mega_uart_interrupt_example.c File Reference

megaAVR STK600 UART interrupt example

Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.

#include <string.h>
#include "compiler.h"
#include "conf_clock.h"
#include "conf_uart.h"
#include <util/setbaud.h>
#include <avr/interrupt.h>
#include "ring_buffer.h"

Macros
#define	_ASSERT_ENABLE_
#define	BUFFER_SIZE   20
	The size of the UART buffer. More...

Functions
	ISR (UART0_DATA_EMPTY_IRQ)
	UART data register empty interrupt handler. More...
	ISR (UART0_RX_IRQ)
	Data RX interrupt handler. More...
int	main (void)
	The main application. More...
static bool	uart_char_waiting (void)
	Function to check if we have a char waiting in the UART receive buffer. More...
static uint8_t	uart_getchar (void)
	Function for getting a char from the UART receive buffer. More...
static void	uart_init (void)
	Initialize the UART with correct baud rate settings. More...
static void	uart_putchar (uint8_t data)
	Function for putting a char in the UART buffer. More...

Variables
uint8_t	in_buffer [BUFFER_SIZE]
uint8_t	out_buffer [BUFFER_SIZE]
struct ring_buffer	ring_buffer_in
	ring buffer to use for the UART reception More...
struct ring_buffer	ring_buffer_out
	ring buffer to use for the UART transmission More...
const char	test_string [] = "Hello, world!"

#define _ASSERT_ENABLE_

#define BUFFER_SIZE   20

The size of the UART buffer.

Referenced by uart_init().

ISR

(

UART0_DATA_EMPTY_IRQ

)

UART data register empty interrupt handler.

This handler is called each time the UART data register is available for sending data.

References ring_buffer_get(), ring_buffer_is_empty(), and ring_buffer_out.

ISR

(

UART0_RX_IRQ

)

Data RX interrupt handler.

This is the handler for UART receive data

References ring_buffer_in, and ring_buffer_put().

static bool uart_char_waiting ( void  )

inlinestatic

Function to check if we have a char waiting in the UART receive buffer.

Return values

true	if data is waiting
false	if no data is waiting

References ring_buffer_in, and ring_buffer_is_empty().

Referenced by main().

static uint8_t uart_getchar ( void  )

inlinestatic

Function for getting a char from the UART receive buffer.

Return values

Next	data byte in receive buffer

References ring_buffer_get(), and ring_buffer_in.

Referenced by main().

static void uart_init ( void  )

static

Initialize the UART with correct baud rate settings.

This function will initialize the UART baud rate registers with the correct values using the AVR libc setbaud utility. In addition set the UART to 8-bit, 1 stop and no parity.

References BUFFER_SIZE, in_buffer, out_buffer, ring_buffer_in, ring_buffer_init(), and ring_buffer_out.

Referenced by main().

static void uart_putchar ( uint8_t  data )

inlinestatic

Function for putting a char in the UART buffer.

Parameters

data	the data to add to the UART buffer and send

References ring_buffer_is_empty(), ring_buffer_out, and ring_buffer_put().

Referenced by main().

uint8_t in_buffer[BUFFER_SIZE]

Referenced by uart_init().

uint8_t out_buffer[BUFFER_SIZE]

Referenced by uart_init().

struct ring_buffer ring_buffer_in

ring buffer to use for the UART reception

Referenced by ISR(), uart_char_waiting(), uart_getchar(), and uart_init().

struct ring_buffer ring_buffer_out

ring buffer to use for the UART transmission

Referenced by ISR(), uart_init(), and uart_putchar().

const char test_string[] = "Hello, world!"

Referenced by main().