1 | #include "stm32f10x_gpio.h"
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2 | #include "stm32f10x_rcc.h"
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3 | #include "stm32f10x_usart.h"
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4 | #include "stm32f10x_tim.h"
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5 | #include "misc.h"
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6 |
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7 | GPIO_InitTypeDef GPIO_InitStructure;
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8 | TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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9 | USART_InitTypeDef USART_InitStructure;
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10 |
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11 | #define READ_BUFFER_SIZE 20
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12 |
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13 | volatile char read_buffer[READ_BUFFER_SIZE];
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14 | volatile char read_buffer_single = 0;
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15 | volatile char string_complete = 0;
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16 | volatile int uart_str_count = 0;
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17 |
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18 | void Delay(__IO uint32_t nCount)
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19 | {
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20 | while(nCount--)
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21 | {
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22 | }
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23 | }
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24 |
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25 | void nvic_initialisierung(uint16_t IRQ)
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26 | {
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27 | NVIC_InitTypeDef NVIC_InitStructure; //create NVIC structure
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28 | NVIC_InitStructure.NVIC_IRQChannel = IRQ;
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29 | NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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30 | NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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31 | NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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32 | NVIC_Init(&NVIC_InitStructure);
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33 | }
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34 |
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35 | void UARTSend(const unsigned char *pucBuffer)
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36 | {
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37 |
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38 | while(*pucBuffer)
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39 | {
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40 | USART_SendData(USART1, (uint16_t) *pucBuffer++);
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41 | /* Loop until the end of transmission */
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42 | while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
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43 | {
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44 | }
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45 | }
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46 | }
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47 |
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48 | void USART_Configuration(void)
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49 | {
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50 |
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51 | // Enable USART1 and GPIOA clock */
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52 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
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53 |
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54 | /* Configure USART1 Tx (PA.09) as alternate function push-pull */
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55 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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56 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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57 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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58 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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59 |
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60 | /* Configure USART1 Rx (PA.10) as input floating */
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61 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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62 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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63 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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64 |
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65 | /* USART1 configuration ------------------------------------------------------*/
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66 | /* USART1 configured as follow:
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67 | - BaudRate = 19200 baud
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68 | - Word Length = 8 Bits
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69 | - One Stop Bit
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70 | - No parity
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71 | - Hardware flow control disabled (RTS and CTS signals)
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72 | - Receive and transmit enabled
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73 | - USART Clock disabled
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74 | - USART CPOL: Clock is active low
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75 | - USART CPHA: Data is captured on the middle
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76 | - USART LastBit: The clock pulse of the last data bit is not output to
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77 | the SCLK pin
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78 | */
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79 | USART_InitStructure.USART_BaudRate = 19200;
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80 | USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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81 | USART_InitStructure.USART_StopBits = USART_StopBits_1;
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82 | USART_InitStructure.USART_Parity = USART_Parity_No;
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83 | USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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84 | USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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85 |
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86 | USART_Init(USART1, &USART_InitStructure);
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87 |
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88 | /* Enable the USART1 Receive interrupt: this interrupt is generated when the
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89 | USART1 receive data register is not empty */
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90 | USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
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91 |
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92 | /* Enable USART1 */
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93 | USART_Cmd(USART1, ENABLE);
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94 | }
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95 |
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96 |
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97 | void USART1_IRQHandler(void)
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98 | {
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99 | if (USART_GetITStatus(USART1,USART_IT_RXNE) == SET)
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100 | {
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101 | USART_ClearITPendingBit(USART1,USART_IT_RXNE);
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102 |
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103 | // Daten aus dem Puffer lesen
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104 | read_buffer_single = (USART1->DR & (uint16_t)0x01FF);
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105 |
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106 | if ( string_complete==0 )
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107 | {
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108 | //Bedingungen für ein Ende des Strings
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109 | if (read_buffer_single!='\n' && read_buffer_single!='\r' && uart_str_count<READ_BUFFER_SIZE-1)
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110 | {
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111 | read_buffer[uart_str_count]=read_buffer_single;
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112 | uart_str_count++;
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113 | }
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114 | else
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115 | {
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116 | read_buffer[uart_str_count]='\0';
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117 | uart_str_count=0;
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118 | string_complete=1;
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119 | }
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120 | }
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121 | }
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122 | }
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123 |
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124 |
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125 | int main(void)
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126 | {
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127 |
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128 | SystemInit();
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129 | nvic_initialisierung(USART1_IRQn);
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130 | USART_Configuration();
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131 |
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132 | while(1){
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133 | if (string_complete)
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134 | {
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135 | // Echo des gesendeten Strings erzeugen
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136 | // Achtung der String muss mit '\n' oder '\r' abgeschlossen werden beim Sender
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137 | UARTSend(read_buffer);
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138 | UARTSend("\n\r");
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139 | string_complete = 0;
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140 | }
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141 | }
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142 | }
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