EEPROM Variables (EE_Vars.pbp)

[Darrel Taylor]

Ross,

Try putting a pause 100 or so at the very beginning of your program.

The programmer goes through several cycles of power-on and resets to program each section of memory.
And the EEPROM write is one of the first things that happens in the program.

The EEPROM write takes ~5ms, so it's probably getting powered down in the middle of the write cycle.

With a pause at the beginning, it will insure that the programming cycles are completed before it starts running the rest of the program.

I've single stepped through the program several times in the simulator, and everything works fine.
I'm not in the office today, so I can't try it with a real programmer.

[RossWaddell]

Thanks Darrel! I'll try that tonight when I get home.

BTW, I've been using MCLR_OFF in my config but w/o a pull up resistor connected between the MCLR pin and +5v - should I have that resistor?

[Darrel Taylor]

With MCLR disabled, you don't need a pull-up, unless your input requires one for a switch or something.
And on the 16F1 (Enhanced Core) devices, you don't even need a pull-up when enabled. They have an internal pull-up on MCLR.

[RossWaddell]

Thanks again, Darrel! I remember now reading about the internal pull-up in the data sheet. This is what happens when you start a project and come back to it 6 months later

[RossWaddell]

Hmm. That seemed to work on a simpler project but when I add it to the one I attached above (and which I'm attaching here for you to see) it doesn't help the _MotorRPM problem (motors still spin up to their maximum speed, i.e. MotorRPM >= 255) but what is weird is that it now takes almost 6 seconds for them to start spinning!?!??! I only added a pause of 100.

Nacelle_Motors_16F1825_32Mhz_Int_SN754410.txt

[Darrel Taylor]

The internal oscillator runs at 500 Khz on power-up, which is 1/64th the 32 Mhz PBP is expecting.
So if you put it before the OSCCON statement, it will be equivelent to PAUSE 6400 or 6.4 seconds.

I'll try it on some real hardware tomorrow.

[RossWaddell]

That solved the 6 sec delay (by moving the 'pause 100' to after the OSCON statement) but it still spins up to max RPM ...

Nacelle_Motors_16F1825_32Mhz_Int_SN754410_Alt_Btn.txt