Some resources to help you getting started with STM32 programming.
MC34063 is a 1.2 A, Step-Up/Down/ Inverting Switching Regulators The MC34063 is a monolithic control circuit containing the primary functions required for DC−to−DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in StepDown and StepUp and Voltage−Inverting applications with a minimum number of external components.
Online Design Tool for MC34063A: http://www.nomad.ee/micros/mc34063a/