From 4cd8a68a0ed6a5714fb05c51dde8c9da814a5731 Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周二, 18 6月 2013 22:44:55 +0800
Subject: [PATCH] Update to master
---
libscpi/src/ieee488.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/libscpi/src/ieee488.c b/libscpi/src/ieee488.c
index e3f4629..2dc0662 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;
}
--
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