configuration

[eunni]

Hi,

I now implementing i2c with 1 master (U575ZI-Q) and 3 slave (LK432KC).

I confirmed my code. It worked well.

but after changed title of the project and deleted some project, it made me confued,, 

so I made every(1master 3slave) project new.

 

Here is the problem.

I think I forgot some MX configuration...

When I debug master, slave didn't receive data.

 

1. I use 4.7kohm external pull up resistor, so I set GPIO pullup/pulldown mode as no pull up and no pull down both master and slaves.

2. of course I changed NVIC I2C event interrupt enabled both master and slaves.

3. pinout view is like this

well.. I think master configuration could be the problem... but I'm not sure

I'll attach my master and slave main.c file

 

Thank you :)

 

[AScha.3]

Hi,

set all pin speed to low , to avoid ringing at xx MHz .

+

>When I debug master, slave didn't receive data.

And without debug : its working fine ?

[eunni]

I think that's not critical reason for this error.. because It worked well before with very high output,,

Also, I checked the signal with logic analyzer without debug (just run), it still doesn't work..

 

Should I change GPIO pull up/pull down mode into "pull up" ?? 

now I set both master and slave "no pull up and no pull down" mode... 

is it correct??

[AScha.3]

I always set for I2C : pin speed : low ; pullups on .

+ For hi speed always need external pullups , but have internal on, is just some safety , if an external pullup has bad contact...run with low clock speed 100kHz or less, to test it.

Otherwise : if 4k7 pullups connected, internal on (40k) or off doesn't matter.