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29 lines
680 B
C
29 lines
680 B
C
#include "usart_sync.h"
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#include "core.h"
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#define USART_TX PIN_PA04
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#define USART_RX PIN_PA05
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#define USART_SERCOM SERCOM0
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void usart_init(void)
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{
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// CLOCKS INIT PCHCTRL
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if(!SERCOM0->USART.SYNCBUSY.bit.SWRST)
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{
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uint32_t mode = SERCOM0->USART.CTRLA.bit.MODE;
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if(SERCOM0->USART.CTRLA.bit.ENABLE)
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{
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SERCOM0->USART.CTRLA.bit.ENABLE = 0;
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while(SERCOM0->USART.SYNCBUSY.bit.ENABLE);
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}
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SERCOM0->USART.CTRLA.reg = mode | SERCOM_USART_CTRLA_SWRST;
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while(SERCOM0->USART.SYNCBUSY.bit.SWRST || SERCOM0->USART.SYNCBUSY.bit.ENABLE);
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}
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while(SERCOM0->USART.SYNCBUSY.bit.SWRST);
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CRITICAL_SECTION_ENTER();
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SERCOM0->USART.CTRLA.bit.MODE =
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CRITICAL_SECTION_LEAVE();
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}
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