1 | #include <p33FJ64GS606.h>
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2 | #include <stdlib.h>
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3 | #include <delay.h>
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4 |
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5 | // Select Internal FRC at POR
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6 | _FOSCSEL(FNOSC_FRC & IESO_OFF);
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7 | // Enable Clock Switching and Configure Primary Oscillator in XT mode
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8 | _FOSC(FCKSM_CSECMD & OSCIOFNC_OFF & POSCMD_NONE);
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9 |
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10 | _FWDT(FWDTEN_OFF) //disable the watchdog timer
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11 | _FICD(JTAGEN_OFF & ICS_PGD1);//disable JTAG, enable debugging on PGx1 pins
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12 |
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13 | void configureOscillator(void);
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14 | void initTimer1(void);
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15 | void __attribute__((__interrupt__, no_auto_psv)) _T1Interrupt(void);
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16 | void enableInterrupts(void);
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17 | void disableInterrupts(void);
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18 |
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19 |
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20 | int main(void) {
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21 | configureOscillator();
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22 | initTimer1();
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23 | enableInterrupts();
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24 |
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25 | //outputs to 0
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26 | _LATB12 = 0;
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27 | _LATB13 = 0;
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28 | _LATB14 = 0;
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29 |
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30 | // led outputs
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31 | _TRISB12 = 0;
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32 | _TRISB13 = 0;
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33 | _TRISB14 = 0;
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34 |
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35 |
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36 | while (1) {
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37 |
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38 | _LATB12 = 1;
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39 | _LATB13 = 0;
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40 |
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41 | //Warteschleife
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42 | int i = 0;
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43 | for(i=0; i<30;i++)
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44 | {
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45 | int o = 0;
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46 | for(o=0; o<10000;o++) {}
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47 |
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48 | }
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49 | _LATB12 = 1;
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50 | _LATB13 = 1;
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51 |
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52 | //Warteschleife
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53 | for(i=0; i<30;i++)
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54 | {
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55 | int o = 0;
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56 | for(o=0; o<10000;o++) {}
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57 | }
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58 |
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59 | }
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60 | }
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61 |
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62 |
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63 | void configureOscillator(void)
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64 | {
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65 | // Configure PLL prescaler, PLL postscaler, PLL divisor
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66 | PLLFBD=150; // M=152
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67 | CLKDIVbits.PLLPOST=0; // N2=2
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68 | CLKDIVbits.PLLPRE=5; // N1=7
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69 |
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70 | // Initiate Clock Switch to Primary Oscillator with PLL (NOSC=0b011)
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71 | __builtin_write_OSCCONH(0x01);
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72 | __builtin_write_OSCCONL(OSCCON | 0x01);
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73 |
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74 | // Wait for Clock switch to occur
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75 | while (OSCCONbits.COSC!= 0b001);
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76 | // Wait for PLL to lock
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77 | while (OSCCONbits.LOCK!= 1);
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78 | return;
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79 | }
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80 |
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81 | void initTimer1(void)
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82 | {
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83 | T1CONbits.TON = 0;// Disable Timer
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84 | T1CONbits.TCS = 0;// Select internal instruction cycle clock
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85 | T1CONbits.TGATE = 0;// Disable Gated Timer mode
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86 | T1CONbits.TCKPS = 0b11;// Select 1:256 Prescaler
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87 | //11 = 1:256 prescale value
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88 | //10 = 1:64 prescale value
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89 | //01 = 1:8 prescale value
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90 | //00 = 1:1 prescale value
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91 |
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92 | TMR1 = 0x00; // Clear timer register
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93 | PR1 = 20000; // Load the period value
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94 |
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95 | IPC0bits.T1IP = 1;// Set Timer1 Interrupt Priority Level
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96 | IFS0bits.T1IF = 0;// Clear Timer1 Interrupt Flag
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97 | IEC0bits.T1IE = 1;// Enable Timer1 interrupt
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98 | T1CONbits.TON = 1;// Start Timer
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99 | return;
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100 | }
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101 |
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102 |
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103 | void __attribute__((__interrupt__, no_auto_psv)) _T1Interrupt(void)
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104 | {
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105 | /* Clear Timer1 interrupt */
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106 | IFS0bits.T1IF = 0;
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107 |
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108 | LATBbits.LATB14 = ~LATBbits.LATB14;
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109 | }
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110 |
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111 | void enableInterrupts(void)
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112 | {
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113 | /* Set CPU IPL to 0, enable level 1-7 interrupts */
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114 | /* No restoring of previous CPU IPL state performed here */
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115 | SRbits.IPL = 0;
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116 | //SRbits.IPL = 0 funktioniert nur in Release .... in Debug wird bei einem Wert von 0 der PIC "halted"
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117 | //SRbits.IPL = 1 (=IPC0bits.T1IP) funktioniert sowohl im Debug als auch im Release
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118 | return;
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119 | }
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120 |
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121 |
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122 | void disableInterrupts(void)
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123 | {
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124 | /* Set CPU IPL to 7, disable level 1-7 interrupts */
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125 | /* No saving of current CPU IPL setting performed here */
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126 | SRbits.IPL = 7;
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127 | return;
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128 | }
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