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Table-ize the Mode A to C conversions, add a Mode C to Mode A conversion function.

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This commit is contained in:
Oliver Jowett 2016-10-11 17:57:25 +01:00
parent 10b5cde505
commit 60f1f3bcb6
7 changed files with 68 additions and 7 deletions
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4
mode_s.c
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@ -134,7 +134,7 @@ static int decodeAC13Field(int AC13Field, altitude_unit_t *unit) {
return ((n * 25) - 1000);
} else {
// N is an 11 bit Gillham coded altitude
int n = ModeAToModeC(decodeID13Field(AC13Field));
int n = modeAToModeC(decodeID13Field(AC13Field));
if (n < -12) {
return INVALID_ALTITUDE;
}
@ -167,7 +167,7 @@ static int decodeAC12Field(int AC12Field, altitude_unit_t *unit) {
// Make N a 13 bit Gillham coded altitude by inserting M=0 at bit 6
int n = ((AC12Field & 0x0FC0) << 1) |
(AC12Field & 0x003F);
n = ModeAToModeC(decodeID13Field(n));
n = modeAToModeC(decodeID13Field(n));
if (n < -12) {
return INVALID_ALTITUDE;
}