Prop Overclock and C

AORoche

I have an application that requires the free running counter run at 100Mhz (6.25Mhz XTAL). Is it possible to change the initialization of the clock ratio to have C functions run at the correct frequency (serial, pwm, etc.)?

SRLM

Yes, it is possible. The easiest way is to add "-D clkfreq=100000000" to the propeller-load command line.

jazzed

For SimpleIDE users ....

Assuming propeller-gcc install is in C:\Program Files (x86)\SimpleIDE\propeller-gcc (Windows) or /opt/parallax/ (Linux/Mac)

Save the code below to propeller-load folder as A100.cfg

C:\Program Files (x86)\SimpleIDE\propeller-gcc\propeller-load\A100.cfg
/opt/parallax/propeller-load/A100.cfg

Add A100.cfg to boards.txt (or simply rename boards.txt to boards2.txt to see all .cfg boards).
C:\Program Files (x86)\SimpleIDE\propeller-gcc\propeller-load\boards.txt
/opt/parallax/propeller-load/boards.txt

Restart SimpleIDE or just click the jigsaw puzzle piece in the Project Manager.

Then select A100 from board type.

# A100.cfg
    clkfreq: 100000000
    clkmode: XTAL1+PLL16X
    baudrate: 115200
    rxpin: 31
    txpin: 30

There is an alternative way of doing this in code using RCFAST board type, but I don't have the notes at the moment.