TWI765257B - Firmware update method and device for USB-PD charger - Google Patents

Abstract

The present invention relates to a firmware update method and device for a USB-PD charger. Provided is a method executed by a USB-PD charger, comprising: receiving a first message sent by a USB-PD master control device based on an update instruction received from a terminal device; verifying the USB-PD master control based on the first message When the device is legal, send the first confirmation message to the USB-PD host device, and jump from the user code space to the in-system programming program by using the USB-PD IC module of the USB-PD charger to execute the program index code space; receive a second message sent by the USB-PD host device based on the firmware update data received from the terminal device, and write the firmware update data in the second message into the user code space; and The USB-PD host device sends a second confirmation message, and jumps the indicator used by the USB-PD IC module of the USB-PD charger to execute the program from the system programming code space to the user code space.

Description

Firmware update method and device for USB-PD charger

The present invention relates to the field of chargers, and more particularly to a method and device for updating firmware for a USB-PD charger.

The USB-PD (USB Power Delivery, USB Power Delivery) protocol is a fast charging protocol proposed by the USB-IF (USB Implementers Forum, USB Developers Forum) Association, and the USB Type-C interface was born with the USB-PD protocol. . Through the USB-PD protocol and the USB Type-C interface, the USB-IF Association hopes to unify the fast charging specifications of all manufacturers, change the situation of manufacturers fighting each other, and realize the prospect of one charger adapting to all devices. Since its birth in 2014, USB-PD chargers have flourished, especially after Apple finally introduced support for the USB-PD protocol in the iPhone 11, the entire USB-PD charger market has ushered in a big explosion.

As the USB-PD protocol is continuously modified and improved, a USB-PD charger may not be compatible with the latest USB-PD protocol after a period of time. However, for charger manufacturers, the price of USB-PD IC (USB-PD Integrated Circuit, USB-PD integrated circuit) is higher than that of general charger IC, and if the USB-PD chargers listed earlier have loopholes, it is likely to lead to recalls and compensation. Therefore, charger manufacturers hope to be able to update the firmware of USB-PD chargers.

The traditional firmware update method requires the charger to provide additional dedicated programming pins, typically a clock signal SCL and a data signal line SDA. However, in the USB-PD charger, there are only Type-C signal lines to the outside, and no dedicated programming pins can be provided. Therefore, there is a need for a firmware update method and apparatus for a USB-PD charger.

Embodiments of the present invention provide a method and device for updating firmware for a USB-PD charger, which can utilize the USB Type-C interface to update the firmware of the USB-PD charger according to the USB-PD protocol.

In a first aspect, an embodiment of the present invention provides a method executed by a USB-PD charger, comprising: receiving a first message sent by a USB-PD host device based on an update instruction received from a terminal device; When verifying that the USB-PD host device is legitimate based on the first message, send a first confirmation message to the USB-PD host device, and use the USB-PD IC module of the USB-PD charger to execute the program's index from using The user code space jumps to the in-system programming code space; receives the second message sent by the USB-PD host device based on the firmware update data received from the terminal device, and updates the firmware in the second message Write the data into the user code space; and send the second confirmation message to the USB-PD host device, and use the USB-PD IC module of the USB-PD charger to execute the program index from the in-system programming code The space jumps to the user code space.

In a possible implementation of the first aspect, the first message includes encrypted information, and wherein verifying that the USB-PD host device is legitimate based on the first message includes: decrypting the encrypted information in the first message, and based on the decryption information to verify the validity of the USB-PD host device.

In a possible implementation of the first aspect, before receiving the second message sent by the USB-PD host control device based on the firmware update data received from the terminal device, the method further includes: receiving a message from the USB-PD host The third message is sent by the control device, and a third confirmation message is sent to the USB-PD host device, and the third message includes the number of data blocks of the firmware update data and the USB-PD IC module of the USB-PD charger. The update start address of the memory.

In a possible implementation of the first aspect, receiving the second message sent by the USB-PD host device based on the firmware update data received from the terminal device includes: sequentially receiving the number of data blocks of the firmware update data Corresponding multiple second sub-messages.

