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change the saving logic and ensure type b safety with a group structure

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This commit is contained in:
kuba
2025-04-13 15:25:28 +02:00
parent 6c5f8e47d9
commit 7e7f24545c
5 changed files with 167 additions and 241 deletions
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src/lib.c
+18 -6
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@@ -30,6 +30,21 @@ uint16_t crc16_ccitt(char* data, uint16_t len) {
return ((crc ^= 0xFFFF) & 0xFFFF);
}
uint16_t get_block_grom_group(RDSGroup *group, uint8_t block) {
switch (block) {
case 0:
return group->a;
case 1:
return group->b;
case 2:
return group->c;
case 3:
return group->d;
default:
return 0;
}
}
static uint16_t offset_words[] = {
0x0FC, /* A */
0x198, /* B */
@@ -38,20 +53,17 @@ static uint16_t offset_words[] = {
0x350 /* C' */
};
void add_checkwords(uint16_t *blocks, uint8_t *bits, uint8_t stream)
void add_checkwords(RDSGroup *group, uint8_t *bits, uint8_t stream)
{
uint16_t offset_word;
bool group_type_b = IS_TYPE_B(blocks);
bool rds2_tunneling = ((blocks[0] == 0) && (stream != 0));
for (uint8_t i = 0; i < GROUP_LENGTH; i++) {
offset_word = offset_words[i];
if ((i == 2 && group_type_b && stream == 0) ||
(i == 2 && group_type_b && rds2_tunneling)) {
if (i == 2 && group->is_type_b) {
offset_word = offset_words[4];
}
uint16_t block = blocks[i];
uint16_t block = get_block_grom_group(group, i);
uint16_t block_crc = 0;
uint8_t j, bit, msb;