Programming AVR 328p Inside a Arduino With MysmartUSB ISP

If you ever have asked yourself if you can just plug in a ISP SPI Programm onto the ISP Pins on the Arduino Board - here is a test, that should show that it is possible.

1.) Write LED blink Test

2.) Start the toolchain

3.) Program

4.) Be happy with the result

• Arduino UNO Board
• mySmartUSB light
• patiente
• a LED of course without resistance - because we want to see the LED be destroyed
• (By using a resistor to limit the current, the LED will be protected and the microcontroller will function correctly. )
• A PC

write the code into main.c

nano main.c

or with gedit or wathever

It will toglle all Pins on/off

#include <avr/io.h>
#define F_CPU 16000000UL
#include <util/delay.h>

int main(){

DDRB=0xFF; // output for all
while (1){


PORTB = 0xFF;
_delay_ms(250);
PORTB =0x00;
_delay_ms(250);
}
}

Use this makefile.

you need to create a file called "makefile" and add this text inside.

Here are the files:

$ ls
main.c   makefile

The Makefile content:

Variables are defined in the beginning

• PORT: First it defines Variable like the port where the mysmart usb is inside
• MCU: the target architecture! here atmega328p
• CFLAGS/LDFLAGS: Or the compiler flags , and linker flags.
• CC: it also defines which compiler is used: avr-gcc

• avr-gcc or $(CC) followed by flags means that it will use the compiler to create objects files out of the main.c
• avr-objcopy is there to transform the object file into a hex file
• avrdude is there to write the hex file into the atmega!

PORT=/dev/ttyUSB1
MCU=atmega328p
CFLAGS=-g -Wall -mcall-prologues -mmcu=$(MCU) -Os
LDFLAGS=-Wl,-gc-sections -Wl,-relax
CC=avr-gcc
TARGET=main
OBJECT_FILES=main.o

all: $(TARGET).hex

clean:
   rm -f *.o *.hex *.obj *.hex

%.hex: %.obj
   avr-objcopy -R .eeprom -O ihex $< $@

%.obj: $(OBJECT_FILES)
   $(CC) $(CFLAGS) $(OBJECT_FILES) $(LDFLAGS) -o $@

program: $(TARGET).hex
   avrdude -p $(MCU) -c stk500 -P $(PORT) -U flash:w:$(TARGET).hex

• Store the Makefile and run a console and type: make
• What happens is it will run avr-gcc and avr-objcpy

Here are the files:

$ls
main.c   main.hex makefile

• Then type in make program
• And it will run the avrdude

$ make program
avrdude -p atmega328p -c stk500 -P /dev/ttyUSB1 -U flash:w:main.hex

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
        To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "main.hex"
avrdude: input file main.hex auto detected as Intel Hex
avrdude: writing flash (154 bytes):

Writing | ################################################## | 100% 0.07s

avrdude: 154 bytes of flash written
avrdude: verifying flash memory against main.hex:
avrdude: load data flash data from input file main.hex:
avrdude: input file main.hex auto detected as Intel Hex
avrdude: input file main.hex contains 154 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.09s

avrdude: verifying ...
avrdude: 154 bytes of flash verified

avrdude: safemode: Fuses OK (E:FD, H:DE, L:C2)

avrdude done. Thank you.

No just connect the Arduino Uno with the standard USB B cable to check if the LED blinks..

In the video you see that it worked...