In a possible implementation of the first aspect, after sending the second confirmation message to the USB-PD host device, and after the USB-PD IC module of the USB-PD charger is Before the set of indicators for executing the program is jumped from the system programming code space to the user code space, the method further includes: receiving a request sent by the USB-PD host device based on the verification command received from the terminal device message; based on the request message, read the firmware update data from the user code space and send the firmware update data to the USB-PD host device for the USB-PD host device to send the firmware update data to the terminal device. for detecting consistency; and receiving a fourth message sent by the USB-PD host device based on the terminal device confirming the consistency of the firmware update data, and sending a fourth confirmation message to the USB-PD host device.

In a possible implementation manner of the first aspect, sending the firmware update data to the USB-PD host device includes: sequentially sending each data block of the firmware update data.

In a possible implementation of the first aspect, the communication between the USB-PD charger and the USB-PD host device is performed according to the USB-PD protocol via the USB Type-C interface, and the USB-PD host device Communication with the terminal device is via a UART (universal asynchronous receiver transmitter) interface.

In a second aspect, an embodiment of the present invention provides a method executed by a USB-PD host device, comprising: sending a first message to a USB-PD charger based on an update instruction received from a terminal device; receiving a first message from a USB-PD charger; The first confirmation message sent by the USB-PD charger when it verifies that the USB-PD host device is legitimate based on the first message, and the indicator that the USB-PD IC module of the USB-PD charger is used to execute the program is obtained from the user The code space jumps to the in-system programming code space; sends a second message to the USB-PD charger based on the firmware update data received from the terminal device; and receives a second message from the USB-PD charger in the second message The second confirmation message sent after the firmware update data of the USB-PD charger is written into the user code space, and the indicator that the USB-PD IC module of the USB-PD charger is used to execute the program jumps from the system programming code space into the user code space.

In a possible implementation of the second aspect, the first message includes encrypted information.

In a possible implementation of the second aspect, before sending the second message to the USB-PD charger based on the firmware update data received from the terminal device, the method further includes Including: sending a third message to the USB-PD charger, and receiving a third confirmation message sent by the USB-PD charger; and wherein, the third message includes the number of data blocks of the firmware update data and the USB-PD charger. The update start address of the memory of the USB-PD IC module.

In a possible implementation of the second aspect, sending the second message to the USB-PD charger based on the firmware update data received from the terminal device includes: sequentially sending data blocks corresponding to the number of data blocks of the firmware update data. Multiple second sub-messages.

In a possible implementation of the second aspect, after receiving the second confirmation message sent by the USB-PD charger after writing the firmware update data in the second message into the user code space, and Before the index used for executing the program by the USB-PD IC module of the USB-PD charger is jumped from the system programming code space to the user code space, the method further includes: based on the verification command received from the terminal device Send a request message to the USB-PD charger; receive the firmware update data read and sent by the USB-PD charger from the user code space, and send the firmware update data to the terminal device for checking consistency; and sending a fourth message to the USB-PD charger based on the terminal device confirming the consistency of the firmware update data, and receiving the fourth confirmation message sent by the USB-PD charger.

In a possible implementation of the second aspect, receiving the firmware update data read and sent by the USB-PD charger from the user code space includes: sequentially receiving each data block of the firmware update data.

In a possible implementation of the second aspect, the communication between the USB-PD charger and the USB-PD host device is performed according to the USB-PD protocol via the USB Type-C interface, and the USB-PD host device Communication with the terminal device is via the UART interface.

In a third aspect, an embodiment of the present invention provides a USB-PD IC module, including: a microcontroller core, a rewritable memory, a USB-PD data buffer, a VBUS control module, a USB-PD PD physical layer interface circuit, and UART/I2C interface circuit, and among them, the microcontroller core is respectively connected with rewritable memory, USB-PD protocol sending and receiving data buffer, VBUS control module, USB-PD physical layer Interface circuit, and UART/I2C interface The circuit is communicatively connected; the rewritable memory includes user code space and in-system programming code space; the USB-PD data buffer is used to buffer the data transmitted according to the USB-PD protocol; the VBUS control module is used for For charging control; the USB-PD physical layer interface circuit is used to communicate according to the USB-PD protocol through the USB Type-C interface; the UART/I2C interface circuit is used to communicate through the UART interface.

