Bitwise operations

Bitwise/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_executable (Bitwize
+  main.cpp
+)

Bitwise/main.cpp

@@ -0,0 +1,193 @@
+#include <stdio.h>
+#include <iostream>
+
+enum SemaState
+{
+    SS_GREEN = 1,
+    SS_YELLOW = 2,
+    SS_RED = 4
+};
+
+void PrintSemafore(int state)
+{
+    bool isRed = (state & SS_RED) > 0;
+    bool isYellow = (state & SS_YELLOW) > 0;
+    bool isGreen = (state & SS_GREEN) > 0;
+
+    printf("[%c]\n[%c]\n[%c]\n", isRed ? 'R' : ' ', isYellow ? 'Y' : ' ', isGreen ? 'G' : ' ');
+}
+
+int NextSemafore(int state)
+{
+    if ((state & SS_GREEN) > 0)
+    {
+        return SS_YELLOW;
+    }
+    if ((state & SS_RED))
+    {
+        if ((state & SS_YELLOW))
+        {
+            return SS_GREEN;
+        }
+        else
+        {
+            return SS_RED|SS_YELLOW;
+        }
+    }
+    return SS_RED;
+}
+
+void TestSemafore()
+{
+    int state = SS_GREEN;
+    char answer = 'y';
+    while (answer == 'y')
+    {
+        PrintSemafore(state);
+        std::cout << "Continue ? ";
+        std::cin >> answer;
+        state = NextSemafore(state);
+    }
+}
+
+enum LabelColor
+{
+    LC_RED,
+    LC_ORANGE,
+    LC_YELLOW,
+    LC_OLIVE,
+    LC_GREEN,
+    LC_BLUE,
+    LC_VIOLET,
+    LC_WHITE
+};  // 8 elements - reserving 4 bits
+
+enum LabelAlign
+{
+    LA_TOP,
+    LA_CENTER,
+    LA_BOTTOM
+};  // 4 elements - reserving 2 bits
+
+uint32_t ConvertLabelSettingsToInt(bool visible, bool enable, LabelColor color, LabelAlign align, int8_t xoffset)
+{
+    uint32_t result = 0;
+
+    // 0 bit
+    if (visible)
+    {
+        result |= 0x00000001;
+    }
+
+    // 1 bit
+    if (enable)
+    {
+        result |= 0x00000002;
+    }
+
+    // 2..5 bits
+    uint32_t colorValue = color << 2;
+    result |= colorValue;
+
+    // 6..7 bits
+    uint32_t alignValue = align << 6;
+    result |= alignValue;
+
+    // 8 - 15 bits
+    uint32_t offsetValue = (uint8_t)xoffset << 8;
+    result |= offsetValue;
+
+    return result;
+}
+
+void PrintlabelSettings(uint32_t settings)
+{
+    bool visible = (settings & 0x00000001) > 0;
+    bool enable = (settings & 0x00000002) > 0;
+    uint32_t mask = 0x00000004|0x00000008|0x00000010|0x00000020;
+    LabelColor color = (LabelColor)((settings & mask) >> 2);
+    mask = 0x00000040|0x00000080;
+    LabelAlign align = (LabelAlign)((settings & mask) >> 6);
+    mask = 0x0000ff00;
+    int8_t offset = (int8_t)((settings & mask) >> 8);
+    printf("visible:%i, enable:%i, color:%i, align:%i, xoffset:%i\n", visible, enable, color, align, offset);
+}
+
+void SetLabelVisible(uint32_t* settings, bool value)
+{
+    if (value)
+    {
+        *settings |= 0x00000001;
+    }
+    else
+    {
+        *settings &= ~0x00000001;
+    }
+}
+
+void SetLabelEnable(uint32_t* settings, bool value)
+{
+    if (value)
+    {
+        *settings |= 0x00000002;
+    }
+    else
+    {
+        *settings &= ~0x00000002;
+    }
+}
+
+void TestLabelSettings()
+{
+    uint32_t labelSettings = ConvertLabelSettingsToInt(true, true, LC_OLIVE, LA_CENTER, -53);
+    PrintlabelSettings(labelSettings);
+    SetLabelVisible(&labelSettings, false);
+    PrintlabelSettings(labelSettings);
+    SetLabelEnable(&labelSettings, false);
+    PrintlabelSettings(labelSettings);
+}
+
+void SwitchLamps(uint8_t* lamps, int begin, int end, bool value)
+{
+    uint8_t mask = 0;
+    for (int i = begin; i <= end; ++i)
+    {
+        mask |= 0x01 << i;
+    }
+    if (value)
+    {
+        *lamps |= mask;
+    }
+    else
+    {
+        *lamps &= ~mask;
+    }
+}
+
+void PrintLampsState(uint8_t lamps)
+{
+    for (uint8_t mask = 0x80; mask > 0; mask >>= 1)
+    {
+        std::cout << ((lamps & mask) ? '1' : '0');
+    }
+    std::cout << std::endl;
+}
+
+void TestLamps()
+{
+    uint8_t lamps = 0;
+    PrintLampsState(lamps);
+    SwitchLamps(&lamps, 2, 6, true);
+    PrintLampsState(lamps);
+    SwitchLamps(&lamps, 4, 7, false);
+    PrintLampsState(lamps);
+}
+
+int main()
+{
+    // TestSemafore();
+    // TestLabelSettings();
+    TestLamps();
+
+    return 0;
+}

CMakeLists.txt

@@ -3,6 +3,7 @@ project (Examples)
 
 set (CMAKE_CXX_FLAGS "--std=c++11 ${CMAKE_CXX_FLAGS}")
 
+add_subdirectory (Bitwise)
 add_subdirectory (DynStructures)
 add_subdirectory (Hello)
 add_subdirectory (oop)