1 | /********************************************************************************************/
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2 | /* Include-files ****************************************************************************/
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3 | /********************************************************************************************/
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4 |
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5 | #include <STM32F10x.h>
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6 |
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7 | /********************************************************************************************/
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8 | /* Variablen ********************************************************************************/
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9 | /********************************************************************************************/
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10 |
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11 | int ADWert, AD_Val;
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12 |
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13 | /********************************************************************************************/
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14 | /* Hauptprogramm Main ***********************************************************************/
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15 | /********************************************************************************************/
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16 |
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17 | void init(void)
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18 | {
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19 |
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20 | RCC -> APB2ENR |= 1 << 6; // Enable GPIOE clock
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21 | RCC -> APB2ENR |= 1 << 5; // Enable GPIOD clock
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22 | RCC -> APB2ENR |= 1 << 4; // Enable GPIOC clock
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23 | GPIOD -> CRL &= 0x00000000;
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24 | GPIOD -> CRL = 0x88888888;
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25 | GPIOD -> CRH = 0x88888338;
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26 | GPIOD -> BSRR = 0 << 10;
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27 | GPIOD -> BSRR = 0 << 9;
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28 | GPIOC -> CRL &= 0x00000000;
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29 | GPIOC -> CRL = 0xBB888888;
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30 | GPIOE -> CRH = 0x33333333; // Configure the GPIO for LEDs
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31 |
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32 | RCC -> APB2ENR |= 1 << 9; // Enable ADC1 clock
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33 | ADC1 -> SQR1 = 0x00000000; // Regular channel 1 conversion
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34 | ADC1 -> SQR2 = 0x00000000; // Clear register
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35 | ADC1 -> SQR2 = 0x00000000; // Clear register
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36 | ADC1 -> SQR3 = 14 << 0; // SQ1 = channel 14
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37 | ADC1 -> SMPR1 = 5 << 12; // Channel 14 sample time is 55.5 cyc
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38 | ADC1 -> SMPR2 = 0x00000000; // Clear register
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39 | ADC1 -> CR1 = 1 << 8; // Scan mode on
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40 | ADC1 -> CR2 = (1 << 20) | // Enable external trigger
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41 | (7 << 17) | // EXTSEL = SWSTART
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42 | (1 << 1) | // Continuous conversion
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43 | (1 << 0) ; // ADC enable
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44 | ADC1 -> CR2 |= 1 << 3; // Initialize calibration registers
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45 | while (ADC1->CR2 & (1 << 3)) ; // Wait for initialization to finish
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46 | ADC1 -> CR2 |= 1 << 2 ; // Start calibration
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47 | while (ADC1->CR2 & (1 << 2)) ; // Wait for calibration to finish
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48 | ADC1 -> CR2 |= 1 << 22 ; // Start first conversion
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49 |
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50 | // Konfiguration der GPIO für Push Buttons
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51 |
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52 | RCC -> CFGR = 0x001d8402;
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53 | RCC -> CR = 0x01000081;
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54 |
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55 | while(RCC -> CR == (1<<1))
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56 | {
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57 | __nop();
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58 | }
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59 |
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60 | //RCC -> APB2ENR |= 1 << 3; // Enable GPIOB clock
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61 | RCC -> APB2ENR |= 1 << 0; // Alternate function Clock
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62 | RCC -> APB2ENR |= 1 << 13; // Enable Timer 8 clock
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63 |
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64 | TIM8 -> CR1 = 0x0060; // Das Auto-Reload Register wird gepuffert; Center Aligned Mode 3, Auf- und Abzählen. Es wird bei Überlauf und Unterlauf ein Event ausgelöst.
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65 | TIM8 -> CR2 = 0x0000; // Reset Kontrollregister 2
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66 | TIM8 -> PSC = 0x0032; // Prescaler
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67 | TIM8 -> ARR = 0x0FFF; // Auto-Reload Register
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68 | TIM8 -> CCMR1 = 0x6060; // Compare Mode Register 1 Outputcompare Mode
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69 | TIM8 -> CCMR2 = 0x0000; // Compare Mode Register 2 Output Compare 3 Mode; Output Compare 4 Mode
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70 | TIM8 -> CCER = 0x0011; // Compare Enable Register; Compare 3 Output Enable; Compare 4 Output Enable
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71 | TIM8 -> SMCR = 0x0000; // Slave Mode Kontroll Register
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72 | TIM8 -> CCR1 = 0x0000; // Compare Register 1
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73 | TIM8 -> CCR2 = 0x0000; // Compare Register 2
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74 | TIM8 -> SR = 0x0000; // Status Register: Interrupt Flagbits
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75 | TIM8 -> DIER = 0x0006; // Interrupt Enable Register: Interrupt Compare 3 und Compare 4 zugelassen
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76 | TIM8 -> EGR = 0x0003; // Event Generator Register: Update generation; Compare 3 Generation / Compare 4 Generation
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77 | TIM8 -> CR1 = 0x0061; // Timer 8 starten
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78 |
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79 | for (;;)
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80 | { // Loop forever
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81 | if (ADC1->SR & (1 << 1)) // If conversion has finished
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82 | {
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83 | AD_Val = ADC1->DR & 0x0FFF; // Read AD converted value
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84 | ADC1->CR2 |= 1 << 22; // Start new conversion
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85 | }
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86 |
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87 | ADWert = AD_Val << 4;
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88 | GPIOE -> BSRR = ADWert;
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89 | GPIOE -> BSRR |= 0xFF000000;
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90 |
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91 | TIM8 -> CCR1 = ADC1 -> DR; // Compare Register 3; Vergleichsregister mit dem AD-Wert laden
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92 |
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93 | }
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94 |
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95 | }
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