initial commit

1 files changed, 83 insertions, 0 deletions

diff --git a/electic_streaming2560/main.c b/electic_streaming2560/main.c
new file mode 100644
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+++ b/electic_streaming2560/main.c
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+/* test streaming sample data
+ * bluetooth
+ * TJR 141011
+
+ want: 1 second
+ 16M / 1024 prescale =
+
+ */
+
+#include <stdlib.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+//include <avr/signal.h>
+#include <avr/pgmspace.h>
+
+#include <math.h>
+
+#include "uart.h"
+
+//#include "HardwareSerial.h"
+
+#define SAMPLES 512
+
+#ifndef F_CPU
+#define F_CPU 16000000UL
+#endif
+#define UART_BAUD_RATE      57600
+
+//unsigned char dd[SAMPLES];  // ram buffer
+int enabled=0;
+int loopCount=0;
+int sample=0;
+
+int main(void)
+{
+  Serial.begin(57600);
+
+  //uart_init( UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU) );
+  DDRB |= (1 << 5); // port B bit 6 = arduino pin 13
+  PORTB = (1 << 5); //turn on to start
+  TCCR1B |= (1 << WGM12); // Configure timer 1 for CTC mode
+   TIMSK1 |= (1 << OCIE1A); // Enable CTC interrupt
+  OCR1A   = 1562; // Set CTC compare value to 1Hz at 1MHz AVR clock, with a prescaler of 64
+   sei(); //  Enable global interrupts
+  TCCR1B |= ((1<<CS10)|(1 << CS12)); // Set up timer at Fcpu/1024
+        //fill_sinewave();
+  unsigned int c;
+  /*      while(1) {
+            c = uart_getc();
+            if (!( c & UART_NO_DATA ))
+            {
+                uart_putc( (unsigned char)c );
+                if ((unsigned char)c=="a") {
+                    uart_puts_P("Welcome to electic");
+                    enabled=1;
+                }
+            }
+        }
+        */
+}
+
+ISR(TIMER1_COMPA_vect)
+{
+    if (enabled)   PORTB ^= (1 << 5);
+
+}
+/*
+void fill_sinewave(){
+  float pi = 3.141592;
+  float fcnt=0;
+  float fd;
+  float dx=2 * pi / SAMPLES;                    // fill the 512 byte bufferarry
+  int bb;
+http://www.johnhenryshammer.com/WOW2/pagesHowTo/atmelPage.php#index  for (int i = 0; i <= (SAMPLES-1); i++){      // with  50 periods sinewawe
+    fd= 127*sin(fcnt);                // fundamental tone
+    fcnt=fcnt+dx;                     // in the range of 0 to 2xpi  and 1/512 increments
+    bb=127+fd;                        // add dc offset to sinewawe
+    dd[i]=bb;                        // write value into array
+
+  }
+}
+*/
+