Hello,
I'm using an ADS1274 EVM along with a C6478 LCDK board. I'm not sure exactly what "Frame-Sync" mode is, so I decided to stick with what I know, which is SPI. After getting the unit up and running, I realized an issue I would have with the SPI format. I can deal with the lower data rate, but I'm having trouble dealing with the 24bit data.
I've set up EDMA3 transfers which are triggered by the NDRDY signal. The SPI can't read 24 bits at once, so I've set it up to make two 16 bit reads. With the resulting 32 bit SPI data, I get 24 bits from the ADC that are left justified and padded with zeroes to make 32 bits. This really screws up the negative numbers, so I tried shifting all of the data by 6, but doing that in a for loop leaves almost no time for further processing before the next buffer is ready.
So... I'm planning to migrating to the Frame-Sync format, but I'm not sure which hardware module to use. Can the McBSP or McASP modules be configured to do this?
