Mercurial > ~darius > hgwebdir.cgi > avr-lib
annotate cons.c @ 8:119688bb743f
Don't spin forever waiting for the TWI hardware to do something.
I _think_ this will help the case where I find the micro is hanging but I
haven't seen an error from it yet.
| author | darius@dons.net.au |
|---|---|
| date | Fri, 01 May 2009 15:21:31 +0930 |
| parents | 095216e8453d |
| children | b46f0c742316 |
| rev | line source |
|---|---|
| 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> | |
| 33 #include <avr/interrupt.h> | |
| 34 #include <avr/pgmspace.h> | |
| 35 #include "cons.h" | |
|
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36 #include "cons-reg.h" |
| 0 | 37 |
| 38 #define UART_BAUD_SELECT(baudRate,xtalCpu) ((xtalCpu)/((baudRate)*16l)-1) | |
| 39 | |
| 40 /* Receive buffer storage */ | |
| 41 consbuf_t cmd; | |
| 42 | |
| 43 /* | |
| 44 * Stub to use with fdevopen | |
| 45 * | |
| 46 * We ignore f and always succeed | |
| 47 */ | |
| 48 static int _putc(char c, FILE *f) { | |
| 49 cons_putc(c); | |
| 50 return(0); | |
| 51 } | |
| 52 | |
| 53 /* | |
| 54 * Stub to use with fdevopen | |
| 55 * | |
| 56 * We ignore f and always succeed | |
| 57 */ | |
| 58 static int _getc(FILE *f) { | |
| 59 return(cons_getc()); | |
| 60 } | |
| 61 | |
| 62 void | |
| 63 cons_init(void) { | |
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64 _SETBAUD(38400); |
| 0 | 65 |
| 66 /* Enable receiver and transmitter. Turn on rx interrupts */ | |
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67 _INITREG(); |
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68 |
| 0 | 69 fdevopen(_putc, NULL); /* Open stdout */ |
| 70 fdevopen(NULL, _getc); /* Open stdin */ | |
| 71 } | |
| 72 | |
| 73 int | |
| 74 cons_putc(char c) { | |
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75 loop_until_bit_is_set(_UCSRA, _UDRE); |
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76 _UDR = c; |
| 0 | 77 |
| 78 return(0); | |
| 79 } | |
| 80 | |
| 81 void | |
| 82 cons_putsP(const char *addr) { | |
| 83 char c; | |
| 84 | |
| 85 while ((c = pgm_read_byte_near(addr++))) | |
| 86 cons_putc(c); | |
| 87 } | |
| 88 | |
| 89 void | |
| 90 cons_puts(const char *addr) { | |
| 91 while (*addr) | |
| 92 cons_putc(*addr++); | |
| 93 } | |
| 94 | |
| 95 void | |
| 96 cons_puts_dec(uint8_t a, uint8_t l) { | |
| 97 char s[4]; | |
| 98 | |
| 99 if (l && a < 10) | |
| 100 cons_putsP(PSTR("0")); | |
| 101 cons_puts(utoa(a, s, 10)); | |
| 102 } | |
| 103 | |
| 104 void | |
| 105 cons_puts_hex(uint8_t a) { | |
| 106 char s[3]; | |
| 107 | |
| 108 if (a < 0x10) | |
| 109 cons_putc('0'); | |
| 110 | |
| 111 cons_puts(utoa(a, s, 16)); | |
| 112 } | |
| 113 | |
| 114 char | |
| 115 cons_getc(void) { | |
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116 while (!(_UCSRA & _BV(_RXC))) |
| 0 | 117 ; |
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118 return (_UDR); |
| 0 | 119 } |
| 120 | |
| 121 /* Rx complete */ | |
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122 ISR(_RXVECT) { |
| 0 | 123 char c; |
| 124 | |
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125 while (_UCSRA & _BV(_RXC)) { |
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126 c = _UDR; |
| 0 | 127 /* 255 means we're waiting for main to process the command, |
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128 * just throw stuff away |
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129 */ |
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130 if (cmd.state == 255) |
| 0 | 131 continue; |
| 132 | |
| 133 /* End of line? */ | |
| 134 if (c == '\n' || c == '\r') { | |
| 135 cmd.buf[cmd.state] = '\0'; | |
| 136 printf_P(PSTR("\r\n")); | |
| 137 cmd.len = cmd.state; | |
| 138 cmd.state = 255; | |
| 139 continue; | |
| 140 } | |
| 141 | |
| 142 /* Backspace/delete */ | |
| 143 if (c == 0x08 || c == 0x7f) { | |
| 144 if (cmd.state > 0) { | |
| 145 cmd.state--; | |
| 146 printf_P(PSTR("\010\040\010")); | |
| 147 } | |
| 148 continue; | |
| 149 } | |
| 150 | |
| 151 /* Anything unprintable just ignore it */ | |
| 152 if (!isprint(c)) | |
| 153 continue; | |
| 154 | |
| 155 cmd.buf[cmd.state] = tolower(c); | |
| 156 | |
| 157 /* Echo back to the user */ | |
| 158 cons_putc(cmd.buf[cmd.state]); | |
| 159 | |
| 160 cmd.state++; | |
| 161 /* Over flow? */ | |
| 162 if (cmd.state == ((sizeof(cmd.buf) / sizeof(cmd.buf[0])) - 1)) { | |
| 163 printf_P(PSTR("\r\nLine too long")); | |
| 164 cmd.state = 0; | |
| 165 continue; | |
| 166 } | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 /* Tx complete */ | |
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171 ISR(_TXVECT) { |
| 0 | 172 } |
| 173 |