File size: 2,973 Bytes
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*
* $Id: TinyVT52.ino,v 1.1 2022/12/13 19:00:16 stefan Exp stefan $
*
* Stefan's TinyVT52 derived from the IoT BASIC interpreter
*
* See the licence file on
* https://github.com/slviajero/tinybasic for copyright/left.
* (GNU GENERAL PUBLIC LICENSE, Version 3, 29 June 2007)
*
* Author: Stefan Lenz, sl001@serverfabrik.de
*
* Device drivers and low level I/O routines are used from the BASIC code
* These definitions are in basic.h and hardware-arduino.h. These two files
* are exactly identical to the BASIC language files to make sure that further
* work on the device drivers can be used here without changes.
*
* To use the terminal, the hardware definition in hardware-arduino.h need to be set
*
* Any one of the following macros need to be defined
*
* Always set #define DISPLAYCANSCROLL
*
* Displays: define one(!) of the following displays in hardware
* ARDUINOLCDI2C, ARDUINONOKIA51, ARDUINOILI9488, ARDUINOSSD1306
* ARDUINOMCUFRIEND, ARDUINOGRAPHDUMMY, LCDSHIELD, ARDUINOTFT
*
* Keyboards:
* ARDUINOPS2, ARDUINOUSBKBD (alpha!!), ARDUINOZX81KBD
*
* Printers:
* ARDUINOPRT
*
*/
/* which serial port is used for terminal I/O */
#define SERIALPORT Serial
/* which serial port is used for printer IO */
#define PRTSERIAL Serial3
/* the only language feature of BASIC that we need is the VT52 component */
#define HASVT52
/* should the VT52 also handle Wiring */
#define VT52WIRING
/* the device driver code from BASIC */
#include "basic.h"
#include "hardware-arduino.h"
/* XON and XOFF characters */
#define XON 0x11
#define XOFF 0x13
/* a shallow buffer */
#define VT52BUFSIZE 64
char vt52sbuf[VT52BUFSIZE];
int vt52sbi = 0;
void setup() {
/* start the terminal interface */
SERIALPORT.begin(9600);
/* start the display stream */
dspbegin();
/* if a printer port is defined, start the printer, this is Serial1 of Software Serial */
#if defined(ARDUINOPRT)
prtbegin();
#endif
/* if any wire subsystem is requested, start it as well */
#if defined(NEEDSWIRE)
wirebegin();
#endif
/* and then there is SPI */
#if defined(ARDUINOSPI)
spibegin();
#endif
}
void loop() {
char ch;
/* first test, just use the serial port as in */
/* read a chunk of characters */
/* display output is slow, it is an operation at the timescale of 10 ms per character, XOFF while we do it*/
if (SERIALPORT.available()) {
/* send XOFF to hold the output */
SERIALPORT.write(XOFF);
/* free the serial buffer immediately to be ready for characters sent before XOFF could be processes*/
while (SERIALPORT.available() && vt52bi < VT52BUFSIZE) vt52sbuf[vt52bi++]=SERIALPORT.read();
/* now empty the buffer completely */
for (int i=0; i<vt52bi; i++) dspwrite(vt52sbuf[i]);
vt52bi=0;
/* send XON to continue output */
SERIALPORT.write(XON);
}
/* send all characters from the display to the serial stream */
while (kbdavailable()) {
ch=kbdread();
SERIALPORT.write(ch);
}
}
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