Assertion error in I2C interrupt (thread not suspended) Topic is solved

[lerela]

Hi,

I am running an STM32F417.

When I start an I2C3 transfer using i2cMasterTransmitTimeout(), I encounter the following assertion error (chthreads.c:571), called by the _i2c_wakeup_isr from the I2C interrupt "i2c_lld_serve_event_interrupt" (I2Cv1/i2c_lld.c:322):

Code: Select all

chDbgAssert(tp->p_state == CH_STATE_SUSPENDED, "not THD_STATE_SUSPENDED");

The thread ChibiOS is trying to wake up is indeed the one that called the i2c transfer function. I am wondering if it's possible that the I2C transfer started and ended before osalThreadSuspendTimeoutS() was even called, but if that's the case I don't understand why would I be the only person to encounter this error.

Any idea?

Thanks!

[Giovanni]

Hi,

It could also be a spurious interrupt when there is no thread waiting.

Very strange, moving this topic in "bug reports", you should explain how to reproduce the problem, that would make things easier.

Giovanni

[lerela]

There's no other task using I2C and this spurious interrupt comes after my call to the transmit function so I suspect this is the intended interrupt (especially since the rx buffer contains the data I am expecting), that's why I thought it might come from a misuse of the API.
If that does not ring a bell I'll dig deeper, I'll let you know what I find.

Thank you

[lerela]

Turned out to be an undetected stack overflow. Sorry about that.

[Giovanni]

Np, glad you fixed it.

Giovanni