Hello, I am working with a DV6446 EVM. I am attempting to perform an EDMA transfer inside of u-boot but am having trouble. I have been basing my code on the block move example on page 66 of document sprue23d.pdf. At this point when I initiate the transfer the processor restarts. My PaRAM block is configured as follows:
PaRAM->OPT = 0x00100008; PaRAM->SRC = src; PaRAM->A_B_CNT = 0x00133D48; PaRAM->DST = dest; PaRAM->SRC_DST_BIDX = 0x3D483D48; PaRAM->LINK_BCNTRLD = 0x0013FFFF; PaRAM->SRC_DST_CIDX = 0x3D483D48; PaRAM->CCNT = 0x00000002;
I am attempting to copy 0x918B0 bytes from src to dest. To do this I am trying to use an A-syncronized transfer with the A dimension as 0x3D48 bytes, the B dimension as 0x13 and the C dimension as 0x2. The sourceand destination indexes for B and C are both set to the size of the A-dimension, 0x3D48. B count reload is set to 0x13, the B dimension value I am using.
These parameters are set in PaRAM set zero. I am initiating the transfer by setting bit 0 of the ESR register. It seems as soon as I initiate the transfer this way the processor resets.
I have not used DMA in the past and am not sure what is going wrong. Any help is much appreciated.
Is there a code example of a DMA transfer available anywhere?
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.