16550 uart

Original: http://blog.csdn.net/xukai871105/article/details/12684617 Raspberry Pi from abroad, foreign embedded open source field has a good sharing spirit, Raspberry Pi Various integrated libraries are also emerging, the following recommended several. "Python GPIO" (the more precise name of the library should be Raspberry-gpio-python)Simple Introduction: Recommended and easy to get started in the Raspberry Pi official profile. Python gpio is a small Python library that can help users complete ra

module should typically include the following functions:(1) Interrupt Service program ISR(2) initialization of hardware　　A, modify the register, set the hardware parameters (such as the UART should set its baud rate, Ad/da device should set its sampling rate, etc.); b , /* set interrupt vector table */ M_myptr = Make_far_pointer (0l);/* return void far void FAR * * * M_myptr + = Itype_uart;/* Itype_uart:

Analysis of---Based on ti cc254x osalWhen the tool chain configuration is complete, sourceinsight to you to show a source project, without the help of Baidu and development documents, in one or two hours to understand the source of the composition of the framework and interface, for rapid development?" how to quickly understand a new embedded operating system " We have analyzed how to quickly understand Osal task scheduling and inter-mission communication (in fact, Osal just resembles a multitas

: #include Arch/arm/plat-samsung/include/plat/uncompress.hThere are PUTC implementations in Arch/arm/plat-samsung/include/plat/uncompress.h:Static voidPUTC (intch) { if(Uart_rd (S3c2410_ufcon) S3c2410_ufcon_fifomode) { intLevel ; while(1) { level=uart_rd (S3c2410_ufstat); level=Fifo_mask; if(Level Fifo_max) Break; } } Else { /*Not using FIFOs*/ while((Uart_rd (s3c2410_utrstat) s3c2410_utrstat_txe)! =S3c2410_utrstat_txe) bar

interrupt arrives, the ISR reads the received bytes (②) from the receiving buffer sbuf of the UART, puts it into the receive buffer (③), and then wakes the read operation (④, ①) of the user's task side by receiving the semaphore. Throughout the process, you can query the value of the variable for the current number of bytes in the record buffer, which indicates whether the receive buffer is full. The UART

-215 Receiver Card Ports214 Write:latch data, Read:data215 READ:MSB of address, next read:lsb of address21F Reserved220-26f Reserved for I/O Channel270-27f third parallel port (see parallel port):278 Data port279 Status Port27A Control Port280-2AF Reserved for I/O Channel2A2-2A3 Msm58321rs Clock2B0-2DF Alternate EGA, or 3270 PC video (XT, at)2E0 Alternate EGA/VGAE1 GPIB Adapter (at)2E2-2E3 Data Acquisition Adapter (at)2e8-2ef COM4 non PS2 UART (Reserv

Use STM32CUBEMX to generate initialization code.Problem:The HAL_UART_TRANSMIT_DMA function can only be called once, and the second time returns the state Hal_uart_state_busy 0x02.Reason:STM32L1XX_HAL_UART.C begins with a description(##) DMA Configuration If you need to use DMA process (HAL_UART_TRANSMIT_DMA ()and HAL_UART_RECEIVE_DMA () APIs):(+++) Declare a DMA handle structure for the TX/RX channel.(+++) Enable the DMAx interface clock.(+++) Configure the declared DMA handle structure with the

interrupt, you can compile a program with a more complex structure. Such a program can do one thing and monitor one thing. Once something is monitored, interrupt what is being done, process monitoring, of course, you can also monitor multiple things, the image analogy, the interruption function enables the single-chip microcomputer to have a bowl, look at the pot function. The above three steps are equivalent to killing the dragon and giving up the eight-handed martial arts. You can barely prot

. Related functions include: (1) set the interrupt vector table /* Dos. h */Void _ Cdecl setvect (int interruptno, void interrupt (* isr )()); For example, if the interrupt Number of com3 is 4, the address of the corresponding interrupt vector table is 0x0c, and the function of the interrupt program corresponding to 0x0c is set: Setvect (0x0C, PORT1INT ); The interrupt service program port1int is: Void interrupt PORT1INT (){Int c;Do{C = inportb (port1 + 5 )

responsible for system startup, initialization, interruption, and externalBus functions. FEC provides 10/100 M Ethernet Control, which provides independent FIFO and burst DMA, so it can provide 10/100 M Ethernet without affecting CPM PerformanceConnection. Four SCC channels can be independently configured as HDLC mode, asynchronous HDLC mode, and 10 M Ethernet mode. Two SMC channels can be configured as UART mode and transparent transmission mode. I

tagintqueue * next;} Intqueue;Intqueue lpintqueuehead;_ Interrupt isrexample (){Int inttype;Inttype = getsystemtype ();Queueaddtail (lpintqueuehead, inttype);/* Add a new interrupt to the end of the queue */} Judge whether there is any interruption in the main program loop: While (1){If (! Isintqueueempty ()){Inttype = getfirstint ();Switch (inttype)/* Is it like the message parsing function of Win32 program? */{/* Yes. Our interrupt type resolution is similar to message-driven *

