Flashing Circuit of Wireless Scanning Device

Abstract

The present invention provides a flashing circuit for a wireless scanning device, belonging to the technical field of flashing of scanning devices. The flashing circuit includes: a control unit, a latch, a power supply unit, an upgrade circuit, and a delay circuit; wherein, the latch is a 6-pin latch, the CLK pin and the D pin of the latch are respectively electrically connected to the control unit, the GND pin of the latch is grounded, the Q pin of the latch is electrically connected to the upgrade circuit, the VCC pin of the latch is electrically connected to the power supply unit, and the CLR pin of the latch is electrically connected to the data transmission interface through the delay circuit. The present invention realizes the flashing of the wireless scanning device through internal hardware, enabling users to enter the flashing state only by scanning a code, thus eliminating the time-consuming and laborious process of disassembling the machine, and at the same time overcoming the design defects of external dedicated pins.

Description

Technical Field

[0001] The present invention relates to the technical field of flashing of scanning devices, and particularly to a flashing circuit for a wireless scanning device. Background Art

[0002] In a wireless scanning device, if the device needs to update the complete software program, the whole machine needs to be powered off and restarted, and enter the flashing mode for flashing. When flashing, generally there are two options: 1. Disassemble the machine to control the wireless scanning device to enter the flashing state; 2. Externally lead out fixed pins, and control the wireless scanning device to enter the flashing state through the change of the external pins. The first method mentioned above is time-consuming and laborious, and is not conducive to users to update the device well; the second method mentioned above requires the device to have a separate fixed pin for triggering, the structural space is limited (it is impossible to arrange a dedicated pin outside the normal function), or the product definition is limited (from the user's perspective, a separate fixed pin is only used for low-probability flashing and is unacceptable), and the dedicated fixed pin may also be accidentally touched by the user, entering the flashing mode and misidentifying the abnormal state. Summary of the Invention

[0003] The present invention provides a flashing method and circuit for a wireless scanning device, so as to solve the problems of time-consuming, laborious and complex operation existing in the flashing process of the wireless scanning device in the prior art.

[0004] On the one hand, the present invention provides a flashing method for a wireless scanning device, including:

[0005] Obtaining a flashing preparation instruction;

[0006] Entering the state before flashing from the initial state according to the flashing preparation instruction;

[0007] Obtaining flashing data and entering the flashing state;

[0008] Clearing the state before flashing;

[0009] Completing the flashing;

[0010] Starting normally.

[0011] According to the flashing method for a wireless scanning device provided by the present invention, the wireless scanning device is equipped with a charging dock, the wireless scanning device and the charging dock can be detachably connected, the charging dock is connected to a control terminal and an external DC power supply, and a control unit, a latch, a power supply unit, a delay circuit and an upgrade circuit are arranged inside the wireless scanning device;

[0012] Among them, the latch is a 6-pin latch. The CLK pin and D pin of the latch are respectively electrically connected to the control unit. The GND pin of the latch is grounded. The Q pin of the latch is electrically connected to the upgrade circuit. The VCC pin of the latch is electrically connected to the power supply unit. The CLR pin of the latch is detachably connected to the charging base through a delay circuit.

[0013] According to a flashing method for a wireless scanning device provided by the present invention, the obtaining of the flashing preparation instruction includes:

[0014] Generating a barcode from the code of the flashing preparation instruction;

[0015] The wireless scanning device obtains the flashing preparation instruction by scanning the barcode.

[0016] According to a flashing method for a wireless scanning device provided by the present invention, before the wireless scanning device obtains the flashing preparation instruction, the initial state of the latch is: the CLR pin is at a high level, the CLK pin is triggered by a rising edge, the D pin is at a low level, and the Q pin outputs a low level.

[0017] According to a flashing method for a wireless scanning device provided by the present invention, after the wireless scanning device obtains the flashing preparation instruction, the control unit controls the latch to enter the state before flashing according to the flashing preparation instruction as:

[0018] The CLR pin is at a high level, the CLK pin is triggered by a rising edge, the D pin is at a high level, and the Q pin outputs a high level.

[0019] According to a flashing method for a wireless scanning device provided by the present invention, the method for obtaining flashing data is: connecting the wireless scanning device to the charging base, connecting the charging base to the control terminal, the flashing data is configured on the control terminal, and the flashing data is transmitted to the upgrade circuit through the latch.

[0020] According to a flashing method for a wireless scanning device provided by the present invention, when the flashing data is transmitted to the upgrade circuit, the upgrade circuit starts to enter the flashing state, and the transmission of the flashing data is synchronized with the flashing process.

