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another attempt fixing byteorder bug

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This commit is contained in:
DJ2LS 2023-02-23 10:54:52 +01:00
parent fc5a6d67fc
commit 72f567abfb
1 changed files with 12 additions and 3 deletions
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15
tnc/data_handler.py
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@ -144,6 +144,12 @@ class DATA:
self.speed_level = len(self.mode_list) - 1 # speed level for selecting mode
static.ARQ_SPEED_LEVEL = self.speed_level
# minimum payload for arq burst
# import for avoiding byteorder bug and buffer search area
self.arq_burst_header_size = 3
self.arq_burst_minimum_payload = 126 - self.arq_burst_header_size
self.arq_burst_maximum_payload = 510 - self.arq_burst_header_size
self.is_IRS = False
self.burst_nack = False
self.burst_nack_counter = 0
@ -745,14 +751,17 @@ class DATA:
# data_mode = self.mode_list[self.speed_level]
# payload_per_frame = modem.get_bytes_per_frame(data_mode) - 2
# search_area = payload_per_frame - 3 # (3 bytes arq frame header)
search_area = 510 - 3 # (3 bytes arq frame header)
search_area = self.arq_burst_maximum_payload # (3 bytes arq frame header)
search_position = len(static.RX_FRAME_BUFFER) - search_area
# find position of data. returns -1 if nothing found in area else >= 0
# we are beginning from the end, so if data exists twice or more,
# only the last one should be replaced
# we are going to only check position against minimum data frame payload
# use case: receive data, which already contains received data
# while the payload of data received before is shorter than actual payload
get_position = static.RX_FRAME_BUFFER[search_position:].rfind(
temp_burst_buffer
temp_burst_buffer[:self.arq_burst_minimum_payload]
)
# if we find data, replace it at this position with the new data and strip it
if get_position >= 0:
@ -807,7 +816,7 @@ class DATA:
finished=static.ARQ_SECONDS_UNTIL_FINISH,
irs=helpers.bool_to_string(self.is_IRS)
)
elif rx_n_frame_of_burst == rx_n_frames_per_burst - 1:
# We have "Nones" in our rx buffer,
# Check if we received last frame of burst - this is an indicator for missed frames.