Return try-load reporting to serial

Firmware/mmu2.cpp

@@ -300,7 +300,7 @@ bool MMU2::VerifyFilamentEnteredPTFE() {
     if (!filament_inserted) {
         IncrementLoadFails();
     }
-
+    tlur.DumpToSerial();
     return filament_inserted;
 }
 

Firmware/mmu2_reporting.cpp

@@ -304,6 +304,7 @@ TryLoadUnloadReporter::TryLoadUnloadReporter(float delta_mm)
     // Clear the status line
     lcd_set_cursor(0, 3);
     lcd_space(LCD_WIDTH);
+    static_assert(LCD_WIDTH < 32); // for progress bits
 }
 
 void TryLoadUnloadReporter::Render(uint8_t col, bool sensorState) {
@@ -320,9 +321,27 @@ void TryLoadUnloadReporter::Progress(bool sensorState){
         dpixel0 = dpixel1;
         if (lcd_cursor_col > (LCD_WIDTH - 1)) lcd_cursor_col = LCD_WIDTH - 1;
         Render(lcd_cursor_col++, sensorState);
+        progress.dw <<= 1;
+        if(sensorState){
+            progress.bytes[0] |= 1;
+        }
     }
 }
 
+void TryLoadUnloadReporter::DumpToSerial(){
+    char buf[LCD_WIDTH + 1];
+    PU tmpProgress { progress.dw }; // avoid storing the shifted progress back into the memory - saves 4 instructions ;)
+
+    // fill the buffer from the back - the last recorded fs state shall be printed as the last character
+    // i < 0xff means we go from LCD_WIDTH-1 down to zero included (LCD_WIDTH-1 is less than 0xff)
+    for (uint8_t i = LCD_WIDTH - 1; i < 0xff; --i) {
+        buf[i] = (tmpProgress.bytes[0] & 1) + '0';
+        tmpProgress.dw >>= 1;
+    }
+    buf[LCD_WIDTH] = 0;
+    MMU2_ECHO_MSGLN(buf);
+}
+
 void IncrementLoadFails(){
     eeprom_increment_byte((uint8_t *)EEPROM_MMU_LOAD_FAIL);
     eeprom_increment_word((uint16_t *)EEPROM_MMU_LOAD_FAIL_TOT);

Firmware/mmu2_reporting.h

@@ -50,6 +50,7 @@ void ReportProgressHook(CommandInProgress cip, ProgressCode ec);
 struct TryLoadUnloadReporter {
     TryLoadUnloadReporter(float delta_mm);
     void Progress(bool sensorState);
+    void DumpToSerial();
 
 private:
     /// @brief Add one block to the progress bar
@@ -64,6 +65,17 @@ private:
     // Note: Below is the reciprocal of (2 * delta_mm) / LCD_WIDTH [mm/pixel]
     float pixel_per_mm;
     uint8_t lcd_cursor_col;
+
+    // Beware: needs to be a union to optimize for the 8bit better
+    union __attribute__((packed)) PU {
+        uint32_t dw;
+        uint8_t bytes[4];
+        constexpr PU()
+            : dw(0) {}
+        constexpr PU(uint32_t dw)
+            : dw(dw) {}
+    } progress;
+    static_assert(sizeof(PU) == 4);
 };
 
 /// Remders the sensor status line. Also used by the "resume temperature" screen.