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ZX-328n as a I2C Slave - Programming Failure

 
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everest



Joined: 31 May 2010
Posts: 96
Posted: 31 August 2010, 19:46 PM    Post subject: ZX-328n as a I2C Slave - Programming Failure Reply with quote
Don,

Are you aware of any reason why my ZX-328n would refuse to respond to an ATN signal while it's processing I2C requests from another processor? I have a situation where a ZX-24P processor issues I2C requests to a remote ZX-328n processor, and for whatever reason if my ZX-24p is actively running the ZX-328n becomes totally unresponsive to serial programming. Normal serial output is fine.

It's really strange. I have to flash a small "do nothing" program into my ZX-24p and presto, I can program my ZX-328n. Any ideas on why/how that might be happening?

-Jeff
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dkinzer
Site Admin


Joined: 03 Sep 2005
Posts: 2499
Location: Portland, OR
Posted: 01 September 2010, 16:11 PM    Post subject: Re: ZX-328n as a I2C Slave - Programming Failure Reply with quote
everest wrote:
Any ideas on why/how that might be happening?
Are you using the normal reset-based ATN or an ATN character?
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everest



Joined: 31 May 2010
Posts: 96
Posted: 05 September 2010, 16:28 PM    Post subject: Reply with quote
Don,

Currently we're using the reset (ATN) pin on the 328n. I've attached a schematic if it helps. The only difference is that I've had to remove (not hook up) C10. If C10 is in place, the microprocessor will not go into programming mode at all, regardless of the situation with the main processor.

-Jeff

Environment module.pdf
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