STM32 I2C interupt not being pended

[HoangHung]

I am trying to write my own I2C driver but I have been having an issue that after sending the start condition both SCL and SDA lines go low and stay that way. After some painful debugging I realize that the I2C event interrupt handler is not being called, which I rely upon to write to the data register.

I tried to set pending the interrupt manually and the handler was invoked and a byte got send through, so I know that for some reason the hardware is just not pending it. I don't know why that is. Can anyone help?

[waclawek.jan]

Read out and check/post the I2C registers content.

A generic "interrupt does not fire" checklist here.

JW

[HoangHung]

Thank you for the reply. These are the values of the i2c registers.

I2C2_CR1       0x00000401 = PE | ACK

I2C2_CR2       0x00000324 = ITERREN | ITEVTEN | FREQ (=36)
I2C2_OAR1    0x00000000
I2C2_OAR2    0x00000000
I2C2_SR1       0x00000001 = SB
I2C2_SR2       0x00000003 = MSL | BUSY
I2C2_CCR      0x000000B4 = CCR (=180)
I2C2_TRISE   0x00000025

The checklist did not add much.

 

[waclawek.jan]

As both SB and ITEVTEN are set, and you're confident there's nothing else from the checklist which would prevent the interrupt to run, I am out of ideas, sorry.

JW

PS. You are aware of the fact that many 'F103 these days are counterfeit, aren't you.