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Discussion Groups | TMS320C54x | DMA channel 0 interrupt on 5402
Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).
DMA channel 0 interrupt on 5402 - Eli - Sep 15 23:39:00 2001
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Hello All. A peculiar thing just happened to me (with a new DSK 5402). What I did, was to read McBSP0 with DMA using auto-initialize. The idea is to fill a buffer, and then go on to the next one. The interrupt routine is supposed to alter the global registers, so the data gets to a different buffer each time. I'm sure I didn't invent the wheel here. At first I used channel 0. The buffer was filled, but no interrupt occured. I wrote 0x40 to IMR, and got stuck on an "IDLE 1". No interrupt. (To the best documentation I have, bit #6 is DMAC0). Just to toy a bit, I moved to DMA channel 4, wrote 0x1000 to IMR, and suddenly it all works like a clockwork. (bit #12 is DMAC4). Honestly, all I did was to change the DMA channel and IMR. And I'm positive that the only change was a shift in the subaddresses to the DMA registers. I didn't mess with that. In fact, my problem is solved. But I still wonder: Does anyone have any idea of how this magic happened? Thanks, Eli |
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