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authorVadim Yanitskiy <axilirator@gmail.com>2018-02-28 15:38:27 +0700
committerVadim Yanitskiy <axilirator@gmail.com>2018-02-28 22:33:35 +0700
commit9fc30a4102a46866d88b84b6640372cb09ddf32e (patch)
treea848605cc8658f245db2537c2e22aa1b312d6bf9
parentcbd3d76df9d7e78f7f2010a6cf1c12279fe6acb3 (diff)
fake_trx/data_msg.py: use integer math for ToA
In order to avoid both float arithmetic as well as loosing any precision, let's use integer math fot ToA (Timing of Arrival), i.e. let's express ToA values in units of 1/256 symbol periods. Change-Id: I56b88740f4d782ac7591fc096d1969514784a4e1
-rw-r--r--src/target/fake_trx/burst_fwd.py12
-rwxr-xr-xsrc/target/fake_trx/burst_gen.py14
-rwxr-xr-xsrc/target/fake_trx/burst_send.py4
-rw-r--r--src/target/fake_trx/data_dump.py22
-rw-r--r--src/target/fake_trx/data_msg.py40
5 files changed, 47 insertions, 45 deletions
diff --git a/src/target/fake_trx/burst_fwd.py b/src/target/fake_trx/burst_fwd.py
index db0b05b..4a0e9bb 100644
--- a/src/target/fake_trx/burst_fwd.py
+++ b/src/target/fake_trx/burst_fwd.py
@@ -41,8 +41,8 @@ class BurstForwarder:
RSSI_RAND_MAX = -60
# TODO: add options to change this
- TOA_RAND_TRESHOLD = 0.3
- TOA_RAND_BASE = 0.00
+ TOA256_RAND_TRESHOLD = 128
+ TOA256_RAND_BASE = 0
def __init__(self, bts_link, bb_link):
self.bts_link = bts_link
@@ -54,8 +54,8 @@ class BurstForwarder:
self.rssi_max = rssi + self.RSSI_RAND_TRESHOLD
# Generate a random ToA range
- self.toa_min = self.TOA_RAND_BASE - self.TOA_RAND_TRESHOLD
- self.toa_max = self.TOA_RAND_BASE + self.TOA_RAND_TRESHOLD
+ self.toa256_min = self.TOA256_RAND_BASE - self.TOA256_RAND_TRESHOLD
+ self.toa256_max = self.TOA256_RAND_BASE + self.TOA256_RAND_TRESHOLD
# Converts a L12TRX message to TRX2L1 message
def transform_msg(self, msg_raw):
@@ -73,8 +73,8 @@ class BurstForwarder:
# Randomize both RSSI and ToA values
msg_trx2l1.rssi = msg_trx2l1.rand_rssi(
min = self.rssi_min, max = self.rssi_max)
- msg_trx2l1.toa = msg_trx2l1.rand_toa(
- min = self.toa_min, max = self.toa_max)
+ msg_trx2l1.toa256 = msg_trx2l1.rand_toa256(
+ min = self.toa256_min, max = self.toa256_max)
return msg_trx2l1
diff --git a/src/target/fake_trx/burst_gen.py b/src/target/fake_trx/burst_gen.py
index c2e1ad2..179dbcd 100755
--- a/src/target/fake_trx/burst_gen.py
+++ b/src/target/fake_trx/burst_gen.py
@@ -54,8 +54,8 @@ class Application:
tn = None
# Message specific header fields
+ toa256 = None
rssi = None
- toa = None
pwr = None
def __init__(self):
@@ -108,8 +108,8 @@ class Application:
msg.pwr = self.pwr
# Set time of arrival
- if self.toa is not None:
- msg.toa = self.toa
+ if self.toa256 is not None:
+ msg.toa256 = self.toa256
# Set RSSI
if self.rssi is not None:
@@ -164,7 +164,8 @@ class Application:
" -t --timeslot Set timeslot index (default random)\n" \
" --pwr Set power level (default random)\n" \
" --rssi Set RSSI (default random)\n" \
