Software for the HC908 hardware test platform
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files for the two latest versions ...
Version 3b -- Supports the DDS-30 card with standalone LCD user interface. .
Version 4a -- Supports both DDS-30 card and DDS-60 card via serial link to PC
"Exerciser" is a simple application that is controlled via the RS-232 serial port and is used to demonstrate use of typical I/O peripherals one might use with the processor. Exerciser provides a set of library routines and drivers for the various hardware components comprising the Digital Breadboard project: LCD, keypad, DDS, A/D Converter, shaft encoder and EEPROM. These library routines are individually selectable from a menu presented sent to the serial port, allowing the user to invoke any of the functions for test purposes. Further, the user may conveniently modify the Exerciser program to serve as the starting point for custom program development.
is located at the “user application” address of 8000 and comes pre-loaded on
all initially-supplied HC908 Daughtercards. (The other pre-loaded software
program is the ‘HCmon’ debug monitor loaded from location E000 to FFFF.)
Exerciser user application is controlled by an external terminal program
connected to the daughtercard’s serial port and serves at least two main
roles. First, it provides the user with a ready-made program that exercises (or
demonstrates) some standard peripheral functions that can be used in a typical
project employing the HC908 Daughtercard. Of course the various peripheral
hardware components must be present and connected to the daughtercard for the
program to work as described, and these peripherals include: an LCD display, a
shaft encoder, a piezo-electric sounding device, a number of discrete LEDs and a
serial port connector.
second role performed by the Exerciser program is that of a daughtercard tester.
Each HC908 Daughtercard made is placed into the a “test
fixture” consisting of the hardware peripherals mentioned above. (Refer to
the Test Fixture schematic). A special connector is wired to specific I/O pins
on the J1 and J2 connectors of the daughtercard, and the HCmon and Exerciser
programs are burned into flash memory on the 68HC908AB32 microcontroller. This
initial “boot strap programming” of the debug monitor program (at least) is
necessary to make the daughtercard intelligent enough to handle subsequent
repeated loadings/burnings of custom programs into its user application memory