fix for mbed lib issue 1 (i2c problem) see also https://mbed.org/users/mbed_official/code/mbed/issues/1 affected implementations: LPC11U24, LPC1768, LPC2368, LPC4088

Fork of mbed-src by mbed official

Revision:
11:f9e72c209510
Parent:
9:0ce32e54c9a7