1 | void UART4_Config( void )
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2 | {
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3 | /**
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4 | * UART 4 HW- Initialisieren
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5 | * RX an PC11
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6 | * TX an PC 10
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7 | */
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8 |
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9 | GPIO_InitTypeDef GPIO_InitDef; // Initialisiserungsstruktur
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10 |
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11 |
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12 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); // Enable clock for GPIOC
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13 |
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14 |
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15 | GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_UART4); // Alternating function UART4 to PC11 (RX)
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16 | GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_UART4); // Alternating function UART4 to PC10 (TX)
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17 |
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18 | // Initialize pins as alternating function
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19 | GPIO_InitDef.GPIO_Pin = GPIO_Pin_10 |GPIO_Pin_11;
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20 | GPIO_InitDef.GPIO_Mode = GPIO_Mode_AF;
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21 | GPIO_InitDef.GPIO_OType = GPIO_OType_PP;
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22 | GPIO_InitDef.GPIO_PuPd = GPIO_PuPd_NOPULL;
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23 | GPIO_InitDef.GPIO_Speed = GPIO_Speed_50MHz; // Wichtig, da max. 42 MHz für UART
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24 |
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25 | GPIO_Init(GPIOC, &GPIO_InitDef); // Initalsierung der HW
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26 |
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27 | /**
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28 | * UART4 Initialisierung
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29 | * Baudrate: 38400
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30 | * Hardware Flow control: Disable
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31 | * Mode: RX
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32 | * Parity bit: Even
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33 | * Stop bit: 1
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34 | * Data bits: 8
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35 | */
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36 |
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37 | USART_InitTypeDef UART4_InitStruct; // Initialisiserungsstruktur
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38 |
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39 |
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40 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE); // Enable clock for UART4
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41 |
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42 | UART4_InitStruct.USART_BaudRate = 38400;
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43 | UART4_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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44 | UART4_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
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45 | UART4_InitStruct.USART_Parity = USART_Parity_Even;
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46 | UART4_InitStruct.USART_StopBits = USART_StopBits_1;
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47 | UART4_InitStruct.USART_WordLength = USART_WordLength_8b;
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48 |
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49 | USART_Init(UART4, &UART4_InitStruct); // Initalsierung UART
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50 |
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51 | USART_Cmd(UART4, ENABLE); // UART freischalten
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52 | }
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53 |
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54 | void NVIC_UART4_Config( void )
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55 | {
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56 | /**
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57 | * Initialize NVIC (Nested Vector Interrupt Controller)
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58 | * für UART RXNE Flag
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59 | * Höchste Priorität
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60 | */
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61 | NVIC_InitTypeDef NVIC_InitStruct;
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62 |
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63 | NVIC_InitStruct.NVIC_IRQChannel = UART4_IRQn;
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64 | NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
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65 | NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
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66 | NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00;
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67 | NVIC_Init(&NVIC_InitStruct);
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68 |
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69 | USART_ITConfig(UART4, USART_IT_LBD | USART_IT_TXE | USART_IT_TC | USART_IT_RXNE |
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70 | USART_IT_IDLE |USART_IT_PE |USART_IT_ERR, DISABLE ); // Alle Quellen deaktiveren
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71 |
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72 | USART_ITConfig(UART4, USART_IT_RXNE, ENABLE); // Interrupt für RXNE aktiveren
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73 | }
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74 |
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75 | void UART4_IRQHandler( void )
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76 | {
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77 | // Check Rx Interrupt
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78 | if(USART_GetITStatus(UART4, USART_IT_RXNE) == SET)
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79 | {
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80 | /* Read one byte from the receive data register */
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81 | RxBuffer[count++] = USART_ReceiveData(UART4);
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82 | countAll++;
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83 |
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84 | if (count > 100) {count = 0;}
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85 | }
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86 |
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87 |
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88 | else
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89 | {
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90 | // Sollte nie angesprungen werden, da alle anderen Interruptquellen für
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91 | // UART4 deaktivert sind
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92 | status = UART4 ->SR;
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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 | int main(void)
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98 | {
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99 | UART4_Config(); // Init HW und SW für UART4
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100 |
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101 | NVIC_UART4_Config(); // Init NVIC für UART4 RX
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102 |
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103 | uint16_t txBuffer[] = {0x00FF, 0x00AA, 0x00CC};
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104 | uint8_t i = 0;
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105 |
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106 | while (1)
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107 | {
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108 |
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109 | USART_SendData(UART4, txBuffer[i++]);
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110 |
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111 | if (i >2)
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112 | {
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113 | i = 0;
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114 | }
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115 |
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116 | while((USART_GetFlagStatus(UART4, USART_FLAG_TC)) == RESET) {}
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117 |
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118 | }
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119 | }
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