16550 uart

come to the urgent write to memory, when the DMA to the peripheral to write data supplied by the processor, DMA will get data directly from the DDR, moving to the peripheral, and this data is not intended to carry the data, in this case to call the cache writeback function, before the DMA data transfer to write the cache data into the DDR, to ensure the consistency of the DDR and cache data. 4:EDMA control of data handling between DDR and serial port Due to the EDMA of 64 events and peripherals

,#endifgenericapp_processevent//self-defined task handler function};Initialize the task:void Osalinittasks (void)//Add a task ID for each process to use as a lookup task{Uint8 TaskID = 0;Tasksevents = (UInt16 *) osal_mem_alloc (sizeof (uint16) * taskscnt);Osal_memset (tasksevents, 0, (sizeof (uint16) * taskscnt));Mactaskinit (taskid++); task ID number for//MAC layerNwk_init (taskid++);//Network ID AssignmentHal_init (taskid++);//Hardware ID Assignment#if defined (mt_task)Mt_taskinit (taskid++);#

(1) Dma_1: memory to periheral Read_master: Address of the array in SDRAM Write_master: UART txdtxddata address (2) uart ip Customization (3) Dma ip Customization According to the DMA ds, at least two times the read_master depth is required. Otherwise, an error will occur (1024 is prepared here, so an increase of 11: bit is generated) The number of times is the length of the

are placed in the xdata area. If you want to save data space, you must use the large mode to place the variables of the undefined memory location in the data area (it is of course best to specify the memory type for all variables). But when you use pointers, you specify the pointer to the type. In C51, a generic pointer that defines a memory type occupies 3 bytes, two pointers to the data area occupy only 1 bytes, and a pointer to the XData area occupies 2 bytes (for example, p points to data a

because the data block delivery begins to be indicated by the synchronous character, and the synchronization between the sending and receiving ends is required by the clock, the hardware is more complicated. Direction of communicationIn serial communication, the one-way transmission that can only be sent or received by the communication interface is called a single-work transmission , and the two-way transmission of data is called Duplex transmission . Half-duplex transmission between the two m

for initializing the page table. Check carefully and find that it is because DRAM is not initialized. After DRAM Initialization is added, first put the flashlight program behind DRAM initialization and you can find it. At this time, unfortunately, when I moved the flashlight program, I only copied half of the Code. Of course, I did not check the code carefully, I suspect that the MMU initialization code is 2440 can not be used for 6410 (lazy, guilty), so find the arm11jzf-s manual, a few hundre

CC2430 data sheet. Data Reception on the UART is Initiatedwhen a 1 are written to the uxcsr.re bit The UART would then search for a valid start bit on the RXDX input pin and set the uxcsr.active bit High. When a validstart bit had been detected the received byte is shifted into the receive register. The Uxcsr.rx_byte bit is set and a receive interrupt are generated when the operation have completed. The re

ZZ from:http://blog.csdn.net/ly601579033/article/details/48318239 ============================================================= The general flowchart is as follows: After power-on, the Reset,arm core starts executing the Boot ROM, with the following actions: (code is cured in ROM) 1. Initialize the built-in SRAM stack 2, initialize the NAND/EMMC (mobile phone built-in storage) 3. Import the pre-loader stored in NAND into the SRAM 4. Jump to SRAM to execute Pre-loader Perform Pre-loader operati

This feature has been raised on the Qualcomm platform and Samsung platforms, based on Android 6.0, which uses the Bluetooth feature on the phone as a Bluetooth headset. Bluetooth phone and Bluetooth music between them, the difference between the high-real-time Bluetooth phone calls, and its A2DP use of the physical path is not consistent, Bluetooth phone to take the PCM physical path, while Bluetooth music to go the UART path. Key Words hfpclient BT S

I haven't updated my blog for a long time. Don't think I'm too lazy because I started school, but my study in the New Tang Dynasty is not over. I haven't written a blog for such a long time because I encountered a tangle problem during my learning process. This problem has been nearly three weeks since January 1, September 1, that is, RS485 communication, I would like to write down my own mistakes to avoid detours when I see the article. If you want to use the 485 communication function, you wil

language) to implement the quasi-Communication Letter Number _ p and _ outp.---- Although the number of API functions in Windows is widely used, the complexity is fixed by the complexity, the programming process is divided into the initial string port, configuration string port, ultra-time control system, data transmission, and closed string port.---- Connect through VC ++---- 1. initialize the communication interface---- Before passing through the serial port of the computing machine to send a

Read the printk code We usually use printk when writing kernel code. here we can see how printk is associated with UART. I will not introduce hardware related to UART, so easy. Here we just read the printk code to see the association with the UART driver. Printk --- the function is implemented in the kernel/printk. c file. Many of the following functions are in t

. Under the shift pulse of the main device, the data is transmitted by bit, with the highest position in front and the lowest position in the back, full Duplex Communication.If you use a general IO port to simulate the SPI bus, you must have an output port (SDO), one input port (SDI), and the other port depends on the type of the implemented device, if you want to implement a Master/Slave Device, You need to input the output port. If you want to implement only the master device, you need to outp

1. SendCall Uart_init (115200,115200); Initialize the serial port, the baud rate is set to 115200. The previous one is setting the baud rate of the uart0, followed by the setting, the UART baud rateYou can then use Uart0_tx_buffer (uint8 *buf, UInt16 len) to send data from uart0, and you can use the os_printf () function to send data, but be aware that if you use serial 1Want to use os_printf () need to modifyOs_printf This interface is printed from

-wa5210g_v2_140523) when I tried to downgrade using the Web interface, an error occurred.Using the serial portI dropped the initial goal for the moment, and instead I tried to find a way to control the device and install the software I needed. My first method was to use the UART serial communication method, I soldered the UART pin to a pin, using bus Pirate (my choice) or something like that to connect him

ICore3 Demo V1.0 Program DescriptionFirst, OverviewThis kit contains 5 folders:1, "Arm" is icore3 on ARM's package, the development environment for KEIL 5.17;2, "FPGA" is icore3 on the FPGA package, the development environment for QUARTUSII 15.0 (as if the lower version can also be opened);3, "Related software" contains putty terminal software and UDP debugging software;4, "screen" for the work;5, "Drive" for the onboard USB to UART driver, this exper

, the power-on startup process is as follows: 1. RBL stage: after the system is reset, The RBL program stored in the On-Chip Rom starts to run, the RBL program judges the startup mode based on the level of the btsel [0-3] pin. [00] indicates that it is the NAND startup mode, and the RBL program reads UBL data from the external NAND flash to the internal RAM (UBL can be up to 14 K ), go to UBL Code and run it. [01] indicates that it is emifa startup mode, and RBL directly goes to emifa e

When using struct pointer variables, it is often easy to make a "low-level" error. That is, after defining a struct pointer variable, you can directly operate on the struct Member pointed to by the struct pointer variable, resulting in some inexplicable errors. WeYou must assign a valid struct variable address to the struct pointer variable to operate the struct variable normally.. For example: Struct UART { Int; Uchar B; } Ma

Tool to start downloading. PS: When you turn off the power supply, remove the power cord of the motherboard first, and then turn off the power supply. The power supply voltage should be around 3.9v, not higher than 4.1 v 5. Format: kal_prompt_trace (MOD_USB, "LCD _backlight = % d, % d", LCD _backlight, time_enum );) Download the BIND file to your mobile phone Start the instance and enter * #9646633 # In the phone to enter the working mode, select a device in the working mode, select Set

;_ 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 */Case XXX:/* do we call it "interrupt driver? */...Bre