Update OSD unit test as per comments from @ledvinap

src/main/drivers/max7456_symbols.h

@@ -21,6 +21,8 @@
 
 #pragma once
 
+#define SYM_END_OF_FONT 0xFF
+
 // Character Symbols
 #define SYM_BLANK 0x20
 

src/main/io/osd.c

@@ -755,10 +755,10 @@ void pgResetFn_osdConfig(osdConfig_t *osdConfig)
 static void osdDrawLogo(int x, int y)
 {
     // display logo and help
-    unsigned char fontOffset = 160;
+    int fontOffset = 160;
     for (int row = 0; row < 4; row++) {
         for (int column = 0; column < 24; column++) {
-            if (fontOffset != 255) // FIXME magic number
+            if (fontOffset <= SYM_END_OF_FONT)
                 displayWriteChar(osdDisplayPort, x + column, y + row, fontOffset++);
         }
     }
@@ -801,7 +801,6 @@ void osdInit(displayPort_t *osdDisplayPortToUse)
 void osdUpdateAlarms(void)
 {
     // This is overdone?
-    // uint16_t *itemPos = osdConfig()->item_pos;
 
     int32_t alt = osdGetMetersToSelectedUnit(getEstimatedAltitude()) / 100;
 
@@ -1051,7 +1050,7 @@ STATIC_UNIT_TESTED void osdRefresh(timeUs_t currentTimeUs)
         armState = ARMING_FLAG(ARMED);
     }
 
-    statRssi = rssi * 100 / 1024;
+    statRssi = scaleRange(rssi, 0, 1024, 0, 100);
 
     osdUpdateStats();
 

src/main/io/osd.h

@@ -29,9 +29,10 @@
 // Character coordinate
 
 #define OSD_POSITION_BITS 5 // 5 bits gives a range 0-31
-#define OSD_POS(x,y)  ((x & 0x001F) | ((y & 0x001F) << OSD_POSITION_BITS))
-#define OSD_X(x)      (x & 0x001F)
-#define OSD_Y(x)      ((x >> OSD_POSITION_BITS) & 0x001F)
+#define OSD_POSITION_XY_MASK ((1 << OSD_POSITION_BITS) - 1)
+#define OSD_POS(x,y)  ((x & OSD_POSITION_XY_MASK) | ((y & OSD_POSITION_XY_MASK) << OSD_POSITION_BITS))
+#define OSD_X(x)      (x & OSD_POSITION_XY_MASK)
+#define OSD_Y(x)      ((x >> OSD_POSITION_BITS) & OSD_POSITION_XY_MASK)
 
 typedef enum {
     OSD_RSSI_VALUE,

src/test/unit/osd_unittest.cc

@@ -102,7 +102,7 @@ void doTestArm(bool testEmpty = true)
 
     // given
     // armed alert times out (0.5 seconds)
-    simulationTime += 5e5;
+    simulationTime += 0.5e6;
 
     // when
     // sufficient OSD updates have been called
@@ -114,9 +114,7 @@ void doTestArm(bool testEmpty = true)
     displayPortTestPrint();
 #endif
     if (testEmpty) {
-        for (size_t i = 0; i < UNITTEST_DISPLAYPORT_BUFFER_LEN; i++) {
-            EXPECT_EQ(' ', testDisplayPortBuffer[i]);
-        }
+        displayPortTestBufferIsEmpty();
     }
 }
 
@@ -320,7 +318,7 @@ TEST(OsdTest, TestStatsImperial)
     displayPortTestBufferSubstring(2, 6,  "MAX DISTANCE      : 328%c", SYM_FT);
     displayPortTestBufferSubstring(2, 7,  "MIN BATTERY       : 14.7%c", SYM_VOLT);
     displayPortTestBufferSubstring(2, 8,  "END BATTERY       : 15.2%c", SYM_VOLT);
-    displayPortTestBufferSubstring(2, 9,  "MIN RSSI          : 25%");
+    displayPortTestBufferSubstring(2, 9,  "MIN RSSI          : 25%%");
     displayPortTestBufferSubstring(2, 10, "MAX ALTITUDE      :  6.5%c", SYM_FT);
 }
 
@@ -369,7 +367,7 @@ TEST(OsdTest, TestStatsMetric)
     displayPortTestBufferSubstring(2, 6,  "MAX DISTANCE      : 100%c", SYM_M);
     displayPortTestBufferSubstring(2, 7,  "MIN BATTERY       : 14.7%c", SYM_VOLT);
     displayPortTestBufferSubstring(2, 8,  "END BATTERY       : 15.2%c", SYM_VOLT);
-    displayPortTestBufferSubstring(2, 9,  "MIN RSSI          : 25%");
+    displayPortTestBufferSubstring(2, 9,  "MIN RSSI          : 25%%");
     displayPortTestBufferSubstring(2, 10, "MAX ALTITUDE      :  2.0%c", SYM_M);
 }
 
@@ -406,8 +404,9 @@ TEST(OsdTest, TestAlarms)
 
     // then
     // no elements should flash as all values are out of alarm range
-    for (int i = 0; i < 6; i++) {
-        simulationTime += 1e6;
+    for (int i = 0; i < 30; i++) {
+        // Check for visibility every 100ms, elements should always be visible
+        simulationTime += 0.1e6;
         osdRefresh(simulationTime);
 
 #ifdef DEBUG_OSD
@@ -433,15 +432,16 @@ TEST(OsdTest, TestAlarms)
 
     // then
     // elements showing values in alarm range should flash
-    for (int i = 0; i < 6; i++) {
-        simulationTime += 1e6;
+    for (int i = 0; i < 15; i++) {
+        // Blinking should happen at 5Hz
+        simulationTime += 0.2e6;
         osdRefresh(simulationTime);
 
 #ifdef DEBUG_OSD
         printf("%d\n", i);
         displayPortTestPrint();
 #endif
-        if (i % 2 == 1) {
+        if (i % 2 == 0) {
             displayPortTestBufferSubstring(8,  1, "%c12", SYM_RSSI);
             displayPortTestBufferSubstring(12, 1, "%c13.5%c", SYM_MAIN_BATT, SYM_VOLT);
             displayPortTestBufferSubstring(1,  1, "%c01:", SYM_FLY_M); // only test the minute part of the timer

src/test/unit/unittest_displayport.h

@@ -26,6 +26,8 @@ extern "C" {
 #include "unittest_macros.h"
 #include "gtest/gtest.h"
 
+void displayPortTestBufferSubstring(int x, int y, const char * expectedFormat, ...) __attribute__ ((format (printf, 3, 4)));
+
 #define UNITTEST_DISPLAYPORT_ROWS 16
 #define UNITTEST_DISPLAYPORT_COLS 30
 #define UNITTEST_DISPLAYPORT_BUFFER_LEN (UNITTEST_DISPLAYPORT_ROWS * UNITTEST_DISPLAYPORT_COLS)
@@ -146,11 +148,11 @@ void displayPortTestBufferIsEmpty()
 
 void displayPortTestBufferSubstring(int x, int y, const char * expectedFormat, ...)
 {
-    char expected[32];
+    char expected[UNITTEST_DISPLAYPORT_BUFFER_LEN];
 
     va_list args;
     va_start(args, expectedFormat);
-    vsprintf(expected, expectedFormat, args);
+    vsnprintf(expected, UNITTEST_DISPLAYPORT_BUFFER_LEN, expectedFormat, args);
     va_end(args);
 
 #ifdef DEBUG_OSD