MSP430FR5969: An ADC12 and DMA question in lowpower mode

Runhua Wang 说：

Everyone, i wanna ask some questions. If the cpu works in lpm( low-power-mode), and i wanna use adc-12 to keep measuring a successive signal then store it into a flash outside the mpu.

The DMA can be used with the ADC, operating in the background with the CPU in LPM. here's an example for the F5 series, which has a similar ADC and DMA:

https://dev.ti.com/tirex/explore/node?node=ALkqBIa6R80LFOC7XAng.Q__IOGqZri__LATEST

For the ADC with DMA in LPM, here's a project that created before with FR5994 that you can take as a reference:

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/166/adc_5F00_dma_5F00_with_5F00_lea_5F00_4k.zip

Runhua Wang 说：

Can i just use DMA to achieve this goal instead of awaking CPU?

The FR5994 doesn't have an external bus (EMIF), so writing to an external flash would presumably use a serial port -- probably SPI. This can also be done with the DMA, but coordination with the ADC DMA would require some CPU intervention. (I don't know of a TI Example.)