CN100409149C - Connection channel device between PC machine and built-in equipment GPS module and communication method - Google Patents
Connection channel device between PC machine and built-in equipment GPS module and communication method Download PDFInfo
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- CN100409149C CN100409149C CNB200510030862XA CN200510030862A CN100409149C CN 100409149 C CN100409149 C CN 100409149C CN B200510030862X A CNB200510030862X A CN B200510030862XA CN 200510030862 A CN200510030862 A CN 200510030862A CN 100409149 C CN100409149 C CN 100409149C
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Abstract
A method for carrying out communication between PC computer and GPS module on embedded device includes making serial interface signal and external interface signal be converted with each other by conversion circuit, switching over switch module for setting up signal connection between GPS module and external interface on master board, setting CPU register of master board to cut off signal connection between serial interface on GPS module and CPU serial interface. The device used for realizing said method is also disclosed.
Description
Technical field
The present invention relates to the embedded device field, particularly built-in equipment GPS module field specifically is meant a kind of PC and built-in equipment GPS intermodule interface channel device and communication means.
Background technology
In the modern life, all used the GPS module on the various embedded devices, and in the prior art, the GPS module is independent plank.The Software tool of PC end test GPS module is tested the GPS module by card extender; The Software tool of upgrading GPS module (firmware) is upgraded to the GPS module by card extender.
See also shown in Figure 1.
The GPS test philosophy is: can the PC end has an application program (test.exe) to be used for testing GPS operate as normal.After the GPS Board Power up, Reset moves test.exe once then, on the interface of this Software tool choice menus is arranged, and configures serial ports, baud rate, hit OK button then, and test.exe begins the GPS veneer is tested automatically.Initialization was under the 38400bps state in the serial ports baud rate after GPS powered on, so, our baud rate of setting up serial ports is 38400bps, test.exe can be according to our setting initialization serial ports, send a NMEA command (this command is that the GPS under the 38400bps baud rate can discern) then, tell GPS that the serial ports baud rate is switched to 115200bps, send this order, test.exe switches to 115200bps to PC serial ports baud rate, and send Binary commands successively, at first send order reset GPS, wait a moment (approximately after the 200-300 millisecond), sending order allows GPS enter the Test pattern, GPS receives this order and enters the state of testing oneself (Signal Generator provide satellite-signal), and test result, sends to test.exe from serial ports, test.exe receives serial data and judges later on whether the GPS veneer satisfies standard, sends order at last and allows GPS get back to the Normal pattern.
GPS Firmware upgrading principle is: the PC end has the application program upgrade.exe GPS Firmware that is used for upgrading.At first on the interface of upgrade.exe, set up serial ports, baud rate, GPS Firmware file etc., give the GPS Board Power up then, setting boot select signal is high level, allow GPS enter burning pattern (also can send command allows GPS enter the burning pattern), Reset once, click the Excute button of upgrade.exe at last, begin GPS upgrading Firmware, the process of this upgrading also is to finish data transmission by the mode that sends and receive command, response between PC and GPS.
In above-mentioned prior art, have significant limitation: the embedded device that has some to have the GPS module, GPS module are not veneers independently, but beat on mainboard the part as mainboard (Main Board).The Software tool of the Software tool of at this moment original test GPS and upgrading GPS module (firmware) just all can't be directly to GPS module testing and upgrading.Generally speaking, embedded device all carries out data transmission by usb protocol and PC, and small and exquisite owing to the Mini USB interface, cost is low etc., and plurality of advantages is widely used on the various embedded devices.For the embedded device that is connected and has the GPS function by the Mini USB interface with PC, the serial communication of how finishing between PC and the GPS module just becomes an insoluble problem, has all brought very big difficulty for the test and the upgrade job of GPS module.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of can be directly to install GPS module on the embedded device mainboard test and upgrade, need not change or the upgrade software instrument, easy to operate, efficient is higher, cost is lower, applicable surface PC and built-in equipment GPS intermodule interface channel device and communication means comparatively widely.