In a fourth aspect, an embodiment of the present invention provides a USB-PD charger, including the USB-PD IC module according to the third aspect, wherein the UART/I2C interface circuit in the USB-PD IC module is packaged and not in communication with the outside, and wherein the USB-PD charger is used to perform the method according to the first aspect.

In a fifth aspect, an embodiment of the present invention provides a USB-PD host device, including the USB-PD IC module according to the third aspect, wherein the USB-PD host device is configured to execute the second aspect. Methods.

In a sixth aspect, an embodiment of the present invention provides a system including the USB-PD charger according to the fourth aspect, the USB-PD host device according to the fifth aspect, and a terminal device.

As described above, the embodiments of the present invention update the firmware of the USB-PD charger through the terminal device and the USB-PD host device. Specifically, the terminal device can send the firmware update data to the USB-PD host device, and the USB-PD host device can forward the firmware update data to the USB-PD charger, so that only the USB Type-C interface needs to be USB-PD protocol to update the firmware of USB-PD chargers. In addition, the USB-PD charger can also send the firmware update data back to the terminal device via the USB-PD host device, so that the terminal device can perform a consistency check to verify the firmware update data in the USB-PD charger. Through the above methods, the firmware update of the USB-PD charger can be realized without the need to disassemble the USB-PD charger and provide a dedicated programming pin, and the consistency of the firmware update data can be ensured sex.

1~18, S401~S404, S501~S504: Steps

400,500: Method

CC, CC1, CC2: Channel configuration

GND: ground wire

VBUS: Power supply line

VDM1: First message

VDM2: Second (sub) message

VDM3: The third message

VDM4: The Fourth Message

The present invention can be better understood from the following description of the specific embodiments of the present invention in conjunction with the drawings, wherein: FIG. 1 is a schematic diagram of charging a USB-PD charger and a mobile device.

FIG. 2 shows a schematic diagram of firmware update of a USB-PD charger according to an embodiment of the present invention.

FIG. 3 shows a schematic diagram of the USB-PD IC module in FIG. 2 .

FIG. 4 shows a flowchart of a method 400 performed by a USB-PD charger according to an embodiment of the present invention.

FIG. 5 shows a flowchart of a method 500 performed by a USB-PD host device according to an embodiment of the present invention.

FIG. 6 shows a firmware update sequence diagram of a USB-PD charger according to an embodiment of the present invention.

Features and exemplary embodiments of various aspects of the invention are described in detail below. The following description covers numerous specific details in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a clearer understanding of the present invention by illustrating examples of the invention. The present invention is in no way limited to any specific configuration set forth below, but covers any modification, substitution and improvement of the relevant elements or components without departing from the spirit of the invention.

Figure 1 is a schematic diagram of charging a USB-PD charger and a mobile device. In FIG. 1, the hardware interface of the USB-PD charger may be a USB Type-C interface, and the USB Type-C interface may include VBUS (power supply line), CC (CC1 or CC2) (Channel Configuration, channel configuration) and GND (ground line), where VBUS and GND can provide a charging loop, and CC can be used to transmit protocol information between the source and sink. The USB-PD charger can be connected to a mobile device via a USB Type-C cable via the USB Type-C interface.

In the embodiment of the present invention, without adding additional resources, the USB Type-C interface and the USB-PD protocol of the USB-PD charger are fully utilized to provide a A method and device for updating firmware for a USB-PD charger. Specifically, a USB-PD IC module is defined, and through the terminal device running the USB-PD firmware update software, the USB-PD master device with the USB-PD IC module is used to update the USB-PD with the USB-PD. The firmware of the USB-PD charger of the IC module is updated. Therefore, it is possible to directly update the firmware of the USB-PD charger through the USB Type-C interface.

FIG. 2 shows a schematic diagram of firmware update of a USB-PD charger according to an embodiment of the present invention. According to an embodiment of the present invention, the USB-PD charger may include a USB-PD IC module, the USB-PD host device may include a USB-PD IC module, and the terminal device may run USB-PD firmware update software. In an embodiment, the terminal device may be a host PC. The terminal device and the USB-PD host device can communicate via the UART interface, and the USB-PD host device and the USB-PD charger can communicate via the USB Type-C interface.

