// Transmit an 8 bit value as is via serial

void USART0_transmit(uint8_t data) {

	while ( !( UCSR0A & (1<<UDRE0)) )			// Wait for empty transmit buffer
    ;
	UCSR0A |= (1<<TXC0); 						// clear txc flag
	UDR0 = data;								// Put data into buffer, sends the data
}



// Transmit an unsigned 8 bit value as a series of up to three decimal characters, omitting leading zeros
void USART0_transmit_uint8(uint8_t val) {
	unsigned char buf[3];						// assign buffer for temporary storage. 3 characters is enough.
												// Note that the characters are stored reversed, ie right to left
	int8_t ptr;

	for(ptr=0;ptr<3;++ptr) {					// get the digits from the right
		buf[ptr] = (val % 10) + '0';			// by doing modulo 10, adding the character '0' to make them printable
		val /= 10;								// and dividing our input number by 10
	}

												// this segment suppresses leading zeros:
	for(ptr=2;ptr>0;--ptr) {					// now, reading from most significant character to least significant, if
												// it is not '0', then its a real number and we start priting
		if (buf[ptr] != '0') break;				// break will leave ptr pointing to the character to output
	}

	for(;ptr>=0;--ptr) {						// now, going forward again, transmit the characters, most significant first
		USART0_transmit(buf[ptr]);
	}
}