TI HEX-BUS SD Drive Interface Copyright (C) 2017-20 Jim Brain
Coupled with an Atmel ATMEGA328 microcontroller (either as a standalone PCB or an Arduino UNO, Nano, etc. development board), this firmware implements the functionality of the various HEXBUS peripherals:
- Secure Digital (SD) based random access disk drive at device # 100
- RS232 port at device # 20
- RS232-based printer port at device #10
- RTC-based clock at device 230
Configure the Arduino IDE for the specific board in use. Adjust pin mappings in config.h if the board does not use Arduino UNO mappings. Once configured, load the src.ino file in the src directory, compile and download the object code to the Arduino system.
Because the GCC C++ compiler and Arduino IDE settings compile the code slightly differently, the resulting code size is larger and thus not all features can be enabled. By default, only the driver function is enabled in the Arduino build. You can optionally enable some of the other peripherals by uncommenting lines in config.h:
#elif CONFIG_HARDWARE_VARIANT == 4
/* ---------- Hardware configuration: Old HEXTIr Arduino ---------- */
#define INCLUDE_DRIVE
//#define INCLUDE_CLOCK
//#define INCLUDE_SERIAL
//#define INCLUDE_PRINTER
The code has been successfully compiled using Arduino IDE 1.8.19 and 2.0.3.
The best code size is obtained by compiling the code natively via the AVR-GCC toolchain.
To use the PCB design in the PCB directory, run the following make command:
make CONFIG=config clean all fuses program
To use an Arduino UNO with a SD Card shield, run the following make command:
make CONFIG=config-arduino clean all fuses program
You may need to adjust the avrdude settings in the respecive config files in the main directory.
Native and Arduino builds differ only in the pin mappings. All features are enabled in both builds. If space becomes an issue, you can comment out specific peripherals in config.h:
#define INCLUDE_DRIVE
#define INCLUDE_CLOCK
#define INCLUDE_SERIAL
#define INCLUDE_PRINTER
This project's PCB files are free designs; you can redistribute them and/or modify them under the terms of the Creative Commons Attribution-ShareAlike 4.0 International License.
You should have received a copy of the license along with this work. If not, see http://creativecommons.org/licenses/by-sa/4.0/.
These files are distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the license for more details.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License only.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA