ChibiOS Free Embedded RTOS

Ok just a little update: Error is still there, but occurs only on SDA line glitches. SCL is error prone.

To reproduce error:
1) Perform continuous communication with I2C slave in loop.
2) Toggle SDA line to ground externally.
3) In around 10% cases the MCU gets stuck in I2C1_EV_IRQHandler ...

I missed this:
@dandys, I believe that __attribute__ is a GCC-specific extension.

Agree. But there can be some similar extensions for other compilers too (as is for packed structures for example). In this case some macros like KEEP_SYMBOL_BEGIN and KEEP_SYMBOL_END can be defined in chtypes.h. Are ...

I missed this:
@dandys, I believe that __attribute__ is a GCC-specific extension.

Agree. But there can be some similar extensions for other compilers too (as is for packed structures for example). In this case some macros like KEEP_SYMBOL_BEGIN and KEEP_SYMBOL_END can be defined in chtypes.h. Are ...

Hi mabl,

maybe gcc __attribute__ ((used)) can also work for you to preserve structure. But don't know if any other commercial compilers has some similar option, so not sure about portability. Another solution would be put structure in dedicated section and use KEEP keyword for this input section in ...

SOLVED: it was just I2C IRQ priority problem. Increased priority and no errors now. Big thanks to barthess for patience. He helped me on IRC channel much.

@ barthess
Unfortunately still returning error. CH_DBG_ENABLE_ASSERTS was already disabled and I've tried attached driver . Error rate seems to be unchanged Also tried remove Invensense MPU6050 code, but error still happening while reading out LSM303DLHC magnetometer.

Hi barthess, I have the similar behavior on my board. I2CD_ACK_FAILURE error occurs once per approximately 1400 I2C transactions, no matter what device I actually reading- I have MPU6050, LSM303DLHC and MS5611 on the bus. Early I thougt it's electrical problem, but i can see nice edges on ...