display control

master/global.h

@@ -0,0 +1,9 @@
+#define DATA_STOP_BYTE 0x00
+#define DATA_INIT_BYTE_1 0x01
+#define DATA_INIT_BYTE_2 0x02
+#define DATA_RESET_BYTE 0xFF
+#define TRIGGER_BIT_1 1
+#define HIGH_BIT_1 2
+#define TRIGGER_BIT_2 4
+#define HIGH_BIT_2 8
+#define I2C_ADDRESS_START 0x08

master/master.ino

@@ -1,38 +1,39 @@
 #include <Wire.h>
 #include <ArduinoMqttClient.h>
 #include <Ethernet.h>
+
 #include "config.h"
+#include "global.h"
 
 #define READ_BYTES_FROM_WIRE 1
 
-// needs global define
-#define DATA_STOP_BYTE 0x00
-#define DATA_RESET_BYTE 0xFF
-#define HEADING_TRIGGER_BIT 1
-#define HEADING_HIGH_BIT 2
-#define ALTITUDE_TRIGGER_BIT 4
-#define ALTITUDE_HIGH_BIT 8
-
 #define HEADING_SIM_UP "sim/autopilot/heading_up"
 #define HEADING_SIM_DOWN "sim/autopilot/heading_down"
 #define ALTITUDE_SIM_UP "sim/autopilot/altitude_up"
 #define ALTITUDE_SIM_DOWN "sim/autopilot/altitude_down"
-#define AIRPSEED_SIM_UP "sim/autopilot/airspeed_up"
+#define AIRSPEED_SIM_UP "sim/autopilot/airspeed_up"
 #define AIRSPEED_SIM_DOWN "sim/autopilot/airspeed_down"
 
 #define MQTT_SIM_COMMAND_TOPIC "/xplane/meta/cmnd"
 #define MQTT_SIM_DEVICE_TOPIC "/xplane/meta/device"
+#define MQTT_SIM_LOG_TOPIC "/xplane/meta/log"
 #define MQTT_SIM_VALUE_TOPIC "/xplane/rref/#"
 
 #define MQTT_KEEPALIVE_INTERVAL_MS 15000
 
 struct device {
-  byte address;
+  byte address;       // I2C address of device
-  String name;
+  char *name;        // name of this device
+  char name1[3];      // first name to send on init of device
+  char *highCommand1; // command to use if TRIGGER_BIT_1 is set and HIGH_BIT_1 is set
+  char *lowCommand1;  // command to use if TRIGGER_BIT_1 is set and HIGH_BIT_1 is not set
+  char name2[3];      // second name to send on init of device
+  char *highCommand2; // command to use if TRIGGER_BIT_2 is set and HIGH_BIT_2 is set
+  char *lowCommand2;  // command to use if TRIGGER_BIT_2 is set and HIGH_BIT_2 is not set
 };
 
 struct device devices[] = {
-  {0x00, "althead"}
+  { 0x08, "Heading Speed", {'H', 'D', 'G'}, HEADING_SIM_UP, HEADING_SIM_DOWN, {'S', 'P', 'D'}, AIRSPEED_SIM_UP, AIRSPEED_SIM_DOWN }
 };
 
 int numDevices = -1;
@@ -65,12 +66,28 @@ void onMqttMessage(int messageSize) {
 //  Serial.println();
 }
 
-void sendMqttMessage(char *topic, char *message) {
+void sendMqttMessage(char *topic, int n, ...) {
   mqttClient.beginMessage(topic);
-  mqttClient.print(message);
+  va_list args;
+  va_start(args, n);
+  for (int i = 0; i < n; i++) {
+    mqttClient.print(va_arg(args, char*));
+  }
+  va_end(args);
   mqttClient.endMessage();
 }
 
+void sendI2CInit(struct device d) {
+  sendMqttMessage(MQTT_SIM_LOG_TOPIC, 2, "Sending init to ", d.name);
+  Wire.beginTransmission(d.address);
+  Wire.write(DATA_RESET_BYTE);
+  Wire.write(DATA_INIT_BYTE_1);
+  Wire.write(d.name1, 3);
+  Wire.write(DATA_INIT_BYTE_2);
+  Wire.write(d.name2, 3);
+  Wire.endTransmission(d.address);
+}
+
 void setup() {
   // count devices for loop
   numDevices = sizeof(devices) / sizeof(device);
@@ -96,7 +113,7 @@ void setup() {
     while (1);
   } else {
     Serial.println("MQTT connected");
-    sendMqttMessage(MQTT_SIM_DEVICE_TOPIC, "Master online");
+    sendMqttMessage(MQTT_SIM_DEVICE_TOPIC, 1, "Master online");
   }
 
