main
Last change
on this file since 6390cc3 was 6390cc3, checked in by Adrien Destugues <pulkomandy@…>, 7 years ago |
chiptest: Start to hack on ATmega128 and STK500 devboard.
- Set the proper clock for it (generated by the STK500 master MCU, did
not get crystal working reliably yet)
- Instead of just 'H', generate the whole alphabet for more action!
- Use ATmega128 since that's what happens to be seated on my board for
now.
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-
Property mode
set to
100644
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File size:
1.1 KB
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1 | #include <usart.h>
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2 |
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3 | #include <avr/io.h>
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4 | #include <avr/interrupt.h>
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5 | #include <avr/wdt.h>
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6 | #include <avr/pgmspace.h>
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7 | #include <util/delay.h>
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8 |
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9 | #include <string.h>
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10 | #include <stdbool.h>
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11 |
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12 | // muSerial: ATTiny2313 - LED = PD6
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13 | // K4KUSB: ATTiny2313 - LED = PB2
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14 | // STK500: anything, PORTD is convenient if available.
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15 | #define DDRLED DDRC
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16 | #define PORTLED PORTC
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17 | #define LEDBIT (1 << PC2)
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18 |
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19 | int main() {
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20 | wdt_enable(WDTO_2S);
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21 | // configure timer 0 for a rate of FCPU/(256 * 256)
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22 | #ifdef __AVR_ATtiny2313__
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23 | TCCR0A = 0; // timer 0 prescaler: 256
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24 | TCCR0B = 4;
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25 | #else
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26 | TCCR0 = 6; // timer 0 prescaler: 256
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27 | #endif
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28 |
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29 | //debug LED - output
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30 | DDRLED |= LEDBIT;
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31 | PORTLED &= ~LEDBIT;
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32 |
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33 | USARTInit();
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34 |
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35 | // Let's rock!
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36 | uint8_t counter = 0;
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37 | char c = 'a';
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38 | for(;;) {
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39 | wdt_reset();
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40 |
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41 | // Wait for timer overflow...
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42 | if (TIFR & (1 << TOV0)) {
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43 | TIFR = (1 << TOV0); // reset flag
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44 | counter++;
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45 |
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46 | if (counter == 0)
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47 | {
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48 | PORTLED ^= LEDBIT; // Toggle the LED
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49 | USARTWriteChar(c++); // Send a byte to the UART
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50 | if (c > 'z')
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51 | c = 'a';
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52 | }
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53 | }
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54 | }
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55 |
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56 | return 0;
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57 | }
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58 |
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