libmaple is bundled with the Maple IDE. However, we develop it separately, and release it standalone for advanced users who might chafe at the “sketch” programming model of the IDE.Indeed I am one of those who "chafe" at sketch programming and the whole Arduino style of doing things.
More important with regard to my current frustration with getting an i2c driver to work are these comments:
There are some important known problems with the built-in I2C peripherals. For more information, see STM32F10xx8 and STM32F10xxB Errata sheet (ST Doc ID 14574 Rev 8), Section 2.11.1, 2.11.2. An important consequence of these problems is that the I2C interrupt must not be preempted. Consequently, (by default) Wirish uses an I2C interrupt priority which is the highest in the system (priority level 0). Other interrupt priorities are set lower.
Tom's Computer Info / tom@mmto.org