Qt serial port read and write
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wait for device 1 communication process to finish before executing comm process for device 2? Could I end up seeing a huge traffic jam with a lot of devices and using wait conditions, ie. I believe I should Send message to Device 1, receive Device 1 response, Send to Device 2, receive Device 2. It seems that the send is being blocked, how would you recommend I format my sending so that I send after the response is received for the first send? There is only 1 COM port that can be used to send/receive. I never receive any response regarding the second device (Bedroom Light), this is the message that is sent second. HandleResponse function, SLOT which receives response signal Run Function - Handled sending and receiving SetupThread function used to set local thread variables and executes (runs) thread. (Thread modified from QSerialPort BlockingMaster example. If device is desired type ('Light'), then we format the device ID to the intended QByteArray message structure. I have tried many different examples and configurations, currently I am using the following:įunction used to iterate through QList of devices. Now, my problem - I must not have my function setup properly to send and then receive the response bytes. If off, the modem would send back 0x00 in the last byte position if the device was off. The returned message indicates exactly what I would expect, that the device is on. I send the following message to query the state of the device: I have tested my message using DockLight (). The purpose of this example is to demonstrate a. The Terminal example illustrates the asynchronous approach. In this example, the synchronous approach is demonstrated.
#QT SERIAL PORT READ AND WRITE HOW TO#
Blocking Slave shows how to create an application for a serial interface using QSerialPort's synchronous API in a non-GUI thread. For more information, visit Building and Running an Example. To run the examples from Qt Creator, open the Welcome mode and select the example from Examples. The Qt Serial Port module provides the following examples for reference to help understand the API usage. When I send messages to my INSTEON modem (serial), upon reading my message the device sends back a copy of my message + 0x06 (ACK Byte) followed by a status message. I am using the QSerialPort () module to instantiate device IO support. I am sending (writing) bytes to a device via my serial port.