Forgot to mention, I am using NucleoF446, master is I2C1, slave is using I2C3's pins PA8(SCL), PC9(SDA), I direct connect I2C1's SCL to PA8, I2C1's SDA to PC9.Tried with built in I2C3, I2C1 can talk to I2C3 each other, but when I try to implement sof...

Hi JW, thanks your excellent explaination.I used your suggestion, and copied part of void HAL_GPIO_Init(GPIO_TypeDef *GPIOx, GPIO_InitTypeDef *GPIO_Init), come up with a pin initialization function, but I can't get external interrupt, I tried by usi...

Hi I had similar situation, can you share the code on how you manage to make open drain and exti work together, thanks.