In order to realize above-mentioned purpose, PC of the present invention and built-in equipment GPS intermodule interface channel device and communication means are as follows:
Interface channel device between the GPS module on this PC and the embedded device, comprise the serial ports that is connected with its CPU on the PC, embedded device mainboard and install GPS module on this mainboard, the serial ports of this GPS module is connected with the serial ports of mainboard CPU, its principal feature is, described interface channel device also comprises a change-over switch module that is connected with the serial ports of GPS module on the mainboard, this change-over switch module is connected with Mini USB interface on the mainboard, described change-over switch module comprises an on-off circuit that is connected with the serial ports of GPS module on the mainboard, this on-off circuit is connected with Mini USB interface on the mainboard by a commutation circuit, this commutation circuit also with the USB device controller of fast mainboard CPU be connected; The Mini USB interface is connected with serial ports on the described PC by a change-over circuit on the described mainboard, this change-over circuit is changed the rs 232 serial interface signal on the PC and this mainboard Mini USB interface signal mutually, the circuit of described change-over circuit for rs 232 serial interface signal and USB interface signal are changed mutually, described change-over circuit comprises the serial ports and a USB interface that is connected with mainboard Mini USB interface that are connected with serial ports on the PC, be connected by a RS232 module between serial ports on the described change-over circuit and the USB interface, three-pointswitch is connected with USB interface on the described change-over circuit.
The on-off circuit of the interface channel device between the GPS module on this PC and the embedded device can be diode, triode or programmable logic device (PLD), and the CPU on the described mainboard is the CPU of Intel PXA 27x series.
This uses above-mentioned lane device to carry out the method that signal is connected between PC and the built-in equipment GPS module, and its principal feature is that described method may further comprise the steps:
(1) start this change-over circuit, it is low level that described three-pointswitch is set to USB interface control pin, and the Mini USB interface signal of rs 232 serial interface signal on the PC and mainboard is changed mutually;
(2) change-over switch module on the embedded device mainboard is set, between the Mini USB interface of this GPS module and mainboard, sets up signal and be connected, may further comprise the steps:
(a) the control pin of described commutation circuit is set to low level, sets up signal and be connected between Mini USB interface and described on-off circuit;
(b) the control pin with described on-off circuit carries out the level setting and is changed to opening state, sets up signal and be connected between Mini USB interface and described GPS module;
(3) corresponding registers to mainboard CPU is provided with, and cuts off GPS module serial ports and is connected with signal between this CPU serial ports.
PC and the built-in equipment GPS intermodule interface channel device and the communication means of this invention have been adopted, since it is ingenious utilized on the embedded device mainboard intrinsic external interface and change-over switch module, and between the external interface of PC and embedded device mainboard, added a signaling conversion circuit, thereby solved the difficult problem that the GPS module on mainboard (Main Board) is beaten in test and upgrading, to the test of PC end or upgrade software instrument without any influence and restriction, realize the function of passage fully, and unrestrictedly repetitive operation (even testing or during upgrading), need not to start shooting again, simultaneously, suitable all the GPS modules of these apparatus and method are beaten the embedded device on mainboard (Main Board); Moreover, all hardware in these apparatus and method all is to have utilized existing equipment or wire rod, has reduced cost, and has simplified circuit, has reduced the complexity of software, has improved efficient.
Description of drawings
Fig. 1 is independent GPS module testing of the prior art and upgrading principle schematic.
Fig. 2 is the hardware circuit principle figure of the interface channel device between the GPS module on PC of the present invention and the embedded device.
Fig. 3 is the change-over circuit principle schematic of the interface channel device between the GPS module on PC of the present invention and the embedded device.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also shown in Figure 2, interface channel device between the GPS module on this PC and the embedded device, comprise the serial ports that is connected with its CPU on the PC 1, embedded device mainboard 2 and install GPS module 3 on this mainboard, the serial ports 31 of this GPS module 3 is connected with the serial ports 41 of mainboard CPU, wherein, described interface channel device also comprises a change-over switch module that is connected with the serial ports 31 of GPS module 3 on the mainboard 2, this change-over switch module is connected with external interface on the mainboard, this external interface is the Mini USB interface, this change-over switch module comprises an on-off circuit 5 that is connected with the serial ports 31 of GPS module 3 on the mainboard 2, this on-off circuit 5 is connected with Mini USB interface 7 on the mainboard 2 by a commutation circuit 6, this on-off circuit 5 can be diode, triode or programmable logic device (PLD), this commutation circuit 6 also is connected with the USB device controller 42 of described mainboard CPU, and this CPU is the CPU of Intel PXA 27x series; Mini USB interface 7 is connected with serial ports on the described PC 1 by a change-over circuit 8 on the described mainboard 2, this change-over circuit 8 is changed rs 232 serial interface signal and USB interface signal mutually, this change-over circuit 8 comprises the serial ports 81 and a USB interface 82 that is connected with mainboard Mini USB interface that are connected with serial ports on the PC 1, be connected by a RS232 module 83 between described serial ports 81 and the USB interface 82, three-pointswitch 84 is connected with USB interface on the described change-over circuit.
