Added initialization sequence

Added EEPROM persistence

src/include/colors.h

@@ -0,0 +1,23 @@
+#ifndef __colors
+#define __colors
+
+#define BLACK    0x0000
+#define BLUE     0x001F
+#define RED      0xF800
+#define GREEN    0x07E0
+#define CYAN     0x07FF
+#define MAGENTA  0xF81F
+#define YELLOW   0xFFE0
+#define WHITE    0xFFFF
+
+
+#define COLOR_INITSEQ_BACKGROUND BLACK
+#define COLOR_INITSEQ_TITLE YELLOW
+#define COLOR_INITSEQ_ITEMS WHITE
+#define COLOR_INITSEQ_SUCCESS GREEN
+#define COLOR_INITSEQ_ERROR RED
+
+
+#define COLOR_MENU_BACKGROUND BLACK
+
+#endif

src/lib/persist.cpp

@@ -0,0 +1,39 @@
+#include "./persist.h"
+#include <EEPROM.h>
+
+
+void Persist::init()
+{
+  PersistHeader header;
+  EEPROM.get(0, header);
+
+  if (header.identifier == PersistIdentifier)
+  {
+    if (header.version >= 1)
+        this->readHeights();
+
+    this->initialized = true;
+  }
+}
+
+
+void Persist::readHeights()
+{
+  EEPROM.get(PersistHeightsAddress, this->heights);
+}
+
+
+void Persist::writeHeights()
+{
+  EEPROM.put(PersistHeightsAddress, this->heights);
+}
+
+
+void Persist::setHeightOffset(uint8_t newValue)
+{
+  if (newValue == this->heights.offset)
+    return;
+
+  this->heights.offset = newValue;
+  this->writeHeights();
+}

src/lib/persist.h

@@ -0,0 +1,50 @@
+#ifndef __persist
+#define __persist
+#include <stdint.h>
+#include <string.h>
+
+
+#define PersistIdentifier 0x42
+#define PersistVersion1 1
+
+
+struct PersistHeader
+{
+  uint8_t identifier;
+  uint8_t version;
+};
+
+
+#define PersistHeightsAddress sizeof(PersistHeader)
+struct PersistHeights
+{
+  uint8_t offset;
+  uint16_t setting[2];
+};
+
+
+
+class Persist
+{
+  public:
+    Persist()
+    {
+      memset(&this->heights, 0, sizeof(PersistHeights));
+    }
+
+    void init();
+
+    // How many centimeters up the reflective surface is from the ground
+    uint8_t getHeightOffset() { return this->heights.offset; }
+    void setHeightOffset(uint8_t newValue);
+
+
+  private:
+    void readHeights();
+    void writeHeights();
+
+    bool initialized = false;
+    PersistHeights heights;
+};
+
+#endif

src/main.cpp

@@ -5,48 +5,124 @@
 
 #include "./include/display.h"
 #include "./include/heightsensor.h"
+#include "./include/colors.h"
+#include "./lib/persist.h"
 #include "./lib/menu.h"
 #include "./lib/vl53l0x.h"
 
 
+// Forward declarations
+void initSequenceStart();
+void initSequenceSuccess(uint8_t which);
+void initSequenceError(uint8_t which, const char* message);
+
+#define INITSEQ_EEPROM 0
+#define INITSEQ_HEIGHTSENSORINIT 1
+#define INITSEQ_HEIGHTSENSORBUDGET 2
+#define INITSEQ_HEIGHTSENSORTEST 3
+#define INITSEQ_MAX INITSEQ_HEIGHTSENSORINIT
+
+
+
 auto display = Adafruit_ST7789(DISPLAY_PORT_CS, DISPLAY_PORT_DC, DISPLAY_PORT_RST);
 auto heightSensor = VL53L0X();
 
+auto persist = Persist();
 auto menu = Menu(&display);
 
 
+
 void setup()
 {
   display.init(DISPLAY_WIDTH, DISPLAY_HEIGHT, SPI_MODE3);
   display.setRotation(DISPLAY_ROTATION);
-  display.fillScreen(ST77XX_BLACK);
 
-  menu.init();
+  initSequenceStart();
 
-  // TODO draw "initializing" text
 
+  // Load settings from EEPROM
+  persist.init();
+  initSequenceSuccess(INITSEQ_EEPROM);
+
+
+
+  // Initialize VL53L0X sensor
   Wire.begin();
 
   VL53L0XResult result;
   if (!heightSensor.init(HEIGHTSENSOR_I2C_ADDRESS, &result))
   {
-    // TODO draw "height sensor error" text
-
+    initSequenceError(INITSEQ_HEIGHTSENSORINIT, "TODO: error message");
     while(1);
   }
+  initSequenceSuccess(INITSEQ_HEIGHTSENSORINIT);
+
 
   VL53L0X_Error error;
   if (!heightSensor.setMeasurementTimingBudget(33000, &error))
   {
-    // TODO draw "height sensor budget error" text
-
+    initSequenceError(INITSEQ_HEIGHTSENSORBUDGET, "TODO: error message");
     while(1);
   }
+  initSequenceSuccess(INITSEQ_HEIGHTSENSORBUDGET);
 
-  display.fillScreen(ST77XX_BLACK);
+
+  // TODO height sensor test - are we getting stable values
+  initSequenceSuccess(INITSEQ_HEIGHTSENSORTEST);
+
+
+  delay(1000);
+
+
+  // Show the main menu
+  display.fillScreen(COLOR_MENU_BACKGROUND);
+  menu.init();
 }
 
+
 void loop()
 {
   // TODO
 }
+
+
+
+/*
+
+  Helper functions for the status display during the initialization sequence
+
+*/
+// Default font is 5x7, x2 for the current text size
+#define initSequenceTextY(which) ((1 + which) * 14)
+
+void initSequenceStart()
+{
+  display.fillScreen(COLOR_INITSEQ_BACKGROUND);
+  display.setTextSize(2);
+
+  display.setCursor(0, 0);
+  display.setTextColor(COLOR_INITSEQ_TITLE);
+  display.println("Initializing...");
+
+  display.setTextColor(COLOR_INITSEQ_ITEMS);
+  display.println("  reading EEPROM");
+  display.println("  height sensor init");
+  display.println("  height sensor budget");
+  display.println("  height sensor test");
+}
+
+
+void initSequenceSuccess(uint8_t which)
+{
+
+  display.drawChar(0, initSequenceTextY(which), 'v', COLOR_INITSEQ_SUCCESS, GREEN, 2);
+}
+
+
+void initSequenceError(uint8_t which, const char* message)
+{
+  display.drawChar(0, initSequenceTextY(which), 'x', COLOR_INITSEQ_ERROR, COLOR_INITSEQ_ERROR, 2);
+
+  display.setCursor(0, initSequenceTextY(INITSEQ_MAX + 2));
+  display.print(message);
+}