1 | #include <stddef.h>
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2 | #include "stm32f10x.h"
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3 |
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4 | volatile uint8_t my_EXTI = 0;
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5 |
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6 | //***********************************************************************************************
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7 | // System-Einstellungen
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8 | //***********************************************************************************************
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9 | void SetupSystem (void) {
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10 | GPIO_InitTypeDef GPIO_InitStructure;
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11 |
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12 | RCC_DeInit (); // RCC System Reset(for debug purpose)
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13 |
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14 | // Enable HSE (Umschaltung auf externen Quarz)
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15 | RCC_HSEConfig (RCC_HSE_ON);
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16 |
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17 | // HSE-Umschaltung abwarten
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18 | while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);
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19 |
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20 | // System-Taktung
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21 | RCC_HCLKConfig (RCC_SYSCLK_Div1); // HCLK = SYSCLK
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22 | RCC_PCLK2Config (RCC_HCLK_Div1); // PCLK2 (APB2) = HCLK
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23 | RCC_PCLK1Config (RCC_HCLK_Div2); // PCLK1 (APB1) = HCLK/2
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24 | RCC_ADCCLKConfig (RCC_PCLK2_Div6); // ADCCLK = PCLK2/6
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25 |
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26 | // FLASH-Speicher Zugriff
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27 | FLASH_SetLatency(FLASH_Latency_2); // Flash - 2 wait states
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28 | FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); // Pipeline freigeben
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29 |
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30 | // PLL Konfiguration
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31 | // PLLCLK = 8MHz * 9 = 72 MHz
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32 | RCC_PLLConfig (RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); // Externer Quarz, Faktor 9
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33 | RCC_PLLCmd (ENABLE); // Enable PLL
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34 |
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35 | // PLL-Konfiguration abwarten
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36 | while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
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37 |
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38 | // PLL als System-Takt auswählen
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39 | RCC_SYSCLKConfig (RCC_SYSCLKSource_PLLCLK);
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40 |
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41 | // PLL-Umschaltung abwarten
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42 | while (RCC_GetSYSCLKSource() != 0x08);
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43 |
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44 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // GPIO A Takt freigeben
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45 |
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46 | /* Configure PA.00 pin as input PULL-UP */
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47 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
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48 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
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49 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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50 |
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51 | /* Connect EXTI0 Line to PA.00 pin */
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52 | GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
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53 | }
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54 |
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55 | //***********************************************************************************************
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56 | // Nested Vectored Interrupt Controller initialisieren
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57 | //***********************************************************************************************
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58 | void NVIC_Configuration (void) {
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59 | NVIC_InitTypeDef NVIC_InitStructure;
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60 | EXTI_InitTypeDef EXTI_InitStructure;
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61 |
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62 | EXTI_DeInit();
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63 |
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64 | NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); // FLASH Vector Table
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65 | NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // Pre = 2 Bit / Sub = 2 Bit
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66 |
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67 | /* Configure EXTI0 line */
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68 | EXTI_InitStructure.EXTI_Line = EXTI_Line0;
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69 | EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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70 | EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
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71 | EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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72 | EXTI_Init(&EXTI_InitStructure);
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73 |
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74 | /* Enable and set EXTI0 Interrupt to the lowest priority */
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75 | NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
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76 | NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
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77 | NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
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78 | NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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79 | NVIC_Init(&NVIC_InitStructure);
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80 | }
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81 |
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82 |
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83 | // sollte ins stm32f10x_it.c
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84 | extern volatile uint8_t my_EXTI;
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85 | void EXTI0_IRQHandler(void)
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86 | {
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87 | if(EXTI_GetITStatus(EXTI_Line0) != RESET)
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88 | {
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89 | my_EXTI = 1;
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90 |
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91 | /* Clear the EXTI line 0 pending bit */
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92 | EXTI_ClearITPendingBit(EXTI_Line0);
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93 | }
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94 | }
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95 |
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96 |
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97 | // MAIN
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98 | main...
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99 |
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100 | SetupSystem();
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101 | NVIC_Configuration():
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102 | while(1) {
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103 |
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104 | if (my_EXTI) {
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105 | // mach was , LED toggle oder so
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106 | // Pause
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107 | my_EXTI = 0;
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108 | }
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109 |
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110 | }
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