ASF Wizard

• Standard serial I/O (stdio) (driver): Common standard serial I/O management driver that implements a stdio serial interface on SAM devices.
• USART - Serial interface (service): Common API which abstracts the user from directly accessing the register and provides a generic serial interface using USART.
• PIO - Parallel Input/Output Controller (driver): The Parallel Input/Output Controller manages up to 32 fully programmable input/output lines. Each I/O line may be dedicated as a general-purpose I/O or be assigned to a function of an embedded peripheral. This assures effective optimization of the pins of a product.

src\config\conf_board.h

#ifndef CONF_BOARD_H

#define CONF_BOARD_H

#define CONSOLE_UART (Usart *)USART0

/** Enable Com Port. */

#define CONF_BOARD_UART_CONSOLE

#endif // CONF_BOARD_H

src\config\conf_uart_serial.h

#ifndef CONF_USART_SERIAL_H

#define CONF_USART_SERIAL_H

/* A reference setting for USART */

/** USART Interface */

#define CONF_UART CONSOLE_UART

/** Baudrate setting */

#define CONF_UART_BAUDRATE 115200

/** Character length setting */

#define CONF_UART_CHAR_LENGTH US_MR_CHRL_8_BIT

/** Parity setting */

#define CONF_UART_PARITY US_MR_PAR_NO

/** Stop bits setting */

#define CONF_UART_STOP_BITS US_MR_NBSTOP_1_BIT

#define USART_SERIAL CONF_UART

#define USART_SERIAL_ID ID_USART0

#define USART_SERIAL_BAUDRATE CONF_UART_BAUDRATE

#define USART_SERIAL_CHAR_LENGTH CONF_UART_CHAR_LENGTH

#define USART_SERIAL_PARITY CONF_UART_PARITY

#define USART_SERIAL_STOP_BIT CONF_UART_STOP_BITS

#define PINS_USART0_PIO PIOA

#define PINS_USART0_ID USART_SERIAL_ID

#define PINS_USART0_TYPE PIO_PERIPH_A

#define PINS_USART0_ATTR PIO_DEFAULT

#define PINS_USART0_MASK (PIO_PA5A_RXD0 | PIO_PA6A_TXD0)

#endif /* CONF_USART_SERIAL_H_INCLUDED */

Examples

#include "conf_uart_serial.h"

#include <asf.h>

void serial_init(void) {

pio_configure(

PINS_USART0_PIO, PINS_USART0_TYPE, PINS_USART0_MASK, PINS_USART0_ATTR);

pmc_enable_periph_clk(USART_SERIAL_ID);

sysclk_enable_peripheral_clock(USART_SERIAL_ID);

const usart_serial_options_t usart_serial_options

= {.baudrate = USART_SERIAL_BAUDRATE,

.charlength = USART_SERIAL_CHAR_LENGTH,

.paritytype = USART_SERIAL_PARITY,

.stopbits = USART_SERIAL_STOP_BIT};

stdio_serial_init(USART_SERIAL, &usart_serial_options);

}

int main(void) {

sysclk_init();

board_init();

/* Insert application code here, after the board has been initialized. */

wdt_disable(WDT);

serial_init();

for(;;) {

uint16_t temp;

scanf("%d", &temp);

printf("%d\r\n", temp);

}

}