Hi
My board is based on a AT91SAM7X (OS is eCOS). I have configured TC2 to produce a TIOA2-Pulse every ms. Then I have configured the ADC to scan all 8 channels and to be triggered by TIOA2 and it should store scanned results to memory using its Peripheral DMA Controller (PDC). An RxBUF-Interrupt should finally call a routine that gets the results from the memory buffer.

Result: The ADC seems to perform a scan, but the PDC does not do anything. I can see the DRDY-Flag, but never do I get a RXBUF-Flag (and hence no such interrupt). What could be the cause of this problem?

I assume that there is no need to special configuration of the TIOA2-pin in this context? I assume that TIOA2 is internally routed to the ADC - as instructed by the cor. fields in the device registers. Actually, on the 7x, TIOA2 is multiplexed between PIO-PB27, TIOA2, PWM0 and AD0. I have configured the pin for AD0 (channel 0 of the ADC).
Then I assume that each conversion complete produces a DMA-transfer of the result until the specified number of data have been transfered. That's what I understand from the Manual (6120G-ATARM-08-Oct-07). But see above .
Regards Roe
PS: Oh dear, I forgot the ADC_PTCR register. Putting a one there and it worked - hence ---> solved

Hi Roe,

I'm thinking to use TIOA2 to trigger AD conversion and DMA to save converted data, I want to get A/D as fast as possible.

Should I check the AT91C_ADC_DRDY bit to make sure the data is ready?

Is it possible to share your code for PDC and AD conversion part?

Regards
Samuel