SAM4E16E DAC for 2 channel with PDC run only at 29Ksps

Discussion around product based on ARM Cortex M4 core.

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caokhoa
Posts: 7
Joined: Wed Aug 13, 2014 12:06 pm

SAM4E16E DAC for 2 channel with PDC run only at 29Ksps

Wed Aug 13, 2014 1:30 pm

I have 2 problem with the on chip DAC:
1/ it run normal (at 1Msps with PDC) on one channel only. But when I use two channel parallel (in TAG mode), the speed I got is just approximately 29Ksps.
The trigger I use here is the Timer counter trigger (trigger every 1uS). 

2/When I use DMAC (to copy value from memory (buffer) to memory (DACC_CDR) the max speed is only approximately 29Ksps.

Could anyone please explain why? I need two channel for my application with the speed at least 100Ksps. Any hint, please?
caokhoa
Posts: 7
Joined: Wed Aug 13, 2014 12:06 pm

Re: SAM4E16E DAC for 2 channel with PDC run only at 29Ksps

Tue Aug 26, 2014 5:34 pm

well, problem solved. I finally figure out the issue.

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