- " --toa Set TOA (default random)\n\n"
+ " --toa Set ToA in symbols (default random)\n" \
+ " --toa256 Set ToA in 1/256 symbol periods\n"
print(s % (self.remote_addr, self.base_port))
@@ -187,6 +188,7 @@ class Application:
"timeslot=",
"rssi=",
"toa=",
+ "toa256=",
"pwr=",
])
except getopt.GetoptError as err:
@@ -221,8 +223,10 @@ class Application:
self.pwr = int(v)
elif o == "--rssi":
self.rssi = int(v)
+ elif o == "--toa256":
+ self.toa256 = int(v)
elif o == "--toa":
- self.toa = float(v)
+ self.toa256 = int(float(v) * 256.0 + 0.5)
def check_argv(self):
# Check connection mode
diff --git a/src/target/fake_trx/burst_send.py b/src/target/fake_trx/burst_send.py
index 61a526f..d6c5c0c 100755
--- a/src/target/fake_trx/burst_send.py
+++ b/src/target/fake_trx/burst_send.py
@@ -91,8 +91,8 @@ class Application:
continue
# HACK: as ToA parsing is not implemented yet,
- # we have to use a fixed 0.00 value for now...
- msg.toa = 0.00
+ # we have to use a fixed value for now...
+ msg.toa256 = 0
print("[i] Sending a burst %s to %s..."
% (msg.desc_hdr(), self.conn_mode))
diff --git a/src/target/fake_trx/data_dump.py b/src/target/fake_trx/data_dump.py
index 6102dc5..5e16da8 100644
--- a/src/target/fake_trx/data_dump.py
+++ b/src/target/fake_trx/data_dump.py
@@ -258,9 +258,9 @@ if __name__ == '__main__':
msg.rand_hdr()
# HACK: as ToA parsing is not implemented yet,
- # we have to use a fixed 0.00 value for now...
+ # we have to use a fixed value for now...
if isinstance(msg, DATAMSG_TRX2L1):
- msg.toa = 0.00
+ msg.toa256 = 0
# Append
messages_ref.append(msg)
@@ -294,8 +294,8 @@ if __name__ == '__main__':
assert(messages_check[i].tn == messages_ref[i].tn)
# HACK: as ToA parsing is not implemented yet,
- # we have to use a fixed 0.00 value for now...
- messages_check[i].toa = 0.00
+ # we have to use a fixed value for now...
+ messages_check[i].toa256 = 0
# Validate a message
assert(messages_check[i].validate())
@@ -320,8 +320,8 @@ if __name__ == '__main__':
assert(messages_check[i].tn == messages_ref[i].tn)
# HACK: as ToA parsing is not implemented yet,
- # we have to use a fixed 0.00 value for now...
- messages_check[i].toa = 0.00
+ # we have to use a fixed value for now...
+ messages_check[i].toa256 = 0
# Validate a message
assert(messages_check[i].validate())
@@ -346,9 +346,9 @@ if __name__ == '__main__':
assert(msg10.tn == messages_ref[10].tn)
# HACK: as ToA parsing is not implemented yet,
- # we have to use a fixed 0.00 value for now...
- msg0.toa = 0.00
- msg10.toa = 0.00
+ # we have to use a fixed value for now...
+ msg0.toa256 = 0
+ msg10.toa256 = 0
# Validate both messages
assert(msg0.validate())
@@ -373,8 +373,8 @@ if __name__ == '__main__':
assert(messages_check[i].tn == messages_ref[i + 10].tn)
# HACK: as ToA parsing is not implemented yet,
- # we have to use a fixed 0.00 value for now...
- messages_check[i].toa = 0.00
+ # we have to use a fixed value for now...
