Embedded computing often needs to convert an analog signal level into a digital form for analysis. One application is measuring temperature by the voltage developed across a semiconductor. It is no surprise then that the STM32 platform has both an analog-to-digital converter (ADC) and a built-in channel to the ADC for measuring temperature.
This chapter’s demonstration project will illustrate how to use the libopencm3 routines to access the ADC peripheral, reading analog channels PA0 and PA1, in addition to reading the chip temperature and its internal reference voltage.
