AT+CFUN=1 unexpected reaction on ver 3.5 of FW

[daniil]

Posted on July 27, 2016 at 06:31

Hello!

I have some troubles with wifi module.

At first I have upgraded a firmware of my SPWF01SA.11

from ver 3.3 (default) to ver 3.5

following instructions.

And since this moment I found unexpected reaction of module for ''AT+CFUN'' command.

Now, If I send from console ''AT+CFUN=1'' module gets RESTART event and puts to the console:  ''+WIND:2:Reset'' and ... NOMORE! No reaction for any console command while hardware reset button not being pressed.

I think, the module is not responding.

And now I cannot reset the module from console (by host MCU software), only by hardware button on pcb.

How can I eliminate this trouble?

Best regards, Daniel.

#bug #spwf01sa

[daniil]

Posted on August 02, 2016 at 06:58

Good morning!

I've fixed the problem.

The radix of problem was in my custom board circuit.

I connected reset pin of module to external MCU and to reset button with pullup resistor and bypass capacitor 0.1uF.

But It is the wrong way when external MCU pin is open-drain output in high state.

I've investigated then the module reset pin pulled down when SW reset has occurred.

STM MCU pulls it down internally in the module.

And external MCU pin disturbs to fall reset pin into zero because there is voltage divider which handles about 2.8V on reset pin when SW reset occured.

I've tried to reconfigure external pin to Hi-Z input state and the module became to work

correctly with AT+CFUN=1 command.

Best regards,

Daniel