Propeller trouble

Lafet

In Propeller Tool:

F7 - Identify Hardware - "Propeller chip version 1 found on COM 6."
F10 - Load RAM - "Propeller chip lost on COM 6."

Where's error? I can't upload programme to the chip.

Thanks, Lafet

Clemens

Are you running the propeller on battery? I had the message once when my battery was low.

bot-man

I ran into this last night. Two things to check, 1 - make sure you do not
have something connecting to pins 28-31. (These are used for I2C
EEPROM and serial download.) 2 - Make sure nothing is touching the
XTAL pins.

I was holding the Propeller demo board in my hand and must have been
making contact with the crystal in one case. In the other case I had
a buffer chip which was putting some minor loading on one or more
of pins 28-31.

Good Luck,
Bot-Man

Lafet

But

F7 - Identify Hardware - OK
F10 - Load RAM - ? Error

Why on F7 chip responds and on F10 no? If be at fault crystal, so would not function F7.

EEPROM I haven't connected.

Rayman

Are you using USB or regular serial connection?

Basil

Hi Lafet,

I found that happened to me if the prop terminal connected to the prop first (as yours does), but another program tried to write to COM6 soon after.
It interfered with the comms or something.

It found the prop ok and connected, but the lost the prop.

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-Alec

My our page

Basil

Sorry forgot to ask, are you using your own board or one of parallax's?

This happens when programming the EEPROM if the EEPROM pins are shorted, perhaps if the prop's 2 i2c pins are shorted you get the same issue?

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-Alec

My our page

Lee Marshall

If you are using your own board(like me), make sure there is enough capacitance between the 3.3v and the 0v rail.
I use a 220uF electrolytic, its more than enough. If you have an oscilloscope, monitor the 3.3v for noise. this is most likely if you are using a max3232 to convert RS232 voltage, as i recall, they create huge oscillations that are enough to completely disrupt the prop.

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Holy parallel processing, Batman!

Post Edited (Mr Crowley) : 10/5/2007 12:30:33 AM GMT

deSilva

F7 o.k. shows that ALL comm works (SND, RCV, RESET)
F10 does not even touch the EEPROM lines

"Lost connection" generally indicates the Prop has reset inbetween.
Reasons for that can be:
- Problems with the "reset logic" of a customer circuit
- Power problems.

Though Parallax does not seem to strictly recommend this, it is very good practice for more than 30 years now to add a 100nF ceramic close to any chip... (Between plus and minus, before you ask..)
A large electrolyte will do no harm, but will not always help...

Lafet

Thanks everyone,

Circuit on solderless connecting boards
Between PC and Propeller is USB Prop Clip.
Worked it so already for a longer time, but from yesterday works wrong.

Lafet

deSilva

So exchange the chip, which is no task on the breadboard. And don't say you have no second Prop... The basic rule for any serious electronic hobbyist is to have EVERYTHING at leat twice

Fred Hawkins

deSilva, you are starting to sound like my father after my seven-year-old self lost his shovel (which was bigger than me) -- "Show me a man with kids and I'll show you someone who has bought everything and has nothing".

Amusements aside, when I first ran a battery down to the point of Prop-Don't-Work-Anymore I realized that, as nifty as the PEKit was, if I didn't have a spare, the failure of just about any part would stop me in my tracks. So I bought another PEKit. And have about 4 spare batteries too.