topic Re: SGPIO camera interface in LPC Microcontrollers

SGPIO camera interface

dimitrissideris — Tue, 31 Jan 2017 15:52:56 GMT

Is there any LPCOpen SGPIO camera example except from AN11343?

Re: SGPIO camera interface

Carlos_Mendoza — Fri, 03 Feb 2017 18:41:45 GMT

Hi Dimitris,

We have no other LPCOpen example but here is another application note:

http://cache.nxp.com/documents/application_note/AN11196.zip

Or this one that uses the SCT to interface with the camera:

http://cache.nxp.com/assets/documents/data/en/application-notes/AN11365.pdf

Hope it helps!

Best Regards,
Carlos Mendoza
Technical Support Engineer

Re: SGPIO camera interface

dimitrissideris — Mon, 06 Feb 2017 08:54:56 GMT

Thanks for the reply Carlos.

Yes i have checked the application notes you mentioned above.

Although they are useful, they all are for Keil boards.

I though maybe there is some lpcxrpresso lpcopen sgpio examples so that i can use them as base for my implementation.

I wonder why lpcopen examples don't have at all any spgio periph example

Re: SGPIO camera interface

dimitrissideris — Mon, 06 Feb 2017 09:55:06 GMT

I would like some help for the an11343 example code implementation.

The example is a dual core M0-M4 implementation.

The SGPIO interrupt handler lies inside M0 example code and it handles the sgpio interrupts. The slice and pin configuration of sgpio lie in M4 example code. Ok straight forward.

I see that in M4 example code there is a Gpio interrupt handler which is actually the VSYNC interrupt hanlder. (Vsync is connected to gpio pin not sgpio).

// GPIO IRQ slot 6 is used by VSync IRQ, common to all cameras
void ATR_RAMCODE GPIO6_IRQHandler(void)
{
   LPC_GPIO_PIN_INT_Type *pPinInt = LPC_GPIO_PIN_INT;
   // leave M0 to process GPIO6 int
   if (pPinInt->RISE & BVON(PIQ_VSYNC))
   {
       // rising edge
       // previous frame is completed
       pPinInt->RISE = BVON(PIQ_VSYNC);
       NVIC_DisableIRQ(SGPIO_IINT_IRQn);
       SGPStop();
       s_ccb.vsyncCnt++;
       // judge whether is the previous frame is received
       if (s_ccb.sgpIntPerFra != 0)
       {
           __set_PRIMASK(1);
           s_ccb.rdyRxBufCnt++;
           #if 0 == IS_TWIN_RXBUF
           #else
           s_ccb.rcvTglBit ^= 1;
           #endif
           __set_PRIMASK(0);
           s_ccb.vsyncEffCnt++;
           s_ccb.sgpIrqCntInPrevFra = s_ccb.sgpIntPerFra;
       }
       s_ccb.sgpIntPerFra = 0;
       if (s_ccb.freeRxBufCnt)

           s_ccb.freeRxBufCnt--;
           #if 0 == IS_TWIN_RXBUF
               s_ccb.pBuf = s_ccb.pRcvDbBuf->aa32[0];
           #else
               s_ccb.pBuf = s_ccb.pRcvDbBuf->aa32[s_ccb.rcvTglBit];
           #endif
           s_ccb.pBufEnd = s_ccb.pBuf + (CAP_BUF_SIZE / 4);
           SGPGetRdyToGo();

               __sev();
       }
   }

There is some comment " // leave M0 to process GPIO6 int".

Is this true;

If not and comments are wrong,

sgpio interrupt hander is in M0 code and gpio handler for vsync is in M0?

Re: SGPIO camera interface

dimitrissideris — Mon, 06 Feb 2017 11:11:59 GMT

Also in M0 example code of AN11343 there are two sgpio interrupt handlers.

void ATR_RAMCODE SGPIO_IRQHandler(void)

void SGPIO_IRQHandlerB (void)

Why is that for?

Re: SGPIO camera interface

maneesh_pawar — Sat, 22 Aug 2020 10:01:20 GMT

I am unable to locate the project files and code used in the Application Note http://cache.nxp.com/assets/documents/data/en/application-notes/AN11365.pdf

Can you please share it.

Regards