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fix crc extensions checking

This commit is contained in:
King Kévin 2022-12-07 11:18:18 +01:00
parent 7ba053d34f
commit 8bc856095e
1 changed files with 9 additions and 7 deletions
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16
main.c
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@ -136,19 +136,21 @@ static uint16_t edid_length(const uint8_t* edid)
if (1 == edid[18]) { // EDID 1.3/1.4 128-byte structure
if (checksum_ok(&edid[0], 128)) { // ensure checksum of base EDID is ok
const uint16_t length = 128 + (1 + edid[126]) * 128; // get length with all extensions
puts("(v1.4 ");
const uint16_t length = 128 + edid[126] * 128; // get length with all extensions
puts("(v1.3/1.4, ");
putn(edid[126] / 100);
putn((edid[126] / 10) % 10);
putn(edid[126] % 10);
puts(" extension) ");
for (uint16_t i = 128; i < length && i < 256; i += 128) { // verify checksum of each extension (we actually only support one extension)
if (!checksum_ok(&edid[i], 128)) {
puts("extension CRC error\r\n");
return 0; // EDID is broken
if (edid[126]) { // extensions are present
for (uint16_t i = 128; i < length && i < 256; i += 128) { // verify checksum of each extension (we actually only support one extension)
if (!checksum_ok(&edid[i], 128)) {
puts("extension CRC error\r\n");
return 0; // EDID is broken
}
}
}
puts("CRC ok\r\n");
puts("CRC OK\r\n");
return length;
} else {
puts("base CRC error\r\n");