From cf23c1aa245391e1c531b86386bb216cac72a171 Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周四, 07 11月 2013 22:30:36 +0800
Subject: [PATCH] Resolve bug #10 Multiple commands per package

---
 libscpi/src/ieee488.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/libscpi/src/ieee488.c b/libscpi/src/ieee488.c
index e3f4629..789613b 100644
--- a/libscpi/src/ieee488.c
+++ b/libscpi/src/ieee488.c
@@ -100,11 +100,14 @@
 void SCPI_RegSet(scpi_t * context, scpi_reg_name_t name, scpi_reg_val_t val) {
     bool_t srq = FALSE;
     scpi_reg_val_t mask;
+    scpi_reg_val_t old_val;
 
     if ((name >= SCPI_REG_COUNT) || (context->registers == NULL)) {
         return;
     }
     
+    /* store old register value */
+    old_val = context->registers[name];
 
     /* set register value */
     context->registers[name] = val;
@@ -116,7 +119,10 @@
             mask &= ~STB_SRQ;
             if (val & mask) {
                 val |= STB_SRQ;
-                srq = TRUE;
+                /* avoid sending SRQ if nothing has changed */
+                if (old_val != val) {
+                    srq = TRUE;
+                }
             } else {
                 val &= ~STB_SRQ;
             }
@@ -234,13 +240,20 @@
 
 /**
  * *IDN?
+ * 
+ * field1: MANUFACTURE
+ * field2: MODEL
+ * field4: SUBSYSTEMS REVISIONS
+ * 
+ * example: MANUFACTURE,MODEL,0,01-02-01
  * @param context
  * @return 
  */
 scpi_result_t SCPI_CoreIdnQ(scpi_t * context) {
-    SCPI_ResultString(context, SCPI_MANUFACTURE);
-    SCPI_ResultString(context, SCPI_DEV_NAME);
-    SCPI_ResultString(context, SCPI_DEV_VERSION);
+    SCPI_ResultString(context, context->idn[0]);
+    SCPI_ResultString(context, context->idn[1]);
+    SCPI_ResultString(context, context->idn[2]);
+    SCPI_ResultString(context, context->idn[3]);
     return SCPI_RES_OK;
 }
 

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