[pdp11-modern-c] / pdp11 / pdp11.c

/* (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com>   */
/* See LICENSE.txt file for copyright and license details.     */

#include <stdint.h>

/*
 * Polled console I/O
 */

#define RCSR (*((volatile uint16_t *)0177560))
#define RBUF (*((volatile uint16_t *)0177562))
#define XCSR (*((volatile uint16_t *)0177564))
#define XBUF (*((volatile uint16_t *)0177566))

void
putch(uint16_t c)
{
    while((XCSR && 0200) == 0) continue;
    XBUF = c;
}

uint16_t
getch(void)
{
    while((RCSR && 0200) == 0) continue;
    return RBUF;
}

/*
 * Busy-loop
 */

void
wait(uint16_t count)
{
    while (count--) continue;
}
Commit	Line	Data
846f4d60 AT	1	/* (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com> */
	2	/* See LICENSE.txt file for copyright and license details. */
	3
	4	#include <stdint.h>
	5
	6	/*
	7	* Polled console I/O
	8	*/
	9
	10	#define RCSR (((volatile uint16_t )0177560))
	11	#define RBUF (((volatile uint16_t )0177562))
	12	#define XCSR (((volatile uint16_t )0177564))
	13	#define XBUF (((volatile uint16_t )0177566))
	14
	15	void
	16	putch(uint16_t c)
	17	{
	18	while((XCSR && 0200) == 0) continue;
	19	XBUF = c;
	20	}
	21
	22	uint16_t
	23	getch(void)
	24	{
	25	while((RCSR && 0200) == 0) continue;
	26	return RBUF;
	27	}
	28
	29	/*
	30	* Busy-loop
	31	*/
	32
	33	void
	34	wait(uint16_t count)
	35	{
	36	while (count--) continue;
	37	}