Sleep mode with PPI triggered interface

[Pepam]

Hi,
in my app, I have to implement sleep between transmission running at 4Hz. On the background there is running adc, which data are collected via ppi, timer and SPI easy DMA at 50Hz. My question is how to implement sleep when timer used for triggering ppi generates events every 20ms. These timer events will wake up CPU every 20ms. Am I right? If yes, how to handle this situation? Thanks, Pepam

[Simonr]

Hi

I assume you want the device to sleep for longer than 20ms at a time here. The PPI is independent of the CPU, and will not wake up the CPU by default. This event, however, can be connected to a PPI channel and configured to generate an interrupt if you want it to wake the CPU. Please check out the Peripheral interface chapter in the product specification for reference. 

Best regards,

Simon