1 | /*************************************************************************
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2 | Title: example program for the Interrupt controlled UART library
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3 | Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
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4 | File: $Id: test_uart.c,v 1.5 2012/09/14 17:59:08 peter Exp $
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5 | Software: AVR-GCC 3.4, AVRlibc 1.4
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6 | Hardware: any AVR with built-in UART, tested on AT90S8515 at 4 Mhz
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7 |
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8 | DESCRIPTION:
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9 | This example shows how to use the UART library uart.c
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10 |
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11 | *************************************************************************/
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12 | #include <stdlib.h>
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13 | #include <avr/io.h>
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14 | #include <avr/interrupt.h>
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15 | #include <avr/pgmspace.h>
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16 | #include <util/delay.h>
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17 |
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18 | #include "uart.h"
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19 |
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20 |
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21 | /* define CPU frequency in Mhz here if not defined in Makefile */
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22 | #ifndef F_CPU
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23 | #define F_CPU 4000000UL
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24 | #endif
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25 |
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26 | /* 9600 baud */
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27 | #define UART_BAUD_RATE 9600
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28 |
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29 |
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30 | int main(void)
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31 | {
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32 | unsigned int c;
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33 | char buffer[7];
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34 | int num=134;
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35 |
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36 | lcd_init(); // lcd init
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37 | vWillkommen(); // Begrüssungstext
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38 | _delay_ms(2000); // warte, damit Anzeige nicht gleich weg ist
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39 | DDRA = 0xFF; // PORTA Ausgang
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40 | PORTA = 0xFF; // Alle auf EIN
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41 |
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42 |
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43 | /*
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44 | * Initialize UART library, pass baudrate and AVR cpu clock
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45 | * with the macro
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46 | * UART_BAUD_SELECT() (normal speed mode )
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47 | * or
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48 | * UART_BAUD_SELECT_DOUBLE_SPEED() ( double speed mode)
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49 | */
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50 | uart_init( UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU) );
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51 |
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52 | /*
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53 | * now enable interrupt, since UART library is interrupt controlled
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54 | */
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55 | sei();
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56 |
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57 | /*
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58 | * Transmit string to UART
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59 | * The string is buffered by the uart library in a circular buffer
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60 | * and one character at a time is transmitted to the UART using interrupts.
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61 | * uart_puts() blocks if it can not write the whole string to the circular
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62 | * buffer
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63 | */
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64 | uart_puts("String stored in SRAM\n");
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65 |
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66 | /*
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67 | * Transmit string from program memory to UART
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68 | */
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69 | uart_puts_P("String stored in FLASH\n");
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70 |
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71 |
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72 | /*
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73 | * Use standard avr-libc functions to convert numbers into string
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74 | * before transmitting via UART
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75 | */
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76 | itoa( num, buffer, 10); // convert interger into string (decimal format)
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77 | uart_puts(buffer); // and transmit string to UART
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78 |
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79 |
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80 | /*
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81 | * Transmit single character to UART
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82 | */
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83 | uart_putc('\r');
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84 |
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85 | for(;;)
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86 | {
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87 | /*
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88 | * Get received character from ringbuffer
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89 | * uart_getc() returns in the lower byte the received character and
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90 | * in the higher byte (bitmask) the last receive error
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91 | * UART_NO_DATA is returned when no data is available.
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92 | *
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93 | */
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94 | c = uart_getc();
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95 | if ( c & UART_NO_DATA )
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96 | {
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97 | /*
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98 | * no data available from UART
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99 | */
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100 | // hier etwas mit c machen z.B. auf PORT ausgeben
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101 |
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102 | }
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103 | else
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104 | {
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105 | /*
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106 | * new data available from UART
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107 | * check for Frame or Overrun error
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108 | */
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109 | if ( c & UART_FRAME_ERROR )
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110 | {
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111 | /* Framing Error detected, i.e no stop bit detected */
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112 | uart_puts_P("UART Frame Error: ");
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113 | }
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114 | if ( c & UART_OVERRUN_ERROR )
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115 | {
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116 | /*
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117 | * Overrun, a character already present in the UART UDR register was
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118 | * not read by the interrupt handler before the next character arrived,
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119 | * one or more received characters have been dropped
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120 | */
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121 | uart_puts_P("UART Overrun Error: ");
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122 | }
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123 | if ( c & UART_BUFFER_OVERFLOW )
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124 | {
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125 | /*
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126 | * We are not reading the receive buffer fast enough,
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127 | * one or more received character have been dropped
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128 | */
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129 | uart_puts_P("Buffer overflow error: ");
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130 |
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131 |
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132 | }
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133 | /*
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134 | * send received character back
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135 | */
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136 | uart_putc( (unsigned char)c );
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137 | //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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138 | // ab hier mein Teil der Programmierung
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139 | //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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140 | ID_Werte(&c); //Daten des ID Tag's auf dem LCD ausgeben *-*-*-*-*-*-*-*-*-*-*-*-*-*
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141 |
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142 | /* void ID_Werte(char *wert)
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143 | {
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144 | lcd_clear();
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145 | // itoa(WERT,Value,10); // umwandeln einer dez.-Zahl (WERT zB 11) in ASCII-Zeichen 11 (LCD kann nur ASCII-Zeichen ausgeben!!!)
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146 | // itoa(-12,Value,10); // umwandeln der Zahl -12 in ASCII -12 (LCD kann nur ASCII-Zeichen ausgeben!!!)
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147 | lcd_pos(2,0);
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148 | lcd_text("ID-Wert:");
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149 | lcd_pos(3,10);
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150 | lcd_text(wert);
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151 | }
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152 | */
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153 | //+++++++++++++++++++++++++++++ ENDE meiner Programmierung +++++++++++++++++++++++++++++++++
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154 | }
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155 | }
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156 |
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157 | }
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