[0021] According to a flashing method for a wireless scanning device provided by the present invention, when entering the flashing state, the state of the latch is:

[0022] The CLR pin is at a high level, the CLK pin is at a high level or a low level, the D pin is in any state, and the level output by the Q pin is the same as the level output before entering the flashing state.

[0023] A flashing method for a wireless scanning device provided by the present invention, the method for clearing the state before flashing is: the wireless scanning device is connected to a charging base, the charging base is connected to an external DC power supply, and the external DC power supply gives a low level to the CLR pin of the latch through the delay circuit, so that the latch clears the current state, and the Q pin of the latch outputs a low level.

[0024] A flashing method for a wireless scanning device provided by the present invention, the delay circuit is an RC circuit, which is used to delay the voltage of the external DC power supply to the latch after the upgrade circuit enters the flashing state for a preset time.

[0025] On the other hand, the present invention also provides a flashing circuit for a wireless scanning device, including: a control unit, a latch, a power supply unit, an upgrade circuit and a delay circuit;

[0026] Among them, the latch is a 6-pin latch. The CLK pin and D pin of the latch are respectively electrically connected to the control unit. The GND pin of the latch is grounded. The Q pin of the latch is electrically connected to the upgrade circuit. The VCC pin of the latch is electrically connected to the power supply unit. The CLR pin of the latch is electrically connected to the data transmission interface through a delay circuit.

[0027] A flashing circuit for a wireless scanning device provided by the present invention, a first resistor is connected in series on the connection line between the CLK pin of the latch and the control unit, and a second resistor is connected in series on the connection line between the D pin of the latch and the control unit.

[0028] A flashing circuit for a wireless scanning device provided by the present invention further includes a third resistor and a fourth resistor. The first end of the third resistor is connected to the line between the first resistor and the CLK pin of the latch, and the second end of the third resistor is grounded; the first end of the fourth resistor is connected to the line between the second resistor and the D pin of the latch, and the second end of the fourth resistor is grounded.

[0029] A flashing circuit for a wireless scanning device provided by the present invention, the second ends of the third resistor and the fourth resistor are connected in parallel and then grounded.

[0030] A flashing circuit for a wireless scanning device provided by the present invention, a fifth resistor is connected in series on the connection line between the Q pin of the latch and the upgrade circuit.

[0031] A flashing circuit for a wireless scanning device provided by the present invention, the CLR pin of the latch is also connected to the power supply unit through a sixth resistor.

[0032] A flashing circuit for a wireless scanning device provided by the present invention, the delay circuit includes a seventh resistor, an eighth resistor and a triode, the data transmission interface, the seventh resistor, the eighth resistor and the base of the triode are connected in series in sequence, the emitter of the triode is grounded, and the collector of the triode is electrically connected to the CLR pin of the latch.

[0033] A flashing circuit for a wireless scanning device provided by the present invention, the delay circuit further includes a ninth resistor, the first end of the ninth resistor is connected to the line where the eighth resistor is connected to the triode, and the second end of the ninth resistor is grounded.

[0034] A flashing circuit for a wireless scanning device provided by the present invention, the delay circuit further includes a first capacitor, the first end of the first capacitor is connected to the line where the seventh resistor is connected to the eighth resistor, and the second end of the first capacitor is grounded.

[0035] A flashing circuit for a wireless scanning device provided by the present invention, the first end of a second capacitor is connected to the connection line between the latch and the power supply unit, and the second end of the second capacitor is grounded.

[0036] The flashing method and circuit for the wireless scanning device provided by the present invention are designed for a specific structure in which the wireless scanning device is equipped with a charging stand. By designing a specific circuit structure inside the wireless scanning device and matching a specific flashing method, during flashing, the code of the flashing preparation instruction is pre-generated into a barcode, and the wireless scanning device is used to scan the barcode so that the control unit controls the latch to enter the state before flashing according to the flashing preparation instruction. Then the wireless scanning device is connected to the charging stand, the charging stand is connected to the control terminal and the external DC power supply, and the wireless scanning device enters the flashing state to complete the flashing. The present invention realizes the flashing of the wireless scanning device through internal hardware, enabling the user to enter the flashing state and complete the flashing only by scanning the code and connecting the wireless scanning device to the charging stand, thus eliminating the time-consuming and laborious process of disassembling the machine and overcoming the design defects of external dedicated pins at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0038] Figure 1 It is a schematic flow chart of the flashing method for the wireless scanning device provided by the present invention;

[0039] Figure 2 It is a module connection diagram during the flashing of the wireless scanning device provided by the present invention;

[0040] Figure 3 It is a schematic diagram of module connection inside the wireless scanning device provided by the present invention;

[0041] Figure 4 It is the flashing circuit diagram of the wireless scanning device provided by the present invention;

[0042] Figure 5 It is a diagram of the state change of the latch pins. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0044] The following combines Figures 1-5 to describe a flashing method and circuit of a wireless scanning device of the present invention. The wireless scanning device mentioned in the present invention includes intelligent devices with barcode scanning functions such as a scanning gun, a smart terminal, a handheld PDA, etc.

