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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2136 | - | 1 | /** |
| 2 | * a simple Fifo |
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| 3 | * @file fifo.c |
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| 4 | * @author Pascal Schnurr |
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| 5 | */ |
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| 6 | |||
| 7 | //############################################################################ |
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| 8 | //# HISTORY fifo.c |
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| 9 | //# |
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| 10 | //# 26.06.2014 OG |
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| 11 | //# - add: fifo_isstr() |
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| 12 | //# |
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| 13 | //# 16.04.2013 Cebra |
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| 14 | //# - chg: PROGMEM angepasst auf neue avr-libc und GCC, prog_char depreciated |
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| 15 | //# |
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| 16 | //############################################################################ |
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| 17 | |||
| 18 | |||
| 19 | #include <string.h> |
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| 20 | #include "fifo.h" |
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| 21 | //#if defined HWVERSION1_3W || defined HWVERSION3_9 || defined HWVERSION1_2W |
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| 22 | |||
| 23 | |||
| 24 | //-------------------------------------------------------------- |
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| 25 | void fifo_init (fifo_t * fifo, uint8_t * buffer, uint16_t size) |
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| 26 | { |
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| 27 | fifo->size = size; |
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| 28 | fifo->buffer = buffer; |
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| 29 | fifo->head = 0; |
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| 30 | fifo->count = 0; |
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| 31 | } |
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| 32 | //-------------------------------------------------------------- |
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| 33 | uint16_t fifo_getcount (const fifo_t * fifo) |
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| 34 | { |
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| 35 | |||
| 36 | return fifo->count; |
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| 37 | } |
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| 38 | //-------------------------------------------------------------- |
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| 39 | bool fifo_is_empty (const fifo_t * fifo) |
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| 40 | { |
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| 41 | return (fifo->count == 0); |
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| 42 | } |
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| 43 | |||
| 44 | //-------------------------------------------------------------- |
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| 45 | bool fifo_is_full (const fifo_t * fifo) |
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| 46 | { |
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| 47 | return (fifo->size - fifo->count == 0); |
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| 48 | } |
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| 49 | |||
| 50 | //-------------------------------------------------------------- |
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| 51 | bool fifo_read (fifo_t * fifo, char *data) |
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| 52 | { |
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| 53 | if (fifo_is_empty (fifo)) |
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| 54 | return false; |
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| 55 | |||
| 56 | uint8_t *head = fifo->buffer + fifo->head; |
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| 57 | |||
| 58 | *data = (char) * head; |
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| 59 | |||
| 60 | fifo->head = ( (fifo->head + 1) % fifo->size); |
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| 61 | |||
| 62 | fifo->count--; |
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| 63 | |||
| 64 | return true; |
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| 65 | } |
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| 66 | |||
| 67 | //-------------------------------------------------------------- |
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| 68 | bool fifo_write (fifo_t * fifo, const char data) |
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| 69 | { |
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| 70 | if (fifo_is_full (fifo)) |
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| 71 | return false; |
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| 72 | |||
| 73 | uint8_t *end = fifo->buffer + ( (fifo->head + fifo->count) % fifo->size); |
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| 74 | |||
| 75 | *end = (uint8_t) data; |
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| 76 | |||
| 77 | fifo->count++; |
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| 78 | |||
| 79 | return true; |
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| 80 | } |
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| 81 | |||
| 82 | //-------------------------------------------------------------- |
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| 83 | bool fifo_clear (fifo_t * fifo) |
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| 84 | { |
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| 85 | fifo->count = 0; |
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| 86 | fifo->head = 0; |
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| 87 | return true; |
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| 88 | } |
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| 89 | |||
| 90 | //-------------------------------------------------------------- |
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| 91 | static bool fifo_cmp_pgm_at (fifo_t * fifo, const char * pgm, const uint16_t index) |
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| 92 | { |
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| 93 | uint16_t i; |
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| 94 | uint8_t fifo_byte; |
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| 95 | uint8_t pgm_byte; |
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| 96 | |||
| 97 | for (i = 0; pgm_read_byte (pgm + i) != 0; i++) |
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| 98 | { |
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| 99 | if (fifo->count <= (i + index)) |
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| 100 | return false; |
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| 101 | |||
| 102 | pgm_byte = pgm_read_byte (pgm + i); |
