Rewrite EEPROM.h to avoid GNU-licensed code

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## [Unreleased]
 ### Added
 - Add `__AVR__` to defines when compiling
+- Support for mock EEPROM (but only if board supports it)
 
 ### Changed
 - Move repository from https://github.com/ianfixes/arduino_ci to https://github.com/Arduino-CI/arduino_ci

REFERENCE.md

@@ -581,3 +581,40 @@ unittest(spi) {
   assertEqual("LMNOe", String(inBuf));
 }
 ```
+
+### EEPROM
+
+`EEPROM` is a global with a simple API to read and write bytes to persistent memory (like a tiny hard disk) given an `int` location. Since the Arduino core already provides this as a global, and the core API is sufficient for basic testing (read/write), there is no direct tie to the `GODMODE` API. (If you need more, such as a log of intermediate values, enter a feature request.)
+
+```C++
+unittest(eeprom)
+{
+  uint8_t a;
+  // size
+  assertEqual(EEPROM_SIZE, EEPROM.length());
+  // initial values
+  a = EEPROM.read(0);
+  assertEqual(255, a);
+  // write and read
+  EEPROM.write(0, 24);
+  a = EEPROM.read(0);
+  assertEqual(24, a);
+  // update
+  EEPROM.write(1, 14);
+  EEPROM.update(1, 22);
+  a = EEPROM.read(1);
+  assertEqual(22, a);
+  // put and get
+  const float f1 = 0.025f;
+  float f2 = 0.0f;
+  EEPROM.put(5, f1);
+  assertEqual(0.0f, f2);
+  EEPROM.get(5, f2);
+  assertEqual(0.025f, f2);
+  // array access
+  int val = 10;
+  EEPROM[2] = val;
+  a = EEPROM[2];
+  assertEqual(10, a);
+}
+```

SampleProjects/TestSomething/test/eeprom.cpp

@@ -0,0 +1,80 @@
+#include <ArduinoUnitTests.h>
+#include <Arduino.h>
+#include <Godmode.h>
+
+// Only run EEPROM tests if there is hardware support!
+#if defined(EEPROM_SIZE)
+#include <EEPROM.h>
+
+GodmodeState* state = GODMODE();
+
+unittest_setup()
+{
+  state->reset();
+}
+
+unittest(length)
+{
+  assertEqual(EEPROM_SIZE, EEPROM.length());
+}
+
+unittest(firstRead) 
+{
+  uint8_t a = EEPROM.read(0);
+  assertEqual(255, a);
+}
+
+unittest(writeRead)
+{
+  EEPROM.write(0, 24);
+  uint8_t a = EEPROM.read(0);
+  assertEqual(24, a);
+
+  EEPROM.write(0, 128);
+  a = EEPROM.read(0);
+  assertEqual(128, a);
+
+  EEPROM.write(0, 255);
+  a = EEPROM.read(0);
+  assertEqual(255, a);
+
+  int addr = EEPROM_SIZE / 2;
+  EEPROM.write(addr, 63);
+  a = EEPROM.read(addr);
+  assertEqual(63, a);
+
+  addr = EEPROM_SIZE - 1;
+  EEPROM.write(addr, 188);
+  a = EEPROM.read(addr);
+  assertEqual(188, a);
+}
+
+unittest(updateWrite)
+{
+  EEPROM.write(1, 14);
+  EEPROM.update(1, 22);
+  uint8_t a = EEPROM.read(1);
+  assertEqual(22, a);
+}
+
+unittest(putGet)
+{
+  const float f1 = 0.025f;
+  float f2 = 0.0f;
+  EEPROM.put(5, f1);
+  assertEqual(0.0f, f2);
+  EEPROM.get(5, f2);
+  assertEqual(0.025f, f2);
+}
+
+unittest(array)
+{
+  int val = 10;
+  EEPROM[2] = val;
+  uint8_t a = EEPROM[2];
+  assertEqual(10, a);
+}
+
+#endif
+
+unittest_main()

cpp/arduino/EEPROM.h

@@ -0,0 +1,64 @@
+#pragma once
+
+#include <cassert>