This uses above-mentioned lane device to carry out the method that signal is connected between PC and the built-in equipment GPS module and may further comprise the steps:
(1) start this change-over circuit 8, the external interface signals of rs 232 serial interface signal and mainboard 2 is changed mutually, this starts this change-over circuit and is: it is low level that described three-pointswitch 84 is set to USB interface 82 control pins;
(2) change-over switch module on the embedded device mainboard 2 is set, sets up signal and be connected between the external interface of this GPS module and mainboard, the described change-over switch module that is provided with on the embedded device mainboard 2 may further comprise the steps:
(a) the control pin of described commutation circuit 6 is set to low level, sets up signal and be connected between Mini USB interface 7 and described on-off circuit 5;
(b) the control pin with described on-off circuit 5 carries out the level setting and is changed to opening state, sets up signal and be connected between Mini USB7 interface and described GPS module 3;
(3) corresponding registers to mainboard CPU is provided with, and cuts off GPS module 3 serial ports 31 and is connected with signal between this CPU serial ports 41.
In the middle of reality is used, see also shown in Figure 3 because this embedded device type only has the Mini USB interface, therefore can only communicate by letter with PC by Mini USB, change-over circuit must an end be a serial ports, communicates by letter with PC, the other end is Mini USB, communicates by letter with embedded device.But final purpose of the present invention is to reach communicating by letter between PC serial ports and the GPS serial ports, so under this kind situation, Mini USB no longer has usb function, but is used for transmitting rs 232 serial interface signal.
To sum up tell, this change-over circuit must be finished following several function:
(1) level conversion.The rs 232 serial interface signal level (± 5V～± 15V) convert usb data line level 3V to.
(2) signal pin pin number conversion.Serial ports has 9pin, and we only use TX, RX, Ground.
(3) interface conversion.Use D+, TX, the RX that D-transmits serial ports of USB.
RS232 finishes above-mentioned functions (1), (2), (3).
(4) shielding USB function.USB_ID is set to low level (this function also can realize with software) on mainboard.
Function (4) is finished by means of a three-pointswitch.Dial the end to A when three-pointswitch, USB_ID is set to low level; Dial to B, USB_ID is set to high level.
In the middle of practical application, above-mentioned change-over circuit and two end interfaces can be integrated becomes a line, is easy to carry like this.
For commutation circuit 6, this commutation circuit 6 has a control pin to come the switching of control signal, adopts software or hardware approach can realize the control of control pin.
When adopting hardware mode, have a lot of elements can realize control to control pin, the three-pointswitch of employing shown in Figure 2 is wherein a kind of just:
(1) 84 groups of three-pointswitch are to B, and USB_ID is a high level, and the control pin of commutation circuit 6 is high, and the signal that Mini USB transmits sends the USB device controller 42 of CPU, and this moment, Mini USB used usb protocol transmission data.
(2) 84 groups of three-pointswitch are to A, and USB_ID is a low level, and the control pin of commutation circuit 6 is low, and the signal that Mini USB transmits sends to on-off circuit 5.
When adopting software mode, also there are a lot of methods can finish the control task of control pin, control such as the height of the output GPIO pin signal that CUP is set.
For on-off circuit 5, this on-off circuit 5 has a control pin to come the through and off of control signal, and the control of control pin is similar with the control method of commutation circuit 6 control pins.When adopting hardware mode, diode, triode, programmable logic device (PLD) etc. can realize this function.