   // subscribe to MQTT topic
@@ -115,9 +132,7 @@ void setup() {
 
   // initialize devices
   for (int i = 0; i < numDevices; i++) {
-    Wire.beginTransmission(devices[i].address);
+    sendI2CInit(devices[i]);
-    Wire.write(DATA_RESET_BYTE);
-    Wire.endTransmission(devices[i].address);
   }
 }
 
@@ -129,31 +144,40 @@ void loop() {
       // device has data, ask as long for data as it sends
       // if it never stops sending, we are fucked :)
       byte data = Wire.read();
-      if (data != DATA_STOP_BYTE) {
+      if (data == DATA_STOP_BYTE) {
-        if (data & ALTITUDE_TRIGGER_BIT) {
+        // do not request further data
-          if (data & ALTITUDE_HIGH_BIT) {
+        continue;
-            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, ALTITUDE_SIM_UP);
+      } else if (data == DATA_RESET_BYTE) {
+        // device needs initialization
+        sendMqttMessage(MQTT_SIM_LOG_TOPIC, 2, "got reset byte from ", devices[i].name);
+        sendI2CInit(devices[i]);
       } else {
-            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, ALTITUDE_SIM_DOWN);
+        // handle as payload
+        if (data & TRIGGER_BIT_1) {
+          if (data & HIGH_BIT_1) {
+            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, 1, devices[i].highCommand1);
+          } else {
+            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, 1, devices[i].lowCommand1);
           }
-        } else if (data & HEADING_TRIGGER_BIT) {
+        } else if (data & TRIGGER_BIT_2) {
-          if (data & HEADING_HIGH_BIT) {
+          if (data & HIGH_BIT_2) {
-            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, HEADING_SIM_UP);
+            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, 1, devices[i].highCommand2);
           } else {
-            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, HEADING_SIM_DOWN);
+            sendMqttMessage(MQTT_SIM_COMMAND_TOPIC, 1, devices[i].lowCommand2);
           }
         } else {
           // who are you?
         }
-        Wire.requestFrom(devices[i].address, READ_BYTES_FROM_WIRE);
       }
+
+      Wire.requestFrom(devices[i].address, READ_BYTES_FROM_WIRE);
     }
   }
 
   // transmit MQTT keepalive message if MQTT_KEEPALIVE_INTERVAL_MS is reached
   // or millis() is wrapping to 0
   if (mqttLastKeepAlive + MQTT_KEEPALIVE_INTERVAL_MS < millis() || mqttLastKeepAlive > millis()) {
-    sendMqttMessage(MQTT_SIM_DEVICE_TOPIC, localIP);
+    sendMqttMessage(MQTT_SIM_DEVICE_TOPIC, 1, localIP);
     mqttLastKeepAlive = millis();
   }
 }

rotator/global.h

@@ -0,0 +1 @@
+../master/global.h

rotator/rotator.ino

@@ -1,5 +1,17 @@
 #include <Wire.h>
 
+#include <SPI.h>
+#include <Adafruit_GFX.h>
+#include <Fonts/FreeMonoBold24pt7b.h>
+#include <Fonts/FreeMonoBold18pt7b.h>
+#include <Fonts/FreeMonoBold12pt7b.h>
+#include <Adafruit_SSD1306.h>
+
+#include "global.h"
+
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+
 #define PIN_ROTATOR1_WHITE 2
 #define PIN_ROTATOR1_GREEN 4
 
@@ -10,18 +22,30 @@
 
 #define SKIP_ROTARY_INPUTS 50
 
-// needs global define
+#define INTERNAL_STATE_UNKNOWN 0
-#define DATA_STOP_BYTE 0x00
+#define INTERNAL_STATE_INITIALIZED 1
-#define DATA_RESET_BYTE 0xFF
-#define ROTATOR1_TRIGGER_BIT 1
-#define ROTATOR1_HIGH_BIT 2
-#define ROTATOR2_TRIGGER_BIT 4
-#define ROTATOR2_HIGH_BIT 8
-#define PIN_ADDRESS_1 11
-#define PIN_ADDRESS_2 12
-#define PIN_ADDRESS_3 13
 
