Getting CFG-PRT to change UART speed

n8ur commented 1 year ago

Hi --

I'm trying to change the baud rate of a NEO-6M and finding that no matter what I do the baud rate change doesn't take -- it ACKs the command, but still talks at the old speed, and if I poll CFG-PRT afterwards it still reports the old speed. I've also tried this on a NEO-M8 where I'm communicating by USB but commanded to change the UART1 speed, and had the same result -- an ACK but no speed change reported.

I originally tried creating a CFG-PRT message with only the portID and baudRate fields set: cmd = UBXMessage('CFG','CFG-PRT',SET,portID=1,baudRate=setbaud). When that didn't work, I polled CFG-PRT with parsebitfield=False, then copied the resulting fields into a new SET message with only the baudRate field changed. That did not change the speed, either.

I'd like to avoid cut-pasting a byte object as ultimately I'd like to have flexibility in changing the port params. I'd appreciate any suggestions about what I might be doing wrong.

Thanks!

semuadmin commented 1 year ago

Hi @n8ur

Can you post the entire Python script you're using please, and ideally a log of the receiver output?

How are you connecting to the NEO-6M? Are you definitely sending a SET command, as opposed to a GET poll?

By way of illustration, here is a log of a sequence of CFG-PRT command I've just sent to a u-blox receiver via USB. Here I'm changing the baud rates on UART1 and UART2 (portID 1 and 2) to 115200 and 57600 respectively, from the default 38400. You can see the CFG-PRT poll responses showing the original baud rates, the ACK-ACK response to the CFG-PRT update command, and the subsequent CFG-PRT poll responses showing the updated baud rates.

As you can see, it all works fine.

Here is the Python script with the update (SET) commands:

Bear in mind that any attribute keywords you don't set explicitly default to 0 - this includes for example charLen, parity and inUBX. So you need to set these attributes explicitly.

from serial import Serial
from pyubx2 import UBXMessage, SET, POLL

with Serial("/dev/tty.usbmodem1101", 9600, timeout=3) as stream: # USB

    # UART1
    uart1poll = UBXMessage("CFG", "CFG-PRT", POLL, portID=1)
    uart1set = UBXMessage(
        "CFG",
        "CFG-PRT",
        SET,
        portID=1,
        enable=0,
        pol=0,
        pin=0,
        thres=0,
        charLen=3,
        parity=4,
        nStopBits=0,
        baudRate=115200,
        inUBX=1,
        inNMEA=1,
        outUBX=1,
        outNMEA=1,
        extendedTxTimeout=0,
    )
    print(uart1set)
    print(uart1set.serialize())

    # UART2
    uart2poll = UBXMessage("CFG", "CFG-PRT", POLL, portID=2)
    uart2set = UBXMessage(
        "CFG",
        "CFG-PRT",
        SET,
        portID=2,
        enable=0,
        pol=0,
        pin=0,
        thres=0,
        charLen=3,
        parity=4,
        nStopBits=0,
        baudRate=57600,
        inUBX=1,
        inNMEA=1,
        outUBX=1,
        outNMEA=1,
        extendedTxTimeout=0,
    )
    print(uart2set)
    print(uart2set.serialize())

    stream.write(uart1poll.serialize())  # poll before
    stream.write(uart1set.serialize())  # updating...
    stream.write(uart1poll.serialize())  # poll after
    stream.write(uart2poll.serialize())  # poll before
    stream.write(uart2set.serialize())  # updating..
    stream.write(uart2poll.serialize())  # poll after

And here is the log output:

<UBX(CFG-PRT, portID=1, reserved0=0, enable=0, pol=0, pin=0, thres=0, charLen=3, parity=4, nStopBits=0, baudRate=38400, inUBX=1, inNMEA=1, inRTCM=0, inRTCM3=1, outUBX=1, outNMEA=1, outRTCM3=1, extendedTxTimeout=0, reserved1=0)>
000: b562 0600 1400 0100 0000 c008 0000 0096  | b'\xb5b\x06\x00\x14\x00\x01\x00\x00\x00\xc0\x08\x00\x00\x00\x96' |
016: 0000 6300 2300 0000 0000 ff30            | b'\x00\x00c\x00#\x00\x00\x00\x00\x00\xff0' |

