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main: limit stored EEPROM to 1 extension

This commit is contained in:
King Kévin 2022-08-05 12:45:30 +02:00
parent f486521126
commit 2f0ffb9c5a
1 changed files with 13 additions and 6 deletions
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19
main.c
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@ -164,6 +164,12 @@ static void edid_modify(uint8_t* edid)
{
// modify EDID to include the character indicating the firewall
const char firewall_indicator = '|'; // pipe/wall character to indicate the firewall
// ensure we only have up to one extension
if (edid[126] > 1) {
edid[126] = 1;
}
// ensure descriptor 4 is for Display name
if ((0 == edid[108]) && (0 == edid[109]) && (0 == edid[110]) && (0xfc == edid[111]) && (0 == edid[112])) { // ensure descriptor 4 is for Display name
uint8_t last_c; // position of last character
@ -179,14 +185,15 @@ static void edid_modify(uint8_t* edid)
while (last_c < 126) {
edid[last_c++] = ' '; // insert padding space
}
// calculate new checksum
uint8_t checksum = 0;
for (uint8_t i = 0; i < 127; i++) {
checksum += edid[i];
}
edid[127] = (256 - checksum);
}
}
// calculate new checksum
uint8_t checksum = 0;
for (uint8_t i = 0; i < 127; i++) {
checksum += edid[i];
}
edid[127] = (256 - checksum);
}
void main(void)