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Altera_Forum's avatar
Altera_Forum
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15 years ago

DMA transfer inside ISR: Problem

Hi everybody, I think this is a common issue, but I didn't find a solution to my question, so hopefully I will get an answer here: I have a DMA controller which I want to use on an IRQ com...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

You are using Altera's UART?

--- Quote Start ---

IOWR_ALTERA_AVALON_DMA_WADDRESS(DMA_BASE, SERIAL_UART_BASE+1); // TxData address is @ SERIAL_UART_BASE + 1(offset)

--- Quote End ---

I think this is not right. Register offset is 1, but the width is 32 bit. So next register address should be BASE + 4.

Try to use this: 

IOWR_ALTERA_AVALON_DMA_WADDRESS(DMA_BASE, IOADDR_ALTERA_AVALON_UART_TXDATA(SERIAL_UART_BASE));

Strange you see anything at all......

Regards