+#include <inttypes.h>
+#include <Godmode.h>
+
+// Does the current board have EEPROM?
+#ifndef EEPROM_SIZE
+  // In lieu of an "EEPROM.h not found" error for unsupported boards
+  #error "EEPROM library not available for your board"
+#endif
+
+class EEPROMClass {
+private:
+  GodmodeState* state;
+public:
+  // constructor
+  EEPROMClass() {
+    state = GODMODE();
+  }
+  // array subscript operator
+  uint8_t &operator[](const int index) {
+    assert(index < EEPROM_SIZE);
+    return state->eeprom[index];
+  }
+
+  uint8_t read(const int index) {
+    assert(index < EEPROM_SIZE);
+    return state->eeprom[index];
+  }
+
+  void write(const int index, const uint8_t value) {
+    assert(index < EEPROM_SIZE);
+    state->eeprom[index] = value;
+  }
+
+  void update(const int index, const uint8_t value) {
+    assert(index < EEPROM_SIZE);
+    state->eeprom[index] = value;
+  }
+
+  uint16_t length() { return EEPROM_SIZE; }
+
+  // read any object
+  template <typename T> T &get(const int index, T &object) {
+    uint8_t *ptr = (uint8_t *)&object;
+    for (int i = 0; i < sizeof(T); ++i) {
+      *ptr++ = read(index + i);
+    }
+    return object;
+  }
+
+  // write any object
+  template <typename T> const T &put(const int index, T &object) {
+    const uint8_t *ptr = (const uint8_t *)&object;
+    for (int i = 0; i < sizeof(T); ++i) {
+      write(index + i, *ptr++);
+    }
+    return object;
+  }
+};
+
+// global available in Godmode.cpp
+extern EEPROMClass EEPROM;

cpp/arduino/Godmode.cpp

@@ -113,3 +113,6 @@ SPIClass SPI = SPIClass(&GODMODE()->spi.dataIn, &GODMODE()->spi.dataOut);
 
 // defined in Wire.h
 TwoWire Wire = TwoWire();
+
+#include <EEPROM.h>
+EEPROMClass EEPROM;

cpp/arduino/Godmode.h

@@ -30,6 +30,17 @@ unsigned long micros();
   #define NUM_SERIAL_PORTS 0
 #endif
 
+// different EEPROM implementations have different macros that leak out
+#if !defined(EEPROM_SIZE) && defined(E2END) && (E2END)
+  // public value indicates that feature is available
+  #define EEPROM_SIZE (E2END + 1)
+  // local array size
+  #define _EEPROM_SIZE EEPROM_SIZE
+#else
+  // feature is not available but we want to have the array so other code compiles
+  #define _EEPROM_SIZE (0)
+#endif 
+
 class GodmodeState {
   private:
     struct PortDef {
@@ -54,6 +65,7 @@ class GodmodeState {
     struct PortDef serialPort[NUM_SERIAL_PORTS];
     struct InterruptDef interrupt[MOCK_PINS_COUNT]; // not sure how to get actual number
     struct PortDef spi;
+    uint8_t eeprom[_EEPROM_SIZE];
 
     void resetPins() {
       for (int i = 0; i < MOCK_PINS_COUNT; ++i) {
@@ -87,12 +99,19 @@ class GodmodeState {
       spi.readDelayMicros = 0;
     }
 
+    void resetEEPROM() {
+      for(int i = 0; i < EEPROM_SIZE; ++i){
+        eeprom[i] = 255;
+      }
+    }
+
     void reset() {
       resetClock();
       resetPins();
       resetInterrupts();
       resetPorts();
       resetSPI();
+      resetEEPROM();
       seed = 1;
     }