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Altera_Forum
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15 years ago

Changing DMA stread read to stream write

Hello, I have the following fully functional code that gives as output: Content of TX DDR2 SDRAM after DMA operation Address 0xC000000: 1 Address 0xC000004: 2 Address 0xC000008: 3 Address ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

In your first post, for read you set the transaction end correctly: 


alt_dma_rxchan_ioctl(rxchan, ALT_DMA_RX_ONLY_ON, rx_buffer);
alt_dma_rxchan_ioctl(rxchan, ALT_DMA_TX_ONLY_OFF, NULL);
For write, you don't: 


alt_dma_txchan_ioctl(txchan, ALT_DMA_TX_ONLY_OFF, NULL);
alt_dma_txchan_ioctl(txchan, ALT_DMA_RX_ONLY_OFF, NULL);

.....As I'm just having the same error, now I'm going to check whether I have the same mistake in my project. :D