Associate II

Question

Fetching Data with GPIOs

Posted on February 18, 2008 at 05:27

This topic has been closed for replies.

Associate II

Posted on May 17, 2011 at 12:23

Hi !

Did anybody check how fast data can be read in through the GPIO ports ?

I have to read in 256 unsigned short values and store them in internal

ram at a rate of 8MHz. Is this possible with the stm32 clocked with 72MHz.

Is this also possible with the DMA ?

regards

Manfred

Associate III

Posted on May 17, 2011 at 12:23

Hi all,

There is an interesting example in this application Note : ''AN2548'' Using the STM32F101xx and STM32F103xx DMA controller

: Section 4.3 : GPIO fast data transfer with DMA and also a source code is already provided :

, Hope this helps you , Cheers, STOne-32 ;)

Associate II

Posted on May 17, 2011 at 12:23

I would have thought it would be fine as it can output at upto 50MHz.

don't know about the dma though haven't played with that

Associate II

Posted on May 17, 2011 at 12:23

really good example !!

but how fast is the max external clock trigger in this example ?

the DMA need to be able to follow this and the program need to have a bit overhead also.

but 8MHz or even 20Mhz should be possible in 16 bits that is 40MBytes/sec peak.

I guess you will get problems at 30-40Mhz ?? or ??

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