Hello,
I have 2 piece stm32f407 board. i try to communicate them with I2C. One of them is master, other one slave. i tied 4.7k pull up resistors.
when i feed slave board with usb cablo (debug cablo),master generates "start" condition and slave answers.(i use leds to see that)
my connection is that ;
master and slave's gnd are common. slave 5V connect to master vdd.
But when i feed master with usb cablo(debug cablo) for debug, master cant generate "start " condition.
my connection is that ;
master and slave's gnd are common. slave vdd connect with master 5V.
What is the problem. Anyone has experienced that?
thanks in advance
This is when i feed slave one and it works. I see by leds.
