1 | #include "usart_driver.h"
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2 | #include "clksys_driver.h"
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3 | #include "avr_compiler.h"
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4 |
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5 | /*! Define that selects the Usart used in example. */
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6 | #define USARTT USARTE0
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7 | #define USARTR USARTC0
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8 |
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9 | /*! USART data struct used in example. */
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10 | USART_data_t USART_data;
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11 |
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12 | int main(void)
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13 | {
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14 | //set 16mhz external programmable clock
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15 | CLKSYS_XOSC_Config( OSC_FRQRANGE_12TO16_gc,
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16 | false,
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17 | OSC_XOSCSEL_EXTCLK_gc );
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18 | CLKSYS_Enable( OSC_XOSCEN_bm );
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19 | do {} while ( CLKSYS_IsReady( OSC_XOSCRDY_bm ) == 0 );
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20 | CLKSYS_Main_ClockSource_Select( CLK_SCLKSEL_XOSC_gc );
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21 |
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22 | /* PIN3 (TXD0) as output. */
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23 | PORTE.DIRSET = PIN3_bm;
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24 | /* PC2 (RXD0) as input. */
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25 | PORTC.DIRCLR = PIN2_bm;
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26 |
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27 |
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28 | /* Use USARTC0 and initialize buffers. */
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29 | USART_InterruptDriver_Initialize(&USART_data, &USARTR,&USARTT, USART_DREINTLVL_LO_gc);
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30 |
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31 | /* USARTC0, 8 Data bits, No Parity, 1 Stop bit. */
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32 | USART_Format_Set(&USARTR, USART_CHSIZE_8BIT_gc, USART_PMODE_DISABLED_gc, false);
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33 | /* USARTE0, 8 Data bits, No Parity, 1 Stop bit. */
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34 | USART_Format_Set(&USARTT, USART_CHSIZE_8BIT_gc, USART_PMODE_DISABLED_gc, false);
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35 |
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36 | /* Enable RXC interrupt. */
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37 | USART_RxdInterruptLevel_Set(&USARTR, USART_RXCINTLVL_LO_gc);
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38 |
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39 | //921600 baud
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40 | USART_Baudrate_Set(&USARTR, 11 , -7);
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41 | //11500 baud
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42 | USART_Baudrate_Set(&USARTT, 983 , -7);
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43 |
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44 | /* Enable both RX and TX. */
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45 | USART_Rx_Enable(&USARTR);
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46 | USART_Tx_Enable(&USARTT);
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47 | /* Enable PMIC interrupt level low. */
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48 | PMIC.CTRL |= PMIC_LOLVLEX_bm;
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49 | sei();
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50 | while(true) {
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51 | }
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52 | }
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53 | ISR(USARTC0_RXC_vect)
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54 | {
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55 | while (!(USARTE0.STATUS & USART_DREIF_bm));
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56 | USARTE0.DATA=0x4a;
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57 | }
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