Diff: LUTs/LUTS.cpp

Revision:

9:f6ba53e355a0

Parent:

7:33cb5f2db1ee

Child:

10:258a1eca02cc

--- a/LUTs/LUTS.cpp	Tue May 05 16:46:01 2020 +0000
+++ b/LUTs/LUTS.cpp	Wed May 06 14:37:34 2020 +0000
@@ -7,14 +7,56 @@
 LUTs::~LUTs()
 {
 }
-
+    volatile uint16_t sin_wavtable[1024];
 
 void LUTs::sin_wavetable()
 {
     printf("Generating Wavetable \n");
-    for (int i=0; i<4096; i++) {
-        sin_d[i] = 0.5f*sin(2.0f*PI*(i/4096.0f));
-        wavtable[i]= sin_d[i]+0.5; //generates wave table 0<1 in double
-        //printf("wav[i]= %f \n", wavtable[i]); // Used for Debug
+    for (int i=0; i<1024; i++) {
+        sin_d= 65535*(0.5*sin(2.0*PI*(i/1024.0))+0.5);
+        //calculates remainder for rounding
+        rem= fmod(sin_d,1);
+        //printf("preround= %g -", sin_d); //DEBUG
+        if (rem>=0.5) {
+            sin_d=ceil(sin_d); //round UP
+        } else {
+            sin_d= floor(sin_d-rem); //round DOWN
+        }
+       // printf("Postround= %g -",sin_d); //DEBUG
+        sin_u=((uint16_t)sin_d);
+        //printf("sin_u= %u \n", sin_u);
+        sin_wavtable[i]=sin_u;
+        //sin_wavtable[i]=get_sin(i);
+    }
+     /*//DEBUG
+    for (int i=0; i<1024; i=i+128) {
+    printf("sin_wav[%d]= %u \n", i, sin_wavtable);
     }
-}
\ No newline at end of file
+    */
+}
+
+
+
+
+
+/*
+uint16_t get_sin(int i)
+{
+    //calculates sin val as double (0->65535)
+
+    sin_d= 65535*(0.5*sin(2.0*PI*(i/1024.0))+0.5);
+    //calculates remainder for rounding
+    rem= fmod(sin_d,1);
+    //printf("preround= %g -", sin_d[i]); //DEBUG
+    if (rem>=0.5) {
+        sin_d=ceil(sin_d); //round UP
+    } else {
+        sin_d= floor(sin_d-rem); //round DOWN
+    }
+    //printf("Postround= %g -",sin_d[i]); //DEBUG
+    return((uint16_t)sin_d);
+
+    //summed into one function
+    return((uint16_t)floor(65535*(0.5*sin(2.0*PI*(i/1024.0))+0.5)));
+}
+*/
\ No newline at end of file