1. Check whether the serial port is available. You can send data to a serial port, such as com 1, echolyjie126 >; /dev/ttyS0
2. Use ls-l/dev/ttyS* to check the serial name. Generally speaking, the serial name is under dev. If there is no external serial card, the default is ttyS* under dev. Generally, ttyS0 corresponds to com 1, and ttyS 1 corresponds to com2, which is not necessarily inevitable.
3. Check the serial driver: cat/proc/tty/drivers/serial.
4. Check the serial device: dmesg | greptys *
How to define RX and TX in serial assistant?
RX represents the number of bytes received. RX represents the number of bytes sent. TX is actually the abbreviation of Transmit, which is the abbreviation of computer communication. When not reset, these two values are always accumulated.
How does the upper computer labview receive the data from the lower computer through the serial port and process it?
Method 1: find an instrument (oscilloscope, daq) to analyze the reading level sequence by itself; Method 2: find an i2c conversion chip to convert it into a serial port or usb or provide a dll by the chip. Method 3: get a single chip microcomputer to write down the analysis time sequence and then transmit it to the computer through the serial port. Method 4: Find a host with i2c module and call win_api(Linux doesn't know) R.
Linux looking for serial port?
1, the device entrance can check /dev/ttyS*, /dev/*uart* (main device number 4 or 204), the first serial port is usually ttyS0, *uart0 and other USB to serial port /proc/ devices are generally /dev/ttyUSB* (main device number 188), the first. 3. The serial port is a communication port. If there are multiple serial port devices, you need to check which serial port is connected, such as cat/dev/ttys0.
How to debug serial port to send hexadecimal data under linux?
Serial port, of course.
The hardware circuit of the serial port is simple, basically does not need any drivers and software, and can provide debugging information at various stages of hardware loading (such as debugging information at bootloader or Linux kernel startup stage) as needed.
However, the hardware design of Ethernet interface is complicated from the beginning, and the software also needs the support of driver and protocol stack, so it is often necessary to wait until the system starts to work normally before providing debugging information.
In terms of flexibility, there is actually little difference between the two, and the serial port only needs a USB to serial port line. In addition, because there are multiple usb ports on the computer, you can connect multiple devices for debugging at the same time.
In addition, Ethernet needs to set ip, gateway and other related settings, which is more complicated than serial port.
The speed disadvantage of serial port is not obvious in debugging occasions. It is better to say that the speed of Ethernet is completely wasted on debugging.
As far as I know, serial port has always been the most mainstream debugging interface on embedded devices.