-int lastClk = HIGH;
+#define PIN_ADDRESS_1 14
+#define PIN_ADDRESS_2 15
+#define PIN_ADDRESS_3 16
+
+#define PIN_DISPLAY1_DC 8
+#define PIN_DISPLAY1_RST 9
+#define PIN_DISPLAY1_CS 10
+#define PIN_DISPLAY2_DC 6
+#define PIN_DISPLAY2_RST 7
+#define PIN_DISPLAY2_CS 17
+
+Adafruit_SSD1306 display1(SCREEN_WIDTH, SCREEN_HEIGHT,
+  &SPI, PIN_DISPLAY1_DC, PIN_DISPLAY1_RST, PIN_DISPLAY1_CS);
+Adafruit_SSD1306 display2(SCREEN_WIDTH, SCREEN_HEIGHT,
+  &SPI, PIN_DISPLAY2_DC, PIN_DISPLAY2_RST, PIN_DISPLAY2_CS);
+
+char name1[] = {'X', 'X', 'X'};
+char name2[] = {'Y', 'Y', 'Y'};
+int internalState = INTERNAL_STATE_UNKNOWN;
+
+uint8_t lastClk = HIGH;
 
 // ringbuffer of trigger and direction values
 byte valueBuffer[VALUE_BUFFER] = { 0 };
@@ -29,9 +53,21 @@ uint8_t readerPos, writerPos = 0;
 
 void addValue(uint8_t value) {
   valueBuffer[writerPos++] = value;
+
+  // check for writer position overflow
   if (writerPos >= VALUE_BUFFER) {
     writerPos = 0;
   }
+
+  // check if writer overtooks reader
+  // if so, increment reader and check
+  // for reader position overflow
+  if (writerPos == readerPos) {
+    readerPos++;
+    if (readerPos >= VALUE_BUFFER) {
+      readerPos = 0;
+    }
+  }
 }
 
 void falling(uint8_t pin, byte triggerBit, byte highBit) {
@@ -51,15 +87,18 @@ void falling(uint8_t pin, byte triggerBit, byte highBit) {
 }
 
 void rotator1Falling() {
-  falling(PIN_ROTATOR1_GREEN, ROTATOR1_TRIGGER_BIT, ROTATOR1_HIGH_BIT);
+  falling(PIN_ROTATOR1_GREEN, TRIGGER_BIT_1, HIGH_BIT_1);
 }
 
 void rotator2Falling() {
-  falling(PIN_ROTATOR2_GREEN, ROTATOR2_TRIGGER_BIT, ROTATOR2_HIGH_BIT);
+  falling(PIN_ROTATOR2_GREEN, TRIGGER_BIT_2, HIGH_BIT_2);
 }
 
 int eventCount = 0;
 byte lastValue = 0;
+// this method blocks the parallel use of rotators
+// if parallel use should be possible
+// lastValue and eventCount must be stored per rotator
 bool useInput(byte value) {
   if (lastValue == value) {
     // same event as last event
@@ -80,8 +119,14 @@ bool useInput(byte value) {
   }  
 }
 
-
 void i2cRequest() {
+  if (internalState == INTERNAL_STATE_UNKNOWN) {
+    // looks like we were restarted
+    // request initialization first
+    Serial.println("Requesting init");
+    Wire.write(DATA_RESET_BYTE);
+    internalState = INTERNAL_STATE_INITIALIZED;
+  } else {
     // if write is ahead, send data
     if (writerPos != readerPos) {
       byte value = valueBuffer[readerPos++];
@@ -95,20 +140,47 @@ void i2cRequest() {
       Wire.write(DATA_STOP_BYTE);
     }
   }
+}
 
 void i2cReceive(int bytes) {
-  for (int i = 0; i < bytes && Wire.available(); i++) {
+  while (Wire.available()) {
     byte data = Wire.read();
     if (data == DATA_RESET_BYTE) {
+      Serial.println("Received reset request");
       writerPos = readerPos = 0;
+    } else if (data == DATA_INIT_BYTE_1) {
+      Serial.println("Received init 1");
+      // next three bytes are the name of the first rotator
+      for (int i = 0; i < 3 && Wire.available(); i++) {
+        name1[i] = Wire.read();
+      }
+    } else if (data == DATA_INIT_BYTE_2) {
+      Serial.println("Received init 2");
+      // next three bytes are the name of the second rotator
+      for (int i = 0; i < 3 && Wire.available(); i++) {
+        name2[i] = Wire.read();
+      }
     } else {
-      // nothing else yet implemented
+      // not yet implemented?
+      Serial.println("Received unknown");
     }
   }
 }
 
