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First stab at using real exception handling instead of returning [None] everywhere

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This commit is contained in:
Nick Foster
2012-06-19 15:43:43 -07:00
parent e3ac472a1a
commit db62aaf399
10 changed files with 148 additions and 94 deletions
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24
python/altitude.py
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@@ -23,6 +23,8 @@
# For reference into the methodology used to decode altitude,
# see RTCA DO-181D p.42
from modes_exceptions import *
def decode_alt(alt, bit13):
mbit = alt & 0x0040
qbit = alt & 0x0010
@@ -30,7 +32,7 @@ def decode_alt(alt, bit13):
if mbit and bit13:
#TBD: bits 20-25, 27-31 encode alt in meters
#remember that bits are left justified (bit 20 is MSB)
return "METRIC ERROR"
raise MetricAltError
if qbit: #a mode S-style reply
#bit13 is false for BDS0,5 ADS-B squitters, and is true otherwise
@@ -122,12 +124,14 @@ def encode_alt_modes(alt, bit13):
return (encalt & 0x0F) | tmp1 | tmp2 | (mbit << 6) | (qbit << 4)
if __name__ == "__main__":
for alt in range(-1000, 101400, 25):
dec = decode_alt(encode_alt_modes(alt, False), False)
if dec != alt:
print "Failure at %i with bit13 clear (got %s)" % (alt, dec)
for alt in range(-1000, 101400, 25):
dec = decode_alt(encode_alt_modes(alt, True), True)
if dec != alt:
print "Failure at %i with bit13 set (got %s)" % (alt, dec)
try:
for alt in range(-1000, 101400, 25):
dec = decode_alt(encode_alt_modes(alt, False), False)
if dec != alt:
print "Failure at %i with bit13 clear (got %s)" % (alt, dec)
for alt in range(-1000, 101400, 25):
dec = decode_alt(encode_alt_modes(alt, True), True)
if dec != alt:
print "Failure at %i with bit13 set (got %s)" % (alt, dec)
except MetricAltError:
print "Failure at %i due to metric alt bit" % alt