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-==== Raspberry Pi links==== 
  
-[[http://www.homautomation.org/2013/09/21/433mhtz-rf-communication-between-arduino-and-raspberry-pi/]]433 send from arduino to pi 
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-[[http://www.petervis.com/Raspberry_PI/Raspberry_Pi_GPIO_Header/Raspberry_Pi_GPIO_Header_Pin_Protection.html]]protect gpio with diode 
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-[[http://www.mosaic-industries.com/embedded-systems/microcontroller-projects/raspberry-pi/gpio-pin-electrical-specifications]]GPIO specs 
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-[[http://www.raspberrypi.org/phpBB3/viewtopic.php?t=22093]]www.raspberrypi.org 
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-==== Assembler ==== 
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-[[http://www.state-machine.com/arm/Building_bare-metal_ARM_with_GNU.pdf]] more assembler  
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-[[http://www.fourtheye.org/armasm.shtml]] these beginners assembly examples work in the window Pi emulator from here:- 
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-[[http://www.computeractive.co.uk/ca/download-review/2193699/download-raspberry-pi-emulation-for-windows]] windows qemu image 
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-[[http://wolfpaulus.com/journal/embedded/raspberrypi_boot]] blinky 
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-Blink OK LED: x3  
-[[http://www.raspberrypi.org/phpBB3//viewtopic.php?p=136266#p136266]] 
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-[[http://pypi.python.org/pypi/RPi.GPIO]] 
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-[[http://devrandom.eu/?p=37]] 
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-[[http://hertaville.com/2012/09/28/development-environment-raspberry-pi-cross-compiler/]] pi cross compiling with eclipse 
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-[[http://www.raspberrypi.org/phpBB3/viewtopic.php?f=72&t=26136&sid=5bacb99a1d1b5fb28705377bd15d2a8e]] pi bare metal forum 
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-[[http://www.cl.cam.ac.uk/freshers/raspberrypi/tutorials/os/]] Assembler course for beginners Cambridge university 
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-[[http://raspberrypi.stackexchange.com/questions/2099/cambridge-university-raspberry-pi-operating-system-development-guide-questions]] more gpio addressing 
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-[[http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf]] circuit diagram 
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-[[http://hertaville.com/2012/11/18/introduction-to-accessing-the-raspberry-pis-gpio-in-c/]] raw gpio access 
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-[[http://www.open.com.au/mikem/bcm2835/bcm2835_8h_source.html]] gpio addesses 
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-[[http://www.raspberrypi-spy.co.uk/2012/06/simple-guide-to-the-rpi-gpio-header-and-pins/]]  
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-$ as  hello.asm # this will produce hello.o ELF object file 
-$ ld -s -o hello a.out # this will produce hello executable 
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-[[http://elinux.org/RPi_Low-level_peripherals]] gpio access in c 
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-==== RiscOS for Pi ==== 
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-[[http://www.apdl.co.uk/riscworld/volume9/issue2/firstbasic/chap04.htm]] 
-beginning basic 
-[[why risc os is better on pi]] 
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-Linux is preemptive. you can't get round that, you're stuck with it stealing time. RISC OS is cooperative. If you want to take control, you can, just by not calling Wimp_Poll. Until you do, the Pi is yours. 
-Of course if you have something else running, that won't get serviced until you do, but that's your decision, not the OS's 
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-[[http://www.raspberrypi.org/phpBB3/viewtopic.php?f=55&t=21648]] 
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-[[https://www.riscosopen.org/forum/forums/4/topics/1437]]www.riscosopen.org/forum 
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-[[http://www.svrsig.org/Beta.htm]] Manuals for RISC OS PI 
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-[[http://foundation.riscos.com/Private/manuals/BASIC/]] risc basic manual pdf 
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-[[http://www.brucesmith.info/page14.html]]risc os pi assembler book 
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-[[http://www.riscosopen.org/news/articles/2012/11/05/official-release-of-risc-os-for-raspberry-pi-updated]] risc site pi image 
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-[[http://downloads.raspberrypi.org/download.php?file=/images/riscos/riscos-2012-11-01-RC6/riscos-2012-11-01-RC6.zip]] Risc OS for pi