Add bootloader present check

avr/libraries/Optiboot_flasher/examples/Flash_iterate/Flash_iterate.ino

@@ -72,6 +72,12 @@ void setup()
   delay(2000);
   Serial.begin(9600);
 
+  if(!flash.check_writable())
+  {
+    Serial.println(F("Incompatible or no bootloader present! Please burn correct bootloader"));
+    while(1);
+  }
+
   // If the allocated flash space is above 64kiB, a 16-bit pointer won't be enough anymore.
   // As a workaround, you can set the address to the allocated space like this, and the
   // library will handle the rest. You'll also have to allocate your flash space in

avr/libraries/Optiboot_flasher/examples/Flash_put_get/Flash_put_get.ino

@@ -106,6 +106,12 @@ void setup()
   delay(2000);
   Serial.begin(9600);
 
+  if(!flash.check_writable())
+  {
+    Serial.println(F("Incompatible or no bootloader present! Please burn correct bootloader"));
+    while(1);
+  }
+
   // If the allocated flash space is above 64kiB, a 16-bit pointer won't be enough anymore.
   // As a workaround, you can set the address to the allocated space like this, and the
   // library will handle the rest. You'll also have to allocate your flash space in

avr/libraries/Optiboot_flasher/examples/Read_write_without_buffer/Read_write_without_buffer.ino

@@ -88,6 +88,12 @@ void setup()
   delay(2000);
   Serial.begin(9600);
 
+  if(!optiboot_check_writable())
+  {
+    Serial.println(F("Incompatible or no bootloader present! Please burn correct bootloader"));
+    while(1);
+  }
+
   static uint16_t addr = 0;
 
   Serial.print(F("Filling up flash page 0 with 16-bit values...\n"));

avr/libraries/Optiboot_flasher/examples/Serial_read_write/Serial_read_write.ino

@@ -51,6 +51,12 @@ void setup()
 {
   // Initialize serial
   Serial.begin(9600);
+
+  if(!optiboot_check_writable())
+  {
+    Serial.println(F("Incompatible or no bootloader present! Please burn correct bootloader"));
+    while(1);
+  }
 }
 
 

avr/libraries/Optiboot_flasher/keywords.txt

@@ -27,6 +27,7 @@ put	KEYWORD2
 
 # Optiboot
 do_spm_cli	KEYWORD2
+optiboot_check_writable	KEYWORD2
 optiboot_page_erase	KEYWORD2
 optiboot_page_fill	KEYWORD2
 optiboot_page_write	KEYWORD2