USART (Universal Synchronous/Asynchronous Transmitter) is a commonly used serial communication interface, while CAN (Controller Area Network) is a communication protocol commonly used in automotive, industrial and embedded systems. This article will introduce how to use USART to send back the data sent by CAN, and help you realize the reception and transmission of CAN data in embedded systems.
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Hardware preparation: Before starting, please make sure you have the following hardware equipment ready:
- A microcontroller or development board that supports USART and CAN functionality.
- CAN transceiver connected to CAN bus.
- A serial communication device, such as a computer or terminal device, connected to the USART.
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Initialize USART and CAN: In the code, first you need to initialize the USART and CAN modules. Depending on the specific hardware and development environment you are using, the initialization process may vary. Generally speaking, you need to set the baud rate, data bits, stop bits and parity mode of the USART. At the same time, you also need to initialize the baud rate, ID filter and interrupt of the CAN module.
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Receive CAN data: When the CAN module receives the data, you can process it in the interrupt handler. Store the received CAN data in a suitable variable and format it into a format suitable for USART transmission (such as string or binary data).
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Data transfer using USART: After receiving CAN data, you can use USART to transmit it back to a computer or terminal device for further processing. Depending on the serial communication protocol and hardware settings you choose, you can send the data in ASCII code, binary data or other formats. Make sure to set the appropriate USART parameters (such as baud rate, number of data bits, etc.), and call the corresponding send function to transfer the data to the USART.
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Receive USART data: On the computer or terminal device, you need to set the corresponding serial communication software (such as Tera Term, PuTTY, etc.) to receive the data sent back by USART. According to the data format and USART parameters you choose, set the correct serial port configuration and open the serial port connection. You can then receive data from the serial port for further processing and analysis.
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Error handling and debugging: In practical applications, some problems may be encountered, such as communication errors, data loss, etc. In order to troubleshoot, you can add proper error handling and debugging in your code, such as checking CAN error flags, USART transmit status and receive buffer status, etc. Through these debugging tools, the source of the problem can be better understood and corrective actions can be taken accordingly.
Conclusion: By understanding the working principle of USART and CAN, and correctly initializing and configuring related hardware and software, you can use USART to transmit data from CAN back. In this way, you can realize the reception and transmission of CAN data in the embedded system, providing more possibilities for your application. Hope the introduction of this article is helpful to you, and realize the data transmission and processing smoothly.