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fix(envea): improve serial read timing and frame detection

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- Increase wait time to 1 second for complete sensor response
- Read all available bytes from buffer instead of fixed 32
- Search for frame header (FF 02) anywhere in response data
  (handles command echo or garbage before actual frame)
- Extract frame from header position for correct byte alignment

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
PaulVua
2026-01-23 17:24:51 +01:00
parent b60f044105
commit 80fcd8bf37
1 changed files with 29 additions and 11 deletions
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40
envea/read_value_v2.py
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@@ -114,18 +114,36 @@ try:
serial_connection.write(command)
debug_print(f" → Sent command: {command.hex()}")
# Wait for sensor response
time.sleep(0.5)
# Wait for complete sensor response (sensor needs time to process and reply)
time.sleep(1.0)
# Read all available data from buffer
bytes_available = serial_connection.in_waiting
debug_print(f" ← Bytes available in buffer: {bytes_available}")
if bytes_available > 0:
data_envea = serial_connection.read(bytes_available)
else:
# Fallback: try reading with timeout
data_envea = serial_connection.read(32)
# Read fixed number of bytes (not readline which stops at 0x0A)
data_envea = serial_connection.read(32) # Read fixed 32 bytes
debug_print(f" ← Received {len(data_envea)} bytes: {data_envea.hex() if data_envea else 'empty'}")
# Validate frame: should start with 0xFF 0x02 and have at least 20 bytes
if len(data_envea) >= 20:
# Check frame header (0xFF 0x02 expected for valid CAIRSENS response)
if data_envea[0] == 0xFF and data_envea[1] == 0x02:
byte_20 = data_envea[19]
# Find frame start (0xFF 0x02) in received data - may have echo/garbage before it
frame_start = -1
for i in range(len(data_envea) - 1):
if data_envea[i] == 0xFF and data_envea[i + 1] == 0x02:
frame_start = i
debug_print(f" → Found frame header at position {i}")
break
if frame_start >= 0:
# Extract frame from header position
frame_data = data_envea[frame_start:]
debug_print(f" → Frame data ({len(frame_data)} bytes): {frame_data.hex()}")
if len(frame_data) >= 20:
byte_20 = frame_data[19]
raw_value = byte_20
calculated_value = byte_20 * coefficient
debug_print(f" → Byte 20 value: {raw_value} (0x{raw_value:02X})")
@@ -146,9 +164,9 @@ try:
debug_print(f" ✓ {name.upper()} = {calculated_value}")
else:
debug_print(f" ✗ Invalid frame header: expected FF 02, got {data_envea[0]:02X} {data_envea[1]:02X}")
debug_print(f" ✗ Frame too short ({len(frame_data)} bytes after header, expected ≥20)")
else:
debug_print(f" ✗ Response too short ({len(data_envea)} bytes, expected ≥20)")
debug_print(f" ✗ No valid frame header (FF 02) found in response")
except serial.SerialException as e:
debug_print(f"✗ Error communicating with {name}: {e}")