Hallo,
ich versuche gerade den USART "receive complete interrupt" Interrupt
beim ATXMega16D4 mit fogendem Code ans laufen zu bekommen:
1 | #include <avr/io.h>
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2 | #include <stdio.h>
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3 |
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4 | #include <avr/interrupt.h>
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5 |
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6 | void clock_init(void);
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7 | void usart_init(void);
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8 |
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9 | unsigned char value;
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10 |
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11 |
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12 | int main(void)
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13 | {
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14 | //init external crystal 13,824MHz
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15 | clock_init();
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16 |
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17 | //PC2 as input
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18 | PORTC.DIR &= ~(1<<PIN2);
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19 |
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20 | //init usart
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21 | usart_init();
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22 |
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23 | sei();
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24 |
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25 |
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26 | while(1)
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27 | {
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28 | ;
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29 | }
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30 | }
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31 |
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32 | //init for external crystal with 13.824MHz
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33 | void clock_init(void)
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34 | {
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35 | OSC_XOSCCTRL = OSC_XOSCSEL_XTAL_16KCLK_gc |
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36 | OSC_FRQRANGE_12TO16_gc;
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37 | OSC.CTRL |= OSC_XOSCEN_bm;
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38 | while(!(OSC.STATUS & OSC_XOSCRDY_bm));
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39 | CCP = CCP_IOREG_gc;
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40 | CLK.CTRL = CLK_SCLKSEL_XOSC_gc;
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41 | }
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42 |
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43 |
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44 | void usart_init(void)
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45 | {
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46 | //Baud Rate 115200 bits per second
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47 | USARTC0.BAUDCTRLB = 0xF0;
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48 | USARTC0.BAUDCTRLA = 13;
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49 |
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50 | //high priority for RX-interrupt
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51 | USARTC0.CTRLA = USART_RXCINTLVL_HI_gc;
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52 | //enable the receive complete interrupt and select the interrupt level
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53 | USARTC0.CTRLA = USART_RXCINTLVL0_bm | USART_RXCINTLVL1_bm;
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54 | //Receiver Enable
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55 | USARTC0.CTRLB = USART_RXEN_bm;
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56 | //Asynchronous USART / 8data_bit - 1stop_bit - 0parity
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57 | USARTC0.CTRLC = 0x03;
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58 | }
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59 |
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60 |
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61 | ISR(USARTC0_RXC_vect)
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62 | {
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63 | value = USARTC0.DATA;
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64 | }
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Sende ich ein Byte vom PC über die USART Schnittstelle (Seriell to UART
Converter), wird das Receive Interrupt Flag gesetzt aber die Interrupt
Routine nicht ausgeführt. Hab ich noch irgendetwas vergessen?
