?? vs.c
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/* * Screw Works interface via DC-11 */#include "../h/types.h"#include "../h/tty.h"#define VSADDR ((struct device *)0174140)#define CDLEAD 01#define B1200 030#define STOP1 0400#define CLSEND 02#define RQSEND 01#define GO 026#define COUNT 120struct device { int vsrcsr; int vsrbuf; int vsxcsr; int vsxbuf;};struct { struct clist iq; int vtime; struct clist oq;} vs;vsopen(dev){ register c; c = VSADDR->vsrcsr; /* touch register */ VSADDR->vsrcsr = IENABLE|B1200|CDLEAD; VSADDR->vsxcsr = STOP1|IENABLE|B1200; vschar(GO);}vsclose(dev){ vschar(GO); VSADDR->vsrcsr &= ~IENABLE; while (getc(&vs.iq) >= 0);}vswrite(dev){ register int count, c; count = 0; while ((c=cpass()) >= 0) { if (--count <= 0) { count = COUNT; vschar(GO); } vschar(c); } vschar(GO);}vschar(c){ spl5(); while (vs.oq.c_cc > 120) { vsxintr(); sleep((caddr_t)&vs.oq, TTIPRI); } putc(c, &vs.oq); vsxintr(); spl0();}vstimo(){ vs.vtime = 0; vsxintr();}vsxintr(){ static lchar; register c; register int *xcsr; xcsr = &VSADDR->vsxcsr; if (*xcsr&DONE) { if (lchar==GO) { *xcsr &= ~RQSEND; lchar = -1; if (vs.oq.c_cc==0) { wakeup((caddr_t)&vs.oq); return; } } if ((*xcsr&CLSEND) == 0) { *xcsr |= RQSEND; if ((*xcsr&CLSEND) == 0) { if (vs.vtime==0) { vs.vtime++; timeout(vstimo, (caddr_t)0, 60); } return; } } if ((c = getc(&vs.oq)) >= 0) VSADDR->vsxbuf = lchar = c; else *xcsr &= ~RQSEND; if (vs.oq.c_cc <= 15) wakeup((caddr_t)&vs.oq); }}vsread(dev){ register int c; spl5(); while ((c = getc(&vs.iq)) < 0) sleep((caddr_t)&vs.iq, TTIPRI); spl0(); passc("?0*#?546?213?879?"[c&017]);}vsrintr(){ register int c; c = VSADDR->vsrbuf; /* Register must be read (?) */ c = VSADDR->vsrbuf; if (vs.iq.c_cc<=10) putc(c, &vs.iq); wakeup((caddr_t)&vs.iq);}?? 快捷鍵說明
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