1 | #include <msp430.h>
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2 |
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3 | /*
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4 | * ADXL362
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5 | * Auslesen der z-Achse
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6 | *
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7 | * P1.5 CS
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8 | * P1.6 MOSI
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9 | * P1.7 MISO
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10 | * P2.2 CLOCK
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11 | */
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12 |
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13 | void writeOneRegister(char value, char adress);
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14 | void writeTwoRegister(int value, char adress);
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15 | int readOneRegister(char adress);
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16 | int readTwoRegister(char adress);
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17 | void reset(void);
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18 |
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19 | int value;
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20 | char valueH;
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21 | char valueL;
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22 | int zAxis;
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23 |
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24 |
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25 | int main(void) {
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26 |
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27 | WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
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28 |
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29 | // Pin Konfiguration
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30 | P1SEL1 |= BIT6 + BIT7; // P1.6 als UCB0SIMO, P1.7 als UCB0SOMI
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31 | P2SEL1 |= BIT2; // P2.2 als UCB0CLK
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32 | P1DIR |= BIT5; // P1.5 als CS
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33 | P1OUT |= BIT5; // CS high setzen
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34 | P4DIR |= BIT6; // LED1
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35 | P4OUT |= BIT6; // LED1 an
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36 | P1IE |= BIT3 + BIT4; // P1.3 + P1.4 als INT1/2 für ADXL362
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37 |
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38 | PM5CTL0 &= ~LOCKLPM5;
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39 |
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40 | // Setup SPI (eUSCI_B)
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41 | UCB0CTLW0 |= UCSWRST; // UCB0 hold in reset state for configuration
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42 | UCB0CTLW0 |= UCCKPH + UCMSB + UCMST + UCMODE_0 + UCSYNC + UCSSEL_2; // Data captured on first edge + MSB first + Master Mode + 3-pin SPI + Synchronous Mode + SMCLK
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43 | UCB0BRW = 0; // Prescaler 1 -> CLK sollte mind. 1 MHz sein laut dem ADXL362 Datenblatt
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44 |
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45 | // Setup ADXL362
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46 |
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47 | writeOneRegister(0x15, 0x2C); // FILTER_CTL --> HALF_BW + ODR = 400Hz
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48 | writeOneRegister(0x02, 0x2D); // POWER_CTL --> Measurement Mode
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49 | reset();
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50 | while(1) {
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51 | P4OUT ^= BIT6; // Toggle LED1
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52 | zAxis = readTwoRegister(0x12); // Wert der z-Achse auselesen
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53 | __delay_cycles(100000); // 100ms Delay
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54 | }
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55 | }
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56 |
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57 | // Hilfsfunktionen
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58 |
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59 | void writeOneRegister(char value, char adress) { // 1 Byte in Register schreiben
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60 | UCB0CTLW0 &= ~UCSWRST; // reset released for operation
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61 | P1OUT &= ~BIT5; // CS enabled
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62 | UCB0TXBUF = 0x0A; // Schreib-Befehl senden
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63 | while(!(UCB0IFG & UCTXIFG)); // warten bis Shift-Register leer ist
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64 | UCB0TXBUF = adress; // Register-Adresse senden
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65 | while(!(UCB0IFG & UCTXIFG)); // warten bis Shift-Register leer ist
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66 | UCB0TXBUF = value; // Register-Wert senden
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67 | while(!(UCB0IFG & UCTXIFG)); // warten bis Shift-Register leer ist
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68 | P1OUT |= BIT5; // CS disabled
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69 | }
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70 |
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71 | int readOneRegister(char adress) { // 1-Byte Register lesen
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72 | UCB0CTLW0 &= ~UCSWRST; // reset released for operation
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73 | P1OUT &= ~BIT5; // CS enabled
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74 | UCB0TXBUF = 0x0B; // Lese-Befehl senden
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75 | while(!(UCB0IFG & UCTXIFG)); // warten bis Shift-Register leer ist
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76 | UCB0TXBUF = adress; // Register-Adresse senden
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77 | while(!(UCB0IFG & UCTXIFG)); // warten bis Shift-Register leer ist
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78 | value = UCB0RXBUF; // Register-Wert lesen
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79 | while(!(UCB0IFG & UCRXIFG)); // warten bis Shift-Register voll ist
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80 | P1OUT |= BIT5; // CS disabled
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81 | return value; // Wert zurückgeben
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82 | }
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83 |
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84 | void writeTwoRegister(int value, char adress) {
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85 | valueH = value >> 8;
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86 | valueL = value;
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87 | UCB0CTLW0 &= ~UCSWRST;
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88 | P1OUT &= ~BIT5;
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89 | UCB0TXBUF = 0x0A;
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90 | while(!(UCB0IFG & UCTXIFG));
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91 | UCB0TXBUF = adress;
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92 | while(!(UCB0IFG & UCTXIFG));
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93 | UCB0TXBUF = valueL;
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94 | while(!(UCB0IFG & UCTXIFG));
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95 | UCB0TXBUF = valueH;
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96 | while(!(UCB0IFG & UCTXIFG));
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97 | P1OUT |= BIT5;
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98 | }
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99 |
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100 | int readTwoRegister(char adress) {
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101 | UCB0CTLW0 &= ~UCSWRST;
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102 | P1OUT &= ~BIT5;
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103 | UCB0TXBUF = 0x0B;
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104 | while(!(UCB0IFG & UCTXIFG));
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105 | UCB0TXBUF = adress;
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106 | while(!(UCB0IFG & UCTXIFG));
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107 | valueL = UCB0RXBUF;
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108 | while(!(UCB0IFG & UCRXIFG));
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109 | valueH = UCB0RXBUF;
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110 | while(!(UCB0IFG & UCRXIFG));
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111 | P1OUT |= BIT5;
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112 | value = valueL + (valueH << 8);
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113 | return value;
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114 | }
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115 |
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116 | void reset(void) {
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117 | UCB0CTLW0 &= ~UCSWRST;
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118 | P1OUT &= ~BIT5;
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119 | UCB0TXBUF = 0x0B;
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120 | while(!(UCB0IFG & UCTXIFG));
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121 | UCB0TXBUF = 0x0B;
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122 | while(!(UCB0IFG & UCTXIFG));
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123 | value = UCB0RXBUF;
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124 | while(!(UCB0IFG & UCRXIFG));
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125 | P1OUT |= BIT5;
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126 | }
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