1  | #include "stm32f4xx_conf.h"
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2  | 
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3  | void Delay(__IO uint32_t nCount);
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4  | void initGPIO(void);
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5  | void WaitForHSE(void);
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6  | 
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7  | GPIO_InitTypeDef GPIO_InitStructure;
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8  | 
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9  | int main(void)
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10  | {
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11  |     SystemInit();
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12  |     WaitForHSE();
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13  |     initGPIO();
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14  | 
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15  |     uint8_t switch_counter = 0;
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16  |     bool button_state = false;
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17  | 
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18  |     while(1)
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19  |     {
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20  |         switch_counter++;
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21  | 
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22  |         if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == 1)
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23  |         {
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24  |             if(button_state == true)
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25  |                 button_state = false;
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26  |             else
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27  |                 button_state = true;
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28  |         }
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29  | 
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30  |         if(button_state == true)
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31  |         {
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32  |             switch(switch_counter)
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33  |             {
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34  |             case 1:
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35  |                 GPIO_SetBits(GPIOD, GPIO_Pin_12);
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36  |                 break;
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37  |             case 2:
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38  |                 GPIO_SetBits(GPIOD, GPIO_Pin_13);
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39  |                 break;
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40  |             case 3:
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41  |                 GPIO_SetBits(GPIOD, GPIO_Pin_14);
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42  |                 break;
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43  |             case 4:
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44  |                 GPIO_SetBits(GPIOD, GPIO_Pin_15);
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45  |                 break;
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46  |             default:
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47  |                 GPIO_ResetBits(GPIOD, GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
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48  |                 switch_counter = 0;
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49  |             }
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50  |         }
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51  |         else
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52  |             GPIO_ResetBits(GPIOD, GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
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53  | 
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54  | 
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55  |         Delay(0x3FFFFF);
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56  |     }
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57  | }
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58  | 
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59  | void initGPIO(void)
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60  | {
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61  |    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
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62  |    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
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63  | 
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64  |    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
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65  |    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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66  |    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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67  |    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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68  |    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
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69  |    GPIO_Init(GPIOD, &GPIO_InitStructure);
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70  | 
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71  |    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
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72  |    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
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73  |    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
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74  |    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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75  |    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
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76  |    GPIO_Init(GPIOA, &GPIO_InitStructure);
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77  | }
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78  | 
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79  | void Delay(__IO uint32_t nCount)
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80  | {
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81  |     while(nCount--) {}
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82  | }
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83  | 
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84  | void WaitForHSE(void)
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85  | {
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86  |     RCC_HSEConfig(RCC_HSE_ON);
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87  |     while(!RCC_WaitForHSEStartUp()) {}
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88  | }
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