I2c timeout fix #232
Open
I2c timeout fix #232
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
I found an inconsistent behaviour of my code using I2C code.
The code for a I2C device with the STM32F401 worked fine with the full CPU speed, but when I slowed it down (changing the PLL settings in system.c accordingly), it started hanging on (and eventually timing out on line 48 of I2CMasterPollingFeature::readBytes() inside checkEvent(I2C_EVENT_MASTER_BYTE_RECEIVED). The behaviour was slightly different with "debug" and "fast" builds. It looked like it was a timing issue. During debugging I found, that after receiving the second last byte and after the "if (!count)" was entered, the checkEvent() never returned until the timeout kicked in.
This fix has been tested in all build configurations (debug, fast and small), with both, slow (8MHz) and full CPU speed on both STM32F401 and STM32F411 devices.