CN115694773A - Private CAN bus frame synchronization structure and atmosphere lighting flow control system built by same - Google Patents
Private CAN bus frame synchronization structure and atmosphere lighting flow control system built by same Download PDFInfo
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- CN115694773A CN115694773A CN202211375459.0A CN202211375459A CN115694773A CN 115694773 A CN115694773 A CN 115694773A CN 202211375459 A CN202211375459 A CN 202211375459A CN 115694773 A CN115694773 A CN 115694773A
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Abstract
The invention discloses a private CAN bus frame synchronization structure, which comprises a CAN sending unit and a CAN receiving unit which are connected through a bus, and is characterized in that the CAN sending unit and the CAN receiving unit form a private CAN network in a UARTonCAN mode, and stream data is sent between the CAN sending unit and the CAN receiving unit. An atmosphere light flow control system comprises a master control MCU which is used as a CAN transmitting unit and a CAN receiving unit which form a private CAN network in a UARTonCAN mode. The remarkable effects are as follows: the frame synchronization head is detected from the physical hardware layer by means of the detection function of the UART, so that the data of the synchronization head is omitted from the communication data, and a receiving end can directly use a DMA mode to receive high-efficiency batch data.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted LED light effect control, in particular to a private CAN bus frame synchronization structure and an atmosphere light flow control system built by the same.
Background
The vehicle-mounted atmosphere lamp becomes an indispensable important component of automotive interior, the traditional atmosphere lamp light control is a CAN/CAN FD communication protocol, and an IC integrating the CAN/CAN FD function is required to be selected; meanwhile, the CAN/CAN FD standard data protocol contains more check information in the aspect of reliability, so that the transmission efficiency is low, and the data transmission of large-scale lighting effect scenes is not facilitated.
The CAN/CAN FD communication protocol for controlling the light not only needs to select an IC integrating the CAN/CAN FD function; meanwhile, the CAN/CAN FD standard data protocol contains more check information in the aspect of reliability, so that the transmission efficiency is not high, and the data transmission of large-scale lighting effect scenes is not facilitated.
Aiming at the characteristics of the prior art, the inventor provides a solution for forming a light private control domain by utilizing a physical layer of a CAN/CAN FD and transmitting the light private control domain by using a private protocol in a UARTonCAN mode to form a private CAN network.
However, based on the difference of UART from standard CAN: the former is a "streaming data network" and the latter is a "packet data network". Therefore, before sending the 'streaming data' each time, the former needs to send the 'frame synchronization' data first, and the data transmission can be started after the states of the receiving end and the sending end are consistent. The former has hardware mechanism to ensure the synchronization of each frame head to form data packet without sending extra frame synchronization data.
For the private CAN bus such as UARTonCAN, if the standard UART "stream data" transmission mode is used, a sync header data needs to be constructed at the head of each frame of data, and when the receiving end decodes, the feature analysis must be performed byte by byte, so that the DMA mode cannot be used to perform efficient batch data reception, and when a high transmission rate is required, the traditional mode causes great waste to the CPU calculation power of the receiving end.
Due to the "streaming data" feature of the UART itself, the receiving end has no standard hardware mechanism to detect the frame synchronization header signal. Therefore, only by solving the problem of frame synchronization before the transmission of the stream data network, the efficient and accurate control of the private CAN bus on the optical flow of the atmosphere lamp CAN be realized.
Disclosure of Invention
The invention aims to provide a frame synchronization structure of a private CAN bus and an atmosphere light flow control system set up by the frame synchronization structure, which aim at a UARTonCAN private CAN bus and realize the frame synchronization of a receiving end and a sending end, thereby utilizing a physical layer of CAN/CAN FD to realize UART format private protocol transmission and forming a light private control domain, namely a technical scheme for forming a private CAN network by using a UARTonCAN mode.
If the technical scheme needs to be realized, a scheme needs to be found, and a frame synchronization header is detected from a physical hardware layer by means of a detection function of a certain UART, so that synchronization header data are omitted from communication data, and a receiving end can directly use a DMA mode to receive high-efficiency batch data.
In order to achieve the purpose, the invention adopts the following technical scheme: a private CAN bus frame synchronization structure comprises a CAN sending unit and a CAN receiving unit which are connected through a bus, and is characterized in that the CAN sending unit and the CAN receiving unit form a private CAN network in a UARTonCAN mode, and stream data is sent between the CAN sending unit and the CAN receiving unit:
and a frame synchronization level generator is also configured in the CAN network between the CAN transmitting unit and the CAN receiving unit, the frame synchronization level generator is used for transmitting long-period level to the CAN receiving unit, and the CAN receiving unit has a BUS ERROR ERROR interrupt function of UART.
Before uart sends data each time, the CAN sending unit generates a pull-down level to pull down a data line by using IO operation, keeps enough time as a frame synchronization head signal, and then starts to send normal data frame content.
