F28HS: Hardware-Software Interface

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This page hosts the sample sources from the second part of the course F28HS Hardware/Software Interface, dealing with systems programming on the Raspberry Pi 2. You can find the sample sources for the first half, covered by Lito, on separate pages for C samples and Assembler samples.

A .zip file of all sample sources is available here.

General infrastructure and useful scripts (see Tutorial SysFS ):

Sample sources on Raspberry Pi programming, by week:

• Tutorial 1 (Using Python and LinuxFS for GPIO control):
  • A Python script, to test pin 47 (the on-board, green LED of the RPi2)
  • A bash script, using SysFS to test pin 23
  • A bash script, using SysFS to test any pin specified via -p
• Tutorial 2 (Using an LED as output and a button as input device):
  • tut_led.c C sample code from Tutorial LED
  • tut_led_pin23.c C sample code from Tutorial LED, now controlling an LED wired to pin23
• Tutorial 3:
  • tut_button.c C sample code for a button controlled LED
• Tutorial 4: (programming with signals and in-line assembler)
  • signal2.c re-defining the signal handler for ctrl-c
  • sigint.c using alarm signals and define a signal handler
  • itimer11.c C version of an interval-timer
  • sample0.c simple inline assembler example
  • sample01.c min-max example using inline assembler (with detailed comments)
  • sumav1_asm.c sum-of-pair inline assembler example (and sum-over-array)
  • sumav3_asm.c sum-over-matrix example with inline assembler versions
• Tutorial 5 (Using an LCD display as an output device):
  • lcd-hello.c C sample code from Tutorial LCD
  • lcdBinary.o this binary contains digitalWrite, use it when linking; updated version (check this MD5SUM for the file)
  NB: To run this program, you first need to compile lcd-hello.c and then link it with lcdBinary.o like this:
  

  	  > gcc -w -c -o lcd-hello.o lcd-hello.c
  	  > gcc -o lcd-hello lcd-hello.o lcdBinary.o
  	  > sudo ./lcd-hello
  	

• Tutorial 6 (Using Timers):
  • itimer21.c C and Assembler samples for an interval-timer (use -DASM to compile for assembler)
  • itimer31.c using the RPi2 on-chip timer for a timeout function
• Tutorial 7 (Pure assembler version of LED control):
  • gpio47on.s pure Assembler version of LED on
  • gpio13on_annot.s pure Assembler version of LED on
• Sample sources for the assessed lab in Week 5 (Traffic Lights):
  • Traffic_Lights_core_code.c (controlling 3 LEDs and 1 button; see this lab sheet)
• Revision:
  • Spec for strcpy (see also man 3 strcpy)
  • strcpy in ARM Assembler
  • another version of strcpy with auto-increment addressing in ARM Assembler