[0045] On the one hand, the present invention provides a flashing method for a wireless scanning device, including:

[0046] Obtaining a flashing preparation instruction;

[0047] Entering a state before flashing from the initial state according to the flashing preparation instruction;

[0048] Obtaining flashing data and entering the flashing state;

[0049] Clearing the state before flashing;

[0050] Completing the flashing;

[0051] Starting normally.

[0052] In this embodiment, the wireless scanning device is equipped with a charging stand. The wireless scanning device and the charging stand can be detachably connected. The charging stand is connected to a control terminal and an external DC power supply. A control unit, a latch, a power supply unit, a delay circuit and an upgrade circuit are arranged inside the wireless scanning device; wherein, the wireless scanning device, the charging stand and the control terminal can all be provided with wireless data transceiver modules for wirelessly transmitting the scanned barcode information; when the charging stand is connected to the control terminal and the external DC power supply, a data cable can also be used for wired connection, so that charging and data transmission can be carried out simultaneously; of course, the charging stand can also be omitted, and the control terminal and the wireless scanning device can be detachably connected directly by using a USB data cable;

[0053] Among them, the latch is a 6-pin latch. The CLK pin and D pin of the latch are electrically connected to the control unit respectively. The GND pin of the latch is grounded. The Q pin of the latch is electrically connected to the upgrade circuit. The VCC pin of the latch is electrically connected to the power supply unit. The CLR pin of the latch is detachably connected to the charging stand through a delay circuit;

[0054] The control unit can be regarded as a CPU. Two pins of the latch are electrically connected to two pins of the CPU respectively. The power supply unit is the battery inside the wireless scanning device, which is used for power supply when the wireless scanning device performs wireless scanning. The upgrade circuit is a conventional upgrade circuit.

[0055] Obtain the flashing preparation instruction, including:

[0056] Generate a barcode from the code of the flashing preparation instruction;

[0057] The wireless scanning device obtains the flashing preparation instruction by scanning the barcode.

[0058] Before the wireless scanning device obtains the flashing preparation instruction, the initial state of the latch is: the CLR pin is at high level, the CLK pin is triggered by the rising edge, the D pin is at low level, and the Q pin outputs low level;

[0059] The initial state of the latch can be controlled by the control unit or implemented by hardware. The above-mentioned wireless scanning device entering the state before flashing from the initial state refers to the change of the states of each pin of the latch.

[0060] After the wireless scanning device obtains the flashing preparation instruction, the control unit controls the latch to enter the state before flashing according to the flashing preparation instruction as follows:

[0061] The CLR pin is at high level, the CLK pin is triggered by the rising edge, the D pin is at high level, and the Q pin outputs high level;

[0062] In this state, that is, the state where the Q pin outputs high level, the upgrade circuit has made preparations for flashing, and it can start flashing immediately as soon as the flashing data arrives.

[0063] The way to obtain the flashing data is: connect the wireless scanning device to the charging stand, the charging stand is connected to the control terminal, the control terminal is configured with the flashing data, and the flashing data is transmitted to the upgrade circuit through the latch.

[0064] When the flashing data is transmitted to the upgrade circuit, the upgrade circuit starts to enter the flashing state, and the transmission of the flashing data is synchronized with the flashing process.

[0065] When entering the flashing state, the state of the latch is:

[0066] The CLR pin is at a high level, the CLK pin is at a high level or a low level, the D pin is in any state, and the level output by the Q pin is the same as the level output before entering the flashing process, remaining at a high level.

[0067] The method to clear the state before flashing is as follows: The wireless scanning device is connected to the charging base, the charging base is connected to an external DC power supply, and the external DC power supply gives a low level to the CLR pin of the latch through a delay circuit, causing the latch to clear the current state so that the Q pin of the latch outputs a low level.

[0068] Figure 5 A state change table showing the pin level conditions of the latch from the initial state - the state before flashing - the flashing state - the state of clearing the state before flashing is presented. Among them, H represents a high level, L represents a low level, "↑" represents a rising edge trigger, X represents any state, and Q0 represents maintaining the previous state.

