56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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* scan.c - Phase 1 barcode diagnostic: software-triggered scan over TTY:D.
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*
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* TTY:D is the top-slot bar code interface. It did not auto-transmit on a scan,
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* so this build uses the documented escape-sequence trigger (I/O Devices
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* Reference, HC Intelligent Bar Code Reader chapter):
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* <Esc>-y1J enable single-read mode
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* <Esc>-y1K "read next scan" - arms the reader for one label
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* After each decoded label (terminated by CR) it re-arms with another K.
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* Every received byte is streamed as a decimal value.
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*
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* <Esc>=0x1b, '-'=0x2d, 'y'=0x79. Escape sequences carry no embedded spaces.
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*/
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#include <plib.h>
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GLDEF_C INT main(VOID)
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{
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VOID *chan;
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UBYTE b;
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INT err, n, c;
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static TEXT cmdJ[5] = { 0x1b, '-', 'y', '1', 'J' }; /* single-read mode on */
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static TEXT cmdK[5] = { 0x1b, '-', 'y', '1', 'K' }; /* trigger one scan */
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err = p_open(&chan, "TTY:D", (UINT)-1);
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p_printf("open TTY:D: %d\n", err);
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if (err < 0) {
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p_printf("Press a key to exit.\n");
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p_getch();
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return 1;
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}
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err = p_write(chan, cmdJ, 5);
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p_printf("single-read mode (Esc-y1J): %d\n", err);
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err = p_write(chan, cmdK, 5);
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p_printf("trigger (Esc-y1K): %d\n", err);
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p_printf("\nPoint at a barcode. Streaming bytes:\n\n");
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for (;;) {
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n = p_read(chan, &b, 1);
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if (n < 0) {
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p_printf("<e%d>", n);
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continue;
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}
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if (n == 0)
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continue;
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c = b;
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p_printf(" %d", c);
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if (c == 13 || c == 10) {
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p_printf(" <EOL>\n");
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p_write(chan, cmdK, 5); /* re-arm for the next scan */
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}
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}
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}
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