Diff: main.cpp

Revision:

0:b712470aea1d

Child:

1:9b1df0b2507d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Sep 30 16:13:41 2014 +0000
@@ -0,0 +1,81 @@
+#include "mbed.h"
+#include "arm_math.h"
+#include "math_helper.h"
+#include <stdio.h>
+
+
+#define BLOCK_SIZE 32
+#define NUM_BLOCKS 10
+#define TEST_LENGTH_SAMPLES (BLOCK_SIZE * NUM_BLOCKS)
+#define TEST_LENGTH_SAMPLES 312
+#define SNR_THRESHOLD_F32 140.0f
+#define NUM_TAPS 29
+
+Serial pc(SERIAL_TX, SERIAL_RX);
+
+/* -------------------------------------------------------------------
+* The input signal and reference output (computed with MATLAB)
+* are defined externally in arm_fir_lpf_data.c.
+* ------------------------------------------------------------------- */
+
+extern float32_t testInput_f32_1kHz_15kHz[TEST_LENGTH_SAMPLES];
+extern float32_t refOutput[TEST_LENGTH_SAMPLES];
+
+/* -------------------------------------------------------------------
+* Declare State buffer of size (numTaps + blockSize - 1)
+* ------------------------------------------------------------------- */
+
+static float32_t firStateF32[BLOCK_SIZE + NUM_TAPS - 1];
+
+/* ----------------------------------------------------------------------
+* FIR Coefficients buffer generated using fir1() MATLAB function.
+* fir1(28, 6/24)
+* ------------------------------------------------------------------- */
+
+const float32_t firCoeffs32[NUM_TAPS] = {
+-0.0018225230f, -0.0015879294f, +0.0000000000f, +0.0036977508f, +0.0080754303f,
++0.0085302217f, -0.0000000000f, -0.0173976984f, -0.0341458607f, -0.0333591565f,
++0.0000000000f, +0.0676308395f, +0.1522061835f, +0.2229246956f, +0.2504960933f,
++0.2229246956f, +0.1522061835f, +0.0676308395f, +0.0000000000f, -0.0333591565f,
+-0.0341458607f, -0.0173976984f, -0.0000000000f, +0.0085302217f, +0.0080754303f,
++0.0036977508f, +0.0000000000f, -0.0015879294f, -0.0018225230f
+};
+/* ----------------------------------------------------------------------
+* FIR LPF Example
+* ------------------------------------------------------------------- */
+int main(void) {
+/* Call FIR init function to initialize the instance structure. */
+arm_fir_instance_f32 S;
+arm_fir_init_f32(&S, NUM_TAPS, (float32_t *)&firCoeffs32[0], &firStateF32[0], BLOCK_SIZE);
+/* ----------------------------------------------------------------------
+* Call the FIR process function for every blockSize samples
+* ------------------------------------------------------------------- */
+for (uint32_t i=0; i < NUM_BLOCKS; i++) {
+float32_t* signal = testInput_f32_1kHz_15kHz + (i * BLOCK_SIZE);
+arm_fir_f32(&S, signal, signal, BLOCK_SIZE);
+}
+/* ----------------------------------------------------------------------
+* Compare the generated output against the reference output computed
+* in MATLAB.
+* ------------------------------------------------------------------- */
+//float32_t snr = arm_snr_f32((float*)refOutput, (float*)testInput_f32_1kHz_15kHz, (unsigned)TEST_LENGTH_SAMPLES);
+
+float32_t snr;
+unsigned int b;
+arm_max_f32( testInput_f32_1kHz_15kHz,TEST_LENGTH_SAMPLES, &snr, &b); 
+
+  
+pc.printf("snr: %f\n\r", snr);
+while(1)
+{
+    if (snr < SNR_THRESHOLD_F32) {
+        pc.printf("Failed\n\r");
+        pc.printf("snr: %f\n\r", snr);
+        } else {
+            pc.printf("Success\n\r");
+                    pc.printf("snr: %f\n\r", snr);
+            }
+}
+
+
+}
\ No newline at end of file