[0069] The delay circuit is an RC circuit, used to delay the voltage of the external DC power supply to the latch after the upgrade circuit enters the preset time of the flashing state; among them, the preset time is adjustable, and the preset time is the delay time of the delay circuit.

[0070] In this embodiment, the voltage of the external DC power supply is 5V.

[0071] In this embodiment, when clearing the state before flashing, both the CLK pin and the D pin are in any state; in this step, the state of the Q pin of the latch is cleared;

[0072] In the previous step, that is, in the flashing state, the state of the Q pin of the latch is the same as the state before flashing, remaining at a high level state. When the Q pin maintains a high level state, if the upgrade circuit receives flashing data, it will automatically enter the flashing state. Therefore, if the high level state of the Q pin of the latch is not cleared, the upgrade circuit will enter an infinite loop flashing mode; during flashing, the control unit is in a non - working situation, so it is impossible to apply an instruction to the latch through the control unit to change the high level state of the Q pin; therefore, by giving a low level to the CLR pin of the latch through the external DC power supply, the latch can be made to clear the current state so that the Q pin of the latch outputs a low level; after clearing the state before flashing, the latch returns to the initial state; and the upgrade circuit will continue the flashing process. After the flashing process ends, without the Q pin of the latch outputting a high level, the wireless scanning device can be normally started.

[0073] The function of the delay circuit is to clear the current state of the latch after the upgrade circuit enters a stable flashing state. If the delay circuit is removed, then when the wireless scanning device is connected to the charging dock, the flashing data and voltage may be transmitted to the latch simultaneously, or even the voltage may be transmitted to the latch before the flashing data. This may cause the high-level state output by the Q pin of the latch to be cleared first, and then the upgrade circuit synchronously exits the flashing preparation. Then the flashing data is transmitted to the latch, ultimately resulting in the inability to perform flashing normally.

[0074] The flashing circuit of the wireless scanning device provided by the present invention will be described below. The flashing circuit of the wireless scanning device described below can be mutually corresponding and referred to the flashing method of the wireless scanning device described above.

[0075] On the other hand, the present invention provides a flashing circuit for a wireless scanning device, including: a control unit, a latch, a power supply unit, an upgrade circuit, and a delay circuit;

[0076] Among them, the latch is a 6-pin latch. The CLK pin and D pin of the latch are respectively electrically connected to the control unit. The GND pin of the latch is grounded. The Q pin of the latch is electrically connected to the upgrade circuit. The VCC pin of the latch is electrically connected to the power supply unit. The CLR pin of the latch is electrically connected to the data transmission interface through the delay circuit.

[0077] A first resistor R1 is connected in series on the connection line between the CLK pin of the latch and the control unit. A second resistor R2 is connected in series on the connection line between the D pin of the latch and the control unit.

[0078] The flashing circuit further includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is connected to the line between the first resistor R1 and the CLK pin of the latch, and the second end of the third resistor R3 is grounded. The first end of the fourth resistor R4 is connected to the line between the second resistor R2 and the D pin of the latch, and the second end of the fourth resistor R4 is grounded.

[0079] The second ends of the third resistor R3 and the fourth resistor R4 are connected in parallel and then grounded.

[0080] A fifth resistor R5 is connected in series on the line where the Q pin of the latch is electrically connected to the upgrade circuit.

[0081] The CLR pin of the latch is also connected to the power supply unit through a sixth resistor R6.

[0082] The existence of each of the above resistors is to keep each pin of the latch in the initial state in the form of hardware. Of course, the initial state of each pin of the latch can also be controlled by the control unit issuing instructions to the latch in the unbrushed state, but this will increase a certain amount of power consumption. The initial state of the latch is: the CLR pin is at a high level, the CLK pin is triggered by a rising edge, the D pin is at a low level, and the Q pin outputs a low level.

[0083] The delay circuit includes a seventh resistor R7, an eighth resistor R8, and a triode. The data transmission interface, the seventh resistor R7, the eighth resistor R8, and the base of the triode are connected in series in sequence. The emitter of the triode is grounded, and the collector of the triode is electrically connected to the CLR pin of the latch.

[0084] Among them, the data transmission interface is a USB interface; it can perform charging and data transmission simultaneously.

[0085] The delay circuit further includes a ninth resistor R9. The first end of the ninth resistor R9 is connected to the line where the eighth resistor R8 is connected to the triode, and the second end of the ninth resistor R9 is grounded.

