CN105224431A - The adjustment method of the multiplexing SD interface of a kind of embedded chip - Google Patents
The adjustment method of the multiplexing SD interface of a kind of embedded chip Download PDFInfo
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- CN105224431A CN105224431A CN201510565741.9A CN201510565741A CN105224431A CN 105224431 A CN105224431 A CN 105224431A CN 201510565741 A CN201510565741 A CN 201510565741A CN 105224431 A CN105224431 A CN 105224431A
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Abstract
The invention provides the adjustment method of the multiplexing SD interface of a kind of embedded chip, inner 6 IO using the clock cable of SD card interface, order wire and four data lines as three kinds of debugging interfaces are multiplexing for embedded chip; There is a wireless module comprising microprocessor embedded chip inside; When SD card inserts, SD drives and 6 IO is all switched to SD card function pin, when CPU needs debugging extremely, then need to extract SD card, connect debugging interface, then connect the wireless module of the embedded chip inside of this CPU exception with an other mobile device, send special debug command by wireless connections to described wireless module at this other mobile device end after having connected, described 6 IO are all switched to three kinds of debugging interfaces; When SD card is extracted, SD drives the IO function 6 IO all being switched to three kinds of debugging interfaces; The present invention had both saved plate level resource, can effectively debug again.
Description
Technical field
The present invention relates to the debugging wireless switching method of the multiplexing SD interface of a kind of embedded chip.
Background technology
Existing embedded device debugging relies on serial ports and some conventional hardware toolses, such as JTAG (JointTestActionGroup, joint test behavior tissue) or other TRACE (trace debug device) instrument.First this needs embedded chip to these interfaces reserved IO specially on pin, the difficulty of increase chip package.Secondly if machine product needs these debugging interfaces, will make fabric swatch increase load, and structural member is put and the thickness requirement of finished product higher, therefore complete machine is not generally reserved.But run in bursting problem needs to debug on a lot of production line, often because the fabric swatch of complete machine these interfaces reserved, cause can not adding temporarily, and cannot debug.Consider so the present invention is based on this, design a kind of adjustment method and system of multiplexing SD interface, solve these problems.
Summary of the invention
The technical problem to be solved in the present invention, is the adjustment method providing the multiplexing SD interface of a kind of embedded chip, effectively saves plate level resource, can effectively debug again.
The present invention is achieved in that the adjustment method of the multiplexing SD interface of a kind of embedded chip, and the SD card interface of embedded chip is provided with clock cable, order wire, four data lines and a card and detects pin signal wire; Inner 6 IO using described clock cable, order wire and four data lines as three kinds of debugging interfaces are multiplexing for embedded chip; And there is a wireless module embedded chip inside, wireless module comprises a microprocessor to run radio protocol stack and some radio-frequency devices;
(1), in SD card insertion situation, SD drives and reads card that SD controller recognizes to detect pin be low, judges the insertion of SD card, described 6 IO are all switched to SD card function pin; Afterwards when CPU needs debugging extremely, then need to extract SD card, connect debugging interface, then the wireless module of the embedded chip inside of this CPU exception is connected with an other mobile device, after having connected this other mobile device end by wireless module from wireless connections to the embedded chip inside of this CPU exception send debug command, after the wireless module of the embedded chip inside of this CPU exception receives these debug commands, described 6 IO are all switched to three kinds of debugging interfaces and uses;
(2), under situation extracted by SD card, SD drives and reads card that SD controller recognizes detection pin for high, judges that SD card is extracted, described 6 IO is all switched to the IO function of three kinds of debugging interfaces; Afterwards when CPU is abnormal, because 6 IO all switch to three kinds of debugging interface functions, just can directly debug.
Further, in described (1), after SD card inserts draw-in groove, the detection pin of SD draw-in groove can produce the potential change of a negative edge, now SD controller can by this plug-in card event notice to CPU, and run SD card driver by CPU and complete initialization to SD card, initialization procedure includes the function corresponding IO in I/O cell being switched to SD card, make the clock of SD controller, order and data can stick into Serial Communication by these 6 IO and SD.
