From 9a240ddaa21efaa333d2d45a73fe2af9f60a1437 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Wed, 27 Apr 2022 13:27:43 +0200
Subject: Minor changes

---
 src/app/Makefile  | 10 ++++------
 src/app/README.md |  5 +++++
 2 files changed, 9 insertions(+), 6 deletions(-)

(limited to 'src/app')

diff --git a/src/app/Makefile b/src/app/Makefile
index 8fe6809..a5f71de 100644
--- a/src/app/Makefile
+++ b/src/app/Makefile
@@ -13,10 +13,8 @@ PROG = dragon_isp
 PART=attiny25
 AVRDUDE_PART=t25
 
-# Cpu frequency
-# is 3.579545MHz / 8 = 447443.125
-#F_CPU=447443UL
-F_CPU="(3579545UL/8)"
+# Cpu frequency, internal RC at 8MHz, divide by 8 enabled
+F_CPU="1000000UL"
 
 # Directory for built objects
 BUILD_DIR=build
@@ -46,7 +44,7 @@ vpath %.elf ./$(BUILD_DIR)
 vpath %.hex ./$(BUILD_DIR)
 
 # GCC flags
-CFLAGS=-g -mmcu=$(PART) -O1 -Wall -Werror -DF_CPU=$(F_CPU)
+CFLAGS=-g -mmcu=$(PART) -Os -Wall -Werror -DF_CPU=$(F_CPU)
 INCLUDES=-I. -I$(LIB_DIR)
 
 
@@ -98,7 +96,7 @@ program: $(APP_HEX)
 	$(AVRDUDE) $(AVRDUDE_FLAGS) -c $(PROG) -P $(AVRDUDE_DEV) -p $(AVRDUDE_PART) -U flash:w:$(BUILD_DIR)/$(APP_HEX) -v
 
 fuse:
-	$(AVRDUDE) $(AVRDUDE_FLAGS) -c $(PROG) -P $(AVRDUDE_DEV) -p $(AVRDUDE_PART) -U lfuse:w:0x60:m -U hfuse:w:0xdc:m -U efuse:w:0xff:m -v
+	$(AVRDUDE) $(AVRDUDE_FLAGS) -c $(PROG) -P $(AVRDUDE_DEV) -p $(AVRDUDE_PART) -U lfuse:w:0x62:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m -v
 
 interactive:
 	$(AVRDUDE) $(AVRDUDE_FLAGS) -c $(PROG) -P $(AVRDUDE_DEV) -p $(AVRDUDE_PART) -t -v
diff --git a/src/app/README.md b/src/app/README.md
index 9683e00..a797ec4 100644
--- a/src/app/README.md
+++ b/src/app/README.md
@@ -8,3 +8,8 @@ On startup, configure ADF4002 with
 
     f_VCO = N ⋅ f_REF / R
     27    = 1080 ⋅ 10 / 400
+
+ATtiny eFuse
+------------
+
+Kept at default 62 DF FF
-- 
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