Implement initial ADC support

* Add simple ADC driver, with support for ADC1 and all channels.
* Export MicroPython ADC object with read_channel function.
* Add stm32f4xx_adc.c and adc.c to Makefile.

1 files changed, 1 insertions, 0 deletions

diff --git a/stm/adc.h b/stm/adc.h
new file mode 100644
index 000000000..5805aef42
--- /dev/null
+++ b/stm/adc.h
@@ -0,0 +1 @@
+mp_obj_t pyb_ADC(mp_obj_t resolution);