what is the difference between dowloading a program and reseting the chip?

[BrendanP]

I have a problem with a 28X1 program. When I first download the program in to the picaxe the program works perfectly. When I press the reset button the program malfunctions. (I have arest button on the pcb I designed). I resetting the picaxe would cause the program to run again fresh from the begining just like when you download a new program into the device.

What happens differently inside the picaxe when you download a program into the picaxe and when you reset the picaxe?

Update: It seems that even if I download a new program it doesnt run properly, but if I first of all clear hardware memory then download the program it then runs fine..... Im using the 28X1 with a GSM module, the picaxe learns and writes to eeprom the incomming calls number, it then replies to that number with a sms confirming that it learnt the number. Hithertoo I could just use the reset to start the program over again and then call it with a new phone and the device would learn that number which then gives that phone controll over the equipment.

 

[Texy]

I,m guessing here that your program, once run, is changing memory at some point and corrupting data or registers. You'll have to post your code.


Texy

 

[jmumby]

Whats your decoupling like? Does the program run ok with no gsm module?

 

[Technical]

Download clears the eeprom memory, reset doesn't.

If you want to clear the eeprom memory on a reset aswell you need to 'write' 0 to all the relevant bytes at the start of your program.