(1) control pin is high (or low): on-off circuit 5 is open-minded, and signal arrives GPS module 3;
(2) control pin is low (or high): on-off circuit 5 disconnects (ending), and signal is blocked.
Adopt software mode to control, the best selector switch control characteristic element consistent with the switching controls of commutation circuit 6, on-off circuit 5 and commutation circuit 6 a GPIO pin signal can sharing CUP carries out software control like this.
In the middle of practical application, also need to carry out following software setting:
1. in the time of test or upgrading GPS module 3, must " disconnections " CPU serial ports 41 (Standard UART) and " contact " of GPS serial ports 31, reach this purpose with the several signals between software setting CPU and the GPS.
2. when using the GPS function, for fear of issuable interference, in this preferred embodiment, should " disconnect " " signal is connected " of Mini USB interface 7 and the serial ports 31 of GPS module 3, can adopt following method:
(1) uses hardware switch, adopt on-off circuit 5 as shown in Figure 2;
(2) utilization has the device of path handoff functionality, or is equivalent to the device of switch, controls with software.The present invention utilizes existing hardware, has selected programmable logical block CPLD (Complex Programmable Logic Device).
3. signal controlling explanation:
The present invention maximally utilises existing hardware, has also reduced the complexity of software simultaneously, no matter adopts what model C PU, only needs to be provided with several GPIO (generial-purpose I/O) and just can realize.
That (1) this type adopts is Intel PXA 27x series a CPU wherein, GPIO is set need fills in relevant register and can finish, and the present invention relates to following several register.
A.GPDRx (x=0,1,2,3): the direction (input/output) that GPIOs is set
B.GPSRx (x=0,1,2,3): output GPIOs is set is output as height.
C.GPCRx (x=0,1,2,3): output GPIOs is set is output as low.
D.GAFRx_L/GAFRx_U (x=0,1,2,3): the Alternate Functions that GPIOs is set.
(2) concrete grammar of register is set: this CPU is 121 GPIO altogether, each register all is 32, a physical address is all arranged, this physical address is mapped to after the virtual address through the memory headroom map unit, we can write this virtual address to one 32 data, we have just write certain register to data like this, 32 bit data just controlled GPIO.
So the corresponding GPIO. of each of a.GPDRx, GPSRx and GPCRx:GPDRx, GPSRx and GPCRx, every kind of register all has 4,32 GPIOs of each register controlled.
B.GAFRx_L/GAFRx_U:GAFRs is GPIO of per 2 correspondences, so, 8 altogether of GAFRs, 16 GPIOs of each register controlled.
No matter be input or output, GPIOs has three kinds of Alternate functions.So the every two bits that writes GAFRs is represented following implication:
00：GPIO
01：Alternate?Function?1
10：Alternate?Function?2
11：Alternate?Function?3
Annotate: the corresponding relation of GPDRx/GPSRx/GPCRx and GAFRx_L/GAFRx_U: illustrate, controlling the direction of these 32 GPIOs of GPIO0--GPIO31 such as GPDR0, so, GAFR0_L is controlling the Alternate Functions of GPIO0--GPIO15, and GAFR0_U is controlling the Alternate Functions of GPIO15--GPIO31.
By above operation, just finished control to signal.
Adopted the interface channel devices and methods therefor between the PC of this invention and the GPS module on the embedded device, since it is ingenious utilized on the embedded device mainboard 2 intrinsic external interface and change-over switch module, and between the external interface of PC and embedded device mainboard, added a signaling conversion circuit 8, thereby solved the difficult problem that the GPS module on mainboard (MainBoard) is beaten in test and upgrading, to the test of PC end or upgrade software instrument without any influence and restriction, realize the function of passage fully, and unrestrictedly repetitive operation (even testing or during upgrading), need not to start shooting again, simultaneously, suitable all the GPS modules of these apparatus and method are beaten the embedded device on mainboard (Main Board); Moreover, all hardware in these apparatus and method all is to have utilized existing equipment or wire rod, has reduced cost, and has simplified circuit, has reduced the complexity of software, has improved efficient.