<UBX(ACK-ACK, clsID=CFG, msgID=CFG-PRT)>
000: b562 0501 0200 0600 0e37                 | b'\xb5b\x05\x01\x02\x00\x06\x00\x0e7' |

<UBX(ACK-ACK, clsID=CFG, msgID=CFG-PRT)>
000: b562 0501 0200 0600 0e37                 | b'\xb5b\x05\x01\x02\x00\x06\x00\x0e7' |

<UBX(CFG-PRT, portID=1, reserved0=0, enable=0, pol=0, pin=0, thres=0, charLen=3, parity=4, nStopBits=0, baudRate=115200, inUBX=1, inNMEA=1, inRTCM=0, inRTCM3=1, outUBX=1, outNMEA=1, outRTCM3=1, extendedTxTimeout=0, reserved1=0)>
000: b562 0600 1400 0100 0000 c008 0000 00c2  | b'\xb5b\x06\x00\x14\x00\x01\x00\x00\x00\xc0\x08\x00\x00\x00\xc2' |
016: 0100 2300 2300 0000 0000 ec1e            | b'\x01\x00#\x00#\x00\x00\x00\x00\x00\xec\x1e' |

<UBX(ACK-ACK, clsID=CFG, msgID=CFG-PRT)>
000: b562 0501 0200 0600 0e37                 | b'\xb5b\x05\x01\x02\x00\x06\x00\x0e7' |

<UBX(CFG-PRT, portID=2, reserved0=0, enable=0, pol=0, pin=0, thres=0, charLen=3, parity=4, nStopBits=0, baudRate=38400, inUBX=1, inNMEA=0, inRTCM=0, inRTCM3=1, outUBX=0, outNMEA=0, outRTCM3=1, extendedTxTimeout=0, reserved1=0)>
000: b562 0600 1400 0200 0000 c008 0000 0096  | b'\xb5b\x06\x00\x14\x00\x02\x00\x00\x00\xc0\x08\x00\x00\x00\x96' |
016: 0000 6100 2000 0000 0000 fb22            | b'\x00\x00a\x00 \x00\x00\x00\x00\x00\xfb"' |

<UBX(ACK-ACK, clsID=CFG, msgID=CFG-PRT)>
000: b562 0501 0200 0600 0e37                 | b'\xb5b\x05\x01\x02\x00\x06\x00\x0e7' |

<UBX(ACK-ACK, clsID=CFG, msgID=CFG-PRT)>
000: b562 0501 0200 0600 0e37                 | b'\xb5b\x05\x01\x02\x00\x06\x00\x0e7' |

<UBX(CFG-PRT, portID=2, reserved0=0, enable=0, pol=0, pin=0, thres=0, charLen=3, parity=4, nStopBits=0, baudRate=57600, inUBX=1, inNMEA=0, inRTCM=0, inRTCM3=1, outUBX=0, outNMEA=0, outRTCM3=1, extendedTxTimeout=0, reserved1=0)>
000: b562 0600 1400 0200 0000 c008 0000 00e1  | b'\xb5b\x06\x00\x14\x00\x02\x00\x00\x00\xc0\x08\x00\x00\x00\xe1' |
016: 0000 2100 2000 0000 0000 065b            | b'\x00\x00!\x00 \x00\x00\x00\x00\x00\x06[' |

<UBX(ACK-ACK, clsID=CFG, msgID=CFG-PRT)>
000: b562 0501 0200 0600 0e37                 | b'\xb5b\x05\x01\x02\x00\x06\x00\x0e7' |

n8ur commented 1 year ago

Thanks for getting back! My problem probably is that I wasn't explicitly setting all the values; I wasn't sure whether that was required. I will try fixing that, and if it doesn't work I'll extract a script that duplicates my problems (it's a multi-module with lots of other constellation-setting, etc. stuff but I can pull out a standalone baud test if needed). I will let you know if setting all the params solves the problem; I bet it does. If not I'll upload script and log file. Thanks again!

semuadmin commented 1 year ago

You may have to reset or power cycle the device first, as setting inUBX to 0 will effectively block incoming UBX commands on that port.

