If you have the 3.2, try this: http://www.espruino.com/files/espruino_hystm32_32_vc_1v43_beta.zip
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
If you have the 3.2, try this: http://www.espruino.com/files/espruino_hystm32_32_vc_1v43_beta.zip