In cooperation with it, the CAN receiving unit starts the UART BUS ERROR ERROR interrupt function: due to the standard of UART, the signal line must remain high in IDLE state, and once low level is entered, which means that data transmission is started, only 13bit data can be contained in one transmission process, and then the signal line must return to high state. If the BUS is still low beyond this limit, a BUS ERROR ERROR will be generated. By using the mechanism, after the CAN receiving unit receives a long-term low level each time, the CAN receiving unit enters a BUS ERROR interruption because of detecting an ERROR. In the interrupt function, frame reset synchronization is carried out, so that the receiving end and the transmitting end can keep synchronization, and the normal UART data receiving process in a DMA mode can be subsequently carried out.
The long-period level is a low level with a duration of >13bit baud rate time.
Furthermore, the external frame synchronization level generator has the defect of high cost, and the external frame synchronization level generator is required to be in clock synchronization with the CAN sending unit, so that the internal frame synchronization level generator is more economic and reasonable. The frame synchronization level generator is solidified in the CAN sending unit.
The structure is simple. The frame synchronization level generator dynamically reconfigures the IO mode of the UART every frame of data transmission.
Furthermore, an RXD sending end of the CAN sending unit is connected with a TX receiving end of the CAN receiving unit, and a TXD sending end of the CAN sending unit is connected with an RX receiving end of the CAN receiving unit;
the output terminal of the frame sync level generator is connected to the TXD transmit terminal. The communication interface of the CAN transmitting unit CAN be saved.
Furthermore, an RXD sending end of the CAN sending unit is connected with a TX receiving end of the CAN receiving unit, and an alternative MUX module is connected between a TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, and an output end of the alternative MUX module is connected with an RX receiving end of the CAN receiving unit.
The frame synchronization head low level is generated by GPIO2, and the output of the alternative MUX module is immediately switched into GPIO2 low level after the low level is generated through the cooperation of an external alternative MUX module and is transmitted to the CAN receiving unit. After the synchronous head is finished, the output of the alternative MUX module is switched back to the TXD to continue transmitting data.
The scheme reduces the calculation overhead ratio of the MCU, and the direct drive is small.
Furthermore, an RXD sending end of the CAN sending unit is connected with a TX receiving end of the CAN receiving unit, and an alternative MUX module and a monostable trigger are connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, an output end of the alternative MUX module is connected with an input end of the monostable trigger, and an output end of the monostable trigger is connected with an RX receiving end of the CAN receiving unit.
The frame synchronization head low level trigger signal is generated by GPIO2, the alternative MUX module is matched, after the low level is generated, the output of the alternative MUX module is immediately switched to GPIO2 low level, the level is transmitted to the monostable trigger, the monostable trigger generates a low level with a length of more than 13bit through hardware delay, and the low level CAN be finely adjusted by RC parameters of the monostable trigger and is output to the CAN receiving unit. After the monostable trigger outputs low level and finishes returning to steady state, the rising edge of the output of the monostable trigger triggers one interruption through the GPIO1, and the CAN sending unit logic is guided to continue sending data from the TXD.
According to the scheme, a dynamic configuration mode is not needed, extra timer resources are not needed to be consumed, the GPIO2 only needs to generate a falling edge signal once, timing is not needed, and the MCU calculation cost is minimum.
But needs to add a small amount of extra hardware circuit to match the function
The utility model provides an atmosphere light current control system, includes master control MCU, this master control MCU has the unanimous CAN receiving element of structure all the way at least through bus connection, and this CAN receiving element is connected with the CAN transceiver, and this CAN transceiver is connected with lamp node controller, and this lamp node controller drives LED lamp area, and each way CAN receiving element, CAN transceiver, lamp node controller and LED lamp area's the relation of connection is unanimous, and its key lies in:
the main control MCU is used as a CAN transmitting unit, and forms a private CAN network with a CAN receiving unit in a UARTonCAN mode, and 'stream data' is transmitted between the main control MCU and the CAN receiving unit:
and a frame synchronization level generator is also configured in the CAN network between the master control MCU and the CAN receiving unit and used for transmitting long-period level to the CAN receiving unit.
The frame synchronization head is detected from the physical hardware layer by means of the detection function of the UART, so that the data of the synchronization head is omitted from the communication data, and a receiving end can directly use a DMA mode to receive high-efficiency batch data. The technical effect of transmitting by using the physical layer of the CAN/CAN FD and the private protocol in the UART format is achieved, the light private control domain is formed, and the solution of forming the private CAN network by using the UARTonCAN mode is effectively supported.
Further, the long period level is a low level having a duration >13bit baud rate time.
Furthermore, the frame synchronization level generator is solidified in the CAN sending unit;
the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and the TXD sending end of the CAN sending unit is connected with the RX receiving end of the CAN receiving unit;
the output terminal of the frame sync level generator is connected to the TXD transmit terminal.
