I am wondering if there are any update on examples written on using the SD built in with DMA. This is for a data logging application.
From here: https://forum.pjrc.com/threads/43834-Real-low-latency-logging-for-Teensy-3-5-3-6-SDIO-SD
It seemed that it didn't work consistently with DMA before?
My digital converter is SPI based and a falling edge on a pin indicates data availability. I currently timestamp the microseconds in an interrupt on falling edge and pull the data by transferring a SPI instruction to read the data in the main loop. The data is 28 bit and I would like a sample rate of about 44kHz (which the converter can do).
Is logging data to the SD from a buffer with DMA the best solution for continuous sampling? Or do I read the data with SPI and DMA and write the data in the main loop (DMASPI library)?
Sorry, if this question has been repeated before but I can't seem to find a satisfying answer on the forum.
Thanks.
From here: https://forum.pjrc.com/threads/43834-Real-low-latency-logging-for-Teensy-3-5-3-6-SDIO-SD
It seemed that it didn't work consistently with DMA before?
My digital converter is SPI based and a falling edge on a pin indicates data availability. I currently timestamp the microseconds in an interrupt on falling edge and pull the data by transferring a SPI instruction to read the data in the main loop. The data is 28 bit and I would like a sample rate of about 44kHz (which the converter can do).
Is logging data to the SD from a buffer with DMA the best solution for continuous sampling? Or do I read the data with SPI and DMA and write the data in the main loop (DMASPI library)?
Sorry, if this question has been repeated before but I can't seem to find a satisfying answer on the forum.
Thanks.
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