send message with Peak can bus

jsulm

@Rossano said in send message with Peak can bus:

device->connectDevice();

You should check what this returns.
If it returns false check what https://doc.qt.io/qt-5/qcanbusdevice.html#errorString tells you.

Rossano

Hello Jsulm, the system compiles regularly and "frameWritten" return true.

jsulm

@Rossano I'm not talking about compilation. Also how is frameWritten related to device->connectDevice()?
Please check what device->connectDevice() returns (true or false?). If it returns false check what https://doc.qt.io/qt-5/qcanbusdevice.html#errorString returns.

Pablo J. Rogina

@Rossano have you tried this example?
Just to check that your CAN device can be used by Qt

MrShawn

does this work?

#QCanBusFrame roxFrame;
#roxFrame.setFrameId(canID);
#roxFrame.setFrameType(QCanBusFrame::DataFrame);
QByteArray payload;

payload[0] = 0xA4;
payload[1] = 0x00;
payload[2] = 0x90;
payload[3] = 0x01;
payload[4] = 0xFF;
payload[5] = 0xFF;
payload[6] = 0xFF;
payload[7] = 0xFF;

frameWritten = device->writeFrame(canID, payload);

Rossano

Hi jsulm thank you, I tried to do as you advised, and the statement "connected = device-> connectDevice ()" returns true (1)

Rossano

Hi Pablo, I tried to write the array as you indicated (without round brackets), but it gives me compile error -> C: \ Users \ tre-ros \ Documents \ Rox6Aconsole \ main.cpp: 73: error: invalid types' < unresolved overloaded function type> [int] 'for array subscript
73 | payload.data [0] = 0xA4;

Rossano

could it be that in QByteArray some formatting characters need to be deleted? I say this because my array must have eight clean bytes

Pablo J. Rogina

@Rossano said in send message with Peak can bus:

Hi Pablo, I tried to write the array as you indicated

Just in case, I suggested to run the Qt CAN example...

Rossano

Thanks Pablo, with "CAN Bus example" it works. Now I have to understand why my code doesn't work