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MSP430FR5969: An ADC12 and DMA question in lowpower mode
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. Can i just use DMA to achieve this goal instead of awaking CPU?
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:
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.)
An address (range) can be configured for both read and write in the Memory Protection Unit (MPU).
DMA memory operations don't occur simultaneously, nor do CPU memory operations -- DMA operations happen in priority order, and the CPU is stalled during DMA.
