/* | |
* | |
* $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, [email protected] | |
* | |
* 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 */ | |
/* which serial port is used for printer IO */ | |
/* the only language feature of BASIC that we need is the VT52 component */ | |
/* should the VT52 also handle Wiring */ | |
/* the device driver code from BASIC */ | |
/* XON and XOFF characters */ | |
/* a shallow buffer */ | |
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 */ | |
prtbegin(); | |
/* if any wire subsystem is requested, start it as well */ | |
wirebegin(); | |
/* and then there is SPI */ | |
spibegin(); | |
} | |
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); | |
} | |
} | |