Example/test code for the mda300ca access functions.

vm.vmsf is the VM description file

pintrigger.mt: send a UART message, toggle led when pin changes
readpin.mt: send UART message with pin 2's value
writepin.mt: toggle pin 2 once a second
readsht.mt: send UART message with temperature, humidity
sample.mt: turn 2.5V on, read A/D channel 4
