| View previous topic :: View next topic |
| Author |
Message |
dragonerd1
Joined: 22 Feb 2017
Posts: 1
|
| PSMC configuration |
 Posted: Wed Feb 22, 2017 1:03 pm |
 |
|
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));
|
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? |
|
 |
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Wed Feb 22, 2017 2:59 pm |
|
|
| dragonerd1 wrote: |
But the system still behaves as if it were configured at 32Mhz. |
And what is that behavior ? |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19549
|
|
| Posted: Wed Feb 22, 2017 3:36 pm |
|
|
| and what chip/compiler version?. |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9245
Location: Greensville,Ontario
|
|
| Posted: Wed Feb 22, 2017 3:42 pm |
|
|
| Also...does a 1Hz LED program run correctly ? |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19549
|
|
| Posted: Thu Feb 23, 2017 3:10 am |
|
|
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))
|
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. |
|
|
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
