m4: inital port

variants/thinknode_m4/ThinkNodeM4Board.cpp

@@ -0,0 +1,46 @@
+#include <Arduino.h>
+#include "ThinkNodeM4Board.h"
+#include <Wire.h>
+
+#include <bluefruit.h>
+
+void ThinkNodeM4Board::begin() {
+  NRF52Board::begin();
+  btn_prev_state = HIGH;
+
+  Wire.begin();
+  battery_serial->begin(4800);
+
+  delay(10);   // give sx1262 some time to power up
+}
+
+uint16_t ThinkNodeM4Board::getBattMilliVolts() {
+  int tentatives = 10;
+  uint8_t data[5];
+  uint8_t b;
+
+  if (battery_serial->available() < 10)
+    return bat_level_mv;
+
+  // discard old data
+  while (battery_serial->available() > 10)
+    battery_serial->read();
+
+  // synchronize
+  while((b = battery_serial->read()) != 0xFE) {
+    if (tentatives-- == 0) {
+      MESH_DEBUG_PRINTLN("Could not find battery frame start %x", b);
+      return bat_level_mv;
+    }
+  }
+  battery_serial->readBytes(data, 5);
+
+  if (data[4] != 0xFD) {
+    MESH_DEBUG_PRINTLN("Invalid battery frame end %x", data[4]);
+    return bat_level_mv;
+  }
+  bat_level_percent = data[0];
+  //MESH_DEBUG_PRINTLN("Battery level %d\%", bat_level_percent);
+  bat_level_mv = 2 * (data[1]*1000. + data[2]*10. + data[3]/10.);
+  return bat_level_mv;
+}