-- semuadmin SEMU Consulting https://github.com/semuconsulting

From: John Ackermann N8UR @.> Sent: Sunday, January 29, 2023 2:46:02 PM To: semuconsulting/pyubx2 @.> Cc: semuadmin @.>; Assign @.> Subject: Re: [semuconsulting/pyubx2] Getting CFG-PRT to change UART speed (Issue #101)

Thanks for getting back! My problem probably is that I wasn't explicitly setting all the values; I wasn't sure whether that was required. I will try fixing that, and if it doesn't work I'll extract a script that duplicates my problems (it's a multi-module with lots of other constellation-setting, etc. stuff but I can pull out a standalone baud test if needed). I will let you know if setting all the params solves the problem; I bet it does. If not I'll upload script and log file. Thanks again!

— Reply to this email directly, view it on GitHubhttps://github.com/semuconsulting/pyubx2/issues/101#issuecomment-1407682984, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AGZ7C33BUNNZK4FGTJHYKMTWUZ7CVANCNFSM6AAAAAAUJ3MD64. You are receiving this because you were assigned.Message ID: @.***>

n8ur commented 1 year ago

It looks like it was the lack of setting all the fields explicitly that messed me up. I tried something like that when I tried to copy the fields from polling,parsing with parsebitfields=False, then putting those fields into a SET message but most have messed something up in the process. Setting the parsed bitfields explicitly rather than unparsed fixed whatever I had wrong.

Thanks for the help, and you can close this. Your support of this library is really great!

n8ur commented 1 year ago

I haven't encountered that (yet), but thanks for letting me know. I'll make sure that inUBX remains set in the message. I can also do a warm reset if necessary.

On 1/29/23 10:06, SEMU Admin wrote:

You may have to reset or power cycle the device first, as setting inUBX to 0 will effectively block incoming UBX commands on that port.

-- semuadmin SEMU Consulting https://github.com/semuconsulting

From: John Ackermann N8UR @.> Sent: Sunday, January 29, 2023 2:46:02 PM To: semuconsulting/pyubx2 @.> Cc: semuadmin @.>; Assign @.> Subject: Re: [semuconsulting/pyubx2] Getting CFG-PRT to change UART speed (Issue #101)

Thanks for getting back! My problem probably is that I wasn't explicitly setting all the values; I wasn't sure whether that was required. I will try fixing that, and if it doesn't work I'll extract a script that duplicates my problems (it's a multi-module with lots of other constellation-setting, etc. stuff but I can pull out a standalone baud test if needed). I will let you know if setting all the params solves the problem; I bet it does. If not I'll upload script and log file. Thanks again!

— Reply to this email directly, view it on GitHubhttps://github.com/semuconsulting/pyubx2/issues/101#issuecomment-1407682984, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AGZ7C33BUNNZK4FGTJHYKMTWUZ7CVANCNFSM6AAAAAAUJ3MD64. You are receiving this because you were assigned.Message ID: @.***>

— Reply to this email directly, view it on GitHub https://github.com/semuconsulting/pyubx2/issues/101#issuecomment-1407687874, or unsubscribe https://github.com/notifications/unsubscribe-auth/ADNCPP6OJRDJ4TX6LEMZFKDWU2BPPANCNFSM6AAAAAAUJ3MD64. You are receiving this because you were mentioned.Message ID: @.***>

semuadmin commented 1 year ago

OK glad it's sorted. I'll close this now.

semuconsulting / pyubx2

Getting CFG-PRT to change UART speed #101