Further, in described (2), after draw-in groove extracted by SD card, the detection pin of SD draw-in groove can produce the potential change of a rising edge, and now this can be pulled out card event notice to CPU by SD controller, runs SD card driver complete anti-initialization to SD card by CPU, anti-initialization procedure includes and is divided into groups between two by the corresponding IO in I/O cell, switch to three kinds of debugging interface functions, then draw these interfaces from SD draw-in groove fly line, just can debug from outside.
Tool of the present invention has the following advantages: the present invention is by the debugging wireless switching method of a kind of multiplexing SD interface of design, realize the debugging of embedded device, on pin, give interface reserved IO specially without the need to embedded chip, effectively save plate level resource, can effectively debug again.
Accompanying drawing explanation
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the structured flowchart of the conventional card inserting-in mode of the inventive method.
Fig. 2 is the structured flowchart of the inventive method plug SD mode card.
Fig. 3 is the handoff procedure schematic diagram under the inventive method CPU exception.
Embodiment
As shown in Figure 1 to Figure 3, embedded chip of the present invention multiplexing SD interface debugging wireless switching method, the SD card interface of embedded chip is provided with clock cable, order wire, four data lines and a card and detects pin signal wire; Inner 6 IO using described clock cable, order wire and four data lines as three kinds of debugging interfaces are multiplexing for embedded chip, the clock IO in these 6 IO and figure, order IO, data line IO
0~ IO
3; And there is a wireless module embedded chip inside, for the network connecting function that this embedded device is daily, wireless module comprises a microprocessor (MCU) and runs radio protocol stack and some radio-frequency devices;
(1), in SD card insertion situation, SD drives and reads card that SD controller recognizes to detect pin be low, judges the insertion of SD card, described 6 IO are all switched to SD card function pin, afterwards when CPU needs debugging extremely, then need to extract SD card, connect debugging interface, now cause SD to drive because CPU is abnormal and cannot run (driving code to be that CPU performs), although now SD card has been extracted, but 6 IO cannot be switched to debugging interface function, therefore, the present invention is the wireless module connecting the embedded chip inside of this CPU exception with an other mobile device, this connection can be that bluetooth connects, or the P2P of wifi connects, but the invention is not restricted to these two kinds, post debugging personnel are connected at this other mobile device end by the wireless module transmission debug command of wireless connections to the embedded chip inside of this CPU exception, this debug command can be the self-defining debug command of producer, after the wireless module of the embedded chip inside of this CPU exception receives these debug commands, described 6 IO are all switched to three kinds of debugging interfaces use,
After SD card inserts draw-in groove, the detection pin of SD draw-in groove can produce the potential change of a negative edge, now SD controller can by this plug-in card event notice to CPU, run SD card driver by CPU and complete initialization to SD card, initialization procedure includes the function corresponding IO in I/O cell being switched to SD card, make the clock of SD controller, order and data can stick into Serial Communication by these 6 IO and SD.
(2), under situation extracted by SD card, SD drives and reads card that SD controller recognizes detection pin for high, judges that SD card is extracted, described 6 IO is all switched to the IO function of three kinds of debugging interfaces; Afterwards when CPU is abnormal, because 6 IO all switch to three kinds of debugging interface functions, just can directly debug.
After draw-in groove extracted by SD card, the detection pin of SD draw-in groove can produce the potential change of a rising edge, now this can be pulled out card event notice to CPU by SD controller, run SD card driver by CPU and complete anti-initialization to SD card, anti-initialization procedure includes and is divided into groups between two by the corresponding IO in I/O cell, switch to three kinds of debugging interface functions, then draw these interfaces from SD draw-in groove fly line, just can debug from outside.
That is, when CPU is abnormal, as shown in Figure 3:
(1) if now SD card is not in draw-in groove, according to design before this, corresponding IO has been switched to three kinds of debugging interface functions, can directly debug.
(2) if now SD card is still inner at draw-in groove, although the interruption of a rising edge can be triggered after extracting SD card, SD controller still can notify CPU, but CPU is abnormal, cannot responds and call SD card driver and complete debugging interface function is switched to the unloading of SD card and IO.
