For example, transmission uses 256 Order symbols, Every time 8bit Represents a symbol, The data transfer rate is 120 character / second, Then the baud rate is 120 baud, The bit rate is 120*8=960bit/s. The amount of information a symbol represents （ Number of bits ） It depends on the order of the sign. Represents the number of symbols transmitted per second （symbol）. Uart The transmission data is shown in the figure 2-1 Shown ：īaud rate is a measure of data transfer rate. Free bit ： In logic “1” state, Indicates that there is no data transmission on the current line.
The more bits apply to stop bits, The greater the tolerance of different clock synchronization, But the data transfer rate is also slower. So the stop bit is not just the end of the transmission, And provide the opportunity for the computer to correct the clock synchronization. īecause the data is timed on the transmission line, And every device has its own clock, It's likely that there is a small out of sync between the two devices in the communication. It can be 1 position 、1.5 position 、2 Bit high level. Stop bit ： It's the end of a character data. Parity bit ： After adding this bit to the data bit, bring “1” The number of digits should be even ( Even check ) Or odd ( Odd check ), To verify the correctness of data transmission Start at the lowest level, Positioning by clock. The number of data bits can be 5、6、7、8 etc. Start bit ： Let's start with a logic ”0” The signal of, Indicates the beginning of the transmission character. The significance of each of you is as follows ：
#Uart drivers for ubuntu serial#
UART As a kind of asynchronous serial communication protocol, The working principle is to transmit each character of data one by one.
#Uart drivers for ubuntu Pc#
In embedded devices ,UART Used for communication between host and auxiliary equipment, Such as car sound and external connection AP Communication between, And PC Computer communication includes communication with monitor debugger and other devices, Such as EEPOM signal communication.
#Uart drivers for ubuntu full#
The bus communicates in both directions, Can achieve full duplex transmission and reception. UART It's a universal serial data bus, For asynchronous communication. As a chip that converts a parallel input signal into a serial output signal ,UART It is usually integrated into the connection of other communication interfaces. It converts the data to be transmitted between serial communication and parallel communication. Universal asynchronous transmitter receiver transmitter （Universal Asynchronous Receiver/Transmitter), Often referred to as UART, It's an asynchronous transceiver, It's part of the computer hardware. ： A bite of Linux One 、 Module hardware learning 1.1. More embedded Linux original, Please pay attention to the official account.
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