FIG. 3 shows a schematic diagram of the USB-PD IC module in FIG. 2 . According to an embodiment of the present invention, the USB-PD IC module may include an MCU (Microcontroller, Microcontroller Unit) core, a multiple-rewritable memory, a USB-PD data buffer, a VBUS control module, and a USB-PD entity Layer interface circuit, and UART/I2C interface circuit. In an embodiment, the microcontroller core can be respectively connected with the rewritable memory, the USB-PD protocol transmit and receive data buffer, the VBUS control module, the USB-PD physical layer interface circuit, and the UART/I2C interface circuit. communicatively connected.

According to an embodiment of the present invention, the rewritable memory may include a user code space and an in-system programming code space. In an embodiment, the user code space may be used to store user program data, including firmware update data and the like. The in-system programming code space can be used for in-system programming during firmware updates. In an embodiment, the USB-PD data buffer may be used to buffer data sent according to the USB-PD protocol, eg, firmware update data, and the like. In an embodiment, the VBUS control module can be used for charging control.

According to an embodiment of the present invention, the USB-PD physical layer interface circuit may be used to communicate according to the USB-PD protocol via the USB Type-C interface. For example, the USB-PD physical layer interface circuit can be used for communication between the USB-PD charger and the USB-PD host device. in real In an embodiment, a UART/I2C interface circuit may be used to communicate via the UART interface. For example, a UART/I2C interface circuit can be used for communication between the USB-PD host device and the terminal device.

In an embodiment, the UART/I2C interface circuit of the USB-PD IC module in the USB-PD charger may be packaged and not communicate with the outside. In addition, the USB-PD physical layer interface circuit of the USB-PD IC module in the USB-PD charger can be used to communicate with external devices. For example, since the hardware interface of the USB-PD charger is only USB Type-C interface. In the embodiment, the UART/I2C interface circuit of the USB-PD IC module in the USB-PD host device can be used to communicate with the terminal device, and the USB-PD IC module in the USB-PD host device The USB-PD physical layer interface circuit can be used to communicate with the USB-PD charger.

FIG. 4 shows a flowchart of a method 400 performed by a USB-PD charger according to an embodiment of the present invention. In an embodiment, the method 400 performed by a USB-PD charger may include the following steps. In step S401, a first message sent by the USB-PD host device based on the update instruction received from the terminal device is received. In an embodiment, the first message may be a VDM (Vendor Define Message, vendor defined message) 1 defined according to the USB-PD protocol. For example, the first message VDM 1 may have the following message format.

In step S402, when verifying that the USB-PD host device is legitimate based on the first message, a first confirmation message is sent to the USB-PD host device, and the USB-PD IC module of the USB-PD charger is used to execute Program pointers jump from user code space to in-system programming code space. In an embodiment, the first message may include encrypted information, for example, the 26-byte identification data in the first message VDM 1 as described above may be encrypted information.

In an embodiment, verifying that the USB-PD host device is legitimate based on the first message may include: decrypting encrypted information in the first message, and verifying based on the decrypted information Verify that the USB-PD host device is legal. In the embodiment, by encrypting the identification data, it can be ensured that the USB-PD charger can identify the legitimate USB-PD host device. In addition, when other illegal devices send messages to the USB-PD charger and try to tamper with the USB-PD IC module of the USB-PD charger, the USB-PD charger can send a rejection message and prevent these illegal operations.

In step S403, a second message sent by the USB-PD host device based on the firmware update data received from the terminal device is received, and the firmware update data in the second message is written into the user code space. In an embodiment, before receiving the second message sent by the USB-PD host device based on the firmware update data received from the terminal device, the method 400 may further include: receiving a first message sent by the USB-PD host device Three messages, and a third confirmation message is sent to the USB-PD host device, and the third message includes the number of data blocks of the firmware update data and the update of the memory of the USB-PD IC module of the USB-PD charger start address.

