nrf: fixups for changes from 2.2

1. bidirectional SPI support (@microbuilder please check)
2. slight changes in DigitalIO types
3. placeholders (not implemented yet) for single/double-click bootloader support

ports/nrf/Makefile

@@ -215,6 +215,7 @@ SRC_BINDINGS_ENUMS = \
 	digitalio/Direction.c \
 	digitalio/DriveMode.c \
 	digitalio/Pull.c \
+	microcontroller/RunMode.c \
 	help.c \
 	math/__init__.c \
 	supervisor/__init__.c \

ports/nrf/common-hal/busio/SPI.c

@@ -160,3 +160,27 @@ bool common_hal_busio_spi_read(busio_spi_obj_t *self, uint8_t *data, size_t len,
 
   return true;
 }
+
+bool common_hal_busio_spi_transfer(busio_spi_obj_t *self, uint8_t *data_out, uint8_t *data_in, size_t len) {
+  if (len == 0) {
+    return true;
+  }
+
+  while (len)
+  {
+    self->spi->TXD = *data_out;
+
+    while(!self->spi->EVENTS_READY);
+
+    *data_in = self->spi->RXD;
+
+    data_out++;
+    data_in++;
+    len--;
+
+    self->spi->EVENTS_READY = 0x0UL;
+  }
+
+  return true;
+}
+  

ports/nrf/common-hal/digitalio/DigitalInOut.c

@@ -55,7 +55,7 @@ void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t* self
 }
 
 void common_hal_digitalio_digitalinout_switch_to_input(
-        digitalio_digitalinout_obj_t* self, enum digitalio_pull_t pull) {
+        digitalio_digitalinout_obj_t* self, digitalio_pull_t pull) {
     self->output = false;
 
     hal_gpio_cfg_pin(self->pin->port, self->pin->pin, HAL_GPIO_MODE_INPUT, HAL_GPIO_PULL_DISABLED);
@@ -64,7 +64,7 @@ void common_hal_digitalio_digitalinout_switch_to_input(
 
 void common_hal_digitalio_digitalinout_switch_to_output(
         digitalio_digitalinout_obj_t* self, bool value,
-        enum digitalio_drive_mode_t drive_mode) {
+        digitalio_drive_mode_t drive_mode) {
     const uint8_t pin = self->pin->pin;
 
     self->output = true;
@@ -74,7 +74,7 @@ void common_hal_digitalio_digitalinout_switch_to_output(
     common_hal_digitalio_digitalinout_set_value(self, value);
 }
 
-enum digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
+digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
         digitalio_digitalinout_obj_t* self) {
     return self->output? DIRECTION_OUTPUT : DIRECTION_INPUT;
 }
@@ -110,7 +110,7 @@ bool common_hal_digitalio_digitalinout_get_value(
 
 void common_hal_digitalio_digitalinout_set_drive_mode(
         digitalio_digitalinout_obj_t* self,
-        enum digitalio_drive_mode_t drive_mode) {
+        digitalio_drive_mode_t drive_mode) {
     bool value = common_hal_digitalio_digitalinout_get_value(self);
     self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
     // True is implemented differently between modes so reset the value to make
@@ -120,7 +120,7 @@ void common_hal_digitalio_digitalinout_set_drive_mode(
     }
 }
 
-enum digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
+digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
         digitalio_digitalinout_obj_t* self) {
     if (self->open_drain) {
         return DRIVE_MODE_OPEN_DRAIN;
@@ -130,7 +130,7 @@ enum digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
 }
 
 void common_hal_digitalio_digitalinout_set_pull(
-        digitalio_digitalinout_obj_t* self, enum digitalio_pull_t pull) {
+        digitalio_digitalinout_obj_t* self, digitalio_pull_t pull) {
     hal_gpio_pull_t asf_pull = HAL_GPIO_PULL_DISABLED;
     switch (pull) {
         case PULL_UP:
@@ -146,7 +146,7 @@ void common_hal_digitalio_digitalinout_set_pull(
     hal_gpio_pull_set(self->pin->port, self->pin->pin, asf_pull);
 }
 
-enum digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
+digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
         digitalio_digitalinout_obj_t* self) {
     uint32_t pin = self->pin->pin;
     if (self->output) {

ports/nrf/common-hal/microcontroller/__init__.c

@@ -27,6 +27,8 @@
 #include "common-hal/microcontroller/Pin.h"
 #include "common-hal/microcontroller/Processor.h"
 
+
+#include "shared-bindings/microcontroller/__init__.h"
 #include "shared-bindings/microcontroller/Pin.h"
 #include "shared-bindings/microcontroller/Processor.h"
 
@@ -41,9 +43,17 @@ void common_hal_mcu_disable_interrupts() {
 void common_hal_mcu_enable_interrupts() {
 }
 
-// The singleton microcontroller.Processor object, returned by microcontroller.cpu
+void common_hal_mcu_on_next_reset(mcu_runmode_t runmode) {
+    // TODO: see atmel-samd for functionality
+}
+
+void common_hal_mcu_reset(void) {
+    // TODO: see atmel-samd for functionality
+}
+
+// The singleton microcontroller.Processor object, bound to microcontroller.cpu
 // It currently only has properties, and no state.
-mcu_processor_obj_t common_hal_mcu_processor_obj = {
+const mcu_processor_obj_t common_hal_mcu_processor_obj = {
     .base = {
         .type = &mcu_processor_type,
     },