From 06ca0ab8991fe36731ae715a072fb12cc22abcca Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周一, 24 6月 2013 22:19:34 +0800
Subject: [PATCH] Update documentation

---
 libscpi/src/ieee488.c |   40 +++++++++++++++++++++++-----------------
 1 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/libscpi/src/ieee488.c b/libscpi/src/ieee488.c
index 6b4e62e..5fd7fe9 100644
--- a/libscpi/src/ieee488.c
+++ b/libscpi/src/ieee488.c
@@ -84,7 +84,7 @@
  * @param ctrl number of controll message
  * @param value value of related register
  */
-static size_t writeControl(scpi_t * context, int ctrl, scpi_reg_val_t val) {
+static size_t writeControl(scpi_t * context, scpi_ctrl_name_t ctrl, scpi_reg_val_t val) {
     if (context && context->interface && context->interface->control) {
         return context->interface->control(context, ctrl, val);
     } else {
@@ -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;
             }
@@ -145,11 +151,11 @@
             
             
         case SCPI_REG_COUNT:
-            // nothing to do
+            /* nothing to do */
             break;
     }
 
-    // set updated register value
+    /* set updated register value */
     context->registers[name] = val;
 
     if (srq) {
@@ -180,7 +186,7 @@
  * @param context
  */
 void SCPI_EventClear(scpi_t * context) {
-    // TODO
+    /* TODO */
     SCPI_RegSet(context, SCPI_REG_ESR, 0);
 }
 
@@ -204,9 +210,9 @@
  * @return 
  */
 scpi_result_t SCPI_CoreEse(scpi_t * context) {
-    int32_t new_ESE;
-    if (SCPI_ParamInt(context, &new_ESE, TRUE)) {
-        SCPI_RegSet(context, SCPI_REG_ESE, new_ESE);
+    scpi_parameter_t parameter;
+    if (SCPI_Parameter(context, &parameter, TRUE)) {
+        SCPI_RegSet(context, SCPI_REG_ESE, SCPI_ParamGetIntVal(context, &parameter));
     }
     return SCPI_RES_OK;
 }
@@ -238,9 +244,9 @@
  * @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_ResultText(context, SCPI_MANUFACTURE);
+    SCPI_ResultText(context, SCPI_DEV_NAME);
+    SCPI_ResultText(context, SCPI_DEV_VERSION);
     return SCPI_RES_OK;
 }
 
@@ -260,7 +266,7 @@
  * @return 
  */
 scpi_result_t SCPI_CoreOpcQ(scpi_t * context) {
-    // Operation is always completed
+    /* Operation is always completed */
     SCPI_ResultInt(context, 1);
     return SCPI_RES_OK;
 }
@@ -283,9 +289,9 @@
  * @return 
  */
 scpi_result_t SCPI_CoreSre(scpi_t * context) {
-    int32_t new_SRE;
-    if (SCPI_ParamInt(context, &new_SRE, TRUE)) {
-        SCPI_RegSet(context, SCPI_REG_SRE, new_SRE);
+    scpi_parameter_t parameter;
+    if (SCPI_Parameter(context, &parameter, TRUE)) {
+        SCPI_RegSet(context, SCPI_REG_SRE, SCPI_ParamGetIntVal(context, &parameter));
     }
     return SCPI_RES_OK;
 }
@@ -319,7 +325,7 @@
     int result = 0;
     if (context && context->interface && context->interface->test) {
         result = context->interface->test(context);
-    }    
+    }
     SCPI_ResultInt(context, result);
     return SCPI_RES_OK;
 }
@@ -331,7 +337,7 @@
  */
 scpi_result_t SCPI_CoreWai(scpi_t * context) {
     (void) context;
-    // NOP
+    /* NOP */
     return SCPI_RES_OK;
 }
 

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