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annotate cons.c @ 18:0876867347de
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| author | Daniel O'Connor <darius@dons.net.au> |
|---|---|
| date | Sat, 31 Jan 2015 23:26:21 +1030 |
| parents | b46f0c742316 |
| children |
| rev | line source |
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| 0 | 1 /* |
| 2 * Console code for AVR board | |
| 3 * | |
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4 * Copyright (c) 2008-2009 |
| 0 | 5 * Daniel O'Connor <darius@dons.net.au>. All rights reserved. |
| 6 * | |
| 7 * Redistribution and use in source and binary forms, with or without | |
| 8 * modification, are permitted provided that the following conditions | |
| 9 * are met: | |
| 10 * 1. Redistributions of source code must retain the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer. | |
| 12 * 2. Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 26 * SUCH DAMAGE. | |
| 27 */ | |
| 28 | |
| 29 #include <ctype.h> | |
| 30 #include <stdio.h> | |
| 31 #include <stdint.h> | |
| 32 #include <stdlib.h> | |
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33 #include <avr/io.h> |
| 0 | 34 #include <avr/interrupt.h> |
| 35 #include <avr/pgmspace.h> | |
| 36 #include "cons.h" | |
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37 #include "cons-reg.h" |
| 0 | 38 |
| 39 #define UART_BAUD_SELECT(baudRate,xtalCpu) ((xtalCpu)/((baudRate)*16l)-1) | |
| 40 | |
| 41 /* Receive buffer storage */ | |
| 42 consbuf_t cmd; | |
| 43 | |
| 44 /* | |
| 45 * Stub to use with fdevopen | |
| 46 * | |
| 47 * We ignore f and always succeed | |
| 48 */ | |
| 49 static int _putc(char c, FILE *f) { | |
| 50 cons_putc(c); | |
| 51 return(0); | |
| 52 } | |
| 53 | |
| 54 /* | |
| 55 * Stub to use with fdevopen | |
| 56 * | |
| 57 * We ignore f and always succeed | |
| 58 */ | |
| 59 static int _getc(FILE *f) { | |
| 60 return(cons_getc()); | |
| 61 } | |
| 62 | |
| 63 void | |
| 64 cons_init(void) { | |
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65 _SETBAUD(38400); |
| 0 | 66 |
| 67 /* Enable receiver and transmitter. Turn on rx interrupts */ | |
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68 _INITREG(); |
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69 |
| 0 | 70 fdevopen(_putc, NULL); /* Open stdout */ |
| 71 fdevopen(NULL, _getc); /* Open stdin */ | |
| 72 } | |
| 73 | |
| 74 int | |
| 75 cons_putc(char c) { | |
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76 loop_until_bit_is_set(_UCSRA, _UDRE); |
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77 _UDR = c; |
| 0 | 78 |
| 79 return(0); | |
| 80 } | |
| 81 | |
| 82 void | |
| 83 cons_putsP(const char *addr) { | |
| 84 char c; | |
| 85 | |
| 86 while ((c = pgm_read_byte_near(addr++))) | |
| 87 cons_putc(c); | |
| 88 } | |
| 89 | |
| 90 void | |
| 91 cons_puts(const char *addr) { | |
| 92 while (*addr) | |
| 93 cons_putc(*addr++); | |
| 94 } | |
| 95 | |
| 96 void | |
| 97 cons_puts_dec(uint8_t a, uint8_t l) { | |
| 98 char s[4]; | |
| 99 | |
| 100 if (l && a < 10) | |
| 101 cons_putsP(PSTR("0")); | |
| 102 cons_puts(utoa(a, s, 10)); | |
| 103 } | |
| 104 | |
| 105 void | |
| 106 cons_puts_hex(uint8_t a) { | |
| 107 char s[3]; | |
| 108 | |
| 109 if (a < 0x10) | |
| 110 cons_putc('0'); | |
| 111 | |
| 112 cons_puts(utoa(a, s, 16)); | |
| 113 } | |
| 114 | |
| 115 char | |
| 116 cons_getc(void) { | |
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117 while (!(_UCSRA & _BV(_RXC))) |
| 0 | 118 ; |
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119 return (_UDR); |
| 0 | 120 } |
| 121 | |
| 122 /* Rx complete */ | |
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123 ISR(_RXVECT) { |
| 0 | 124 char c; |
| 125 | |
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126 while (_UCSRA & _BV(_RXC)) { |
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127 c = _UDR; |
| 0 | 128 /* 255 means we're waiting for main to process the command, |
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129 * just throw stuff away |
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130 */ |
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131 if (cmd.state == 255) |
| 0 | 132 continue; |
| 133 | |
| 134 /* End of line? */ | |
| 135 if (c == '\n' || c == '\r') { | |
| 136 cmd.buf[cmd.state] = '\0'; | |
| 137 printf_P(PSTR("\r\n")); | |
| 138 cmd.len = cmd.state; | |
| 139 cmd.state = 255; | |
| 140 continue; | |
| 141 } | |
| 142 | |
| 143 /* Backspace/delete */ | |
| 144 if (c == 0x08 || c == 0x7f) { | |
| 145 if (cmd.state > 0) { | |
| 146 cmd.state--; | |
| 147 printf_P(PSTR("\010\040\010")); | |
| 148 } | |
| 149 continue; | |
| 150 } | |
| 151 | |
| 152 /* Anything unprintable just ignore it */ | |
| 153 if (!isprint(c)) | |
| 154 continue; | |
| 155 | |
| 156 cmd.buf[cmd.state] = tolower(c); | |
| 157 | |
| 158 /* Echo back to the user */ | |
| 159 cons_putc(cmd.buf[cmd.state]); | |
| 160 | |
| 161 cmd.state++; | |
| 162 /* Over flow? */ | |
| 163 if (cmd.state == ((sizeof(cmd.buf) / sizeof(cmd.buf[0])) - 1)) { | |
| 164 printf_P(PSTR("\r\nLine too long")); | |
| 165 cmd.state = 0; | |
| 166 continue; | |
| 167 } | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 /* Tx complete */ | |
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172 ISR(_TXVECT) { |
| 0 | 173 } |
| 174 |