CN108062274A - A kind of adjustment method for starting code for embedded system compilation - Google Patents
A kind of adjustment method for starting code for embedded system compilation Download PDFInfo
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- CN108062274A CN108062274A CN201610983786.2A CN201610983786A CN108062274A CN 108062274 A CN108062274 A CN 108062274A CN 201610983786 A CN201610983786 A CN 201610983786A CN 108062274 A CN108062274 A CN 108062274A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/36—Preventing errors by testing or debugging software
- G06F11/3664—Environments for testing or debugging software
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/36—Preventing errors by testing or debugging software
- G06F11/362—Software debugging
- G06F11/3624—Software debugging by performing operations on the source code, e.g. via a compiler
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/36—Preventing errors by testing or debugging software
- G06F11/362—Software debugging
- G06F11/3648—Software debugging using additional hardware
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- General Physics & Mathematics (AREA)
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Abstract
The present invention proposes a kind of adjustment method for starting code for embedded system compilation, including：In the external LED light of the hardware circuit of embedded system and the lead of low and high level can be inputted；Control program is inserted into the corresponding position of code to be debugged, the control program is according to the breakpoint number of input, with the light on and off of binary-coded form control LED light, the control program read (CP read) takes the input state of the lead of input low and high level, input high level then jump out the control program and continue to run with by program, input low level is then rested in control program, until input state then jumps out Xun Huan for input high level；After insertion control program, input breakpoint number is treated debugging code and is debugged；The implementation status of breakpoint is obtained by the light on and off situation of LED light, and passes through lead input low level and code to be debugged is controlled to stop at breakpoint, input high level controls code to be debugged to be continued to run at breakpoint.The present invention solves the problems, such as that the assembly code debugging of embedded system startup stage is difficult.
Description
Technical field
The present invention relates to field of computer technology, and in particular to a kind of debugging for starting code for embedded system compilation
Method.
Background technology
Kernel is unziped to one by the start-up course of embedded Linux operating system, the gunzip in kernel mirror image
After on specific address, the inlet for just jumping to kernel is performed.What kernel performed is most initially that a paragraph assembly code carries out
The initial work of chip-scale, the performing environment of the assembly code are divided into two parts, and first half is that CPU does not open page table also
Mapping, latter half are that CPU opens page table mapping.
When changing and debugging the assembler before opening page table, when the execution for needing tracking assembler and register
Situation is needed under normal conditions using JTAG emulators, but some equipment do not have jtag interface or have jtag interface still
There is no JTAG emulators, result in the trace debug that can not complete this partial code.Simultaneously because CPU, which is in initialization, starts rank
Section, most of peripheral hardware can not use, can not be by type information come trace routine progress.
The content of the invention
The present invention provide it is a kind of for embedded system compilation start code adjustment method, this method use LED light with
The method that binary-coded form is shown starts to debug the compilation before tracking embedded system opens page table mapping
Code.
Concrete scheme is as follows：
A kind of adjustment method for starting code for embedded system compilation, including：
In the external LED light of the hardware circuit of embedded system and the lead of low and high level can be inputted；
Control program is inserted into the corresponding position of code to be debugged, which is compiled according to the breakpoint number of input with binary system
The light on and off of the form control LED light of code, the control program read (CP read) take the input state of the lead of input low and high level, input high level
Then program is jumped out the control program and is continued to run with, and input low level is then rested in control program, until input state is defeated
Enter high level and then jump out Xun Huan；
After insertion control program, input breakpoint number is treated debugging code and is debugged；
The implementation status of breakpoint is obtained by the light on and off situation of LED light, and passes through lead input low level and controls code to be debugged
Stop at breakpoint, input high level controls code to be debugged to be continued to run at breakpoint.
Wherein, the quantity of the external LED light is determined according to the quantity of breakpoint.
Advantageous effect of the present invention：The present invention is by external LED light and using the display methods of binary coded form, embedding
Enter and added in formula Linux system compilation startup program to the control method of the LED light, can very easily play set breakpoint and
The effect of Break point operation, the assembly code for solving the embedded systems startup stage such as linux well debug difficult ask
Topic.
Description of the drawings
Fig. 1 is flow chart of the one embodiment of the invention to the control method of LED light.
Specific embodiment
To further illustrate each embodiment, the present invention is provided with attached drawing.These attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be coordinated to explain the operation principles of embodiment.Cooperation ginseng
These contents are examined, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention.Now tie
Closing the drawings and specific embodiments, the present invention is further described.