Or the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and an alternative MUX module is connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, and an output end of the alternative MUX module is connected with an RX receiving end of the CAN receiving unit;
or the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and an alternative MUX module and a monostable trigger are connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, an output end of the alternative MUX module is connected with an input end of the monostable trigger, and an output end of the monostable trigger is connected with an RX receiving end of the CAN receiving unit.
The invention has the remarkable effects that the invention provides a private CAN bus frame synchronization structure and an atmosphere light flow control system built by the same, and the frame synchronization head is detected from a physical hardware layer by virtue of the detection function of UART, so that the data of the synchronization head is saved in communication data, and a receiving end CAN directly use a DMA mode to receive high-efficiency batch data. The technical effect of transmitting by using the physical layer of the CAN/CAN FD and the private protocol in the UART format is achieved, the light private control domain is formed, and the solution of forming the private CAN network by using the UARTonCAN mode is effectively supported.
Drawings
FIG. 1 is a connection diagram of embodiment 1;
FIG. 2 is a connection diagram of embodiment 2;
FIG. 3 is a connection diagram according to embodiment 3;
FIG. 4 is a circuit diagram of a master MCU;
FIG. 5 is a circuit diagram of a CAN receiving unit combination;
FIG. 6 is a circuit diagram of a CAN transceiver;
fig. 7 is a circuit diagram of a lamp node controller.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
and a frame synchronization level generator is also configured in the CAN network between the CAN transmitting unit and the CAN receiving unit, the frame synchronization level generator is used for transmitting long-period level to the CAN receiving unit, and the CAN receiving unit has a BUS ERROR ERROR interrupt function of UART. Frame resetting and transmitting-receiving end synchronization are carried out in the error interrupt function, and then the normal receiving of the subsequent frame data is started.
The long-period level is a low level with a duration of >13bit baud rate time.
According to different settings of the CAN receiving unit, the long-period level CAN be any time length, such as 15-bit baud rate time and 20-bit baud rate time, and CAN also be a long-period high level, a pulse level and the like.
The frame synchronization level generator is solidified in the CAN sending unit.
Furthermore, an RXD sending end of the CAN sending unit is connected with a TX receiving end of the CAN receiving unit, and a TXD sending end of the CAN sending unit is connected with an RX receiving end of the CAN receiving unit;
the output terminal of the frame sync level generator is connected to the TXD transmit terminal.
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, and an output end of the alternative MUX module is connected with an RX receiving end of the CAN receiving unit.
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, an output end of the alternative MUX module is connected with an input end of the monostable trigger, and an output end of the monostable trigger is connected with an RX receiving end of the CAN receiving unit.
The atmosphere light flow control system based on the private CAN bus frame synchronization structure comprises a main control MCU as a CAN transmitting unit, the main control MCU is connected with at least three CAN receiving units via a bus,
as shown in fig. 4, 5, 6, and 7, TX0-TX2 and RX0-RX2 of the three-way UART port of the master MCU are respectively connected to three CAN receiving units, and transmit data to the three-way private CAN bus through CAN0_ H-CAN2_ H and CAN0_ L-CAN2_ L of the three CAN receiving units.
The first CAN receiving unit is connected with a CAN transceiver U6 through a CAN0_ H end and a CAN0_ L end, the CAN transceiver U6 is connected with the lamp node controller through a TX end and an RX end, and the lamp node controller drives the LED lamp strip.
The lamp node controller connected to the private CAN bus receives data through a CAN transceiver U6 and transmits the data to TX and RX pins of the lamp node controller, so that the control of light stream of the lamp strip is realized.
The main control MCU is used as a CAN transmitting unit, and forms a private CAN network with a CAN receiving unit in a UARTonCAN mode, and 'stream data' is transmitted between the CAN transmitting unit and the CAN receiving unit:
and a frame synchronization level generator is also configured in the CAN network between the master control MCU and the CAN receiving unit and used for transmitting the long-period level to the CAN receiving unit.
The long period level is a low level with a duration >13bit baud rate time.
The frame synchronization level generator is solidified in the CAN sending unit;
the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and the TXD sending end of the CAN sending unit is connected with the RX receiving end of the CAN receiving unit;
the output terminal of the frame sync level generator is connected to the TXD transmit terminal.
Or the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and an alternative MUX module is connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, and an output end of the alternative MUX module is connected with an RX receiving end of the CAN receiving unit;
or the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and an alternative MUX module and a monostable trigger are connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, an output end of the alternative MUX module is connected with an input end of the monostable trigger, and an output end of the monostable trigger is connected with an RX receiving end of the CAN receiving unit.
