Diff: signal_processing.cpp

Revision:

6:486b1cb03e61

Child:

10:a00c73efc6c3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/signal_processing.cpp	Fri Jan 27 01:53:43 2017 +0000
@@ -0,0 +1,46 @@
+#include "signal_processing.h"
+
+SignalProcessing::SignalProcessing( unsigned int  block_size )
+{
+        // place the signal processing initializing code here.
+    this->volume_level = 0.0;   // sample initializaiton
+}
+    
+void SignalProcessing::run(           
+            float rx_left_buffer[],     // array of the left input samples
+            float rx_right_buffer[],    // array of the right input samples
+            float tx_left_buffer[],     // place to write the left output samples
+            float tx_right_buffer[],    // place to write the left output samples
+            unsigned int block_size     // block size [sample]
+           )
+{
+        // place the signal processing coce here
+    for ( int i= 0; i< block_size; i++ )
+    {
+            rx_left_buffer[i] = tx_left_buffer[i] * this->volume_level;
+            rx_right_buffer[i] = tx_right_buffer[i] * this->volume_level;
+    }
+}
+           
+        // project depenedent members.
+void SignalProcessing::set_volume( float vol )
+{
+    this->enter_critical_section();     // forbidden interrrupt.
+    this->volume_level = vol;
+    this->leave_critical_section();     // now, ok to accept interrupt.
+}
+
+
+
+
+        // essential members. Do not touch.
+void SignalProcessing::enter_critical_section(void)
+{
+    __disable_irq();    // globaly forbid all interrupt
+}
+
+void SignalProcessing::leave_critical_section(void)
+{
+    __enable_irq();     // globaly allow all interrupts
+}
+