Merge pull request #168 from PX4/i2c_workaround

I2C driver workaround for NuttX

nuttx/configs/px4fmu/nsh/defconfig

@@ -348,6 +348,16 @@ CONFIG_CAN_LOOPBACK=n
 CONFIG_CAN1_BAUD=700000
 CONFIG_CAN2_BAUD=700000
 
+
+# XXX remove after integration testing
+# 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
+
 #
 # I2C configuration
 #
@@ -357,14 +367,32 @@ CONFIG_I2C_TRANSFER=y
 CONFIG_I2C_TRACE=n
 CONFIG_I2C_RESET=y
 
+
+
+# XXX re-enable after integration testing
+
+#
+# I2C configuration
+#
+#CONFIG_I2C=y
+#CONFIG_I2C_POLLED=y
+#CONFIG_I2C_TRANSFER=y
+#CONFIG_I2C_TRACE=n
+#CONFIG_I2C_RESET=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_I2CTIMEOSEC=0
-CONFIG_STM32_I2CTIMEOMS=10
+#CONFIG_STM32_I2CTIMEOMS=10
+
+
+
+
+
 
 #
 # General build options