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| 103 | |||
| 104 | fifo_byte = * (fifo->buffer + ( (fifo->head + i + index) % fifo->size)); |
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| 105 | |||
| 106 | if (fifo_byte != pgm_byte) |
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| 107 | return false; |
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| 108 | } |
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| 109 | |||
| 110 | // We found the string, lets move the pointer |
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| 111 | fifo->head = ( (fifo->head + i + index) % fifo->size); |
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| 112 | |||
| 113 | fifo->count -= (i + index); |
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| 114 | |||
| 115 | return true; |
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| 116 | } |
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| 117 | //-------------------------------------------------------------- |
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| 118 | bool fifo_search (fifo_t * fifo, const char * pgm) |
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| 119 | { |
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| 120 | uint16_t i; |
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| 121 | uint8_t fifo_byte; |
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| 122 | uint8_t pgm_byte; |
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| 123 | |||
| 124 | for (i = 0; pgm_read_byte (pgm + i) != 0; i++) |
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| 125 | { |
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| 126 | if (fifo->count <= i) |
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| 127 | return false; |
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| 128 | |||
| 129 | pgm_byte = pgm_read_byte (pgm + i); |
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| 130 | |||
| 131 | fifo_byte = * (fifo->buffer + ( (fifo->head + i) % fifo->size)); |
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| 132 | |||
| 133 | if (fifo_byte != pgm_byte) |
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| 134 | return false; |
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| 135 | } |
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| 136 | |||
| 137 | // // We found the string, lets move the pointer |
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| 138 | // fifo->head = ( (fifo->head + i + index) % fifo->size); |
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| 139 | // |
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| 140 | // fifo->count -= (i + index); |
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| 141 | |||
| 142 | return true; |
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| 143 | } |
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| 144 | //-------------------------------------------------------------- |
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| 145 | /** \brief searches a string in the whole fifo |
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| 146 | * starts at the beginning and searches for the pgm string in the fifo, |
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| 147 | * |
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| 148 | * @param fifo pointer to your initialized fifo_t structure |
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| 149 | * @param pgm a prog_char with the search string |
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| 150 | * @return true if found, false otherwise |
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| 151 | */ |
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| 152 | |||
| 153 | bool fifo_cmp_pgm (fifo_t * fifo, const char * pgm) |
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| 154 | { |
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| 155 | return fifo_cmp_pgm_at (fifo, pgm, 0); |
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| 156 | } |
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| 157 | //-------------------------------------------------------------- |
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| 158 | /** \brief searches a string in the whole fifo |
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| 159 | * starts at the beginning and searches for the pgm string in the fifo, |
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| 160 | * if they are found previous entrys and the string are removed from the fifo |
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| 161 | * @param fifo pointer to your initialized fifo_t structure |
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| 162 | * @param pgm a prog_char with the search string |
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| 163 | * @return true if found, false otherwise |
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| 164 | */ |
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| 165 | |||
| 166 | bool fifo_strstr_pgm (fifo_t * fifo, const char * pgm) |
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| 167 | { |
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| 168 | for (uint16_t i = 0; i < fifo->count; i++) |
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| 169 | { |
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| 170 | if (fifo_cmp_pgm_at (fifo, pgm, i)) |
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| 171 | return true; |
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| 172 | } |
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| 173 | |||
| 174 | return false; |
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| 175 | } |
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| 176 | |||
| 177 | |||
| 178 | |||
| 179 | //-------------------------------------------------------------- |
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| 180 | // Idee: buffer nach str durchsuchen ohne die fifo Zeiger zu aendern |
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| 181 | // ungetestet |
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| 182 | //-------------------------------------------------------------- |
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| 183 | bool fifo_isstr( fifo_t * fifo, const char * str) |
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| 184 | { |
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| 185 | /* |
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| 186 | void *memmem(const void *s1, |
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| 187 | size_t len1, |
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| 188 | const void *s2, |
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| 189 | size_t len2); |
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| 190 | The memmem() function finds the start of the first occurrence of the substring s2 of length len2 in the memory area s1 of length len1. |
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| 191 | */ |
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| 192 | |||
| 193 | return memmem( fifo->buffer + fifo->head, fifo->count, str, strlen(str) ) != NULL; |
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| 194 | } |
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| 195 | |||
| 196 | |||
| 197 | //#endif |