From 27321e05de35b494c2b282652e1c40a18435b68b Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Fri, 4 Jun 2021 19:09:07 +0200
Subject: implement uart

---
 Makefile | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 38f5292..386814d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,18 @@
 MCU             = atmega8
-CPUFREQ         = 160000000
 PROGRAMMER      = dragon_isp
 
+CPUFREQ         = 8000000 #8MHz
+BAUD            = 9600
+
+# https://www.engbedded.com/fusecalc/
+# Int. RC Osc. 8MHz
+# No WD
+# No BOD
+LFUSE           = 0xc4
+HFUSE           = 0xd9
+
 CC              = avr-gcc
-CFLAGS          = -std=c89 -Wall -mmcu=$(MCU) -DF_CPU=$(CPUFREQ)
+CFLAGS          = -std=c89 -Wall -mmcu=$(MCU) -DF_CPU=$(CPUFREQ) -DBAUD=$(BAUD)
 LDFLAGS         = -mmcu=$(MCU)
 BUILDDIR        = build
 SOURCEDIR       = src
@@ -19,6 +28,7 @@ build: dir $(OBJ)
 	@echo LD $(OBJ)
 	@$(CC) $(CFLAGS) -o $(BUILDDIR)/$(OUTPUT) $(OBJ) $(LDFLAGS)
 	@avr-objcopy -O ihex $(BUILDDIR)/$(OUTPUT) $(BUILDDIR)/$(OUTPUT).hex
+	@avr-size --mcu=$(MCU) --format=avr $(BUILDDIR)/$(OUTPUT)
 
 debug: -D _DEBUG
 debug: build;
@@ -41,7 +51,10 @@ clean:
 all: clean build
 
 flash: build
-	@avrdude -p $(MCU) -c $(PROGRAMMER) -U flash:w:$(BUILDDIR)/$(OUTPUT).hex:i
+	@sudo avrdude -p $(MCU) -c $(PROGRAMMER) -U flash:w:$(BUILDDIR)/$(OUTPUT).hex:i
+
+fuse:
+	@sudo avrdude -p $(MCU) -c $(PROGRAMMER) -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m
 
 devsetup:
 	@echo "--target=avr -isystem /usr/avr/include/ $(CFLAGS)" | tr ' ' '\n' > compile_flags.txt
-- 
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