In an embodiment, the second message may be VDM 2 defined according to the USB-PD protocol. For example, the second message VDM 2 may have the following message format.

In an embodiment, one data block may have 256 bytes of data. In addition, after the USB-PD charger receives the third message, the USB-PD charger can update the USB-PD IC in the USB-PD charger according to the updated starting address and the total number of data blocks in the third message. The memory of the module is set so that the corresponding storage space can be reserved to receive firmware update data.

In an embodiment, receiving the second message sent by the USB-PD host device based on the firmware update data received from the terminal device includes: sequentially receiving a plurality of third messages corresponding to the number of data blocks of the firmware update data message. In an embodiment, the third message may be based on VDM 3 defined by the USB-PD protocol. For example, the third message VDM 3 may have the following message format.

In an embodiment, the USB-PD charger can sequentially receive a plurality of third messages VDM 3 according to the data block numbers, and sequentially write the firmware update data in the third messages VDM 3 into the user code space of the memory. . In an embodiment, by dividing the firmware update data into data blocks for sending, more efficient and accurate data transmission can be achieved.

In step S404, a second confirmation message is sent to the USB-PD host device, and the indicator that the USB-PD IC module of the USB-PD charger is used to execute the program is jumped from the in-system programming code space to the user code space. In an embodiment, after the USB-PD charger writes all firmware update data into the user code space of the memory, a second confirmation message can be sent, and the index for executing the program can be changed from the in-system programming The code space jumps to the user code space. In this way, the USB-PD charger can be updated, and the implementation only needs to update the firmware of the USB-PD charger according to the USB-PD protocol through the USB Type-C interface.

In the embodiment, after sending the second confirmation message to the USB-PD host device, and after using the USB-PD IC module of the USB-PD charger to execute the program index jump from the in-system programming code space Before reaching the user code space, the method 400 may further include: receiving a request message sent by the USB-PD host device based on the verification command received from the terminal device; based on the request message, reading from the user code space Firmware update data and send firmware update data to USB-PD host device for USB-PD host device to send firmware update data to terminal device for checking consistency; and receive data from USB-PD host device The fourth message is sent based on the terminal device confirming the consistency of the firmware update data, and is sent to the The USB-PD host device sends a fourth confirmation message. For example, the fourth message VDM 4 may have the following message format.

In an embodiment, the firmware update data stored by the USB-PD charger is sent back to the terminal device, and the terminal device performs consistency detection on the firmware update data to ensure that the firmware update data received by the USB-PD charger is updated The information is correct. In an embodiment, sending the firmware update data to the USB-PD host device includes: sequentially sending each data block of the firmware update data. For example, the firmware update data can be sequentially sent to the USB-PD host device according to the data block numbers through the third message VDM 3 as described above, and then forwarded back to the terminal device. In an embodiment, the terminal device may sequentially perform consistency detection on each data block of the firmware update data. For example, the terminal device can continue to receive and detect the next data block when the corresponding data block is consistent, and can report an error when the corresponding data block is not consistent. When all data blocks of the firmware update data have completed the consistency check, it can be verified that the firmware update data received by the USB-PD charger is correct.

In an embodiment, the communication between the USB-PD charger and the USB-PD host device is performed according to the USB-PD protocol via the USB Type-C interface, and the communication between the USB-PD host device and the terminal device This is done via the UART interface. In this way, only the firmware of the USB-PD charger needs to be updated according to the USB-PD protocol through the USB Type-C interface.

FIG. 5 shows a flowchart of a method 500 performed by a USB-PD host device according to an embodiment of the present invention. In an embodiment, the method 500 performed by a USB-PD host device may include the following steps. In step S501, a first message is sent to the USB-PD charger based on the update instruction received from the terminal device. In an embodiment, the first message may be as described above VDM 1, and has the message format as described above.

In step S502, a first confirmation message sent by the USB-PD charger when verifying the validity of the USB-PD host device based on the first message is received, and the USB-PD IC module of the USB-PD charger is used for The pointer of the executing program jumps from the user code space to the in-system programming code space. In an embodiment, the first message may include encrypted information, for example, the 26-byte identification data in VDM 1 as described above may be encrypted information.

