send uint8_t using serialPort.writeData

[Aeroplane123]

Hello,

I am new to this forum. I have a problem when i am using serialPort.writeData i NEED to send data as uint8_t as this is what the receiver expects and I cannot change that at this point.

When i try

  uint8_t cmd[3000];

    memcpy(cmd, "x", 4);
    cmd[4] =  CMD_SENDING_FIRMWARE_PAGE & 0xFF;
    cmd[5] = (CMD_SENDING_FIRMWARE_PAGE << 8) & 0xFF;
    cmd[6] = (uint8_t)(payLoadSize & 0xFF);
    cmd[7] = (uint8_t)(payLoadSize >>8);
    cmd[8] = pageId;

    memcpy(&cmd[9], data, pageSize);`
    cmd[8 + payLoadSize] = CalcChecksum(cmd, cmdSize);

    serialPort.write(cmd, cmdSize + 1);

I get the error: invalid conversion from 'uint8_t* {aka unsigned char*}' to 'const char*' [-fpermissive]

Can anyone please help? The data must be sent as uint8_t

Thanks

[Christian Ehrlicher]

@Aeroplane123 You have to reinterpret_cast<> it to a const char* when passing it to QSerialPort::write()

[Aeroplane123]

Will this keep the data the same for the receiving end?

[jsulm]

@Aeroplane123 said in send uint8_t using serialPort.writeData:

Will this keep the data the same for the receiving end?

Yes, a cast does not change the data, it just tells the compiler how to treat the data.

[JonB]

@Aeroplane123 said in send uint8_t using serialPort.writeData:

cmd[5] = (CMD_SENDING_FIRMWARE_PAGE << 8) & 0xFF;

As a minor point/aside, this is almost certainly incorrect/not what you intend....

[Aeroplane123]

This post is deleted!