Finally, it is noted that: the above-mentioned embodiments are only examples of the present invention, and it is a matter of course that those skilled in the art can make modifications and variations to the present invention, and it is considered that the present invention is protected by the modifications and variations if they are within the scope of the claims of the present invention and their equivalents.
Claims (10)
1. A frame synchronization structure of a private CAN bus comprises a CAN sending unit and a CAN receiving unit which are connected through a bus, and is characterized in that the CAN sending unit and the CAN receiving unit form a private CAN network in a UARTonCAN mode, and stream data is sent between the CAN sending unit and the CAN receiving unit:
and a frame synchronization level generator is also configured in a CAN network between the CAN transmitting unit and the CAN receiving unit, the frame synchronization level generator is used for transmitting long-period level to the CAN receiving unit, and the CAN receiving unit has a BUS ERROR ERROR interrupt function of UART.
2. The private CAN bus frame synchronization structure of claim 1, wherein: the long-period level is a low level with a duration of >13bit baud rate time.
3. The private CAN bus frame synchronization structure of claim 1 or 2, wherein: the frame synchronization level generator is solidified in the CAN sending unit.
4. The private CAN bus frame synchronization structure of claim 3, wherein: the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and the TXD sending end of the CAN sending unit is connected with the RX receiving end of the CAN receiving unit;
the output terminal of the frame sync level generator is connected to the TXD transmit terminal.
5. The private CAN bus frame synchronization structure of claim 1 or 2, wherein: the system comprises a CAN transmitting unit, a CAN receiving unit, an RXD transmitting end of the CAN transmitting unit, an RX receiving end of the CAN receiving unit, an alternative MUX module and a data transmission module, wherein the RXD transmitting end of the CAN transmitting unit is connected with the TX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, and an output end of the alternative MUX module is connected with an RX receiving end of the CAN receiving unit.
6. The private CAN bus frame synchronization structure of claim 1 or 2, wherein: an RXD sending end of the CAN sending unit is connected with a TX receiving end of the CAN receiving unit, and an alternative MUX module and a monostable trigger are connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, an output end of the alternative MUX module is connected with an input end of the monostable trigger, and an output end of the monostable trigger is connected with an RX receiving end of the CAN receiving unit.
7. The utility model provides an atmosphere light current control system, includes master control MCU, this master control MCU has the unanimous CAN receiving element of structure all the way at least through bus connection, this CAN receiving element is connected with the CAN transceiver, this CAN transceiver is connected with lamp node controller, this lamp node controller drives LED lamp area, each way CAN receiving element, the connection relation in CAN transceiver, lamp node controller and LED lamp area is unanimous, its characterized in that:
the main control MCU is used as a CAN transmitting unit, and forms a private CAN network with a CAN receiving unit in a UARTonCAN mode, and 'stream data' is transmitted between the CAN transmitting unit and the CAN receiving unit:
and a frame synchronization level generator is also configured in the CAN network between the master control MCU and the CAN receiving unit and used for transmitting long-period level to the CAN receiving unit.
8. The ambience light flow control system as defined in claim 7, wherein: the long period level is a low level with a duration >13bit baud rate time.
9. An ambience light control system according to claim 7 or 8, characterized in that: the frame synchronization level generator is solidified in the CAN sending unit;
the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and the TXD sending end of the CAN sending unit is connected with the RX receiving end of the CAN receiving unit;
the output terminal of the frame sync level generator is connected to the TXD transmit terminal.
10. An ambience light flow control system according to claim 7 or 8, wherein:
or the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and an alternative MUX module is connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the TXD sending end is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with a first input end of the alternative MUX module, and an output end of the alternative MUX module is connected with an RX receiving end of the CAN receiving unit;
or the RXD sending end of the CAN sending unit is connected with the TX receiving end of the CAN receiving unit, and an alternative MUX module and a monostable trigger are connected between the TXD sending end of the CAN sending unit and the RX receiving end of the CAN receiving unit;
the CAN sending unit is also provided with a frame synchronization terminal GPIO2;
the transmitting end of the TXD is connected with a first input end of the alternative MUX module, the frame synchronization end GPIO2 is connected with the first input end of the alternative MUX module, an output end of the alternative MUX module is connected with an input end of the monostable trigger, and an output end of the monostable trigger is connected with an RX receiving end of the CAN receiving unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211375459.0A CN115694773A (en) | 2022-11-04 | 2022-11-04 | Private CAN bus frame synchronization structure and atmosphere lighting flow control system built by same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211375459.0A CN115694773A (en) | 2022-11-04 | 2022-11-04 | Private CAN bus frame synchronization structure and atmosphere lighting flow control system built by same |
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| CN115694773A true CN115694773A (en) | 2023-02-03 |
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| CN202211375459.0A Pending CN115694773A (en) | 2022-11-04 | 2022-11-04 | Private CAN bus frame synchronization structure and atmosphere lighting flow control system built by same |
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