i.MX Processors中的主题 Using dma in uart driver

Using dma in uart driver

arisav — Wed, 21 Sep 2016 07:09:57 GMT

We are using cyclic dma in our uart driver (modified imx-uart.c) and ocassionally there seems to have data loss in receive side. Is it possible to use dma without RTS/CTS handshaking?

Common transfer characteristics are:

kernel version:3.14.28
Baud Rate: 1000000
Handshaking:None
Using Cyclic DMA

Best Regards

Ari

Re: Using dma in uart driver

Yuri — Wed, 21 Sep 2016 07:20:18 GMT

Hello,

To avoid data lost RTS / CTS handshaking must be used.

Have a great day,

Yuri

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