root / branches / autonomous_recharging / code / projects / colonet / utilities / robot_wireless_relay / serial.c @ 1390
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1 | 13 | emarinel | /*
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2 | serial.c - Functions for using the RS232 serial port
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3 | |||
4 | author: Robotics Club, Colony Project
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5 | |||
6 | much code taken from FWR's library, author: Tom Lauwers
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7 | |||
8 | |||
9 | general note - serial -> uart
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10 | serial1 -> uart1
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11 | this is done for clarity purposes
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12 | */
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13 | |||
14 | |||
15 | #include <avr/io.h> |
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16 | #include <stdio.h> |
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17 | #include "serial.h" |
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18 | |||
19 | //setup uart0 (serial)
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20 | void serial_init(unsigned int ubrr) |
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21 | { |
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22 | /*Set baud rate - baud rates under 4800bps unsupported */
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23 | UBRR0H = 0x00;
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24 | UBRR0L = (unsigned char)ubrr; |
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25 | |||
26 | /*Enable receiver and transmitter */
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27 | UCSR0B |= (1<<RXEN0)|(1<<TXEN0); |
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28 | |||
29 | /* Set frame format: 8data, 1stop bit, asynchronous normal mode */
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30 | UCSR0C |= (1<<UCSZ00) | (1<<UCSZ01); |
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31 | } |
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32 | |||
33 | // uart_putchar - Low-level function which puts a value into the
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34 | // Tx buffer for transmission. Automatically injects
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35 | // a \r before all \n's
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36 | int serial_putchar(char c) |
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37 | { |
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38 | |||
39 | if (c == '\n') |
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40 | putchar('\r');
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41 | // Wait until buffer is clear for sending
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42 | loop_until_bit_is_set(UCSR0A, UDRE0); |
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43 | // Load buffer with your character
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44 | UDR0 = c; |
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45 | return 0; |
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46 | } |
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47 | |||
48 | // uart_getchar - Low-level function which waits for the Rx buffer
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49 | // to be filled, and then reads one character out of it.
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50 | // Note that this function blocks on read - it will wait until
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51 | // something fills the Rx buffer.
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52 | int serial_getchar(void) |
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53 | { |
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54 | char c;
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55 | // Wait for the receive buffer to be filled
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56 | loop_until_bit_is_set(UCSR0A, RXC0); |
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57 | |||
58 | // Read the receive buffer
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59 | c = UDR0; |
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60 | return c;
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61 | } |
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62 | |||
63 | // uart_getchar_nb - Low-level function which checks if the Rx buffer
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64 | // is filled, and then reads one character out of it.
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65 | // This is a non blocking version uart_getchar
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66 | int serial_getchar_nb(void) |
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67 | { |
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68 | char c;
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69 | // Wait for the receive buffer to be filled
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70 | |||
71 | if (UCSR0A & _BV(RXC0)){
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72 | // Read the receive buffer
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73 | c = UDR0; |
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74 | return c;
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75 | } |
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76 | |||
77 | return 0; |
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78 | } |
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79 | |||
80 | //setup uart1 (serial1)
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81 | void serial1_init( unsigned int ubrr) |
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82 | { |
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83 | /*Set baud rate - baud rates under 4800bps unsupported */
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84 | UBRR1H = 0x00;
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85 | UBRR1L = (unsigned char)ubrr; |
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86 | |||
87 | /*Enable receiver and transmitter */
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88 | UCSR1B |= (1<<RXEN1)|(1<<TXEN1); |
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89 | |||
90 | /* Set frame format: 8data, 1stop bit, asynchronous normal mode */
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91 | UCSR1C |= (1<<UCSZ10) | (1<<UCSZ11); |
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92 | |||
93 | /* For use with fprintf() and related functions */
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94 | serial1_stream = fdevopen(serial1_putchar, serial1_putchar); |
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95 | |||
96 | /* To use fprintf():
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97 | After calling serial1_init(BAUD115200);
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98 | use the command fprintf(serial1_stream, "Hello World");
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99 | This call to fdevopen() does give a compile warning
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100 | but works fine.
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101 | -Greg Tress
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102 | */
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103 | } |
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104 | |||
105 | //put to uart1 (serial1)
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106 | int serial1_putchar(char c) |
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107 | { |
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108 | |||
109 | if (c == '\n') |
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110 | serial1_putchar('\r'); //changed from putchar aj |
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111 | // Wait until buffer is clear for sending
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112 | loop_until_bit_is_set(UCSR1A, UDRE1); |
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113 | // Load buffer with your character
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114 | UDR1 = c; |
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115 | return 0; |
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116 | } |
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117 | |||
118 | //get from uart1 (serial1)
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119 | int serial1_getchar(void) |
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120 | { |
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121 | char c;
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122 | // Wait for the receive buffer to be filled
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123 | loop_until_bit_is_set(UCSR1A, RXC1); |
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124 | |||
125 | // Read the receive buffer
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126 | c = UDR1; |
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127 | return c;
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128 | } |
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129 | |||
130 | //get from uart1 non-block
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131 | int serial1_getchar_nb(void) |
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132 | { |
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133 | char c;
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134 | // Wait for the receive buffer to be filled
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135 | //loop_until_bit_is_set(UCSR1A, RXC1);
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136 | if (UCSR1A & _BV(RXC1)){
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137 | // Read the receive buffer
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138 | c = UDR1; |
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139 | return c;
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140 | } |
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141 | return 0; |
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142 | |||
143 | } |