variants: WisMesh Tag: Enable DC/DC regulator

According to the documentation and experiments on other boards using
NRF52 + SX1262 this reduces the power consumption significantly. This
assumes that the hardware actually has the inductor for the internal
DC/DC regulator populated which is very likely. Even if not, it won't
hurt.

Signed-off-by: Frieder Schrempf <[email protected]>

Author: fschrempf

variants/rak_wismesh_tag/RAKWismeshTagBoard.cpp

@@ -21,6 +21,8 @@ static void disconnect_callback(uint16_t conn_handle, uint8_t reason) {
 void RAKWismeshTagBoard::begin() {
   // for future use, sub-classes SHOULD call this from their begin()
   startup_reason = BD_STARTUP_NORMAL;
+  NRF_POWER->DCDCEN = 1;
+
   pinMode(PIN_VBAT_READ, INPUT);
   pinMode(PIN_USER_BTN, INPUT_PULLUP);