#include "usart_sync.h"
#include "core.h"

#define USART_TX PIN_PA04
#define USART_RX PIN_PA05
#define USART_SERCOM SERCOM0

void usart_init(void)
{
	// CLOCKS INIT PCHCTRL 
	if(!SERCOM0->USART.SYNCBUSY.bit.SWRST)
	{
		uint32_t mode = SERCOM0->USART.CTRLA.bit.MODE;
		if(SERCOM0->USART.CTRLA.bit.ENABLE)
		{
			SERCOM0->USART.CTRLA.bit.ENABLE = 0;
			while(SERCOM0->USART.SYNCBUSY.bit.ENABLE);
		}

		SERCOM0->USART.CTRLA.reg = mode | SERCOM_USART_CTRLA_SWRST;
		while(SERCOM0->USART.SYNCBUSY.bit.SWRST || SERCOM0->USART.SYNCBUSY.bit.ENABLE);
	}
	while(SERCOM0->USART.SYNCBUSY.bit.SWRST);

	CRITICAL_SECTION_ENTER();
	SERCOM0->USART.CTRLA.bit.MODE = 
	CRITICAL_SECTION_LEAVE();
}