[0086] The delay circuit further includes a first capacitor C1. The first end of the first capacitor C1 is connected to the line where the seventh resistor R7 is connected to the eighth resistor R8, and the second end of the first capacitor C1 is grounded.

[0087] The delay time of the delay circuit is calculated according to the formula t = RCln((U - Uc) / U), where t is the delay time, R is the resistor, C is the capacitor, U is the power supply voltage, Uc is the voltage on the capacitor, and RC is the product of the resistor and the capacitor;

[0088] That is, when the power supply voltage and the capacitor voltage are already determined, in this embodiment, by adjusting the size of R7*C1, the size of the delay time can be adjusted, and the delay time is the preset time mentioned above.

[0089] The first end of a second capacitor C2 is connected to the connection line between the latch and the power supply unit, and the second end of the second capacitor C2 is grounded; the second capacitor C2 is a filtering capacitor, and in other embodiments, the second capacitor C2 can be omitted.

[0090] In this embodiment, the values of R1, R2, R3, R4, R5, and R6 are all 10 kΩ, and there can be a 1% deviation;

[0091] R7 is 10 kΩ, R8 and R9 are 7 kΩ, and there can be a 1% deviation;

[0092] C1 is 10 μF, with a maximum voltage of 10 V; C2 is 0.1 μF, with a maximum voltage of 16 V, and the parameters of the two capacitors can have a 20% deviation;

[0093] In the triode, the maximum base voltage is 75V, the maximum emitter voltage is 40V, and the maximum collector voltage is 6V.

[0094] The parameter selection of each of the above components is not limited. It can be adjusted according to the actual situation as long as the working principle of the present invention can be achieved.

[0095] The flashing circuit of the wireless scanning device of the present invention has a simple circuit and strong reliability. When flashing, it needs to cooperate with an external charging stand. Specifically, the USB interface of the wireless scanning device is docked with the charging stand. For the structure of the charging stand and the specific flashing work process, refer to the flashing method of the wireless scanning device above, and no further elaboration will be made here.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A flashing circuit for a wireless scanning device, characterized in that: It includes a control unit, a latch, a power supply unit, an upgrade circuit and a delay circuit which are arranged inside the wireless scanning device; Wherein, the latch is a 6-pin latch, the CLK pin and D pin of the latch are electrically connected to the control unit respectively, the GND pin of the latch is grounded, the Q pin of the latch is electrically connected to the upgrade circuit, the VCC pin of the latch is electrically connected to the power supply unit, and the CLR pin of the latch is electrically connected to the data transmission interface through a delay circuit; Among them, a first resistor is connected in series on the connection line between the CLK pin of the latch and the control unit, and a second resistor is connected in series on the connection line between the D pin of the latch and the control unit; a first end of the third resistor is connected to the line between the first resistor and the CLK pin of the latch, and a second end of the third resistor is grounded; a first end of the fourth resistor is connected to the line between the second resistor and the D pin of the latch, and a second end of the fourth resistor is grounded; a second end of the third resistor is connected in parallel with a second end of the fourth resistor and then grounded; a fifth resistor is connected in series on the line connecting the Q pin of the latch and the upgrade circuit; and the CLR pin of the latch is also connected to the power supply unit through a sixth resistor; The delay circuit includes a seventh resistor, an eighth resistor and a triode, the data transmission interface, the seventh resistor, the eighth resistor and the base of the triode are connected in series in sequence, the emitter of the triode is grounded, and the collector of the triode is electrically connected to the CLR pin of the latch; the delay circuit also includes a ninth resistor, the first end of the ninth resistor is connected to the line connecting the eighth resistor and the triode, and the second end of the ninth resistor is grounded; the delay circuit also includes a first capacitor, the first end of the first capacitor is connected to the line connecting the seventh resistor and the eighth resistor, and the second end of the first capacitor is grounded; the connection line between the latch and the power supply unit is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded; Wherein, the wireless scanning device is equipped with a charging base, the wireless scanning device is separately connected to the charging base through a data transmission interface, and the charging base is connected to a control terminal and an external DC power supply; When flashing, the wireless scanning device obtains the flashing preparation instruction by scanning the barcode, and enters the state before flashing from the initial state according to the flashing preparation instruction; the wireless scanning device is connected to the charging base, the charging base is connected to the control terminal, and the control terminal is configured with the flashing data, and the flashing data is transmitted to the upgrade circuit through the latch; when the flashing data is transmitted to the upgrade circuit, the upgrade circuit starts to enter the flashing state, and the transmission of the flashing data is synchronous with the flashing process; The external DC power supply gives a low level to the CLR pin of the latch through a delay circuit, so that the latch returns to an initial state.

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