Prop doesn't do his work

propwell

Hi folks, here's my new problem:

i've built a board with the Prop Q44 on it. I use the PropPlug to program it. I had many problems getting started, but finally i managed it to programm RAM and EEPROM.
But now i've got a new problem: after programming, my Prop doesn't do anythin, just like he's dead. The same program on the Propeller-Demo-Board works!
I tried a programm which just sends some data via the SerialMirror.spin.
I can't imagine what the error could be! I'm using a 5MHz Crystal, is there anythin that could be wrong?

Thank you,
Max

Philldapill

Can you REprogram the Propeller RAM or EEPROM?

It could always be the heinous PLL Failure... That seems to be the most common type of failure with what you are describing - especially if you can reprogram it, but it does nothing.

QuattroRS4

Propwell said...
Prop doesn't do his work

The prop is male ?

Regards,
John

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Mike Green

To test for the "dreaded PLL failure" problem, use some kind of program that doesn't require accurate timing (no serial I/O) and specify the RCFAST clock instead of XTAL1 + PLL16X. If that works, you have damaged part of the Propeller chip. Usually this is due to inadequate power distribution. The Propeller has several Vdd / Vss power pins. If there's not adequate power distribution around the chip, too much current can flow between the Vdd and/or Vss pins and the resulting voltage differentials across the chip can damage part of the PLL module.

None of the PLL clock modes will work, but the Propeller can download and run any program that uses XINPUT, RCSLOW, or RCFAST clock modes. You won't be able to use the crystal, but you can use an external crystal oscillator.

RiJoRi

Mike Green wrote:
[noparse][[/noparse]quote]The Propeller has several Vdd / Vss power pins. If there's not adequate power distribution around the chip, too much current can flow between the Vdd and/or Vss pins and the resulting voltage differentials across the chip can damage part of the [noparse][[/noparse]circuitry].

A-hah! And I thought they were there because the designers were embarrassed by multiple "N/C" (Not Connected) pin markings! Live-'n'-learn!

--Rich