From db74c734f32821fd84a8671e1b664f8120241361 Mon Sep 17 00:00:00 2001
From: Andy Spencer <andy753421@gmail.com>
Date: Fri, 14 Feb 2014 09:29:16 +0000
Subject: [PATCH] Add sine wave generator

---
 yue/main.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/yue/main.cpp b/yue/main.cpp
index 150be36..3dfd736 100644
--- a/yue/main.cpp
+++ b/yue/main.cpp
@@ -224,9 +224,13 @@ void clock1_interrupt(void){
     static int tchCnt;
     static int a2dCnt;
     static int ledCnt;
+    static int sinCnt;
+
+    static float sinAmp  = 0.5;  // 0..1
+    static float sinFreq = 0.25; // Hz
 
     // Write A2D output sine wave
-    //a2dOutput.write(sin(a2dCnt * TIME_ACCURACY * (2*PI) * 0.1));
+    a2dOutput.write(sinAmp*sin(sinCnt * TIME_ACCURACY * (2*PI) * sinFreq)*0.5 + 0.5);
 
     // Send data through Serial
     if (accEnable && accCnt >= (int)(accTmr/TIME_ACCURACY+0.5)){
@@ -262,6 +266,7 @@ void clock1_interrupt(void){
     tchCnt++;
     a2dCnt++;
     ledCnt++;
+    sinCnt++;
 
     sdma_flush();
 }
-- 
2.43.2