Hey,
I am a novice in the microcontroller and i have since one Week a
Problem.
I engraved this code below on mysmatcontrolM8 (s. picture).
But, i obtain only weird character although it is working property on
STK500 with atmega8.
I have already verified the frequenz, the Baud Rate and all are OK.
However, i obtain only weird character
I viewed the mysmartcontrolM8 product description: power supply via USB
connection, 5 V or 3.3 V.
I think, that maybe the failing is the diference between the power
supply of my PC and mysmatcontrolM8 (atmega8) !!! is that right!?! And
please which transformer can i use?
Or, where is my fault!?!
can somebody help me!!!
thank you
1 | #ifndef F_CPU
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2 | /* In the new version of the WinAVR/Mfile Makefile guideline One can defined F_CPU in the Makefile, a repeated
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3 | definition here would lead to a compiler warning . therefore "prevention" through #ifndef/#endif
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4 |
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5 | This "Prevention" can lead to Debugger, if AVRStudio use a another, not the hardware fitting Clock rate:
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6 | Then the following definition doesn't use, but instead the default value (1 MHz?) of AVRStudio - hence
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7 | the Output of a warning if F_CPU yet does not define:*/
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8 | #warning "F_CPU was not defined yet, now make up with 3686400"
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9 | #define F_CPU 3686400L // Systemtakt in Hz - define as long>> Without errors in the computation
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10 | #endif
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11 |
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12 |
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13 | #define BAUD 9600L
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14 | #define UBRR_VAL ((F_CPU+BAUD * 8)/(BAUD*16)-1) //clever round
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15 | #define BAUD_REAL (F_CPU/(16*(UBRR_VAL+1))) //real baud rate
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16 | #define BAUD_ERROR ((BAUD_REAL*1000)/BAUD-1000) //Error per thousand
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17 |
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18 |
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19 | #if ((BAUD_ERROR>10)||(BAUD_ERROR<-10))
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20 | #error Systematic error in the baud rate more than 1% and thus too high!
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21 | #endif
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22 |
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23 |
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24 | #include <avr/io.h>
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25 | #include <stdlib.h>
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26 | #include <inttypes.h>
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27 | #include <util/delay.h>
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28 |
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29 |
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30 |
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31 | void USART_Init(void)
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32 | {
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33 |
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34 | UBRRH = (unsigned char)(UBRR_VAL>>8); // Set baud rate
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35 | UBRRL = (unsigned char)UBRR_VAL;
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36 |
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37 | UCSRB |= (1<<RXEN)|(1<<TXEN); // Enable receiver and transmitter
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38 |
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39 | UCSRC = (1<<URSEL) | (1<<UCSZ0)|(1<<UCSZ1); // Set frame format: 8data, 1stop bit
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40 |
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41 | }//end USART_Init()
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42 |
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43 |
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44 | void USART_Putc(unsigned char c)
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45 | {
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46 | while (!(UCSRA & (1<<UDRE))); // Do nothing until data have been transmited
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47 |
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48 | UDR = c; // Put data into Buffer, sends the data
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49 | _delay_ms(10);
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50 | }//end USART_Putc()
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51 |
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52 |
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53 | void USART_Puts (char *string)
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54 | {
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55 | while( *string != '\0' ) //as long as *string != '\0' so unlike the "stringer end-character"
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56 | {
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57 | USART_Putc(*string);
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58 | string++;
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59 | }
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60 | }//end USART_Puts()
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61 |
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62 | int main(void)
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63 | {
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64 | USART_Init();
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65 | USART_Puts("\r\n");
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66 | while(1)
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67 | {
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68 | USART_Puts("Hey !!!!");
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69 | }
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70 |
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71 | return 0;
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72 | } //end main()
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mysmartconrolM8.png
(75 KB)
mysmartconrolM8.png
(75 KB)
