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Use INVALID_ALTITUDE in a few more places.

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This commit is contained in:
Oliver Jowett 2016-08-26 21:38:06 +01:00
parent 08c14484cd
commit 8b8f8d7a40
3 changed files with 11 additions and 9 deletions
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16
mode_ac.c
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@ -35,13 +35,14 @@
// Input format is : 00:A4:A2:A1:00:B4:B2:B1:00:C4:C2:C1:00:D4:D2:D1
//
int ModeAToModeC(unsigned int ModeA)
{
{
unsigned int FiveHundreds = 0;
unsigned int OneHundreds = 0;
if ( (ModeA & 0xFFFF8889) // check zero bits are zero, D1 set is illegal
|| ((ModeA & 0x000000F0) == 0) ) // C1,,C4 cannot be Zero
{return -9999;}
if ((ModeA & 0xFFFF8889) != 0 || // check zero bits are zero, D1 set is illegal
(ModeA & 0x000000F0) == 0) { // C1,,C4 cannot be Zero
return INVALID_ALTITUDE;
}
if (ModeA & 0x0010) {OneHundreds ^= 0x007;} // C1
if (ModeA & 0x0020) {OneHundreds ^= 0x003;} // C2
@ -51,8 +52,9 @@ int ModeAToModeC(unsigned int ModeA)
if ((OneHundreds & 5) == 5) {OneHundreds ^= 2;}
// Check for invalid codes, only 1 to 5 are valid
if (OneHundreds > 5)
{return -9999;}
if (OneHundreds > 5) {
return INVALID_ALTITUDE;
}
//if (ModeA & 0x0001) {FiveHundreds ^= 0x1FF;} // D1 never used for altitude
if (ModeA & 0x0002) {FiveHundreds ^= 0x0FF;} // D2
@ -70,7 +72,7 @@ int ModeAToModeC(unsigned int ModeA)
if (FiveHundreds & 1) {OneHundreds = 6 - OneHundreds;}
return ((FiveHundreds * 5) + OneHundreds - 13);
}
}
//
//=========================================================================
//