Fix name collision in ArduinoISP sketch with function declared by Mbed OS

The name collision between the variable named "error" in the ArduinoISP sketch and a function of that name declared by Mbed OS causes compilation of the sketch to fail for boards that use the "Arduino nRF528x Boards (Mbed OS)" or "Arduino Mbed OS Boards (nRF52840 / STM32H747)" cores.

Author: per1234

Diff for: examples/11.ArduinoISP/ArduinoISP/ArduinoISP.ino

@@ -233,7 +233,7 @@ void setup() {
 
 }
 
-int error = 0;
+int ISPError = 0;
 int pmode = 0;
 // address for reading and writing, set by 'U' command
 unsigned int here;
@@ -293,7 +293,7 @@ void loop(void) {
     digitalWrite(LED_PMODE, LOW);
   }
   // is there an error?
-  if (error) {
+  if (ISPError) {
     digitalWrite(LED_ERR, HIGH);
   } else {
     digitalWrite(LED_ERR, LOW);
@@ -344,7 +344,7 @@ void empty_reply() {
     SERIAL.print((char)STK_INSYNC);
     SERIAL.print((char)STK_OK);
   } else {
-    error++;
+    ISPError++;
     SERIAL.print((char)STK_NOSYNC);
   }
 }
@@ -355,7 +355,7 @@ void breply(uint8_t b) {
     SERIAL.print((char)b);
     SERIAL.print((char)STK_OK);
   } else {
-    error++;
+    ISPError++;
     SERIAL.print((char)STK_NOSYNC);
   }
 }
@@ -494,7 +494,7 @@ void write_flash(int length) {
     SERIAL.print((char) STK_INSYNC);
     SERIAL.print((char) write_flash_pages(length));
   } else {
-    error++;
+    ISPError++;
     SERIAL.print((char) STK_NOSYNC);
   }
 }
@@ -523,7 +523,7 @@ uint8_t write_eeprom(unsigned int length) {
   unsigned int start = here * 2;
   unsigned int remaining = length;
   if (length > param.eepromsize) {
-    error++;
+    ISPError++;
     return STK_FAILED;
   }
   while (remaining > EECHUNK) {
@@ -564,7 +564,7 @@ void program_page() {
       SERIAL.print((char) STK_INSYNC);
       SERIAL.print(result);
     } else {
-      error++;
+      ISPError++;
       SERIAL.print((char) STK_NOSYNC);
     }
     return;
@@ -608,7 +608,7 @@ void read_page() {
   length += getch();
   char memtype = getch();
   if (CRC_EOP != getch()) {
-    error++;
+    ISPError++;
     SERIAL.print((char) STK_NOSYNC);
     return;
   }
@@ -624,7 +624,7 @@ void read_page() {
 
 void read_signature() {
   if (CRC_EOP != getch()) {
-    error++;
+    ISPError++;
     SERIAL.print((char) STK_NOSYNC);
     return;
   }
@@ -647,7 +647,7 @@ void avrisp() {
   uint8_t ch = getch();
   switch (ch) {
     case '0': // signon
-      error = 0;
+      ISPError = 0;
       empty_reply();
       break;
     case '1':
@@ -656,7 +656,7 @@ void avrisp() {
         SERIAL.print("AVR ISP");
         SERIAL.print((char) STK_OK);
       } else {
-        error++;
+        ISPError++;
         SERIAL.print((char) STK_NOSYNC);
       }
       break;
@@ -706,7 +706,7 @@ void avrisp() {
       universal();
       break;
     case 'Q': //0x51
-      error = 0;
+      ISPError = 0;
       end_pmode();
       empty_reply();
       break;
@@ -718,13 +718,13 @@ void avrisp() {
     // expecting a command, not CRC_EOP
     // this is how we can get back in sync
     case CRC_EOP:
-      error++;
+      ISPError++;
       SERIAL.print((char) STK_NOSYNC);
       break;
 
     // anything else we will return STK_UNKNOWN
     default:
-      error++;
+      ISPError++;
       if (CRC_EOP == getch()) {
         SERIAL.print((char)STK_UNKNOWN);
       } else {