stm32: Add board config option to enable/disable the ADC.

The new option is MICROPY_HW_ENABLE_ADC and is enabled by default.

ports/stm32/adc.c

@@ -35,6 +35,8 @@
 #include "genhdr/pins.h"
 #include "timer.h"
 
+#if MICROPY_HW_ENABLE_ADC
+
 /// \moduleref pyb
 /// \class ADC - analog to digital conversion: read analog values on a pin
 ///
@@ -683,3 +685,5 @@ const mp_obj_type_t pyb_adc_all_type = {
     .make_new = adc_all_make_new,
     .locals_dict = (mp_obj_dict_t*)&adc_all_locals_dict,
 };
+
+#endif // MICROPY_HW_ENABLE_ADC

ports/stm32/modpyb.c

@@ -218,8 +218,10 @@ STATIC const mp_rom_map_elem_t pyb_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_CAN), MP_ROM_PTR(&pyb_can_type) },
 #endif
 
+    #if MICROPY_HW_ENABLE_ADC
     { MP_ROM_QSTR(MP_QSTR_ADC), MP_ROM_PTR(&pyb_adc_type) },
     { MP_ROM_QSTR(MP_QSTR_ADCAll), MP_ROM_PTR(&pyb_adc_all_type) },
+    #endif
 
 #if MICROPY_HW_ENABLE_DAC
     { MP_ROM_QSTR(MP_QSTR_DAC), MP_ROM_PTR(&pyb_dac_type) },

ports/stm32/mpconfigboard_common.h

@@ -40,6 +40,11 @@
 #define MICROPY_HW_ENABLE_RNG (0)
 #endif
 
+// Whether to enable the ADC peripheral, exposed as pyb.ADC and pyb.ADCAll
+#ifndef MICROPY_HW_ENABLE_ADC
+#define MICROPY_HW_ENABLE_ADC (1)
+#endif
+
 // Whether to enable the DAC peripheral, exposed as pyb.DAC
 #ifndef MICROPY_HW_ENABLE_DAC
 #define MICROPY_HW_ENABLE_DAC (0)