tree c821d823b7aa4f9704aac7def12c1485f688cb2c
parent feb0086cca1724004b98682ea44a5c6403e46bcc
author Daniel Jarai <daniel.jarai@bartec-pixavi.com> 1531992943 +0200
committer Daniel Jarai <daniel.jarai@bartec-pixavi.com> 1544806575 +0100

nanohub: stm32: i2c: always wait for the BTF event in the DmaTxDone ISR

This interrupt is fired when the DMA transfer completes, ie. all bytes
have been transmitted to the I2C peripheral. However, It's possible that
the I2C transfer didn't finish yet, so before touching the peripheral,
wait for the BTF (byte transfer finished) flag to be set.

This fixes the issue where the last byte of a transfer was randomly lost,
especially at higher core clock frequencies (>= 40 MHz).

Change-Id: I126e43f1e9cfdc831f61d0a0a1940367440dce55