IMX287 AUART DMA Receive

[zhendezhang]

Hello,Dear Support

   I am using IMX287 AUART for receive datas. I use DMA mode and set MXS_AUART_PORT_DMA_MODE on.

I set pdesc->cmd.cmd.bits.bytes = 23 forsed but the s->dma_rx_buffer_size is the PAGE_SIZE in function mxs_auart_submit_rx(struct mxs_auart_port *s).Then i send datas to Auart and in function mxs_auart_irq_dma_rx(int irq,void *context) i can receive 4 times which can also seen in function mxs_auart_rx_chars(struct mxs_auart_port *s) the variable count is 23. BUT the fifth i can't read any thing in function mxs_auart_submit_rx(struct mxs_auart_port *s).When i terminate my program i see Unhandled status 0x200400 which means receive fifo overrun INTR.

  I don't know what is the problem.

Do you have any idea? thank you very much.

[igorpadykov]

Hi zhende

to avoid data loss one can consider hardware flow control described on

Hardware flow (RTS/CTS) on AUARTs on i.MX28 not working. 

Best regards
igor
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