ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/testhal/STM32F1xx/I2C/i2c_pns.c

@@ -0,0 +1,47 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#include "ch.h"
+#include "hal.h"
+
+#include "i2c_pns.h"
+#include "lis3.h"
+
+
+/* I2C1 */
+static const I2CConfig i2cfg1 = {
+    OPMODE_I2C,
+    400000,
+    FAST_DUTY_CYCLE_2,
+};
+
+
+
+void I2CInit_pns(void){
+  i2cInit();
+
+  i2cStart(&I2CD1, &i2cfg1);
+
+  /* tune ports for I2C1*/
+  palSetPadMode(IOPORT2, 6, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
+  palSetPadMode(IOPORT2, 7, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
+
+  chThdSleepMilliseconds(100);  /* Just to be safe. */
+
+  init_lis3();                  /* accelerometer init */
+}
+
+