+terminal

[lptgpib.git] / terminal.c

diff --git a/terminal.c b/terminal.c
new file mode 100644 (file)
index 0000000..5de10a8
--- /dev/null
+++ b/terminal.c
@@ -0,0 +1,45 @@
+#include "lptgpib.h"
+#include <stdio.h>
+#include <string.h>
+#include <poll.h>
+#include <unistd.h>
+#include <assert.h>
+#include <sys/io.h>
+
+// lptgpib.c
+#define get_control() (inb(lpt_base+2) ^ 0x04)
+#define put_control(x) outb((x) ^ 0x04, lpt_base+2)
+#define TRI 0x20 /* tristate data lines */
+#define NDAC 0x04 /* LPT pin 16 */
+#define DAV  0x01 /* LPT pin 1  */
+
+extern int lpt_base;
+
+int main(int argc,char **argv) {
+  lptgpib_init(0x378);
+  for (;;) {
+    put_control(TRI | NDAC);   /* clear NRFD */
+    if (get_control()&DAV) {   /* wait for DAV */
+      fprintf(stderr,"ctu znak...\n");
+      char flags,val=lptgpib_read_byte(&flags);
+      if (flags&ATN)
+       lptgpib_print_command(val);
+      else
+       fprintf(stderr,"precten znak: %02x (%c)\n",val,val);
+    }
+    struct pollfd pollfd;
+    memset(&pollfd,0,sizeof pollfd);
+    pollfd.fd=0;
+    pollfd.events=POLLIN;
+    int i=poll(&pollfd,1,0);
+    assert(i==0||i==1);
+    if (i==1) {
+      char val;
+      i=read(0,&val,1);
+      assert(i==1);
+      fprintf(stderr,"zapisuji znak... %02x (%c)\n",val,val);
+      lptgpib_write_byte(val,0);
+      fprintf(stderr,"zapsan znak.\n");
+    }
+  }
+}