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| Search found 28 matches |
| Author | Message |
|---|---|
 Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
 Forum: General CCS C Discussion Posted: Wed Jul 26, 2023 10:41 am Subject: dsPIC30F internal FRC oscillator & PLL |
| All working fine now!
(rise time on the 'scope is well within spec) Just one gotcha I queried with CCS: if the oscillator is set in the header file i.e. #use delay(internal=60MHz) the compiler i ... |
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| Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
Forum: General CCS C Discussion Posted: Tue Jul 25, 2023 1:44 pm Subject: dsPIC30F internal FRC oscillator & PLL |
| Richard from CCS had some helpful info:
(I'll do some more investigation when I get a chance...) I reviewed what you have and it is correct to run the device at 60MHz, 15MIPS. From the testing I di ... |
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| Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
Forum: General CCS C Discussion Posted: Thu Jul 20, 2023 4:58 am Subject: dsPIC30F internal FRC oscillator & PLL |
| all power supply pins and decoupling look good.
PSU good. I don't think I can output CLKOUT. I'll just omit the 'fail safe clock monitor' and 'clock switching' fuse since I think it's really intend ... |
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| Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
Forum: General CCS C Discussion Posted: Wed Jul 19, 2023 9:33 am Subject: dsPIC30F internal FRC oscillator & PLL |
| can also use '#use delay(internal=120MHz)' if I omit '#FUSES CKSFSM'
fast serial comms works OK so now I'm doubtful of the CKSFSM. Is this one for CCS or do you have any other ideas? |
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| Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
Forum: General CCS C Discussion Posted: Wed Jul 19, 2023 9:03 am Subject: dsPIC30F internal FRC oscillator & PLL |
| I've now got an extra tant right next to the chip (it's powered by a TSR1-2433)
I have a 4-layer board with good power planes - so I think the hardware is good. If I include the #FUSES CKSFSM then t ... |
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| Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
Forum: General CCS C Discussion Posted: Wed Jul 19, 2023 7:48 am Subject: dsPIC30F internal FRC oscillator & PLL |
Thanks! thinking about it you must be correct. I'll check the PCB (bit more difficult with the customer's one  )
I had a play: If I ask for 30MHz the compiler gets 29922200Hz. which is PLL x ... |
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| Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
Forum: General CCS C Discussion Posted: Wed Jul 19, 2023 7:13 am Subject: dsPIC30F internal FRC oscillator & PLL |
| Thanks for the quick reply...
The datasheet says: 'The FRC oscillator is a fast (7.37 MHz ±2% nominal) internal RC oscillator' So I think I'm specifying it correctly - am I missing something obvio ... |
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| Topic: dsPIC30F internal FRC oscillator & PLL |
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| AlastairM Replies: 13 Views: 18703 |
Forum: General CCS C Discussion Posted: Wed Jul 19, 2023 6:39 am Subject: dsPIC30F internal FRC oscillator & PLL |
| Hi,
I'm using a dsPIC30F3012 which isn't letting me use the PLL! version 5.115 easiest program I could make: #include <30F3012.h> #device ICSP=1 //#use delay(internal=29.48MHz ... |
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| Topic: cheap RTD measurement |
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| AlastairM Replies: 4 Views: 6008 |
Forum: General CCS C Discussion Posted: Sun Jun 09, 2013 1:18 am Subject: cheap RTD measurement |
| Thanks,
I didn't spot the MAX31855 that's a great one chip solution. I'll get on with the PCB design ASAP! Al |
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| Topic: cheap RTD measurement |
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| AlastairM Replies: 4 Views: 6008 |
Forum: General CCS C Discussion Posted: Sat Jun 08, 2013 6:15 pm Subject: cheap RTD measurement |
| sorry, forgot to mention my temperatures are up to 300 degrees so I can't use the chip solution. | |
| Topic: cheap RTD measurement |
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| AlastairM Replies: 4 Views: 6008 |
Forum: General CCS C Discussion Posted: Sat Jun 08, 2013 5:28 pm Subject: cheap RTD measurement |
| Has anyone tried using the internal comparator on a 12F510 or similar for a relaxation oscillator to measure an RTD accurately or at least better than the 8-bit ADC that's available on these devices? ... | |
| Topic: dsPIC33 weak pull downs for info! |
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| AlastairM Replies: 5 Views: 5872 |
Forum: General CCS C Discussion Posted: Tue Apr 09, 2013 4:27 am Subject: dsPIC33 weak pull downs for info! |
| It all becomes clear at last!
I use MPLAB as my IDE and the help button on the menu bar doesn't launch the PCD help file when a PCD is the current device. I now know why I've been struggling! Do yo ... |
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| Topic: dsPIC33 weak pull downs for info! |
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| AlastairM Replies: 5 Views: 5872 |
Forum: General CCS C Discussion Posted: Tue Apr 09, 2013 3:36 am Subject: dsPIC33 weak pull downs for info! |
| oops! You are correct...
I tried my version and it worked for B5 and B6 (by a fluke!) I then tried to simulate it to look at the registers but the simulation crashed everytime. I should have looked ... |
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| Topic: dsPIC33 weak pull downs for info! |
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| AlastairM Replies: 5 Views: 5872 |
Forum: General CCS C Discussion Posted: Mon Apr 08, 2013 5:14 pm Subject: dsPIC33 weak pull downs for info! |
| (see later posts for correct usage of set_pulldown)
Hi. I'm using dsPIC33EP64MC504 / PCD 4.141 I eventually got weak pull downs working on an individual basis by set_pulldown(PIN_B6); t ... |
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| Topic: QEI on dsPIC33 |
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| AlastairM Replies: 11 Views: 23261 |
Forum: General CCS C Discussion Posted: Mon Apr 01, 2013 2:05 pm Subject: QEI on dsPIC33 |
| Have you looked in the file fuses.txt that CCS supply?....
Anyone else spotted that file - I haven't after 6 years! That format of description in each header file would be perfect. It's also reas ... |
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