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dragonerd1
Joined: 22 Feb 2017
Posts: 1
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| PSMC configuration |
 Posted: Wed Feb 22, 2017 1:03 pm |
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I use PSMC for frequency variation. I use 32Mhz clock (8Mhx*4PLL).
| Code: |
setup_psmc(1, PSMC_VARIABLE_FREQ, PSMC_EVENT_TIME | PSMC_SOURCE_FOSC | PSMC_DIV_8, us(usPeriodo), PSMC_EVENT_TIME, us(100), PSMC_EVENT_TIME, us(350));
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In this line I configure PSMC_SOURCE_FOSC, I think it's 32Mhz. If I use PSMC_DIV_8, the frequency is 4Mhz. But the system still behaves as if it were configured at 32Mhz.
Why?
The code is not right? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Feb 22, 2017 2:59 pm |
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| dragonerd1 wrote: |
But the system still behaves as if it were configured at 32Mhz. |
And what is that behavior ? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19983
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| Posted: Wed Feb 22, 2017 3:36 pm |
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| and what chip/compiler version?. |
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temtronic
Joined: 01 Jul 2010
Posts: 9595
Location: Greensville,Ontario
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| Posted: Wed Feb 22, 2017 3:42 pm |
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| Also...does a 1Hz LED program run correctly ? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19983
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| Posted: Thu Feb 23, 2017 3:10 am |
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You do realise that if you change the clock being used, you have to change the clock figure in the us define, to get it to do the calculations correctly?.
| Code: |
#define us(time) (int16)(time*(getenv("CLOCK")/1000000))
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This is assuming that the psmc is fed with the 'clock' (FOSC). To make these calculations work right if using FOSC/8, you have to change this define to match the clock being used. |
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