From: Manfred Steiner <sx@htl-kaindorf.at>
Date: Thu, 15 Aug 2024 14:58:13 +0000 (+0200)
Subject: changes for battery-mode (power via Q1)
X-Git-Url: https://git.htl-mechatronik.at/public/?a=commitdiff_plain;h=refs%2Fheads%2Fw-v1a-gdb-stub;p=nano-x.git

changes for battery-mode (power via Q1)
---

diff --git a/software/bootloader-arduino/Makefile b/software/bootloader-arduino/Makefile
index 6b30abd..00872f0 100644
--- a/software/bootloader-arduino/Makefile
+++ b/software/bootloader-arduino/Makefile
@@ -127,7 +127,11 @@ isp-erase-644p:
  
 isp-fuse-644p:
 	#avrdude -c usbasp -p m644p -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFF:m -U lock:w:0xFF:m
-	avrdude -c usbasp -p m644p -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
+	#avrdude -c usbasp -p m644p -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
+	# LFUSE=0xEE -> startuptime 1K CLOCKS + 0ms -> 83us
+	#avrdude -c usbasp -p m644p -U lfuse:w:0xEE:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
+	# LFUSE=0xE7 -> startuptime 16K CLOCKS + 4.1ms -> 5.4ms
+	avrdude -c usbasp -p m644p -U lfuse:w:0xE7:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
 
 clean:
 	@rm -r dist
diff --git a/software/bootloader-arduino/src/main.c b/software/bootloader-arduino/src/main.c
index 32ccfbd..3ca14b3 100644
--- a/software/bootloader-arduino/src/main.c
+++ b/software/bootloader-arduino/src/main.c
@@ -113,9 +113,10 @@ int main () {
 		asm volatile("nop\n\t");
 	#endif
 
-	// LED ports output and off
-	DDRC = (1 << PC4) | (1 << PC3) |(1 << PC2);
+	// LED ports output and off, ensure that Q1 (battery power) on (PC7)
 	PORTC = 0;
+   DDRC = (1 << PC7) | (1 << PC4) | (1 << PC3) |(1 << PC2);
+	
 
 	#ifdef DOUBLE_SPEED
 		UCSR0A = (1 << U2X0); // Double speed mode USART0