PIC32mx270f256b timing issues unresolved - [Solved]

[Zane]

Hi,

I have installed the latest version of FC and have noticed that delay macro works ok now . To get the UART to work correctly at a given baud rate the peripheral clock divisor needs to be set to /4. In doing this, having a timed interrupt that is also driven from the peripheral clock source, it will roll over at half the desired frequency.

To avoid having to use fiddle factors, should it be set so that with the peripheral clock divisor set to 1, a given baud rate selected will transmit at that rate and also the rollover frequency of the timed interrupt to occur at the rate set in the properties for the timed interrupt? I have not had time to test other functions such as CAN or PWM etc but would they be affected in the same manner?

Any help in getting this resolved would be hugely appreciated.

Thanks

[Benj]

Hi Zane,

Please can you try this updated CAL file to see if it fixes the baud problems with a peripheral divisor of 1.

The file needs to be placed into your "Flowcode 7/CAL/PIC32BIT" folder.

PIC32BIT_CAL_UART.c

(22.18 KiB) Downloaded 269 times

Let us know how you get on.

[Zane]

Hi Ben,

I have installed the updated CAL file and with the peripheral clock divisor set to 1 the UART transmits data at the correct rate .

To get the UART to work correctly at a given baud rate the peripheral clock divisor needs to be set to /4. In doing this, having a timed interrupt that is also driven from the peripheral clock source, it will roll over at half the desired frequency.

Now the timed interrupt will roll over at 2 x the desired frequency.

Thanks

[Benj]

Hi Zane,

Right I have changed the FCD now and hopefully the timer interrupt frequency should now be calculated correctly.

Simply copy the attached file into your "Flowcode 7/FCD/PIC32" folder and restart Flowcode for the changes to be loaded.

32MX270F256B.fcdx

(52.73 KiB) Downloaded 225 times

Let me know how you get on, if this works well for you then I'll roll it out to the other devices.

[Zane]

Hi Ben,

I have installed the FCDX file and it works . In the properties for the timer 1 interrupt the roll over frequency has changed from 150hz to 300hz.

Thanks