i2c & dma

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zmemw16
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i2c & dma

Postby zmemw16 » Fri Aug 28, 2015 1:50 pm

first i wonder if there's a need for it? in http://www.stm32duino.com/viewtopic.php?p=5138#p5138
mention is made of spi & the dma add-on and i thought what other libraries might be extended, first was i2c,
actually its the only one so far:-)

stephen

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RogerClark
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Re: i2c & dma

Postby RogerClark » Fri Aug 28, 2015 10:13 pm

You would need to look in the manual for the STM32, but I suspect in theory you could add DMA to Hardware I2C.

However one big caveat is, from what i recall, That Hardware I2C may have some issues even without trying to get DMA working.

also using DMA without using a completion callback would be fairly pointless as its a slow protocol so you wont gain much performance by using DMA.


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