William San Filippo created MYNEWT-865:
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Summary: hal i2c lockup on nrf platform if timeout is too short
Key: MYNEWT-865
URL: https://issues.apache.org/jira/browse/MYNEWT-865
Project: Mynewt
Issue Type: Bug
Security Level: Public (Viewable by anyone)
Components: HAL
Affects Versions: v1_2_0_rel
Reporter: William San Filippo
Assignee: Marko Kiiskila
Fix For: v1_3_0_rel
The nordic TWI (i2c) interface locked up when a too short timeout was applied.
Not sure of all the details here but I believe another transaction was started
and that this transaction caused the TWI interface to become unresponsive.
The basic issue here is that the timeout is in os ticks and it is possible,
given the current code implementation, that there is basically no timeout
applied as a timeout of 1 os tick will give you a timeout of 0 to 1 os tick (in
msecs).
Another issue is that the code does not attempt to calculate whether the
timeout is too short given the length of i2c data to be sent, the clock
frequency and the time per os tick.
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