From d677719d0ef0f8ad831a8859aceefc0c3dcb57e7 Mon Sep 17 00:00:00 2001
From: Philip Howard <phil@gadgetoid.com>
Date: Tue, 10 Jul 2012 22:43:51 +0100
Subject: [PATCH] Experimental shiftOutWithDelay

---
 wiringPi/wiringShift.c | 33 +++++++++++++++++++++++++++++++++
 wiringPi/wiringShift.h |  1 +
 2 files changed, 34 insertions(+)

diff --git a/wiringPi/wiringShift.c b/wiringPi/wiringShift.c
index 68c5faf..3682b22 100644
--- a/wiringPi/wiringShift.c
+++ b/wiringPi/wiringShift.c
@@ -82,3 +82,36 @@ void shiftOut (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val)
       digitalWrite (cPin, LOW) ;
     }
 }
+
+
+/*
+ * shiftOut:
+ *	Shift data out to a clocked source
+ *********************************************************************************
+ */
+
+void shiftOutWithDelay (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val, uint8_t delay)
+{
+  int8_t i;
+
+  if (order == MSBFIRST)
+    for (i = 7 ; i >= 0 ; --i)
+    {
+      digitalWrite (dPin, val & (1 << i)) ;
+      delayMicroseconds (delay) ;
+      digitalWrite (cPin, HIGH) ;
+      delayMicroseconds (delay) ;
+      digitalWrite (cPin, LOW) ;
+      delayMicroseconds (delay) ;
+    }
+  else
+    for (i = 0 ; i < 8 ; ++i)
+    {
+      digitalWrite (dPin, val & (1 << i)) ;
+      delayMicroseconds (delay) ;
+      digitalWrite (cPin, HIGH) ;
+      delayMicroseconds (delay) ;
+      digitalWrite (cPin, LOW) ;
+      delayMicroseconds (delay) ;
+    }
+}
diff --git a/wiringPi/wiringShift.h b/wiringPi/wiringShift.h
index d723c5f..79c0fa6 100644
--- a/wiringPi/wiringShift.h
+++ b/wiringPi/wiringShift.h
@@ -35,6 +35,7 @@ extern "C" {
 
 extern uint8_t shiftIn  (uint8_t dPin, uint8_t cPin, uint8_t order) ;
 extern void    shiftOut (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val) ;
+extern void	   shiftOutWithDelay (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val, uint8_t delay) ;
 
 #ifdef __cplusplus
 }