Diff: dsp/Sine_f32.cpp

Revision:

1:fdd22bb7aa52

Child:

4:9cee975aadce

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dsp/Sine_f32.cpp	Wed Nov 28 12:30:09 2012 +0000
@@ -0,0 +1,56 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "Sine_f32.h"
+#include "math_helper.h"
+
+#define RAD_2PI         (2. * PI)
+
+namespace dsp {
+
+Sine_f32::Sine_f32(uint32_t frequency, uint32_t sample_rate, float32_t amplitude, float32_t phase, uint32_t block_size) {
+    _dx = RAD_2PI * ((float32_t)frequency / (float32_t)sample_rate);
+    _amplitude = amplitude;
+    _x = phase;
+    _block_size = block_size;
+}
+
+void Sine_f32::process(float32_t *sgn_in, float32_t *sgn_out) {
+    for (int i=0; i<_block_size; i++) {
+        *sgn_out = *sgn_in + (_amplitude * arm_sin_f32(_x));
+        sgn_in++; sgn_out++;
+        _x += _dx;
+    }
+}
+
+void Sine_f32::generate(float32_t *sgn) {
+    for (int i=0; i<_block_size; i++) {
+        *sgn = (_amplitude * arm_sin_f32(_x));
+        sgn++;
+        _x += _dx;
+    }
+}
+
+void Sine_f32::reset(void) {
+    _x = 0.0f;
+}
+
+}