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should make it easier

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This commit is contained in:
kuba
2025-12-23 09:42:37 +01:00
parent d5666133a4
commit aedb265315
6 changed files with 598 additions and 572 deletions
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src/lib.c
-35
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@@ -36,41 +36,6 @@ inline uint16_t get_block_from_group(RDSGroup *group, uint8_t block) {
}
}
static uint16_t offset_words_typea[] = {
0x0FC, /* A */
0x198, /* B */
0x168, /* C */
0x1B4, /* D */
};
static uint16_t offset_words_typeb[] = {
0x0FC, /* A */
0x198, /* B */
0x350, /* C' */
0x1B4, /* D */
};
void add_checkwords(RDSGroup *group, uint8_t *bits)
{
uint16_t* offset_words;
if(group->is_type_b) offset_words = offset_words_typeb;
else offset_words = offset_words_typea;
for (uint8_t i = 0; i < GROUP_LENGTH; i++) {
uint16_t block = get_block_from_group(group, i);
uint16_t block_crc = 0;
uint8_t j;
for (j = 0; j < BLOCK_SIZE; j++) {
uint8_t bit = (block & (0x8000 >> j)) != 0;
uint8_t msb = (block_crc >> (POLY_DEG - 1)) & 1;
block_crc <<= 1;
if (msb ^ bit) block_crc ^= POLY;
*bits++ = bit; // Write the data itself to the bits
}
for (j = 0; j < POLY_DEG; j++) *bits++ = ((block_crc ^ offset_words[i]) >> (POLY_DEG - 1 - j)) & 1; // Write the checkword to the bits
}
}
uint8_t add_rds_af_oda(RDSAFsODA *af_list, float freq) {
uint16_t af;