uartstream.md

UART library short introduction

In this short introduction the basic functions of the uart library and their usage are described. If there are any issues or improvements please feel free to report.

Directives

Name	Value(s)	Description
F_CPU	System Clock	Setup the system clock speed
BAUD	Baudrate	9600 / 19200 / ...
UART_DATASIZE	Datasize	5,6,...,8
UART_PARITY	Parity	0 (none), 1 (even), 2(odd)
UART_STOPBITS	Stopbits	1,2
UART_RXC_ECHO	Echo	Enabled: Received data will be returned to sender
UARTRXCIE	defined/undefined	Receiver Interrupt processing
UARTTXCIE	defined/undefined	Transmitter Interrupt processing
UARTUDRIE	defined/undefined	Data register interrupt processing

Initial Function

void uart_init(void);

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Transmit single character

int uart_putchar(char c, FILE *stream);

c

Value(s)	Description
unsigned char	Byte/ASCII char for transmission over UART

stream

Value(s)	Description
FILE	Pointer to file stream (stdout, stderr)

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Receive single character

int uart_getchar(FILE *stream);

stream

Value(s)	Description
FILE	Pointer to file stream (stdin)

Function Return

Return	Status
0x00	Error during transmission occurred
unsigned char	Received data

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Reset Function

Clear errors that occurred during transmissions

void uart_error(void);

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