ECE471/571 (RTOS) Silicon Labs 8051 Examples - Part 1: Setup, UART, Timers and Digital IO

Documentation, data sheets, etc.

• Processor: C8051F12x-13x.pdf
• Board: C8051F12x-DK.pdf
• Extension: Ethernet-DK.pdf
• Manufacturer: C8051F12x DK
• Tool Chain Integration options for SDCC for small memory model (which is default)
  • Toolchain: SDCC 3.x
  • options for assembler: -plosgff
  • options for compiler: --use-stdout -V --debug --xram-size 8448 -c
  • options for linker: --use-stdout -V --debug --xram-size 8448
  • note: When using SDCC 3.4.x or later add .omf to the name of the compiled file in project options

Examples discussed in class

Examples are added as course progresses. Examples might be improved or expanded after the lecture to reflect outcomes of in class discussion. Actual examples discussed in class may be slightly different. Some examples may require editing compiler locations in configuration files in order to run on your computer.

• Very minimal Blinky demo program
• Blinky demo program with minimal HAL
• Blinky demo program with optimized HAL (C99)
• Minimum project template at 75% CPU speed
• Minimum project template at external oscillator speed
• Project template with serial port console
• Project template with serial port console - Keil C syntax
• Investigating character receiving and string edit with echo
• Using getchar without sending characters back - no echo
• Investigating sending printable characters
• Modifying Flash memory and accessing scratch pad
• Detecting the reasons of the most recent RESET
• Demonstration of ASCII/numbers conversion
• Demonstration of parsing compound ASCII data
• Demonstration of one time waiting on a timer
• Demonstration of scheduling a short repetitive task using a timer and communicating with it from the main program loop
• Timer controlling speed of the main program loop execution using semaphore design pattern
• Main program loop with watchdog timer
• Main program loop with watchdog timer and sleep in-between
• Time-based sequence triggered by a button and synchronized using a semaphore
• Demonstration of non-reentrant arithmetic operations
• Optimize for maintainability, but what is the cost?
• Are floating point computations really that bad?
• PWM generator based on a timer and timer interrupt - simple
• PWM generator above - with short and long button press detection
• PWM generator above - with inactivity kill switch
• PWM generator above - controlled by one byte binary UART input
• PWM generator above - controlled by ASCII UART input
• PWM generator based on a timer and timer interrupt - with variable frequency
• 6 Channel PWM generator based on a PCA and PCA interrupt - with user menu
• 6 Channel PWM generator based on a PCA and PCA interrupt with 16-bit sfr (unsafe) operations
• 6 Channel variable frequency square wave generator based on a PCA and PCA interrupt
• 6 Channel PWM generator based on a PCA and direct output to pins
• Square waveform period measurement using a PCA channel and input from a digital port pin