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Discussion Groups | TMS320C55x | Idle domains on 5510
Technical discussions about the TI C55x DSPs (including the c5501, c5502, c5503, c5507, c5509, c5510 and OMAP5910).
Idle domains on 5510 - torgeirjakobsen - Feb 18 19:34:00 2002
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Hi I had problems with the idle domain a while ago, and I did not find out why they did not work. I am trying again now, and it works better than the first time I tried. The problem I have now is the DMA domain. I want to set all domains idle to reduce the power consumption to a minimum, but I have to set the DMA domain idle to be able to also set the CLKGEN domain idle. I do as follows: - Clear all interrupt flags (IFR0 and IFR1). - Enable external interrupt 0. This interrupt gives the wakeup from idle. - Enable maskable interrupts. - Set the ICR register ( to 0x003F to enable all idle domains). - Execute the IDLE instruction. - After wakeup by external int 0 the ICR is set to 0x0000. - Execute IDLE instruction again (to set everything active and not idle). Setting the ICR to 0x003F does not work. I have tried the following ICR settings to try to find the problem: - 0x0001 - Only CPU idle, works fine. - 0x0003 - CPU and DMA idle, does not work. - 0x0005 - CPU and CACHE idle, works fine. - 0x0009 - CPU and PERI idle, works fine. - 0x0021 - CPU and EMIF idle, works fine. - 0x002D - CPU,CACHE,PERI,EMIF idle, works fine. - 0x002F - CPU,DMA,CACHE,PERI,EMIF idle, does not work. - 0x003F - Everything idle, does not work. Any suggestions ? Best regards Torgeir Jakobsen |
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Re: Idle domains on 5510 - Torgeir Jakobsen - May 13 14:50:00 2002
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Hi I have still problems with the idle domains, as I described in my previous posting to this group. I have come a little bit further. The only idle domain which is not working now is the Clock generator idle. The DMA idle is working now. The problem was that the DSP is communicating with a host processor via the EHPI bus, and the host processor is not able to read the internal RAM if the DMA idle domain is active. Has anyone used the CLKGEN idle domain ? I have tried to set the ICR register to 0x003F (as described in my previous posting), but the DSP does not stop running the program. I have checked the BUS ERROR interrupt, but it looks like it is not waken up by this interrupt. It should not be waken up by this interrupt either since everything is set to idle at the same time. Best regards Torgeir Jakobsen Best regards Torgeir Jakobsen Senior Engineer, Technology Department Aanderaa Instruments AS e-mail: web: www.aanderaa.com phone; +47 55 10 99 00 direct: +47 55 10 99 77 fax: +47 55 10 99 10 ----- Original Message ----- From: "torgeirjakobsen" <> To: <> Sent: Monday, February 18, 2002 9:34 PM Subject: [c55x] Idle domains on 5510 > Hi > > I had problems with the idle domain a while ago, and I did not find > out why they did not work. I am trying again now, and it works better > than the first time I tried. The problem I have now is the DMA domain. > I want to set all domains idle to reduce the power consumption to a > minimum, but I have to set the DMA domain idle to be able to also set > the CLKGEN domain idle. > > I do as follows: > - Clear all interrupt flags (IFR0 and IFR1). > - Enable external interrupt 0. This interrupt gives the wakeup from > idle. > - Enable maskable interrupts. > - Set the ICR register ( to 0x003F to enable all idle domains). > - Execute the IDLE instruction. > - After wakeup by external int 0 the ICR is set to 0x0000. > - Execute IDLE instruction again (to set everything active and not > idle). > > Setting the ICR to 0x003F does not work. I have tried the following > ICR settings to try to find the problem: > - 0x0001 - Only CPU idle, works fine. > - 0x0003 - CPU and DMA idle, does not work. > - 0x0005 - CPU and CACHE idle, works fine. > - 0x0009 - CPU and PERI idle, works fine. > - 0x0021 - CPU and EMIF idle, works fine. > - 0x002D - CPU,CACHE,PERI,EMIF idle, works fine. > - 0x002F - CPU,DMA,CACHE,PERI,EMIF idle, does not work. > - 0x003F - Everything idle, does not work. > > Any suggestions ? > > Best regards > Torgeir Jakobsen > > > _____________________________________ > -- > This e-mail has been protected by Song Networks' virus-scan service: > http://www.securemail.no -- This e-mail has been protected by Song Networks' virus-scan service: http://www.securemail.no |
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