In this instructions, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (3)
1. the interface channel device between the GPS module on PC and the embedded device, comprise the serial ports that is connected with its CPU on the PC, embedded device mainboard and install GPS module on this mainboard, the serial ports of this GPS module is connected with the serial ports of mainboard CPU, it is characterized in that, described interface channel device also comprises a switching switch module that is connected with the serial ports of GPS module on the mainboard, this change-over switch module is connected with a Mini USB interface on the mainboard, described change-over switch module comprises an on-off circuit that is connected with the serial ports of GPS module on the mainboard, this on-off circuit switches circuit by one and is connected with Mini USB interface on the mainboard, and this commutation circuit also is connected with the USB device controller of described mainboard CPU; The Mini USB interface is connected with serial ports on the described PC by a change-over circuit on the described mainboard, this change-over circuit is changed the rs 232 serial interface signal on the PC and this mainboard Mini USB interface signal mutually, the circuit of described change-over circuit for rs 232 serial interface signal and USB interface signal are changed mutually, described change-over circuit comprises a serial ports and a USB interface that is connected with mainboard Mini USB interface that is connected with serial ports on the PC, be connected by a RS232 module between serial ports on the described change-over circuit and the USB interface, three-pointswitch is connected with USB interface on the described change-over circuit.
2. the interface channel device between the GPS module on PC according to claim 1 and the embedded device, it is characterized in that, described on-off circuit is diode, triode or programmable logic device (PLD), and the CPU on the described mainboard is the CPU of IntelPXA 27x series.
3. one kind is used the described lane device of claim 1 to carry out the method that signal is connected between PC and the built-in equipment GPS module, it is characterized in that described method may further comprise the steps:
(1) start this change-over circuit, it is low level that described three-pointswitch is set to USB interface control pin, and the Mini USB interface signal of rs 232 serial interface signal on the PC and mainboard is changed mutually;
(2) change-over switch module on the embedded device mainboard is set, between the Mini USB interface of this GPS module and mainboard, sets up signal and be connected, may further comprise the steps:
(a) the control pin of described commutation circuit is set to low level, sets up signal and be connected between Mini USB interface and described on-off circuit;
(b) the control pin with described on-off circuit carries out the level setting and is changed to opening state, sets up signal and be connected between Mini USB interface and described GPS module;
(3) corresponding registers to mainboard CPU is provided with, and cuts off GPS module serial ports and is connected with signal between this CPU serial ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200510030862XA CN100409149C (en) | 2005-10-28 | 2005-10-28 | Connection channel device between PC machine and built-in equipment GPS module and communication method |
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| CNB200510030862XA CN100409149C (en) | 2005-10-28 | 2005-10-28 | Connection channel device between PC machine and built-in equipment GPS module and communication method |
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| CN1955888A CN1955888A (en) | 2007-05-02 |
| CN100409149C true CN100409149C (en) | 2008-08-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101482852B (en) * | 2008-01-09 | 2011-08-10 | 华硕电脑股份有限公司 | Computer system with multimedia interface apparatus |
| CN102761455A (en) * | 2011-04-28 | 2012-10-31 | 上海博泰悦臻电子设备制造有限公司 | Method and system for testing GPS (global positioning system) panel |
| CN105955908B (en) * | 2016-04-21 | 2019-03-15 | 北京国旺盛源智能终端科技有限公司 | One kind connects for realizing Multi-serial port equipment and monitoring method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1287313A (en) * | 1999-09-02 | 2001-03-14 | 阿尔卑斯电气株式会社 | Connecting apparatus for external equipments |
| CN1417681A (en) * | 2001-11-07 | 2003-05-14 | 旺玖科技股份有限公司 | Universal serial bus (USB) connection detecting circuit system and its operation method |
| JP2004185584A (en) * | 2002-12-04 | 2004-07-02 | Hagiwara Sys-Com:Kk | Card adaptor control device, usb controller and card adaptor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1287313A (en) * | 1999-09-02 | 2001-03-14 | 阿尔卑斯电气株式会社 | Connecting apparatus for external equipments |
| CN1417681A (en) * | 2001-11-07 | 2003-05-14 | 旺玖科技股份有限公司 | Universal serial bus (USB) connection detecting circuit system and its operation method |
| JP2004185584A (en) * | 2002-12-04 | 2004-07-02 | Hagiwara Sys-Com:Kk | Card adaptor control device, usb controller and card adaptor |
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