In step S503, a second message is sent to the USB-PD charger based on the firmware update data received from the terminal device. In an embodiment, before sending the second message to the USB-PD charger based on the firmware update data received from the terminal device, the method 500 further includes: sending a third message to the USB-PD charger, and receiving a third message from the USB-PD charger. - a third confirmation message sent by the PD charger; and wherein the third message includes the number of data blocks of the firmware update data and the update start address of the memory of the USB-PD IC module of the USB-PD charger. In an embodiment, the third message may be VDM 3 as described above, and may have a message format as described above. In an embodiment, the USB-PD host device may initialize the data block counter N=0.

In an embodiment, sending the second message to the USB-PD charger based on the firmware update data received from the terminal device includes sequentially sending a plurality of second sub-messages corresponding to the number of data blocks of the firmware update data. In an embodiment, the second sub-message may be VDM 2 as described above, and may have a message format as described above. In addition, after sending a second sub-message, the USB-PD host device can increment the data block counter N until all the second sub-messages are sent, and the data block counter N is equal to the number of data blocks of the firmware update data .

In step S504, receive the second confirmation message sent by the USB-PD charger after writing the firmware update data in the second message into the user code space, and enable the USB-PD charger of the USB-PD charger The indicator used by the IC module to execute the program jumps from the system programming code space to the user code space. In the embodiment, after the USB-PD host device receives the second confirmation message, the firmware update of the USB-PD charger can be completed, and therefore, only the USB-PD charger needs to be updated through the USB Type-C interface. agreement to change Firmware for the new USB-PD charger.

In an embodiment, after receiving the second acknowledgment message sent by the USB-PD charger after writing the firmware update data in the second message into the user code space, and after enabling the USB-PD charger's Before the index used by the USB-PD IC module for executing the program jumps from the system programming code space to the user code space, the method 500 further includes: charging the USB-PD based on the verification command received from the terminal device The device sends a request message; receives the firmware update data read and sent by the USB-PD charger from the user code space, and sends the firmware update data to the terminal device for checking consistency; and confirms the firmware based on the terminal device. The fourth message is sent to the USB-PD charger according to the consistency of the body update data, and the fourth confirmation message sent by the USB-PD charger is received.

In an embodiment, the firmware update data stored by the USB-PD charger is sent back to the terminal device, and the terminal device performs consistency detection on the firmware update data to ensure that the firmware update data received by the USB-PD charger is updated The information is correct. In an embodiment, receiving the firmware update data read and sent by the USB-PD charger from the user code space includes: sequentially receiving each data block of the firmware update data. For example, the USB-PD host device can receive the firmware update data in sequence according to the data block number through the third message VDM 3 described above and forward it back to the terminal device. In an embodiment, the terminal device may sequentially perform consistency detection on each data block of the firmware update data. For example, the terminal device can continue to receive and detect the next data block when the corresponding data block is consistent, and can report an error when the corresponding data block is not consistent. When all data blocks of the firmware update data have completed the consistency check, it can be verified that the firmware update data received by the USB-PD charger is correct.

In an embodiment, the communication between the USB-PD charger and the USB-PD host device is performed according to the USB-PD protocol via the USB Type-C interface, and the communication between the USB-PD host device and the terminal device This is done via the UART interface. In this way, only the firmware of the USB-PD charger needs to be updated according to the USB-PD protocol through the USB Type-C interface.

FIG. 6 shows firmware of a USB-PD charger according to an embodiment of the present invention Update timing diagram. According to an embodiment of the present invention, in step 1, the terminal device may send an update instruction to the USB-PD host device to indicate that the firmware of the USB-PD charger needs to be updated. In step 2, the USB-PD host device sends a first message VDM 1 to the USB-PD charger. In step 3, the USB-PD charger sends a confirmation message when verifying the validity of the USB-PD host device based on the encrypted information in the first message VDM 1, and jumps the indicator for executing the program from the user code space to In the system programming code space. In step 4, after receiving the first confirmation message, the USB-PD host device sends a second message VDM 2 to the USB-PD charger. In step 5, the USB-PD charger receives the second message VDM 2 and sends a confirmation message to the USB-PD host device. In step 6, the USB-PD host device notifies the terminal device to start sending firmware update data. In step 7, the terminal device sends firmware update data to the USB-PD host device. In step 8, the USB-PD host device sends a third message VDM 3 to the USB-PD charger. In step 9, the USB-PD charger writes the firmware update data into the user code space, and sends a confirmation message to the USB-PD host device. Also, steps 7-9 can be repeated until all firmware updates are sent to the USB-PD charger. In step 10, the USB-PD host device notifies the terminal device that all firmware update data have been sent.