The present invention is a wireless module (an inner integrated microprocessor is for running protocol stack and communication interaction) in embedded chip inner band, its purposes at ordinary times provides radio communication function (such as wifi, bluetooth etc.) to embedded device. when chip CPU is abnormal, commissioning staff utilizes the wireless module of an other mobile device, is connected with the wireless module of the embedded chip inside of CPU exception.After having connected, commissioning staff utilizes the wireless module of mobile device, wireless module to the embedded chip inside of this CPU exception sends special debug command, after the wireless module of the embedded chip inside of this CPU exception receives this debug command, its microprocessor performs the operation corresponding for SD card interface IO being switched to three kinds of debugging interfaces.
In addition, in Fig. 2, SD controller is the physical logic units of SD data card communication, sends SD protocol formatted data to SD card for host computer.Serial ports controller be host computer for generation of and send the instruction of specific protocol form, this instruction for meeting UART form, so also can universal asynchronous receiving-transmitting transmitter be referred to as.Pin selection unit is used for the I/O pin of managing I/O unit, and outputs to different I/O pin for switching difference in functionality.
To sum up, the present invention, by the adjustment method of a kind of multiplexing SD interface of design, realizes the debugging of embedded device, gives interface reserved IO specially, effectively save plate level resource, can effectively debug again without the need to embedded chip on pin.
Although the foregoing describe the specific embodiment of the present invention; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present invention and change, should be encompassed in scope that claim of the present invention protects.
Claims (3)
1. an adjustment method for the multiplexing SD interface of embedded chip, is characterized in that:
The SD card interface of embedded chip is provided with clock cable, order wire, four data lines and a card and detects pin signal wire; Inner 6 IO using described clock cable, order wire and four data lines as three kinds of debugging interfaces are multiplexing for embedded chip; And there is a wireless module embedded chip inside, wireless module comprises a microprocessor to run radio protocol stack and some radio-frequency devices;
(1), in SD card insertion situation, SD drives and reads card that SD controller recognizes to detect pin be low, judges the insertion of SD card, described 6 IO are all switched to SD card function pin; Afterwards when CPU needs debugging extremely, then need to extract SD card, connect debugging interface, then the wireless module of the embedded chip inside of this CPU exception is connected with an other mobile device, after having connected this other mobile device end by wireless module from wireless connections to the embedded chip inside of this CPU exception send debug command, after the wireless module of the embedded chip inside of this CPU exception receives these debug commands, described 6 IO are all switched to three kinds of debugging interfaces and uses;
(2), under situation extracted by SD card, SD drives and reads card that SD controller recognizes detection pin for high, judges that SD card is extracted, described 6 IO is all switched to the IO function of three kinds of debugging interfaces; Afterwards when CPU is abnormal, because 6 IO all switch to three kinds of debugging interface functions, just can directly debug.
2. the adjustment method of the multiplexing SD interface of a kind of embedded chip according to claim 1, it is characterized in that: in described (1), after SD card inserts draw-in groove, the detection pin of SD draw-in groove can produce the potential change of a negative edge, now SD controller can by this plug-in card event notice to CPU, run SD card driver by CPU and complete initialization to SD card, initialization procedure includes the function corresponding IO in I/O cell being switched to SD card, make the clock of SD controller, order and data can stick into Serial Communication by these 6 IO and SD.
3. the adjustment method of the multiplexing SD interface of a kind of embedded chip according to claim 1, it is characterized in that: in described (2), after draw-in groove extracted by SD card, the detection pin of SD draw-in groove can produce the potential change of a rising edge, now this can be pulled out card event notice to CPU by SD controller, run SD card driver by CPU and complete anti-initialization to SD card, anti-initialization procedure includes and is divided into groups between two by the corresponding IO in I/O cell, switch to three kinds of debugging interface functions, draw these interfaces from SD draw-in groove fly line again, just can debug from outside.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112579460A (en) * | 2020-12-24 | 2021-03-30 | 中国航空工业集团公司西安航空计算技术研究所 | Multi-level debugging method based on multi-core embedded system |
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Application publication date: 20160106 |