Am335x uart+Edma with no uart timeout interrupt

user4187134

I'm working at using uart to receive data.

Code from starterware 02.00.01.01 uartecho_edma.

I enable the uart fifo with RX_DMA_THRESHOLD(1).so if there is one byte in fifo.it will be delivered by dma.i enable uart LINESTSIT and RHRIT interrupt.i enable uart dma function.i configure edma as A synchonize and acnt(1),bcnt(65535),ccnt(1).the code goes well but with a problem.there was no uart timeout interrupt.because every frame length may be variable. Timeout is very important to me.can anyone help me?

over 10 years ago

0 user4187134 over 10 years ago

Prodigy 30 points

I find with every dma transfer,the code goes into UARTIsr() but with no interrupt status.i cannot understand.

0 Biser Gatchev-XID over 10 years ago in reply to user4187134

TI__Guru**** 393215 points

Moving this to the Starterware forum.

0 Anant Pai over 10 years ago in reply to Biser Gatchev-XID

TI__Intellectual 1845 points

Hi user4187134,

The UART timeout interrupt is generated when the following condition exists

No Characters have been removed from or input to the receiver FIFO during the last four character times and there is at least one character in the receiver FIFO during this time.

Also please check the Line Status register to confirm whether any error bits of the character at the top of FIFO are set. If any error bit is set then the DMA event might not be triggered correctly.

Regards

Anant Pai

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Am335x uart+Edma with no uart timeout interrupt