dma

ppi after status register 0x0000

PPI wait_event_interruptible

r write is complete

PPI0 open success

After pressing the ctrl+c I got this ...

PPI wait_event_interruptible ierr

     Please send me the any suggestion about this problem.

                        -Regards

                           Pranay

QuoteReplyEditDelete

2008-06-03 07:10:51     Re: ppi driver

Appalayagari Sreedhar (INDIA)

Message: 56620   

Dear Pranay,

Assuming that u are working with BF533.

You are not properly configuring the DMA0_Config register.

I think u are missing the

DI_SEL (Data interrupt Timing Select Option ) DMA0_Config register, u are programming in Autobuffer mode.

Interrupts are generated by the pheripheral/Pheripheral DMA if used,  in this case PPI DMA channel.

Check the DMA config register and also refer to the Hardware reference manual.

Best Regards,

Sreedhar.

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2008-06-03 11:08:51     Re: ppi driver

Pranay Upadhyay (INDIA)

Message: 56630   

Hello sir,

  Thanks for reply. I am using the BF 561 ez-kit for ppi driver.In the uClinux-dist we can use only core-B.I have enable the DI_EN .I  am using the autobuffer mode.After transferring one frame there is no dma interrupt and my program hang on the "PPI wait_event_interruptible" because the return value of function  ierr = wait_event_interruptible(*(pdev->rx_avail), pdev->done); is  zero so "PPI wait_event_interruptible done" is not occur as use in ppi0 running driver.What is the problem I am not getting.Please reply.

                    -Regards

                      Pranay