This repo contains, the "Hardware" files to support STM32 based boards on Arduino version 1.5.x to the latest version (currently 1.6.3) including LeafLabs Maple, and Maple mini, and other generic STM32F103 boards
Please read the wiki https://github.com/rogerclarkmelbourne/Arduino_STM32/wiki for full details
Based on https://github.com/bobc/maple-asp, which is in turn based on LibMaple by Leaflabs
See also my blog
More information is available at http://www.rogerclark.net/stm32f103-and-maple-maple-mini-with-arduino-1-5-x-ide/