SORTES

Software for Real-Time and Embedded Systems
(Master in Computer Science at the KULEUVEN)

The projects are executed on a PIC18F97J60 Microcontroller in combination with the SDCC Compiler.

Installation

Make sure you have the package build essentials installed. To install the necessary compiler and utilities run the install script install.sh located in the install directory.

##Project One: Alarm clock. The first project assignment was the following:

The purpose of this mini-project is to give you the opportunity to design and implement a C program running on a "naked" computer, i. e. without the services of the operating system. In particular, you will have to cope with timer interrupts to know what time it is. You will program an alarm clock on a microcontroller (a small computer-on-a chip) built by the Microchip company. On this micromputer, your programs have directly access to the memory and the peripherals. Its architecture is quite different from a classical PC and you will first have to understand it.

Your alarm clock will have the following features:

1. The alarm clock will display time in the following format hh:mm:ss. The display will thus have to be updated at least once a second.
2. Hours are counted from 0 to 23; the display will thus have to jump from 23:59.59 to 00:00.00
3. The clock time and wake up time must be set when the board is powered up. Ringing is replaced by blinking a led every second during 30 secs.
4. When the clock is running, it will be possible to change the wake up time without influencing the clock; it will also be possible to change the clock time.
5. The yellow led must blink (1/2 second on, 1/2 second off).

Deployment

To build and deploy the clock to the PIC a shell script is available. To run this script the package tftp is required so make sure you have it installed before trying to deploy. The script will make the clock.hex file and start tftp which will wait for input from the user.

$ ./deploy.sh

Enter the following command but do not press return just yet. Reset the PIC and wait for the corresponding LED on the router to light up, then press return.

put clock.hex     

When all of this succeeds, you'll see something like this. The amount of time and bytes may differ.

$ make clock 
#################### BUILD INIT ####################
sdcc -mpic16 -p18f97j60 -L /usr/local/lib/pic16 -llibio18f97j60.lib -llibdev18f97j60.lib -llibc18f.lib -L include objects/clock.o objects/LCDBlocking.o objects/newtime.o
message: using default linker script "/usr/local/share/gputils/lkr/18f97j60.lkr"
#################### BUILD DONE ####################
$ ./deploy.sh 
starting tftp to 192.168.97.6
put clock.hex
tftp> tftp> Sent 35956 bytes in 2.1 seconds