nrf/modules/nrf: Add function to enable/disable DCDC.

This function can be used to enable and disable the DC/DC converter with or
without the Bluetooth stack enabled.  It can also be used to query the
current state of the DC/DC.

This commit also adds a definition of ARRAY_SIZE needed by nrfx HAL-layer.

ports/nrf/modules/nrf/modnrf.c

@@ -29,15 +29,40 @@
 
 #if MICROPY_PY_NRF
 
-#if MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE
 #include "flashbdev.h"
 #include "flash.h"
+#include "nrf_power.h"
+
+#if BLUETOOTH_SD
+#include "nrf_soc.h"
+#include "ble_drv.h"
+#define BLUETOOTH_STACK_ENABLED() (ble_drv_stack_enabled())
+#endif
 
 #define FLASH_PAGE_ALIGN_UP(addr)   (((addr) - 1) + (FLASH_PAGESIZE)-(((addr) - 1) % (FLASH_PAGESIZE)))
 
 extern uint32_t _unused_flash_start;
 extern uint32_t _unused_flash_len;
 
+#if NRF_POWER_HAS_DCDCEN
+STATIC mp_obj_t dcdc(size_t n_args, const mp_obj_t *args) {
+    if (n_args > 0) {
+        bool dcdc_state = mp_obj_is_true(args[0]);
+        #if BLUETOOTH_SD
+        if (BLUETOOTH_STACK_ENABLED()) {
+            sd_power_dcdc_mode_set(dcdc_state);
+        } else
+        #endif
+        {
+            nrf_power_dcdcen_set(NRF_POWER, dcdc_state);
+        }
+    }
+    return mp_obj_new_bool(nrf_power_dcdcen_get(NRF_POWER));
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dcdc_obj, 0, 1, dcdc);
+#endif
+
+#if MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE
 mp_obj_t nrf_modnrf_freeflash_start_aligned(void) {
     return mp_obj_new_int_from_uint(FLASH_PAGE_ALIGN_UP((uint32_t)&_unused_flash_start));
 }
@@ -54,6 +79,9 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_0(nrf_modnrf_freeflash_length_aligned_obj, nrf_mo
 
 STATIC const mp_rom_map_elem_t nrf_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_nrf) },
+    #if NRF_POWER_HAS_DCDCEN
+    { MP_ROM_QSTR(MP_QSTR_dcdc), MP_ROM_PTR(&dcdc_obj) },
+    #endif
     #if MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE
     { MP_ROM_QSTR(MP_QSTR_Flash), MP_ROM_PTR(&nrf_flashbdev_type) },
     { MP_ROM_QSTR(MP_QSTR_unused_flash_start), MP_ROM_PTR(&nrf_modnrf_freeflash_start_aligned_obj) },

ports/nrf/nrfx_glue.h

@@ -27,8 +27,15 @@
 #ifndef NRFX_GLUE_H
 #define NRFX_GLUE_H
 
+#include "py/mpconfig.h"
+#include "py/misc.h"
+
 #include <soc/nrfx_irqs.h>
 
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE MP_ARRAY_SIZE
+#endif
+
 #define NRFX_STATIC_ASSERT(expression)
 
 #define NRFX_ASSERT(expression)  do { bool res = expression; (void)res; } while (0)