changes on leonardo usb midi monitor example for compilance on version 0.9.4

examples/LeonardoUsbSlaveMidiClockMonitor/LeonardoUsbSlaveMidiClockMonitor.ino

@@ -9,6 +9,12 @@
  * - USB-MIDI and MIDIUSB
  * - u8g2
  * - uClock
+ *
+ * This example make use of drift values (10, 14) 
+ * respectively for internal and external drift reference.
+ * This example was tested on a macbook 
+ * runing ableton live 9 as master clock
+ *
  * This example code is in the public domain.
  */
 
@@ -28,8 +34,8 @@ U8X8 * u8x8;
 #define MIDI_START 0xFA
 #define MIDI_STOP  0xFC
 
-char bpm_str[3];
+char bpm_str[4];
-uint16_t bpm = 126;
+float bpm = 126.0;
 uint8_t bpm_blink_timer = 1;
 uint8_t clock_state = 1;
 
@@ -91,7 +97,8 @@ void setup() {
   // OLED setup
   // Please check you oled model to correctly init him
   //
-  u8x8 = new U8X8_SH1106_128X64_NONAME_HW_I2C(U8X8_PIN_NONE);
+  //u8x8 = new U8X8_SH1106_128X64_NONAME_HW_I2C(U8X8_PIN_NONE);
+  u8x8 = new U8X8_SSD1306_128X64_NONAME_HW_I2C(U8X8_PIN_NONE);
   u8x8->begin();
   u8x8->setFont(u8x8_font_pressstart2p_r); 
   u8x8->clear();
@@ -101,7 +108,7 @@ void setup() {
   // uClock Setup
   //
   // fine tunning adjstments for you clock slaves/host setDrift(internal, external)
-  uClock.setDrift(10);
+  uClock.setDrift(10, 14);
   uClock.init();
   uClock.setClock96PPQNOutput(ClockOut96PPQN);
   // For MIDI Sync Start and Stop
@@ -110,6 +117,24 @@ void setup() {
   uClock.setMode(uClock.EXTERNAL_CLOCK);
 }
 
+void printBpm(float _bpm, uint8_t col, uint8_t line) {
+    int b = (int)_bpm;
+    //int c = (int)((_bpm-b)*100);
+    int c = (int)((_bpm-b)*10);
+    itoa(b, bpm_str, 10);
+    if (b > 99) {
+      u8x8->drawUTF8(col, line, bpm_str);
+    } else {
+      bpm_str[2] = "\0";
+      u8x8->drawUTF8(col, line, " ");
+      u8x8->drawUTF8(col+1, line, bpm_str);
+    }
+    u8x8->drawUTF8(col+3, line, ".");
+    itoa(c, bpm_str, 10);
+    u8x8->drawUTF8(col+4, line, bpm_str);
+    u8x8->drawUTF8(col+5, line, "bpm"); 
+}
+
 void loop() {
   MIDI.read();
   // DO NOT ADD MORE PROCESS HERE AT THE COST OF LOSING CLOCK SYNC
@@ -117,9 +142,7 @@ void loop() {
   // read Serial as fast as we can on the loop
   if (bpm != uClock.getTempo()) {
     bpm = uClock.getTempo();
-    itoa(bpm, bpm_str, 10);
+    printBpm(bpm, 8, 7);
-    u8x8->drawUTF8(10, 7, bpm_str);
-    u8x8->drawUTF8(13, 7, "bpm"); 
   }
   if (clock_state != uClock.state) { 
     clock_state = uClock.state;