Dobrica Pavlinušić's random unstructured stuff
RaspberryPi: Revision 37
Interestring projects
TODO: test them out and write full description on this wiki :-)
- FreeLSS is a laser scanning program for the Raspberry Pi. It allows a Raspberry Pi to function as the core to a complete turn table laser scanning system.
- PWM on the Raspberry pi - done properly (in hardware, stable)
- https://github.com/ali1234/raspi-teletext
- https://github.com/jgarff/rpi_ws281x
OV7670
DHT11/DHT22
- http://www.tortosaforum.com/raspberrypi/dht11driver.htm
- http://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging/overview
BlinkM + i2c
CEC - control your TV
http://www.raspberrypi.org/forum/viewtopic.php?f=35&t=15749
root@raspberrypi:/home/pi# git clone https://github.com/Pulse-Eight/libcec.git root@raspberrypi:/home/pi# cd libcec/ root@raspberrypi:/home/pi/libcec# apt-get install autoconf automake libtool liblockdev1-dev libudev-dev libraspberrypi-dev root@raspberrypi:/home/pi/libcec# sh -x bootstrap root@raspberrypi:/home/pi/libcec# ./configure --with-rpi-include-path=/opt/vc/include/ --with-rpi-lib-path=/opt/vc/lib/ ############################################################################## libCEC version 2:1:0 configured Compilation flags: CXXFLAGS : -g -O2 -fPIC -Wall -Wextra -Wno-missing-field-initializers -Wno-psabi libCEC LDFLAGS : -lbcm_host -llockdev -lrt -ldl -lpthread -L/opt/vc/lib/ -lvcos -lvchiq_arm -ludev client LDFLAGS : -lrt -ldl -lpthread Configured features: Pulse-Eight CEC Adapter : yes Pulse-Eight CEC Adapter detection : yes Raspberry Pi support : yes TDA995x support : no You can now build libCEC by running: make ############################################################################## make install
TV on
pi@raspberrypi ~ $ echo "on 0" | cec-client -s
Hints from forum
screen saver
http://www.raspberrypi.org/phpBB3/viewtopic.php?p=84831#p84831
# prevent screensaver from powering down display setterm -blank 0 -powerdown 0 > /dev/tty0 # clear the display and turn off the flashing cursor clear > /dev/tty0 setterm -cursor 0 > /dev/tty0 # turn the cursor back on when done with omxplayer setterm -cursor 1 > /dev/tty0
YouTube transcoding in VLC
http://www.raspberrypi.org/phpBB3/viewtopic.php?p=163658#p163658
cvlc 'youtube.com/watch?v=XXXXXXXXXX' :sout='#transcode{vcodec=h264,vb=0,fps=0,scale=0,height=720,acodec=mp4a,ab=128,channels=2,samplerate=44100}:http{mux=ffmpeg{mux=flv},dst=:8080/youtube}' :sout-keep
Education materials
- http://pi.cs.man.ac.uk/download/Raspberry_Pi_Education_Manual.pdf
- http://www.ocr.org.uk/qualifications/by-subject/computing/raspberry-pi/
- http://www.cl.cam.ac.uk/projects/raspberrypi/
Raspberry Pi Accessories Starter Kit
http://www.conrad.com/ce/en/product/409208/Raspberry-Pi-Accessories-Starter-Kit?ref=searchDetail
- 1x Rapberry sticker
- Power supply for the Raspberry
- Sturdy acrylic housing, which includes all possible connections for this Raspberry and perfectly protects
- 4 GB SD card to store your programs
- USB Micro Card Reader
- USB cable (for power supply or the power supply of a PC)
- 3 m Ethernet cable
- https://learn.adafruit.com/adafruits-raspberry-pi-lesson-6-using-ssh
- https://learn.adafruit.com/adafruit-raspberry-pi-lesson-7-remote-control-with-vnc
- TTL USB cable
- PI Cobbler (KIT hereby connect the RP with other circuit boards)
- Large breadboard circuit
- Colored board cable connector
- 5x 560 ohm resistors (for LEDS)
- 3x LED's (red, green, blue)
- https://learn.adafruit.com/raspberry-pi-e-mail-notifier-using-leds
- https://learn.adafruit.com/debugging-with-the-raspberry-pi-webide/debug-a-blinking-led
- 5x 10K resistors (for buttons)
- 3x pushbutton
- 1x photocell
- 1x 1uf capacitor (for photocell)
GPU
- FFT
- http://www.raspberrypi.org/accelerating-fourier-transforms-using-the-gpu/
- https://github.com/raspberrypi/userland/tree/master/host_applications/linux/apps/hello_pi/hello_fft/qasm
- SHA-256
- Machine learning - the Deep Belief image recognition SDK
Arduino
- Connect using I2C http://www.pihomeserver.fr/en/2013/08/13/raspberry-pi-home-server-arduino-lier-les-deux-via-bus-i2c/
JTAG
Arduino ProMini 3.3V 8MHz
Disable serial port console
edit /boot/cmdline.txt and remove all ttyAMA0 leaving:
pi@raspberrypi ~ $ cat /boot/cmdline.txt dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait bcm2708.w1_gpio_pin=4
also, comment out ttyAMA0 in /etc/inittab
connect Arduino serial
RX->TX
TX->RX
https://github.com/dpavlin/avrdude-rpi/tree/fix_channel_in_use
pin definitions in GPIO.RPi are physical pins on board not BCM or wiring ip!
