lin-epics-modules/sinqS7plcFW
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reads current string length from SPS register

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wall_e
2025-04-17 11:02:47 +02:00
parent 7d4f57750b
commit b3480aa858
1 changed files with 14 additions and 3 deletions
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17
devS7plcFW.c
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@ -2033,7 +2033,11 @@ STATIC long s7plcFWInitRecordStringin(stringinRecord *record)
STATIC long s7plcFWReadStringin(stringinRecord *record) STATIC long s7plcFWReadStringin(stringinRecord *record)
{ {
// The SPS includes the max length of the string and the length of the
// current string, as the first two bytes in the register.
int status; int status;
epicsUInt8 uval8;
S7memPrivate_t *priv = (S7memPrivate_t *)record->dpvt; S7memPrivate_t *priv = (S7memPrivate_t *)record->dpvt;
if (!priv) if (!priv)
@ -2044,11 +2048,18 @@ STATIC long s7plcFWReadStringin(stringinRecord *record)
return -1; return -1;
} }
assert(priv->station); assert(priv->station);
status = s7plcFWRead(priv->station, priv->offs+1,
1, &uval8);
s7plcFWDebugLog(3, "stringin %s: read 8bit %02x\n",
record->name, uval8);
uval8 = uval8 <= priv->dlen ? uval8 : priv->dlen;
memset(record->val, 0, priv->dlen); memset(record->val, 0, priv->dlen);
status = s7plcFWReadArray(priv->station, priv->offs, status = s7plcFWReadArray(priv->station, priv->offs+2,
1, priv->dlen, record->val); 1, uval8, record->val);
s7plcFWDebugLog(3, "stringin %s: read array of %d 8bit values\n", s7plcFWDebugLog(3, "stringin %s: read array of %d 8bit values\n",
record->name, priv->dlen); record->name, uval8);
if (record->val[priv->dlen] && !memchr(record->val, 0, priv->dlen)) if (record->val[priv->dlen] && !memchr(record->val, 0, priv->dlen))
{ {
/* truncate oversize string */ /* truncate oversize string */