September 2011 Time to make notes, then read interrupt subsystem code after doing a PPT, kernel version do not remember, hardware platform is Samsung's s5pv210.This part is mainly for the assembly and hard IRQ parts, the processing of SOFTIRQ after hard IRQ processing, and the processing of the lower half (tasklet/workqueue) are not involved.Agenda? Interrupts in ARM? Important structs? External Interrupt resources in s5pv210? Code flow? Kernel API? Interrupts in ARMThere are only two interrupt

The recent use of node's serial library found very slow, I wrote a driver in C + + using node to call it and test pass, the speed is also very fast, the original version recorded:Test.jsvar test = require ('./build/release/test '); test. Arduinodevice (function(data) { console.log (data);});Gyp configuration:{ "targets":[ { "target_name": "Test", "sources": ["test.cc"] } ]}test.cc#include #include#include#include//used for UART#incl

Already ported code download: http://download.csdn.net/detail/lxj_com2006/3793887 Welcome Exchange: qq:67016879 email:lxj_com@163.com Directory 1 Overview: ... 1 2 source file list: ... 2 3 Structure diagram: ... 3 4 circuit schematic diagram reference: ... 4 4.1 Choice of communication interface: ... 5 5 Demo program Detailed: ... 5 5.1 Header file: ... 5 5.2 Buffer Buffer: ... 6 5.3 Debugging Information: ... 6 5.4 SPI communication mode: ... 6 5.4.1 SPI MCU io foot configuration: ... 7 5.5

You can go to the Web address online to browse the corresponding datasheet: Http://infocentre.arm.com/help/index.jsp?topic=/com.arm.doc.set.primecell/index.html You can also go to the URL in which to download the corresponding PDF version of the datasheet: --------------------------------------------------------------------------------------------------------------- -----AMBA Controllers and peripherals ARM Document set for ARM AMBA peripherals, intellectual property (IP) macro units for on-chip

ZigBee Tour (v): Several important CC2430 basic experiments--serial communication first, the connecting link In the wireless sensor network, the CC2430 needs to send the collected data to the host computer (ie pc), while the host computer needs to transmit the control information to the CC2430. All this is inseparable from the transmission of information between the two. In this section, we will learn how to realize the serial communication between PC and CC2430. CC2430 includes 2 serial commu

click Next, 　　 Select Hello World as the project template and Finish. In this case, the project folder just created appears in the project browser on the left. Find helloworld. c In the drop-down menu src, and double-click it to edit it. 　　 Edit the code, click Save, and compile 　　 Check the compilation report on the console. If no error occurs, the compilation is successful. Next, you can connect to the Zedboard for board-level debugging. 4. board-level debugging 　　After the application is co

First, install the serial port tool setserial.Command: sudo apt-GetInstall setserial, Using setserialTool to view the serial port information, $Sudo setserial/dev/ttys0-/Dev/ttys0,Line 0, UART: Unknown, Port: 0x03f8, IRQ: 4Baud_base:115200, close_delay: 50, divisor: 0Closing_wait:3000Flags:Spd_normal skip_test$Sudo setserial/dev/ttys3-/Dev/ttys3,Line 3, UART: 16550

connection. This process is called the function of redirecting the C language library, as shown in figure 6.For example, a user has an I/O device (such as UART ). The original library function fputc () Outputs characters to the debugger control window, but the user changes the output device to the UART port, so that all () the printf () Series Function outputs of the function are redirected to the

? File descriptor: for example, when a text file is opened, a descriptor is generated. When a UART is opened, a descriptor is generated. When a Socket socket is opened, it is also a descriptor... these descriptors are these elements .. it is about 1024. Check whether it is true. So what are these elements, or what are the operational features of these file descriptors? Well, Linux only seems to have three rwx or 421. in this case, the features of thes