(1) Conversion between data type and byte array
The data transmitted directly in the string is a byte array bytearray, which is an array of type uint8.
The data of a float type can be represented by 4 bytes, the data of type Double is 8 bytes, and so on, each type of data has a corresponding byte array representation.
What we want to achieve is to convert the float type data to the corresponding uint8 array
This is a creation in
Article, where the information may have evolved or changed.
Similar to this CA, if the instance is converted to json.list it becomes a string.
[CPP]View Plaincopyprint?
typeca struct {
list[] uint8
}
Funcmain () {
ca:=ca{[]uint8{1,2,3,4,5,6,7,8,9,0}}
r,_:=json. Marshal (CA)
fmt. Println (String (r)) //{"List": "aqidbaugb
This is a created
article in which the information may have evolved or changed.
Similar to this CA, if the instance is converted to json.list it becomes a string.
Type CA struct {List []uint8}func Main () {CA: = Ca{[]uint8{1,2,3,4,5,6,7,8,9,0}}r, _: = json. Marshal (CA) fmt. Println (String (r))//{"List": "aqidbaugbwgjaa=="}}
And what we want is a normal JSON. Only int8 byte
Pecific Integral type Limits
specifier
Common equivalent
Signing
Bits
Bytes
Minimum Value
Maximum Value
int8_t
Signed Char
Signed
8
1
−128
127
uint8_t
unsigned char
default segment assumption. the default segment is used unless the segment override prefix is used to change the segment of the current addressing instruction.
Entry format
Typedef struct
{
Uint16 limit_0_15;
Uint16 base_0_15;
Uint8 base_16_23;
Uint8 accessed: 1;
Uint8 readable: 1;
Uint8 conforming: 1;
First, analyze the hard disk 0 head 0 cylinder 1 sector, that is, MBR (Main Boot Record). It starts from 0x1be, and 16 bytes is a data structure called partition information, for the specific format, see the following instance program. Generally, there are no more than 4 instances.
The first and last CHS parameters of each partition can be obtained in this data structure to facilitate reading of each partition.
The data volume is small, and the instance program requires ccdos Chinese support. Th
Http://blog.163.com/qiang625@126/blog/static/170040164201211431959819/
I. Information management API
Osal_msg_allocate () function prototype: a task allocates an information buffer. When a task call or function is called, the space is filled with information or the function osal_msg_send () is called () sends the buffer space information to other tasks. If the buffer space cannot be allocated, msg_ptr = NULL is set;
Uint8 * osal_msg_allocate (uint1
struct plc_state
{
Uint8 cur_state;
Uint8 next_state;
Uint8 (*action) (uint8 init, void *args);//How does this structure work?
};
void plc_machine_opt (void *args)
{
struct Plc_state *pstate = plc_state.pstate;//The key is to see who changed the Plc_state.pstate, found who changed it, is the upstream data to get t
Last time I tested the class and struct respectively: struct. Now we will further analyze and interpret the MSIL (Microsoft intermediate language) code generated by the compiler.
I. Preparations
Find "IL disassembly program" (start \ Program \ Microsoft Visual Studio 2010 \ Microsoft Windows SDK Tools \)--
Run the "IL disassembly program" and open the compiled exe. Expand the node and double-click the leaf node to view the MSIL code --
Ii. Result Analysis
Then we will copy and extract the line
"indicate", which is answered, is more suitable for reliable communication mode.3, indicate switch how to open, close?That is, 0x0002 writes to the CCC bit with the attribute value of "indicate", then the instruction is opened; if 0x0000 is written, the instruction is closed.Note: If you write 0x0001 to the CCC bit of the attribute value "indicate", it is useless.V. Purpose of the experimentBy pressing the "center" key of the five keys to send the indicate data to Btool, the "indicate" and "rep
))
// Define some color values# Define red 0x001f# Define blue 0xf800# Define green 0x07e0# Define black 0x0000============================================Some examples in LCD _driver.c:In this driver file, you need to define several functions: Draw a point, take a point, draw a horizontal line, draw a vertical line, draw any two-point line four functions, and must be consistent with the function declaration in gui_basic.h. In my porting, I used macros to contact these functions in LCD _driver.
Today, I try to save the array to flash, read it again, and modify it on the original 5110 project. Can you tell where I changed it?
Uint8 chinese_font [] [25] progmem ={/* -- Text: Wu --*//* -- 9 9; the dot matrix corresponding to this font is: width x Height = 12x12 --*//* -- The height is not a multiple of 8, and is adjusted to: width x Height = 12x16 --*/{0 x, 0 x, 0x48, 0xde, 0xfe, 0xf4, 0xfe, 0 x, 0x24, 0 x, 0 x, 0 x, 0 X,0x01,0x03,0x03,0x02,0
it is not the same, add the record to the linked list. After reading all the records in the source file, write the records in the linked list to the target file.The general process 1 of the program is shown in.Figure 1 General Procedure
Expires + expires + PGJyIC8 + expires + PGJyIC8 + expires + 1tC2wcihtb21xMO/expires/Co7o8L3A + DQo8cHJlIGNsYXNzPQ = "brush: java;">
typedef struct T_FileInfoStruct{ UINT8 szContentLine[256]; struct T_FileInfoSt
UE4 provides a lot of pre-defined debugging drawing functions, it is more convenient when doing debugging. You can draw points, lines, circles, balls, arrows, vertebrae, capsules, even splines, strings, meshes, and so on in the scene, all of which are basically there. The comparison is like, you can control the thickness of the line, debugging time is more intuitive.To use these functions, you only need to include the DrawDebugHelpers.h header file. Here are a few of the main drawing functions:
Unreal engine 4 C ++ is used to draw functions for debugging.
UE4 provides many predefined debugging and rendering functions, which are convenient during debugging. You can draw points, lines, circles, balls, arrows, cubes, capsules, and even splines, strings, and grids in a scenario. What's better is that you can control the line thickness, Which is intuitive during debugging.
To use these functions, you only need to include the DrawDebugHelpers. h header file. The following describes several m
For research and development and testing BLE , often see the same name of the device, is extremely inconvenient, a large pile of equipment at the same time the Power will let colleagues do not know which device is what they really want to operate the target. Again millet bracelet, home has three millet bracelet, open the device search is all "MI", do not know which one to connect, so in the beginning of the use of the user to call the ring a few times, of course, this experience is also good. Bu
# Include # Include # Include /*************************************** ****************************************FUNC: Delete the standard file path. EG/example/New file. txtDate: 2014-7-27Note: When filesize is set to 0, the file length is not determined.**************************************** ***************************************/Uint8 tqfs_filedelete (uint8 * path){Ts_s_open_file open_file;Stringcoppy (
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