-uint8_t address = 0;
+void displayTestScreen(Adafruit_SSD1306 display) {
+  display.clearDisplay();
+  for (int x = 0; x < SCREEN_WIDTH; x++) {
+    for (int y = 0; y < SCREEN_HEIGHT; y++) {
+      display.drawPixel(x, y, SSD1306_WHITE);
+    }
+  }
+  display.display();
+}
+
+uint8_t address = I2C_ADDRESS_START;
 void setup() {
+  // https://support.arduino.cc/hc/en-us/articles/4839084114460-If-your-board-runs-the-sketch-twice
+  delay(150);
   Serial.begin(115200);
 
   // setup rotator GPIOs
@@ -123,9 +195,9 @@ void setup() {
   pinMode(PIN_ADDRESS_3, INPUT_PULLUP);
 
   // calculate address by LOW GPIOs
-  address = digitalRead(PIN_ADDRESS_1) == LOW;
+  address |= (digitalRead(PIN_ADDRESS_1) == LOW) << 1;
-  address |= (digitalRead(PIN_ADDRESS_2) == LOW) << 1;
+  address |= (digitalRead(PIN_ADDRESS_2) == LOW) << 2;
-  address |= (digitalRead(PIN_ADDRESS_3) == LOW) << 2;
+  address |= (digitalRead(PIN_ADDRESS_3) == LOW) << 3;
 
   attachInterrupt(digitalPinToInterrupt(PIN_ROTATOR1_WHITE), rotator1Falling, FALLING);
   attachInterrupt(digitalPinToInterrupt(PIN_ROTATOR2_WHITE), rotator2Falling, FALLING);
@@ -133,8 +205,60 @@ void setup() {
   Wire.begin(address);
   Wire.onRequest(i2cRequest);
   Wire.onReceive(i2cReceive);
+  
+  if(!display1.begin(SSD1306_SWITCHCAPVCC)) {
+    Serial.println(F("SSD1306 allocation failed (1)"));
+    for(;;); // Don't proceed, loop forever
+  }
+  displayTestScreen(display1);
+  
+  if(!display2.begin(SSD1306_SWITCHCAPVCC)) {
+    Serial.println(F("SSD1306 allocation failed (2)"));
+    for(;;); // Don't proceed, loop forever
+  }
+  displayTestScreen(display2);
+  // make sure, test screen is at least displayed 2 seconds
+  delay(2000);
 }
 
 void loop() {
-  delay(10000);
+  display1.clearDisplay();
+  display1.setTextColor(SSD1306_WHITE); // Draw white text
+  display1.cp437(true);         // Use full 256 char 'Code Page 437' font
+
+  display1.setTextSize(1);      // Normal 1:1 pixel scale
+  display1.setCursor(0, 8);     // Start at top-left corner
+  display1.setFont(NULL);
+  display1.write(name1[0]);
+  display1.write(name1[1]);
+  display1.write(name1[2]);
+  
+  display1.setTextSize(2);      // Normal 1:1 pixel scale
+  display1.setCursor(0, 56);     // Start at top-left corner
+  display1.setFont(&FreeMonoBold18pt7b);
+  display1.write('8');
+  display1.write('9');
+  display1.write('0');
+  display1.display();
+  
+  display2.clearDisplay();
+  display2.setTextColor(SSD1306_WHITE); // Draw white text
+  display2.cp437(true);         // Use full 256 char 'Code Page 437' font
+
+  display2.setTextSize(1);      // Normal 1:1 pixel scale
+  display2.setCursor(0, 8);     // Start at top-left corner
+  display2.setFont(NULL);
+  display2.write(name2[0]);
+  display2.write(name2[1]);
+  display2.write(name2[2]);
+  
+  display2.setTextSize(2);      // Normal 1:1 pixel scale
+  display2.setCursor(0, 56);     // Start at top-left corner
+  display2.setFont(&FreeMonoBold18pt7b);
+  display2.write('1');
+  display2.write('2');
+  display2.write('3');
+  display2.display();
+
+  delay(1000);
 }