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DMA and memory cache don't always play nicely together. I had an issue when trying to use serial communication and DMA on a TI Hercules controller. The DMA data wasn't appearing in my read buffers. TI's application specialists helped me to resolve my issues. It was related to ARM memory cache settings. I've written a step-by-step guide on the hackster.io forum on that subject.     Due to the subject, this hasn't turned into an easy-to-read novel. I hope it may help fellow develop ...

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