16550 uart

Step 1: Initialize the baud rate, line control register-query line Status Register-read data-Handle error status -Send data Step 1 UART initialization procedure 1. Set u0lcr bit bit7 to 1 so that u0dlm u0dll registers can be written. 2. Set the baud rate register value to fpclk/(16 * baud) High 8-bit write u0dlm low 8-bit write u0dll 3. Set u0lcr to 0. Disable u0dlm u0dll to write the remaining u0rbr bits. 4. Set u0lcr,

First blog, the first record of the one weeks of learning content.The first of the UART learning path is the introduction of the basic concept of the UART. Follow-up will use stm32f407 serial port and PC communication. Finally, Verilog HDL is used to write the serial transmitting module and receiving module, complete the simulation and complete the communication on the Zedboard board.First clarify what is

Why does UART need FIFO? Modern CPUs run faster and faster. UART usually has a baud rate of less than 10 M. In the absence of FIFO, CPU time is consumed for each data filling to or from UART, this is a great waste. Therefore, the UART is configured with FIFO as the buffer for data sending and receiving on the hardware.

The serial communication interface is one of the most common methods for data communication between a processor and other devices. MyProgramThe library is for the msp430f14 series and msp430f16 series. I usually use the single-chip microcomputer: msp430f149 and msp430f169. Both single-chip microcomputer have two Enhanced serial communication interfaces, both of which can be synchronous or asynchronous communication. Even the 169 module usart0 can perform I2C communication. Here, we will only dis

Cortex-M3 learning and debugging of stm32f10x UART In the process of learning the stm32f10x Development Board, the first learning routine is the UART Printing program. Due to the previous experience of single-chip microcomputer, UART programming is not unfamiliar, however, in order to lay a solid foundation for programming, the routine should be analyzed and intr

UART initialization. 1. We can see through the schematic diagram that the serial port rxd and txd are connected to ok6410 gpa0 and gpa1 respectively .. So first set the input and output status of gpio: 0010 = UART rxd [0] 0010 = UART txd [0] At the same time, set the corresponding up/down resistance relationship. rGPACON = (rGPACON ~(0xff rGPAPUD = (rGPAPUD ~(

We manufacture a new accessory for ipad/iphone which should transfer commands to the IPad. We Use the UART (through a certain apple-protocol called Lingo). My shows that I can only use USB (30PIN Connector) and custom protocols.Question: Is there any-to-use UART-to-connect to the IPad accessory from APP side? If the protocol is implemented in UART, w

: Usart_gpio_init//function: UART GPIO initialization//Ingress parameters: none//Export parameters: none//Note://***************************************void usart_gpio_init ( void) {Gpio_inittypedef gpio_initstructure; Rcc_ahbperiphclockcmd (Rcc_ahbperiph_gpiob, ENABLE);//-----PB6 TX------------------PB7 RX-------------Gpio_ Initstructure.gpio_pin = gpio_pin_6| gpio_pin_7; Gpio_initstructure.gpio_mode = GPIO_MODE_AF; Gpio_initstructure

Uart-wifi Module ESP8266 Because it is only a module, not a complete development board, so you need to connect the peripheral circuit. The trial process encountered a lot of trouble, here all record. 1. Confirm Hardware Version Since the ESP8266 version has been updated, so you need to confirm the PCB version. Features: The middle four IO ports are wired to connect out. 2. Hardware connection If confirmation is the hardware version above, then its

Serial communication is often used to the function, in the STM32 UART has the DMA function, and send and receive can use DMA, the use of DMA sent basically you will not encounter any problem, because when sent will tell the DMA to send the data length, DMA according to send the length of the direct send is OK, However, the use of DMA receive time is different, because sometimes the data receive is not every time is fixed length, but DMA only receive d

Transferred from: http://blog.csdn.net/zeroboundary/article/details/8966586In RS232 the CTS and RTS have a clear meaning, but since Hayes (HAYES) introduced smart Cat (SmartModem) is a bit confusing, but now this meaning for the mainstream, the main chip manufacturers of the UART controller flow control basic use HAYES Modem flow control interpretation.In RS232, the RTS and CTS are used to switch direction in half-duplex mode, this paper does not expl

Code base (only two files were added on the base of HACKRF original code base, one file was changed):Https://github.com/JiaoXianjun/hackrf-UART-1602LCDThe goal is primarily to help people who want to change the debug HACKRF firmware. Because there is no debugging means to change the firmware basic two eyes a dark, groping in the darkness is difficult. The previous days to collect the aircraft firmware has been in the dark good grasp debugging means, s

Misleading of UART instance demo in lpcxpresso Misleading of UART instance demo in lpcxpressoImport the UART project in example project. In the UART. c file, initialize the serial port processing function to assign the initial value of uartcount to 0.In the main function, after initialization, The uartcount value is u

connection method:Figure 2 UART Flow Control. Specifically, when the receiver (uart2) deems it acceptable to accept UART data, the RTS is set to a valid bit. The CTS pin of the sender (uart1) receives this signal before sending the data. Generally, when the UART data receiving cache is larger than two bytes free, you can set RTS to receive data effectively. Of c

Objective: to control UART serial port transmitting and receiving data in user space by reading and writing UART device files.Setting the UART baud rate, parity enable, and so on in user space is done through the Termios structure and the Termios library function , which requires the termios.h header file to be included in the application.I. Definition of Termios

Recently too busy, there is no time to write about the ucos-ii transplant, first of all the work is easy to make a mistake in the knowledge points recorded, about the CTS and RTS. In RS232 the CTS and RTS have a clear meaning, but since Hayes (HAYES) introduced smart Cat (SmartModem) is a bit confusing, but now this meaning for the mainstream, the main chip manufacturers of the UART controller flow control basic use HAYES Modem flow control interpreta

One, Usart data transmission1, Usart Introduction1) in cc2530, there are two serial ports,UART0 corresponding external device IO pin relationship is: p0_2------RX, p0_3------TXUART1 corresponding external device IO pin relationship is: p0_5------RX, p0_4------TX2) modeUART mode and SPI mode2. UART Configuration1) clkconcmd=~0x40; Select the system clock source for external 32MHzcrystaloscillator.2) while (clkconsta0x40); Wait for crystal stability3) c

, but now this meaning for the mainstream, the main chip manufacturers of the UART controller flow control basic use HAYES Modem flow control interpretation.In RS232, the RTS and CTS are used to switch direction in half-duplex mode, this paper does not explain;If the UART only RX, TX two signal, to flow control can only be soft-flow control, if there is rx,tx,cts,rts four signal, it is mostly support the ha

==== This article is the original site. You are welcome to reprint it! Reprinted please indicate the source: http://blog.csdn.net/yyplc==== This article is original in itspy. If you copy or repost it, please indicate the original source at http://blog.csdn.net/yyplc/article/details/7196290. thank you! Software (linux-2.6.30.4 ): The serial port driver of Linux is the same as that of general character devices. It adopts a hierarchical architecture and is regarded as a serial system. (1) underlyin

1. System OverviewThis design uses NIOS2 32-bit processor, through the SPI interface to the SD/TF card in the JPEG image data read into memory, SD/TF card file system for the FAT32,NIOS2 software implementation of the JPEG image through the UART serial port sent to the host computer display, the system diagram is as follows:650) this.width=650; "src=" Https://s3.51cto.com/wyfs02/M00/8F/A9/wKiom1jnqIqQ3_fnAAAVKUViYLs255.png "title=" Uart_ Arch.png "alt