flasing
dpavlin@blue:~/Arduino/RF433_Sockets$ scp /tmp/build*.tmp/*.hex pi@rpi.tv:/tmp/
RF433_Sockets.cpp.hex 100% 19KB 18.6KB/s 00:00
pi@raspberrypi ~ $ cat avrdude.sh
#!/bin/sh
hex=`ls -t /tmp/*.hex | head -1`
echo "flash hex: $hex"
sudo /home/pi/avrdude-rpi/avrdude-autoreset -C /home/pi/avrdude.conf -v -v -patmega328p -carduino -P/dev/ttyAMA0 -b57600 -D -Uflash:w:$hex:i
pi@raspberrypi ~ $ ./avrdude.sh
flash hex: /tmp/RF433_Sockets.cpp.hex
avrdude: Version 6.1, compiled on Sep 17 2014 at 05:41:35
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "/home/pi/avrdude.conf"
User configuration file is "/root/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : /dev/ttyAMA0
Using Programmer : arduino
Overriding Baud Rate : 57600
done with autoreset
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
AVR Part : ATmega328P
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PC2
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff
flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
Programmer Type : Arduino
Description : Arduino
Hardware Version: 2
Firmware Version: 1.16
Vtarget : 0.0 V
Varef : 0.0 V
Oscillator : Off
SCK period : 0.1 us
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.01s
avrdude: Device signature = 0x1e950f
avrdude: safemode: lfuse reads as 0
avrdude: safemode: hfuse reads as 0
avrdude: safemode: efuse reads as 0
avrdude: reading input file "/tmp/RF433_Sockets.cpp.hex"
avrdude: writing flash (6770 bytes):
Writing | ################################################## | 100% 1.98s
avrdude: 6770 bytes of flash written
avrdude: verifying flash memory against /tmp/RF433_Sockets.cpp.hex:
avrdude: load data flash data from input file /tmp/RF433_Sockets.cpp.hex:
avrdude: input file /tmp/RF433_Sockets.cpp.hex contains 6770 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 1.49s
avrdude: verifying ...
avrdude: 6770 bytes of flash verified
avrdude: safemode: lfuse reads as 0
avrdude: safemode: hfuse reads as 0
avrdude: safemode: efuse reads as 0
avrdude: safemode: Fuses OK (E:00, H:00, L:00)
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
avrdude done. Thank you.
strace: |/home/pi/avrdude-rpi/autoreset: Broken pipe
DS1307 Tiny RTC
- http://www.instructables.com/id/Set-up-Real-Time-Clock-RTC-on-Raspberry-Pi/
- http://electronics.stackexchange.com/questions/98361/how-to-modify-ds1307-rtc-to-use-3-3v-for-raspberry-pi
Check if module has 5V pull-up I2C resistors! If it does (like Tiny RTC has R2 and R3) you will have to remove them.
root@raspberrypi:/home/pi# apt-get install i2c-tools
root@raspberrypi:/home/pi# modprobe i2c-dev
root@raspberrypi:/home/pi# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@raspberrypi:/home/pi# modprobe rtc-ds1307
root@raspberrypi:/home/pi# echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
root@raspberrypi:/home/pi# hwclock --systohc -D --noadjfile --utc
hwclock from util-linux 2.20.1
Using /dev interface to clock.
Assuming hardware clock is kept in UTC time.
Time elapsed since reference time has been 0.722720 seconds.
Delaying further to reach the new time.
Setting Hardware Clock to 11:53:41 = 1429876421 seconds since 1969
ioctl(RTC_SET_TIME) was successful.
DS18B20
root@raspberrypi:/home/pi# grep w1 /boot/config.txt dtoverlay=w1-gpio # reboot root@raspberrypi:/home/pi# cat /sys/bus/w1/devices/28-0000043c5507/w1_slave 50 05 4b 46 7f ff 0c 10 1c : crc=1c YES 50 05 4b 46 7f ff 0c 10 1c t=85000
Hmm, you will also want to remove R1 pullup to make it work?
avrdude
Using Raspberry Pi as Arduino ISP programmer
root@raspberrypi:/home/pi# avrdude -c linuxgpio -p atmega328p avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.00s avrdude: Device signature = 0x1e950f avrdude: safemode: Fuses OK (E:05, H:DA, L:FF) avrdude done. Thank you.
logic analyzer
- bare metal: https://github.com/tuxyme/metal-pi
- Panalyzer - a RaspberryPi based Logic Analyzer https://github.com/richardghirst/Panalyzer