+ messages_check[i].toa256 = 0
# Validate a message
assert(messages_check[i].validate())
diff --git a/src/target/fake_trx/data_msg.py b/src/target/fake_trx/data_msg.py
index 045e281..5dbebcf 100644
--- a/src/target/fake_trx/data_msg.py
+++ b/src/target/fake_trx/data_msg.py
@@ -303,12 +303,12 @@ class DATAMSG_TRX2L1(DATAMSG):
RSSI_MAX = -50
# TODO: verify this range
- TOA_MIN = -10.0
- TOA_MAX = 10.0
+ TOA256_MIN = -256 * 10
+ TOA256_MAX = 256 * 10
# Specific message fields
rssi = None
- toa = None
+ toa256 = None
# Validates the message fields
def validate(self):
@@ -322,10 +322,10 @@ class DATAMSG_TRX2L1(DATAMSG):
if self.rssi < self.RSSI_MIN or self.rssi > self.RSSI_MAX:
return False
- if self.toa is None:
+ if self.toa256 is None:
return False
- if self.toa < self.TOA_MIN or self.toa > self.TOA_MAX:
+ if self.toa256 < self.TOA256_MIN or self.toa256 > self.TOA256_MAX:
return False
return True
@@ -341,20 +341,20 @@ class DATAMSG_TRX2L1(DATAMSG):
return random.randint(min, max)
# Generates a ToA (Time of Arrival) value
- def rand_toa(self, min = None, max = None):
+ def rand_toa256(self, min = None, max = None):
if min is None:
- min = self.TOA_MIN
+ min = self.TOA256_MIN
if max is None:
- max = self.TOA_MAX
+ max = self.TOA256_MAX
- return random.uniform(min, max)
+ return random.randint(min, max)
# Randomizes message specific header
def rand_hdr(self):
DATAMSG.rand_hdr(self)
self.rssi = self.rand_rssi()
- self.toa = self.rand_toa()
+ self.toa256 = self.rand_toa256()
# Generates human-readable header description
def desc_hdr(self):
@@ -364,8 +364,8 @@ class DATAMSG_TRX2L1(DATAMSG):
if self.rssi is not None:
result += ("rssi=%d " % self.rssi)
- if self.toa is not None:
- result += ("toa=%.2f " % self.toa)
+ if self.toa256 is not None:
+ result += ("toa256=%d " % self.toa256)
# Strip useless whitespace and return
return result.strip()
@@ -378,12 +378,10 @@ class DATAMSG_TRX2L1(DATAMSG):
# Put RSSI
buf.append(-self.rssi)
- # Round ToA (Time of Arrival) to closest integer
- toa = int(self.toa * 256.0 + 0.5)
-
- # Encode ToA
- buf.append((toa >> 8) & 0xff)
- buf.append(toa & 0xff)
+ # Encode ToA (Time of Arrival)
+ # Big endian, 2 bytes (int32_t)
+ buf.append((self.toa256 >> 8) & 0xff)
+ buf.append(self.toa256 & 0xff)
return buf
@@ -394,7 +392,7 @@ class DATAMSG_TRX2L1(DATAMSG):
# Parse ToA (Time of Arrival)
# FIXME: parsing unsupported
- self.toa = None
+ self.toa256 = None
# Generates message specific burst
def gen_burst(self):
@@ -457,7 +455,7 @@ if __name__ == '__main__':
# Fill in message specific fields
msg_trx2l1_ref.rssi = -88
msg_l12trx_ref.pwr = 0x33
- msg_trx2l1_ref.toa = -0.6
+ msg_trx2l1_ref.toa256 = -256
# Specify the reference bursts
msg_l12trx_ref.burst = burst_l12trx_ref
@@ -498,7 +496,7 @@ if __name__ == '__main__':
assert(msg_l12trx_dec.pwr == msg_l12trx_ref.pwr)
# FIXME: ToA check disabled until the parsing is implemented
- # assert(msg_trx2l1_dec.toa == msg_trx2l1_ref.toa)
+ # assert(msg_trx2l1_dec.toa256 == msg_trx2l1_ref.toa256)
print("[?] Compare message specific data: OK")