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feat(inventory): WL2:D async read (p_ioc + trigger + p_iowait)

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lyrathorpe
2026-07-06 21:56:22 +01:00
parent 2731d22266
commit bf5aa1b231
1 changed files with 27 additions and 17 deletions
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code/inventory/scan.c
+27 -17
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@@ -1,12 +1,11 @@
/* /*
* scan.c - Phase 1: WL2:D scanner, trigger + read loop (reverse-engineered). * scan.c - Phase 1: WL2:D scanner, asynchronous read (reverse-engineered).
* *
* Confirmed from the previous build: opening WL2:D then issuing control ops 6 * Confirmed: opening WL2:D and issuing control ops 6/7 triggers a scan (laser
* and 7 triggers a scan (laser fires, green good-read LED). What was missing was * fires, green LED). Neither synchronous read form returned data, and SCANAPP
* the read: a bare p_iow(chan, P_FREAD, buf) passes no length. This uses p_read * in the ROM uses an async pattern (post read -> P_FREAD -> P_FCANCEL). So this
* (which passes &len) to collect the decoded result, and re-triggers (ops 6/7) * posts an asynchronous read (p_ioc), triggers the scan (ops 6/7), then waits
* each iteration so successive scans work without relying on the scan key. * for completion (p_iowait). Decoded output is CR/LF-terminated.
* Decoded output is CR/LF-terminated (default Symbol2 postamble).
*/ */
#include <plib.h> #include <plib.h>
@@ -17,7 +16,9 @@ GLDEF_C INT main(VOID)
{ {
VOID *chan; VOID *chan;
UBYTE buf[256]; UBYTE buf[256];
INT err, n, i; WORD stat;
UWORD len;
INT err, i;
err = p_open(&chan, "WL2:D", (UINT)-1); err = p_open(&chan, "WL2:D", (UINT)-1);
p_printf("open WL2:D: %d\n", err); p_printf("open WL2:D: %d\n", err);
@@ -27,23 +28,32 @@ GLDEF_C INT main(VOID)
return 1; return 1;
} }
p_printf("Present a barcode under the laser. Reads:\n\n"); p_printf("Present a barcode under the laser. Async reads:\n\n");
for (;;) { for (;;) {
p_iow(chan, WL2_TRIG1); /* trigger a scan */ len = sizeof(buf);
stat = E_FILE_PENDING;
p_ioc(chan, P_FREAD, &stat, buf, &len); /* post async read */
p_iow(chan, WL2_TRIG1); /* trigger the scan */
p_iow(chan, WL2_TRIG2); p_iow(chan, WL2_TRIG2);
n = p_read(chan, buf, sizeof(buf)); /* collect decoded result (with len) */
if (n < 0) { p_iowait(); /* wait for a completion */
p_printf("read %d\n", n);
if (stat == E_FILE_PENDING) { /* our read didn't finish */
p_iow(chan, P_FCANCEL);
p_waitstat(&stat);
continue; continue;
} }
if (n == 0) if (stat < 0) {
p_printf("stat %d\n", stat);
continue; continue;
p_printf("n=%d:", n); }
for (i = 0; i < n && i < 40; i++) p_printf("len=%d:", len);
for (i = 0; i < 40 && i < 256; i++)
p_printf(" %d", buf[i]); p_printf(" %d", buf[i]);
p_printf(" \""); p_printf(" \"");
for (i = 0; i < n && i < 40; i++) for (i = 0; i < 40 && i < 256; i++)
p_putch(buf[i] >= ' ' ? buf[i] : '.'); p_putch(buf[i] >= ' ' ? buf[i] : '.');
p_printf("\"\n"); p_printf("\"\n");
} }