LPC824 ADC with DMA example?

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by jdesbonnet on Mon Jun 15 09:07:09 MST 2015
I need to read from the LPC824 ADC at close to the maximum sample rate.  I'm using SCT0_OUT3 to trigger a sampling operation at regular intervals. My target rate is 480ksps (only one ADC channel needed). I'm currently using an ADC interrupt handler to copy the ADC data register into a SRAM buffer but I can't reach that sampling speed with that approach (ISR works at 240ksps, but at 320ksps it misses every second sample).

I guess ADC data direct to SRAM using a DMA channel would be ideal. But the setup seems rather complex, and I can't find any examples. Any pointers would be great.

Also any other suggestions for achieving the same thing? (I'm currently reading about ADC burst mode, but it's not clear if I can achieve regular sampling from SCT0_OUT3 with that approach).