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Discussion Groups | TMS320C54x | Trouble with DMA
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).
Trouble with DMA - Jean Viljoen - Oct 9 9:43:00 2002
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Dear group I am using the C5402DSK and AIC10 EVM populated with 8 CODECS. I am using CCS 1.21 with XDS510PP JTAG emulator. To transfer data between CODECS and DSP an can use either DMA, or interrupts and then transmit over MCBSP. I find that when I use the DMA, I need to turn the power off to the DSK/EVM everytime I want to reload a new program, else it hangs in the init. code of the AIC EVM. This implies that I need to shut down CCS everytime before I can reload my program. This takes up vasts amounts of time during development. Does anyone have a pointer here? When I service the CODECS with interrupts and MCBSP, everything works fine. Jean Viljoen Development Engineer Azoteq (Pty) Ltd Tel: +27 21 863 0033 Fax: +27 21 863 1512 |
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Re: Trouble with DMA - Benjamin Chan - Oct 9 12:12:00 2002
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When you reset the DMA, you will need to wait for at least a FULL buffer time before you re-init the DMA control registers. This is to ensure the DMA sequence to settle down from previous operations. Try this sequence: RESET McBsp RESET DMA WAIT for DMA buffer time INIT McBsp INIT DMA The reason it works after you power cycle the board because the DMA is completly IDLE after power up. Ben --- Jean Viljoen <> wrote: > Dear group > > I am using the C5402DSK and AIC10 EVM populated with > 8 CODECS. I am using CCS 1.21 with XDS510PP JTAG > emulator. To transfer data between CODECS and DSP > an can use either DMA, or interrupts and then > transmit over MCBSP. > > I find that when I use the DMA, I need to turn the > power off to the DSK/EVM everytime I want to reload > a new program, else it hangs in the init. code of > the AIC EVM. This implies that I need to shut down > CCS everytime before I can reload my program. This > takes up vasts amounts of time during development. > Does anyone have a pointer here? When I service > the CODECS with interrupts and MCBSP, everything > works fine. > > Jean Viljoen > Development Engineer > > Azoteq (Pty) Ltd > Tel: +27 21 863 0033 > Fax: +27 21 863 1512 > > _____________________________________ __________________________________________________ |
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