pb66 / avrdude-rpi

Fixing the lack of a DTR pin on the Raspberry Pi for the purposes of uploading hex files to the arduino

Using avrdude with the Raspberry Pi

Since the Raspberry Pi lacks a DTR pin that makes it oh-so-easy to upload your hex files into the avr, we need this hack to make it just as easy. When you wire up your atmega chip, be sure to connect one of the digital gpio pins to the reset pin, and then you'll be able to use avrdude as if your serial cable actually had a dtr pin.

Instructions:

Clone the repo to the users homedir, rename the original avrdude to avrdude-original, symlink the autoreset files from your /usr/bin directory and symlink avrdude-autoreset to become avrdude.

git clone https://github.com/pb66/avrdude-rpi.git ~/avrdude-rpi
sudo mv /usr/bin/avrdude /usr/bin/avrdude-original
sudo ln ~/avrdude-rpi/autoreset /usr/bin
sudo ln ~/avrdude-rpi/avrdude-autoreset /usr/bin
sudo ln -s /usr/bin/avrdude-autoreset /usr/bin/avrdude

Modify the autoreset script to use the pin that you wired up to the reset pin. See the line in autoreset where we do "pin = 4" and change the 4 to your gpio pin number. (RFM2Pi boards use gpio 4)

Now when you run avrdude from anywhere (including via arduino's normal UI) it will flag dtr when it is about to upload hex data.

http://www.deanmao.com/2012/08/12/fixing-the-dtr-pin/

Make sure Python is installed

sudo apt-get update
sudo apt-get install python-dev python-rpi.gpio

####Arduino IDE

If using with Arduino IDE on Raspberry Pi a symlink is also required to /dev/ttyAMA0 from the IDE's default target serial port of /dev/ttyS0 (on Linux). This symlink will need to be recreated at each boot so a line should added to the rc.local file

sudo nano /etc/rc.local

and at the end of that file just before the "exit 0" line add the line

sudo ln -s /dev/ttyAMA0 /dev/ttyS0

####RFM2Pi requirements

If using the Arduino IDE rather than avrdude from command line there needs to be an additional board type set up.

sudo nano /usr/share/arduino/hardware/arduino/boards.txt

and insert the following section of text (probally nearer to the top for a higher menu position in IDE)

#############################################################

atmega328_384_8.name=RFM2Pi v2 (ATmega328 int 8MHz)

atmega328_384_8.upload.protocol=arduino
atmega328_384_8.upload.maximum_size=30720
atmega328_384_8.upload.speed=38400

atmega328_384_8.bootloader.low_fuses=0xE2
atmega328_384_8.bootloader.high_fuses=0xDE
atmega328_384_8.bootloader.extended_fuses=0x05
atmega328_384_8.bootloader.path=optiboot
atmega328_384_8.bootloader.file=optiboot_atmega328_384_8.hex
atmega328_384_8.bootloader.unlock_bits=0x3F
atmega328_384_8.bootloader.lock_bits=0x0F

atmega328_384_8.build.mcu=atmega328p
atmega328_384_8.build.f_cpu=8000000L
atmega328_384_8.build.core=arduino
atmega328_384_8.build.variant=standard

For the bootloader files edit Makefile in the optiboot folder

sudo nano /usr/share/arduino/hardware/arduino/bootloaders/optiboot/Makefile

and insert these lines below the standard "atmega328" section

# Standard atmega328, only at 38,400 baud for closer clock accuracy AND using 8Mhz internal RC oscillator
#
atmega328_384_8: TARGET = atmega328
atmega328_384_8: MCU_TARGET = atmega328p
atmega328_384_8: CFLAGS += '-DLED_START_FLASHES=3' '-DBAUD_RATE=38400'
atmega328_384_8: AVR_FREQ = 8000000L
atmega328_384_8: LDSECTIONS  = -Wl,--section-start=.text=0x7e00 -Wl,--section-start=.version=0x7ffe
atmega328_384_8: $(PROGRAM)_atmega328_384_8.hex
atmega328_384_8: $(PROGRAM)_atmega328_384_8.lst

atmega328_384_8_isp: atmega328
atmega328_384_8_isp: TARGET = atmega328
atmega328_384_8_isp: MCU_TARGET = atmega328p
# 512 byte boot, SPIEN
atmega328_384_8_isp: HFUSE = DE
# Int. RC Osc. 8MHz, slowly rising power-65ms
atmega328_384_8_isp: LFUSE = E2
# 2.7V brownout
atmega328_384_8_isp: EFUSE = 05
atmega328_384_8_isp: isp

Save the file and then "make" the additional files using

cd /usr/share/arduino/hardware/arduino/bootloaders/optiboot
sudo make atmega328_384_8
cd -

http://forum.arduino.cc/index.php?topic=124879.0

###More info

OEM forum discussion

RFM2Pi v2 Wiki

RFM2Pi software repo

RFM2Pi hardware repo

avrdude-rpi's Issues

Setting pin number for reset

deanmao#3