driver_init.c

/*
 * Code generated from Atmel Start.
 *
 * This file will be overwritten when reconfiguring your Atmel Start project.
 * Please copy examples or other code you want to keep to a separate file
 * to avoid losing it when reconfiguring.
 */

#include "driver_init.h"
#include <peripheral_clk_config.h>
#include <utils.h>
#include <hal_init.h>

/*! The buffer size for USART */
#define USART_0_BUFFER_SIZE 32

struct usart_async_descriptor USART_0;

static uint8_t USART_0_buffer[USART_0_BUFFER_SIZE];

/**
 * \brief USART Clock initialization function
 *
 * Enables register interface and peripheral clock
 */
void USART_0_CLOCK_init()
{

	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM4_GCLK_ID_CORE, CONF_GCLK_SERCOM4_CORE_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM4_GCLK_ID_SLOW, CONF_GCLK_SERCOM4_SLOW_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));

	hri_mclk_set_APBCMASK_SERCOM4_bit(MCLK);
}

/**
 * \brief USART pinmux initialization function
 *
 * Set each required pin to USART functionality
 */
void USART_0_PORT_init()
{

	gpio_set_pin_function(PB08, PINMUX_PB08D_SERCOM4_PAD0);

	gpio_set_pin_function(PB09, PINMUX_PB09D_SERCOM4_PAD1);
}

/**
 * \brief USART initialization function
 *
 * Enables USART peripheral, clocks and initializes USART driver
 */
void USART_0_init(void)
{
	USART_0_CLOCK_init();
	usart_async_init(&USART_0, SERCOM4, USART_0_buffer, USART_0_BUFFER_SIZE, (void *)NULL);
	USART_0_PORT_init();
}

void system_init(void)
{
	init_mcu();

	USART_0_init();
}