DMA MemoryToMemory using Timer for delivery rate?

[skeezix]

Posted on January 27, 2014 at 23:27

Given an F4 (F405 and F429) or even F2 ..

Is it possible for a DMA to be both MemoryToMemory and have the rate of delivery be set by a timer? ie: I'm effecting a copy from an array in RAM, to a GPIO. (a byte at a time, say, otherwise I could use SPI tricks.) With MemoryToPeripheral I think you can do it, but is M2M full speed only? Or is it possible to refer to a GPIO as a peripheral somehow? Thank you my friends, jeff #stm32f4-dma

[Tesla DeLorean]

Posted on June 12, 2014 at 03:03

I guess you might want to ponder MicroSD (SDHC/SDXC) cards, the interface is clockable in the 24-37 MHz region, and writing large blocks (32KB) via FatFs isn't particularly slow (I'd expect >10MBps)

For TIM8 the channels/streams are defined in the Reference Manual RM0 The specific pin designations for the channels can be found in the

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00037pdf

for the specific part. The lack of a proper ACK/REQ DMA interface is one of the missed opportunities in the STM32 designs.