add busywait for fuse program

Attiny85 has tWD_FUSE rated for 4.5ms. Without delay, the fuse program may fail. busyWait does work for fuse program. Verified on logic analyzer.
adafruit · Apr 12, 2021 · 5de3056 · 5de3056
1 parent 988d8ea
commit 5de3056
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/Adafruit_AVRProg.cpp b/Adafruit_AVRProg.cpp
@@ -194,6 +194,7 @@ bool Adafruit_AVRProg::programFuses(const byte *fuses) {
       return false;
     }
   }
+  busyWait();
   f = pgm_read_byte(&fuses[FUSE_LOW]);
   if (f) {
     Serial.print(F("\tSet Low Fuse to: "));
@@ -202,6 +203,7 @@ bool Adafruit_AVRProg::programFuses(const byte *fuses) {
       return false;
     }
   }
+  busyWait();
   f = pgm_read_byte(&fuses[FUSE_HIGH]);
   if (f) {
     Serial.print(F("\tSet High Fuse to: "));
@@ -210,6 +212,7 @@ bool Adafruit_AVRProg::programFuses(const byte *fuses) {
       return false;
     }
   }
+  busyWait();
   f = pgm_read_byte(&fuses[FUSE_EXT]);
   if (f) {
     Serial.print(F("\tSet Ext Fuse to: "));
@@ -218,6 +221,7 @@ bool Adafruit_AVRProg::programFuses(const byte *fuses) {
       return false;
     }
   }
+  busyWait();
   Serial.println();
   endProgramMode();
   return true;