Minimal sketch in C with features and Makefile

Author: arteknix

LearningAvrC/Examples/Lesson00/Blink.c

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+/*  ©arteknix : template for avr programming
+    list of includes you might consider
+    tow functions for illustration
+    initLed and toggleLed
+    this sketch needs avr/io.h for pins
+    and util/delay.h for _delay_ms
+    NB: normally you would use interrupt of TIMER overflow.
+    */
+//#include <stdint.h>
+//#include <stdlib.h>
+//#include <stdio.h>
+//#include <avr/interrupt.h>
+#include <avr/io.h>
+//#include <avr/pgmspace.h>
+//#include <inttypes.h>
+#define F_CPU 16000000
+#include <util/delay.h>
+
+#define LED_PIN     PB5     //PIN
+#define LED_PORT    PORTB   //PORT
+#define LED_DDR     DDRB    //IO config
+//======== FUNCTIONS ===================
+void initLed(){
+    LED_DDR  |= _BV(LED_PIN); // LED_PIN as OUTPUT
+}
+void toggleLed(){
+    LED_PORT ^= _BV(LED_PIN); // invert LED_PIN
+}
+//======== MAIN ========================
+int main(void){
+    initLed();
+    while(1){
+        toggleLed();
+	    _delay_ms(300);
+        toggleLed();
+	    _delay_ms(700);
+    }
+    return 0;
+}

LearningAvrC/Examples/Lesson00/Makefile

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+# @arteknix: Atmel AVR: compile - build - upload - list symbols
+# rather complete MAKEFILE for AVR using debian Linux file paths
+MCU 		= atmega328p    #avr-gcc and AVRdude
+PART		= m328p         #AVRdude alternative
+TARGET_ARCH	= -mmcu=$(MCU)
+TARGET 		= blink
+CC		= avr-gcc
+CPPFLAGS	= -mmcu=$(MCU)
+CFLAGS		= -Os -g -Wall -I./includes, -DF_CPU=16000000
+LDFLAGS		= -g -mmcu=$(MCU) -lm -Wl,--gc-sections -Os
+#PRGMER		= -c wiring -b 115200 -P /dev/ttyUSB0
+PRGMER		= -c arduino -b 115200 -P /dev/ttyACM1
+PRGMERISP	= -c avrispv2 -P /dev/ttyUSB0
+#DUDE		= /usr/bin/avrdude -v -V -p $(MCU)
+DUDE		= /usr/bin/avrdude -V -p $(MCU)
+
+C_SRCS		= $(wildcard *.c)
+OBJ_FILES	= $(C_SRCS:.c=.o)
+
+all:		$(TARGET).hex
+
+clean:	
+			rm -f $(TARGET).elf *.o *.hex
+			@echo $@ done
+
+%.o: %.c
+			@echo $@ 
+			@echo $<
+			$(CC) -c $(CPPFLAGS) $(CFLAGS) $< -o $@
+
+$(TARGET).elf: $(OBJ_FILES)
+			$(CC) $(LDFLAGS) -o $@ $(OBJ_FILES)
+
+$(TARGET).hex: $(TARGET).elf
+			avr-objcopy -j .text -j .data -O ihex $(TARGET).elf $(TARGET).hex
+			avr-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+                        --change-section-lma .eeprom=0 -O ihex $(TARGET).elf eeprom.hex
+
+upload: $(TARGET).hex size
+			$(DUDE) $(PRGMER) -i 8 -U flash:w:$(TARGET).hex 
+
+size: $(TARGET).elf
+			avr-size -C --mcu=$(MCU) $(TARGET).elf
+
+sizeofhex: $(TARGET).hex
+			avr-size $(TARGET).hex
+
+symbols: $(TARGET).elf
+			@echo "\n---" headers and symbols for $< "---\n"
+			avr-readelf -hs $(TARGET).elf | less