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HOTFIX: disable interrupt-driven I2C mode, configure pessimistic I2C timeout, correct handling of the NAK generation for I2C master reads.

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This looks like it addresses the recent I2C lockup issue, unfortunately it also increases CPU consumption by ~5% for the I2C sensor bus.
This commit is contained in:
px4dev
2013-01-18 00:43:57 -08:00
parent 7d7c352fb4
commit bc35bb23dd
4 changed files with 56 additions and 12 deletions
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nuttx/configs/px4fmu/nsh/defconfig
+10 -8
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@@ -352,17 +352,19 @@ CONFIG_CAN2_BAUD=700000
# I2C configuration
#
CONFIG_I2C=y
#CONFIG_I2C_POLLED=y
CONFIG_I2C_POLLED=y
CONFIG_I2C_TRANSFER=y
CONFIG_I2C_TRACE=n
CONFIG_I2C_RESET=y
# Allow 180 us per byte, a wide margin for the 400 KHz clock we're using
# e.g. 9.6 ms for an EEPROM page write, 0.9 ms for a MAG update
CONFIG_STM32_I2CTIMEOUS_PER_BYTE=200
# Constant overhead for generating I2C start / stop conditions
CONFIG_STM32_I2CTIMEOUS_START_STOP=700
# XXX this is bad and we want it gone
CONFIG_I2C_WRITEREAD=y
# Dynamic timeout
#CONFIG_STM32_I2C_DYNTIMEO=y
#CONFIG_STM32_I2C_DYNTIMEO_STARTSTOP=500
#CONFIG_STM32_I2C_DYNTIMEO_USECPERBYTE=200
# Fixed per-transaction timeout
CONFIG_STM32_I2CTIMEOSEC=0
CONFIG_STM32_I2CTIMEOMS=10
#
# General build options