A kind of adjustment method for starting code for embedded system compilation of the present invention, including：
In the external LED light of the hardware circuit of embedded system and the lead of low and high level can be inputted；
Control program is inserted into the corresponding position of code to be debugged, which is compiled according to the breakpoint number of input with binary system
The light on and off of the form control LED light of code, the control program read (CP read) take the input state of the lead of input low and high level, input high level
Then program is jumped out the control program and is continued to run with, and input low level is then rested in control program, until input state is defeated
Enter high level and then jump out Xun Huan；
After insertion control program, input breakpoint number is treated debugging code and is debugged；
The implementation status of breakpoint is obtained by the light on and off situation of LED light, and passes through lead input low level and controls code to be debugged
Stop at breakpoint, input high level controls code to be debugged to be continued to run at breakpoint.
In the present embodiment, the quantity of external LED light is determined according to the quantity of breakpoint.
In one embodiment, first in external 2 LED light of hardware circuit pin（LED_1,LED_2；The number of LED light
It is determined according to required breakpoint number, here by taking 2 LED as an example）The lead that can input low and high level with one
（Line_onoff）.
When debugging the assembly code before opening page table, the control program implemented function such as is inserted into corresponding position：Root
According to the number (breakpoint number) of input, by the light on and off of binary-coded form control LED；The state of line_onoff is read, it is high
Level then jump out this control program and continue to run forward by program, and low level is then rested in the control instruction, until line_
Onoff then jumps out for height.Control flow chart is as shown in Figure 1.In the present embodiment, 2 LED can make a call to 3 breakpoints, 3 breakpoints
The light on and off of LED light are as follows：
Breakpoint 1（01）：LED_1 goes out, and LED_2 is bright；
Breakpoint 2（10）：LED_1 is bright, and LED_2 goes out；
Breakpoint 3（11）：LED_1 is bright, and LED_2 is bright.
By setting breakpoint number, and according to the combination light on and off situation of LED, it can be easily tracked what code to be debugged performed
Sequentially.Simultaneously line_onoff is made to connect low and high level and can go to control routine at breakpoint whether to continue to execute, it is defeated in lead
Enter low level control code to be debugged at breakpoint to stop, input high level controls code to be debugged to continue to run at breakpoint.
In other one embodiment, it can achieve the effect that make a call to 7 breakpoints by external 3 LED etc., it is other real
Existing step is same as the previously described embodiments.
The present invention is converged by external LED light and using the display methods of binary coded form in Embedded Linux System
It compiles in startup program and calls the LED light control method, can very easily play the role of setting breakpoint and Break point operation,
Solve the problems, such as that the assembly code debugging of the embedded systems startup stage such as linux is difficult well.
Although specifically showing and describing the present invention with reference to preferred embodiment, those skilled in the art should be bright
In vain, do not departing from the spirit and scope of the present invention that the appended claims are limited, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (2)
1. a kind of adjustment method for starting code for embedded system compilation, which is characterized in that including：
In the external LED light of the hardware circuit of embedded system and the lead of low and high level can be inputted；
Control program is inserted into the corresponding position of code to be debugged, which is compiled according to the breakpoint number of input with binary system
The light on and off of the form control LED light of code, the control program read (CP read) take the input state of the lead of input low and high level, input high level
Then program is jumped out the control program and is continued to run with, and input low level is then rested in control program, until input state is defeated
Enter high level and then jump out Xun Huan；
After insertion control program, input breakpoint number is treated debugging code and is debugged；
The implementation status of breakpoint is obtained by the light on and off situation of LED light, and passes through lead input low level and controls code to be debugged
Stop at breakpoint, input high level controls code to be debugged to be continued to run at breakpoint.
2. the adjustment method according to claim 1 for starting code for embedded system compilation, which is characterized in that described
The quantity of external LED light is determined according to the quantity of breakpoint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610983786.2A CN108062274A (en) | 2016-11-09 | 2016-11-09 | A kind of adjustment method for starting code for embedded system compilation |
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| CN201610983786.2A CN108062274A (en) | 2016-11-09 | 2016-11-09 | A kind of adjustment method for starting code for embedded system compilation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112000375A (en) * | 2020-07-13 | 2020-11-27 | 深圳市智微智能软件开发有限公司 | Starting stage judgment method, device, equipment and storage medium of android system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112000375A (en) * | 2020-07-13 | 2020-11-27 | 深圳市智微智能软件开发有限公司 | Starting stage judgment method, device, equipment and storage medium of android system |
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