Burn fuse for external crystal at 16K CK and 65ms

Makefile

@@ -57,8 +57,8 @@ flash: $(TARGET)
 	$(E) "[AVD] Flashing..."
 	$(Q) $(AVD) -l $(LOGFILE)    \
 	       -c $(ASP) -p $(ARCH)  \
-	       -U lfuse:w:0xff:m     \
+	       -U lfuse:w:0xFF:m     \
-	       -U hfuse:w:0x91:m     \
+	       -U hfuse:w:0xD2:m     \
 	       -U flash:w:$<
 
 .PHONY: clean

src/bus/usart.c

@@ -27,7 +27,7 @@ int USART_Init(void)
 
 	UCSR0B = BIT(RXCIE0); // Handle RXC interrupts
 	UCSR0B |= BIT(RXEN0) | BIT(TXEN0); // Enable RX and TX circuitry
-	UCSR0C = BIT(USBS0) | BIT(UCSZ00) | BIT(UCSZ01); // 8-bit data, 2-bit stop
+	UCSR0C = BIT(UCSZ01) | BIT(UCSZ00); // 8-bit data, 1-bit stop, no parity
 	UBRR0H = (USART_BAUD_PRESCALE >> 8); // Set baud rate upper byte
 	UBRR0L = USART_BAUD_PRESCALE; // Set baud rate lower byte
 

src/main.c

@@ -57,6 +57,16 @@ static int Init(void)
 
 	Info("Initializing...");
 
+	// FIXME: Something is wrong here:
+	// - AVRDUDE sometimes fails to verify flash.
+	// - UART sometimes stops working.
+	// - External crystal problems?
+	// - Power supply problems?
+	// - Wrong fuses? Unlikely.
+	// - Bootloader problems?
+
+	return 0;
+
 	// The watchdog timer is clocked from a separate
 	// on-chip oscillator which runs at 1 MHz. Eight
 	// different clock cycle periods can be selected
@@ -232,10 +242,13 @@ int main(void)
 
 	for (;;) {
 		WDT_Reset();
-		Update();
+		Info("UPDATE");
+		continue;
+		// Update();
 		WDT_Reset();
 		Sleep(1000);
 	}
 
+	UNUSED(Update);
 	return 0;
 }