Another Prop board death, but not PLL
Chuck Rice
Posts: 210
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Just suffered another PropBoard Death. Thing is, it is not really dead. I have a program in the EEProm that reads GPS data, formats it and sends to a VGA monitor. That boots and runs fine. the GPS data update on the screen once a second. The problem is that it now will not accept a new program load. PropTool sees the port, but says that there is not a propeller there. If I unplug the Propeller Plug and plug it into another PropBoard, it works fine. I tried a second PropPlug with the same result. This board has been working fine for over a month now. I assume that it is not the PLL because the VGA works.
Any ideas what could cause it to blow like this? -Chuck-
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Post Edited (Chuck Rice) : 3/23/2008 6:33:30 PM GMT
Just suffered another PropBoard Death. Thing is, it is not really dead. I have a program in the EEProm that reads GPS data, formats it and sends to a VGA monitor. That boots and runs fine. the GPS data update on the screen once a second. The problem is that it now will not accept a new program load. PropTool sees the port, but says that there is not a propeller there. If I unplug the Propeller Plug and plug it into another PropBoard, it works fine. I tried a second PropPlug with the same result. This board has been working fine for over a month now. I assume that it is not the PLL because the VGA works.
Any ideas what could cause it to blow like this? -Chuck-
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Post Edited (Chuck Rice) : 3/23/2008 6:33:30 PM GMT
Comments
If the reset works, look for bad connections on the communication lines. One way to check for continuity is to short P30 and P31 with a 1K resistor. From the BASIC Stamp debug window, type in some characters. If they don't get echoed, you've either got a bad connection or your program is holding one of those pins in an output state. In that case, repeat the experiment with /RST pulled low. This will force the pins to an input state.
-Phil
Reset works because disconnect/reconnect of the USB cable reboots from EEProm. Will have to try the others though. Thanks. -Chuck-
As a last resort, you could always program the EEPROM using another board (leaving the power off that one, except to the eeprom chip).
What propboard are you using ? Can you give a schematic of your GPS to Prop connection
Regards,
John Twomey
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