Diff: main.cpp

Revision:

0:bfac05b2d50f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jun 05 14:29:43 2017 +0000
@@ -0,0 +1,137 @@
+////////////////////////////////////////
+//      Tau_ReSpeaker_DSP_Test        //
+//  Arkadiraf@gmail.com - 29/05/2017  //
+////////////////////////////////////////
+/*
+ If button pressed --> generate sine wave else analog output = analog input
+*/
+
+/*
+   Board : Nucleo STM32F446RE
+   Power Source : USB
+*/
+
+/*
+    Pinout:
+    PC - Serial 2
+    PA_2 (Tx) --> STLINK
+    PA_3 (Rx) --> STLINK
+
+    Switch - Serial 3
+    PC_10 (Tx) --> SW_Rx
+    PC_11 (Rx) --> SW_Tx
+
+    I2C_Bus
+    PB_8 --> SCL
+    PB_9 --> SDA
+
+    Digital output
+    PA_5 --> led (DigitalOut)
+
+    Digital Input
+    PA_10 --> SW_Trigger
+    PC_13 --> BTN (Blue)
+
+    Analog Input
+    PA_0 --> SIG_IN_DSP
+
+    Analog Output
+    PA_4 --> SIG_OUT_DSP
+
+*/
+
+///////////////
+// Libraries //
+///////////////
+#include "mbed.h"
+#include "BufferedSerial.h"  // solves issues of loosing data. alternative doing it yourself
+
+///////////////
+// #defines  //
+///////////////
+
+#define DEBUG_MOD1
+
+// Sine generator
+#define PI        (3.141592653589793238462)
+#define AMPLITUDE (1.0)    // x * 3.3V
+#define PHASE     (PI * 1) // 2*pi is one period
+#define RANGE     (0x7FFF)
+#define OFFSET    (0x7FFF)
+#define BUFFER_SIZE (360)
+
+/////////////
+// Objects //
+/////////////
+
+// uart
+BufferedSerial pc(USBTX, USBRX);
+
+// digital
+DigitalIn user_button(PC_13);
+DigitalIn sw_trigger(PA_10);
+DigitalOut led(PA_5);
+
+// analog
+AnalogOut dsp_output(PA_4);
+AnalogIn dsp_input(PA_0);
+
+///////////////
+// variables //
+///////////////
+
+// analog input
+uint16_t adc_in=0;
+
+// sin wave buffer
+uint16_t buffer[BUFFER_SIZE];
+uint16_t buffer_index=0;
+///////////////
+// Functions //
+///////////////
+
+// Create the sinewave buffer
+void calculate_sinewave(void);
+
+////////////////////////
+//  Main Code Setup : //
+////////////////////////
+int main()
+{
+    pc.baud(57600);
+#ifdef DEBUG_MOD1
+    pc.printf("ReSpeaker Test \r\n");
+#endif
+    // calculate sine wave buffer
+    calculate_sinewave();
+
+    ///////////////////////
+    //  Main Code Loop : //
+    ///////////////////////
+    while(1) {
+        // check button state
+        if (user_button) {
+            //adc_in=dsp_input.read_u16();
+            dsp_output.write_u16(dsp_input.read_u16()); //adc_in
+        } else {
+            // sinewave output
+            buffer_index++;
+            if (buffer_index>=BUFFER_SIZE) buffer_index=0;
+            dsp_output.write_u16(buffer[buffer_index]);
+            wait_us(1);
+        }
+    }
+}
+
+///////////////
+// Functions //
+///////////////
+
+// Create the sinewave buffer
+void calculate_sinewave(void)
+{
+    for (int i = 0; i < BUFFER_SIZE; i++) {
+        double rads = (PI * i)/180.0; // Convert degree in radian
+        buffer[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET);
+    }
+}
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