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#include "Arduino.h"
#include "HardwareSerial.h"
// Each HardwareSerial is defined in its own file, sine the linker pulls
// in the entire file when any element inside is used. --gc-sections can
// additionally cause unused symbols to be dropped, but ISRs have the
// "used" attribute so are never dropped and they keep the
// HardwareSerial instance in as well. Putting each instance in its own
// file prevents the linker from pulling in any unused instances in the
// first place.
#if defined(HAVE_HWSERIAL0)
#if defined(USART_RX_vect)
ISR(USART_RX_vect)
#elif defined(USART0_RX_vect)
ISR(USART0_RX_vect)
#elif defined(USART_RXC_vect)
ISR(USART_RXC_vect) // ATmega8
#else
#error "Don't know what the Data Received vector is called for the first UART"
#endif
{
Serial._rx_complete_irq();
}
#if defined(UART0_UDRE_vect)
ISR(UART0_UDRE_vect)
#elif defined(UART_UDRE_vect)
ISR(UART_UDRE_vect)
#elif defined(USART0_UDRE_vect)
ISR(USART0_UDRE_vect)
#elif defined(USART_UDRE_vect)
ISR(USART_UDRE_vect)
#else
#error "Don't know what the Data Register Empty vector is called for the first UART"
#endif
{
Serial._tx_udr_empty_irq();
}
#if defined(UBRRH) && defined(UBRRL)
HardwareSerial Serial(&UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR);
#else
HardwareSerial Serial(&UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0);
#endif
// Function that can be weakly referenced by serialEventRun to prevent
// pulling in this file if it's not otherwise used.
bool Serial0_available() {
return Serial.available();
}
#endif // HAVE_HWSERIAL0
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