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