Initial commit

serial.cpp

@@ -0,0 +1,90 @@
+#include "serial.h"
+
+char rxBuffer[BUFFER_SIZE];
+volatile uint16_t interruptIndex = 0;
+
+ISR (USART_RX_vect) //I have seen worse interrupt sintax
+{
+	rxBuffer[interruptIndex % BUFFER_SIZE] = UDR0;
+	interruptIndex++;
+}
+
+Serial::Serial()
+{
+    UBRR0H = UBRRH_VALUE;
+    UBRR0L = UBRRL_VALUE;
+    UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); 
+    UCSR0B = _BV(RXEN0) | _BV(TXEN0);   //Enable RX and TX
+    UCSR0B |= (1 << RXCIE0); //Enable Rx interuppt
+}
+
+void Serial::putChar(const char c)
+{
+    loop_until_bit_is_set(UCSR0A, UDRE0);
+    UDR0 = c;
+}
+
+void Serial::putString(const char* in, const unsigned int length)
+{
+    for(unsigned int i = 0; i < length; i++)
+    {
+        putChar(in[i]);
+    }
+}
+
+void Serial::putString(const char in[])
+{
+    for(unsigned int i = 0; i < strlen(in); i++)
+    {
+        putChar(in[i]);
+    }
+}
+
+bool Serial::dataIsWaiting()
+{
+    return (interruptIndex > _rxIndex);
+}
+
+char Serial::getChar()
+{
+    if( _rxIndex >= (32768) - 2*BUFFER_SIZE ) flush(); //may explode only occasionaly
+    if(dataIsWaiting())
+    {
+        _rxIndex++;
+        return rxBuffer[(_rxIndex -1) % BUFFER_SIZE];
+    }
+    else return '\0';
+}
+
+int Serial::getString(char* buffer, const int bufferLength)
+{
+    int i = 0;
+    for(; i <= (interruptIndex-_rxIndex) && i <= BUFFER_SIZE && rxBuffer[(_rxIndex+i) % BUFFER_SIZE] != _terminator; i++);
+    
+    if( i < (interruptIndex-_rxIndex) && i > 0)
+    {
+       for(int j = 0 ; j < i &&  j < bufferLength ; j++)
+       {
+           buffer[j] = getChar();
+       }
+       _rxIndex++;
+    }
+    else
+    {
+         i = 0;
+         if( _rxIndex >= (32768) - 2*BUFFER_SIZE ) flush();
+    }
+
+    if (rxBuffer[(_rxIndex+i) % BUFFER_SIZE] == _terminator) _rxIndex++;
+    
+    return i;
+}
+
+void Serial::flush()
+{
+    _rxIndex = 0;
+    interruptIndex = 0;
+    for(int i = 0; i < BUFFER_SIZE; i++) rxBuffer[i] = ' ';
+}
+
+void Serial::setTerminator(char terminator){_terminator = terminator;}