In an embodiment, in step 11, the terminal device sends a verification command to the USB-PD host device to indicate that the firmware update data stored in the USB-PD charger is to be read. In step 12, the USB-PD host device sends a request message to the USB-PD charger. In step 13, the USB-PD charger reads the firmware update data from the user code space, and sends a third message VDM 3 to the USB-PD host device. In step 14, the USB-PD host device sends the firmware update data back to the terminal device, and the terminal device detects whether the firmware update data is consistent. Additionally, steps 11 to 14 can be repeated until all firmware updates are verified. In step 15, the terminal device sends an update completion instruction to the USB-PD host device to indicate the end of the update. In step 16, the USB-PD host device sends a fourth message VDM 4 to the USB-PD charger. In step 17, the USB-PD charger sends a confirmation message to the USB-PD host device, and jumps the pointer for executing the program from the in-system programming code space to the user code space. In step 18, the USB-PD host device notifies the terminal device to update the result bundle.

As described above, the embodiments of the present invention update the firmware of the USB-PD charger through the terminal device and the USB-PD host device. Specifically, the terminal device can send the firmware update data to the USB-PD host device, and the USB-PD host device can forward the firmware update data to the USB-PD charger, so that only the USB Type-C interface needs to be USB-PD protocol to update the firmware of USB-PD chargers. In addition, the USB-PD charger can also send the firmware update data back to the terminal device via the USB-PD host device, so that the terminal device can perform a consistency check to verify the firmware update data in the USB-PD charger. Through the above methods, the firmware update of the USB-PD charger can be realized without the need to disassemble the USB-PD charger and provide a dedicated programming pin, and the consistency of the firmware update data can be ensured sex.

While the present invention has been described with reference to the embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the patent application.

S401~S404: Steps

400: Method

Claims (16)

