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adding support for SET_I2C_ADDRESS #1

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adding support for SET_I2C_ADDRESS #1

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e0b156d
adding support for SET_I2C_ADDRESS
dylantubular Nov 23, 2023
25e9e9f
Fixing error state and some cleanup
dylantubular Nov 24, 2023
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28 changes: 20 additions & 8 deletions src/tfmpi2c/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,9 @@ def begin( portNumber, devAddress):
TFMP_FLOOD = 12 # Ambient Light saturation
TFMP_MEASURE = 13

# Local Error Codes, starting at 50 to separate from the system codes above
TFMP_NOPARAM = 50 # Required param missing from sendCommand call

'''- - - - - - TFMini Plus data formats - - - - - - - - -
Data Frame format:
Byte0 Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8
Expand Down Expand Up @@ -250,7 +253,7 @@ def getData():
#
# Create a proper command byte array, send the command,
# get a response, and return the status
def sendCommand( cmnd, param):
def sendCommand( cmnd, param=None):
''' Send command and get reply data'''

# - - - - - - - - - - - - - - - - - - - - - - - - -
Expand All @@ -273,12 +276,20 @@ def sendCommand( cmnd, param):
cmndLen = cmndData[ 1] # Save the second byte as command length.
cmndData[ 0] = 0x5A # Set the first byte to the HEADER code.
#

# check that param is not none if the cmd expects input
if cmnd in [ SET_BAUD_RATE, SET_FRAME_RATE, SET_I2C_ADDRESS] and not param:
status = TFMP_NOPARAM
return False

if( cmnd == SET_FRAME_RATE): # If the command is Set FrameRate...
cmndData[3:2] = param.to_bytes( 2, byteorder = 'little') # add the 2 byte FrameRate parameter.
cmndData[ 3:2] = param.to_bytes( 2, byteorder = 'little') # add the 2 byte FrameRate parameter.
elif( cmnd == SET_BAUD_RATE): # If the command is Set BaudRate...
cmndData[3:3] = param.to_bytes( 3, byteorder = 'little') # add the 3 byte BaudRate parameter.
cmndData[ 3:3] = param.to_bytes( 3, byteorder = 'little') # add the 3 byte BaudRate parameter.
elif( cmnd == SET_I2C_ADDRESS):
cmndData[ 3:1] = param.to_bytes( 1, byteorder = 'little') # add the 3 byte BaudRate parameter.
#
cmndData = cmndData[0:cmndLen] # re-establish length of command data array
cmndData = cmndData[ 0:cmndLen] # re-establish length of command data array
#
# Create a checksum for the last byte of the array
# (Tests indicate the presence of the byte is
Expand All @@ -294,7 +305,7 @@ def sendCommand( cmnd, param):
# - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Step 2 - Send the command data array to the device
# - - - - - - - - - - - - - - - - - - - - - - - - - - - -
cmndList = list(cmndData)
cmndList = list( cmndData)
bus = SMBus( port)
bus.write_i2c_block_data( addr, 0, cmndList)
bus.close()
Expand All @@ -309,7 +320,7 @@ def sendCommand( cmnd, param):
# Step 3 - Get command reply data back from the device.
# - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Give device a chance to fill its registers
time.sleep(0.002)
time.sleep( 0.002)
# Read block of data into declared list 'reply'
bus = SMBus( port)
reply = bus.read_i2c_block_data( addr, 0, replyLen)
Expand All @@ -332,7 +343,7 @@ def sendCommand( cmnd, param):
for i in range( replyLen -1):
chkSum += reply[ i]
# If the low order byte does not equal the last byte...
if( ( chkSum & 0xff) != reply[ replyLen - 1]):
if(( chkSum & 0xff) != reply[ replyLen -1]):
status = TFMP_CHECKSUM # ...then set error
return False # and return 'False.'

Expand All @@ -347,7 +358,7 @@ def sendCommand( cmnd, param):
else:
if( cmnd == SYSTEM_RESET or
cmnd == RESTORE_FACTORY_SETTINGS or
cmnd == SAVE_SETTINGS ):
cmnd == SAVE_SETTINGS):
if( reply[ 3] == 1): # If PASS/FAIL byte non-zero
status = TFMP_FAIL # then set status to 'FAIL'
return False # and return 'False'.
Expand Down Expand Up @@ -383,6 +394,7 @@ def printStatus():
elif( status == TFMP_WEAK): print( "Signal weak", end= '')
elif( status == TFMP_STRONG): print( "Signal saturation", end= '')
elif( status == TFMP_FLOOD): print( "Ambient light saturation", end= '')
elif( status == TFMP_NOPARAM): print( "Required parameter missing", end= '')
else: print( "OTHER", end= '')
print()
#
Expand Down