Arduino for STM32

I am trying to communicate I2C between 2 STM32F103C8T6 but it does not work Master code: #include<Wire.h> int z[16]; void setup() { Serial.begin(9600); delay(50); Wire.begin(); delay(50); } void loop() { Wire1.requestFrom(0x09, 16); //to receive 16-byte; delay(50); Serial.print("Slave data: &qu...