A method performed by a USB-PD charger, comprising: receiving a first message sent by a USB-PD host device based on an update instruction received from a terminal device, the first message including encrypted information; When the first message verifies that the USB-PD host device is legitimate, a first confirmation message is sent to the USB-PD host device, and the USB-PD IC module of the USB-PD charger is used to execute the program The indicator jumps from the user code space to the in-system programming code space, and decrypts the encrypted information in the first message, and verifies that the USB-PD host device is legal based on the decrypted information; Receive a second message sent by the USB-PD host device based on the firmware update data received from the terminal device, and write the firmware update data in the second message into the user program code space; and send a second confirmation message to the USB-PD host device, and use the USB-PD IC module of the USB-PD charger to execute the program index from the in-system programming code Space jumps to the user code space. The method of claim 1, wherein before receiving the second message sent by the USB-PD host device based on the firmware update data received from the terminal device, the method further comprises: receiving a third message sent by the USB-PD host device, and a third confirmation message is sent to the USB-PD host device, and wherein the third message includes the number of data blocks of the firmware update data and the update starting address of the memory of the USB-PD IC module of the USB-PD charger. The method of claim 2, wherein receiving the second message sent by the USB-PD host device based on the firmware update data received from the terminal device comprises: sequentially receiving and updating the firmware A plurality of second sub-messages corresponding to the number of data blocks of the data. The method of claim 1, wherein after sending a second confirmation message to the USB-PD host device, and after the USB-PD IC module of the USB-PD charger is used to execute the Before the index of the trip type is jumped from the in-system programming code space to the user code space, the method further includes: receiving by the USB-PD host device based on the data received from the terminal device. The request message sent by the verification command; based on the request message, read the firmware update data from the user code space and send the firmware update data to the USB-PD host device to for the USB-PD host device to send the firmware update data to the terminal device for checking consistency; and to receive confirmation of the firmware update by the USB-PD host device based on the terminal device A fourth message is sent according to the consistency of the data, and a fourth confirmation message is sent to the USB-PD host device. The method according to claim 4, wherein sending the firmware update data to the USB-PD host device comprises: sequentially sending each data block of the firmware update data. The method of claim 1, wherein the communication between the USB-PD charger and the USB-PD host device is performed according to a USB-PD protocol via a USB Type-C interface, and the USB - The communication between the PD master and the terminal equipment is carried out via the UART interface. A method performed by a USB-PD host control device, comprising: sending a first message to a USB-PD charger based on an update instruction received from a terminal device, the first message including encryption information; The first confirmation message sent by the PD charger when it verifies that the USB-PD host device is legitimate based on the first message, and the USB-PD IC module of the USB-PD charger is used to execute the program The pointer jumps from the user code space to the in-system programming code space; sends a second message to the USB-PD charger based on the firmware update data received from the terminal device; - The PD charger is writing the firmware update data in the second message The second confirmation message sent after the user code space, and the indicator that the USB-PD IC module of the USB-PD charger is used to execute the program jumps from the in-system programming code space to the user code space. The method of claim 7, wherein before sending the second message to the USB-PD charger based on the firmware update data received from the terminal device, the method further comprises: sending the USB - the PD charger sends a third message, and receives a third confirmation message sent by the USB-PD charger; and wherein the third message includes the number of data blocks of the firmware update data and the USB-PD The update start address of the memory of the USB-PD IC module of the PD charger. The method of claim 8, wherein sending the second message to the USB-PD charger based on the firmware update data received from the terminal device comprises: sequentially sending data related to the firmware update data A plurality of second sub-messages corresponding to the number of blocks. The method of claim 7, wherein a second acknowledgment sent by the USB-PD charger after writing the firmware update data in the second message into the user code space is received After the message, and before causing the pointer of the USB-PD IC module of the USB-PD charger for executing programs to jump from the in-system programming code space to the user code space, the method It also includes: sending a request message to the USB-PD charger based on the verification instruction received from the terminal device; receiving and sending the information read and sent by the USB-PD charger from the user code space the firmware update data, and send the firmware update data to the terminal device for checking consistency; and send the firmware update data to the USB-PD based on the terminal device confirming the consistency of the firmware update data The charger sends a fourth message, and receives a fourth confirmation message sent by the USB-PD charger. The method of claim 10, wherein receiving the firmware update data read and sent by the USB-PD charger from the user code space comprises: Each data block of the firmware update data is received in sequence. The method of claim 7, wherein the communication between the USB-PD charger and the USB-PD host device is performed according to a USB-PD protocol via a USB Type-C interface, and the USB - The communication between the PD master and the terminal equipment is carried out via the UART interface. A USB-PD IC module, comprising: a microcontroller core, a multiple-erasable memory, a USB-PD data buffer, a VBUS control module, a USB-PD physical layer interface circuit, and a UART/I2C interface circuit, And wherein, the microcontroller core is respectively connected with the rewritable memory, the USB-PD protocol sending and receiving data buffer, the VBUS control module, the USB-PD physical layer interface circuit, and the UART/I2C interface circuit is communicatively connected; the rewritable memory includes user code space and in-system programming code space; the USB-PD data buffer is used for buffering according to the USB- The data transmitted by the PD protocol; the VBUS control module is used for charging control; the USB-PD physical layer interface circuit is used to communicate according to the USB-PD protocol via the USB Type-C interface; the UART/I2C interface circuit is used for for communication via the UART interface. A USB-PD charger, comprising the USB-PD IC module according to claim 13, wherein the UART/I2C interface circuit in the USB-PD IC module is packaged and does not communicate with the outside, and Wherein, the USB-PD charger is used to execute the method according to any one of claim 1-6. A USB-PD host control device, comprising the USB-PD IC module according to claim 13, wherein the USB-PD host control device is used to execute the method according to any one of claim items 7-12 . A USB-PD update system includes the USB-PD charger according to claim 14, the USB-PD host device according to claim 15, and a terminal device.

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