PFW-1523 Add the S parameter to M79

Firmware/Marlin_main.cpp

@@ -5853,16 +5853,26 @@ SERIAL_PROTOCOLPGM("\n\n");
     }
 
     /*!
-    ### M79 - TODO
-    Restart the printer-host enable keepalive timer. While the timer has not expired, the printer will enable host specific features.
+    ### M79 - Start host timer <a href="https://reprap.org/wiki/G-code#M79:_Start_host_timer">M79: Start host timer</a>
+    Start the printer-host enable keep-alive timer. While the timer has not expired, the printer will enable host specific features.
     #### Usage
 
-        M79
+        M79 [ S ]
     #### Parameters
-       None
+       - `S` - Quoted string containing two characters e.g. "PL"
     */
     case 79:
         M79_timer_restart();
+
+        if (code_seen('S'))
+        {
+            unquoted_string str = unquoted_string(strchr_pointer);
+            if (str.WasFound())
+            {
+                ResetHostStatusScreenName();
+                SetHostStatusScreenName(str.GetUnquotedString());
+            }
+        }
         break;
 
     /*!

Firmware/host.cpp

@@ -1,8 +1,23 @@
+#include <string.h>
 #include "Configuration_adv.h"
 #include "host.h"
 #include "Timer.h"
 
 static LongTimer M79_timer;
+static char host_status_screen_name[3];
+
+void SetHostStatusScreenName(const char * name) {
+    strncpy(host_status_screen_name, name, 2);
+    host_status_screen_name[2] = '\0';
+}
+
+char * GetHostStatusScreenName() {
+    return host_status_screen_name;
+}
+
+void ResetHostStatusScreenName() {
+    memset(host_status_screen_name, 0, sizeof(host_status_screen_name));
+}
 
 void M79_timer_restart() {
     M79_timer.start();

Firmware/host.h

@@ -1,5 +1,15 @@
 #pragma once
 
+/// Assigns host name with up to two characters which will be shown on
+/// the UI when printing. The function forces the third byte to be null delimiter.
+void SetHostStatusScreenName(const char * name);
+
+/// Returns a pointer to the host name
+char * GetHostStatusScreenName();
+
+/// Reset the memory to NULL when the host name should not be used
+void ResetHostStatusScreenName();
+
 /// Restart the M79 timer
 void M79_timer_restart();
 

Firmware/ultralcd.cpp

@@ -19,7 +19,7 @@
 #include "menu.h"
 
 #include "backlight.h"
-
+#include "host.h"
 #include "util.h"
 #include "mesh_bed_leveling.h"
 #include "mesh_bed_calibration.h"
@@ -359,8 +359,7 @@ void lcdui_print_feedrate(void)
 // Print percent done in form "USB---%", " SD---%", "   ---%" (7 chars total)
 void lcdui_print_percent_done(void)
 {
-	const char* src = usb_timer.running()?_N("USB"):(IS_SD_PRINTING?_N(" SD"):_N("   "));
-	char per[4];
+	const char* src = usb_timer.running()?_N(" HO"):(IS_SD_PRINTING?_N(" SD"):_N("   "));
 	bool num = IS_SD_PRINTING || (printer_active() && (print_percent_done_normal != PRINT_PERCENT_DONE_INIT));
 	if (!num || heating_status != HeatingStatus::NO_HEATING) // either not printing or heating
 	{
@@ -375,8 +374,18 @@ void lcdui_print_percent_done(void)
 			return; //do not also print the percentage
 		}
 	}
-	sprintf_P(per, num?_N("%3d"):_N("---"), calc_percent_done());
-	lcd_printf_P(_N("%3S%3s%%"), src, per);
+
+    if (!IS_SD_PRINTING && M79_timer_get_status() && GetHostStatusScreenName())
+    {
+        // Overwrite the name
+        char * hostName = GetHostStatusScreenName();
+        lcd_space(1);    // Blank space
+        lcd_print(hostName); // Two characters
+    } else {
+        lcd_printf_P(PSTR("%3S"), src);
+    }
+
+    lcd_printf_P(num ? _N("%3d%%"):_N("---%%"), calc_percent_done());
 }
 
 // Print extruder status (5 chars total)

Firmware/util.cpp

@@ -385,36 +385,16 @@ void gcode_level_check(uint16_t nGcodeLevel) {
     );
 }
 
-#define GCODE_DELIMITER '"'
-
-char *code_string(const char *pStr, size_t *nLength) {
-char* pStrBegin;
-char* pStrEnd;
-
-pStrBegin=strchr(pStr,GCODE_DELIMITER);
-if(!pStrBegin)
-     return(NULL);
-pStrBegin++;
-pStrEnd=strchr(pStrBegin,GCODE_DELIMITER);
-if(!pStrEnd)
-     return(NULL);
-*nLength=pStrEnd-pStrBegin;
-return pStrBegin;
-}
 
 void printer_smodel_check(const char *pStrPos, const char *actualPrinterSModel) {
-    char* pResult;
-    size_t nLength;
-    size_t aLength;
-
-    pResult=code_string(pStrPos,&nLength);
-    if(pResult != NULL) {
-        aLength=strlen_P(actualPrinterSModel);
-        if(aLength > nLength) nLength = aLength;
-
-        // Only compare first 6 chars on MK3|MK3S if string longer than 4 characters
-        if (nLength > 4 && strncmp_P(pResult, PSTR("MK3"), 3) == 0) nLength = 6;
-        if (strncmp_P(pResult, actualPrinterSModel, nLength) == 0) return;
+    unquoted_string smodel = unquoted_string(pStrPos);
+
+    if(smodel.WasFound()) {
+        const uint8_t compareLength = strlen_P(actualPrinterSModel);
+
+        if(compareLength == smodel.GetLength()) {
+            if (strncmp_P(smodel.GetUnquotedString(), actualPrinterSModel, compareLength) == 0) return;
+        }
     }
 
     render_M862_warnings(

Firmware/util.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <stdint.h>
+#include <string.h>
 
 extern const uint16_t FW_VERSION_NR[4];
 const char* FW_VERSION_STR_P();
@@ -84,6 +85,46 @@ enum class ClCompareValue:uint_least8_t
     _Greater=2
 };
 
+struct unquoted_string {
+public:
+    /// @brief Given a pointer to a quoted string, filter out the quotes
+    /// @param pStr A constant pointer to a constant string to be searched/filtered. Modifying the pointer is strictly forbidden.
+    /// NOTE: Forcing inline saves ~36 bytes of flash
+    inline __attribute__((always_inline)) unquoted_string(const char * const pStr)
+    : len(0)
+    , found(false)
+    {
+        char * pStrEnd = NULL;
+
+        // Start of the string
+        this->ptr = strchr(pStr, '"');
+        if (!this->ptr) {
+            // First quote not found
+            return;
+        }
+
+        // Skip the leading quote
+        this->ptr++;
+
+        // End of the string
+        pStrEnd = strchr(this->ptr, '"');
+        if(!pStrEnd) {
+            // Second quote not found
+            return;
+        }
+        this->len = pStrEnd - this->ptr;
+        this->found = true;
+    }
+
+    bool WasFound() { return found; }
+    uint8_t GetLength() { return len; }
+    const char * GetUnquotedString() { return ptr; }
+private:
+    const char * ptr = NULL;
+    uint8_t len;
+    bool found;
+};
+
 extern ClNozzleDiameter oNozzleDiameter;
 extern ClCheckMode oCheckMode;
 extern ClCheckModel oCheckModel;