JPH06103177A - Reception processing method/device and bus monitoring method - Google Patents

Abstract

PURPOSE:To prevent the malfunctions caused by the misreception of data by storing temporarily the data received via a bus in a buffer and then disusing the data stored in the buffer if the opposite party connected via the bus is not set in a transmission mode. CONSTITUTION:A microcomputer 2 stores temporarily the received data in a buffer and the decides whether an integrated circuit ICn is set in a transmission mode or not by checking the slave address transmitted by the microcomputer 2 itself. If the circuit ICn is set in a transmission mode, the microcomputer 2 receives the data stored in the buffer, if not, the data stored in the buffer are disused. Thus it is possible to prevent malfunctions, runaway, destruction, etc., of a system even if a reception mode is erroneously set by the disturbance in terms or hardware.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reception processing method and apparatus suitable for AV (audio / video) equipment, and a bus monitoring method.

[0002]

2. Description of the Related Art Conventionally, a microcomputer inside an AV device and each integrated circuit are connected by an I ² C (Inter IC) bus.

[0003]

In the above-described system using the I ² C bus, since the change in the transmission / reception state due to the disturbance is not monitored, the data that should have been transmitted is not received by the other party, and Then, the data was taken in, and problems such as malfunction, runaway, and system destruction occurred.

[0004] The use state of the I ² C bus, because it was checked only by hardware detection by I ² C bus interface circuit, not determine whether the being malfunctioning whether a correct behavior during. Therefore, the erroneous operation of the I ² C bus, there is a problem that an integrated circuit connected to the I ² C bus malfunctions.

Further, since the state of the I ² C bus is not always monitored, a malfunction of the I ² C bus due to disturbance causes
The integrated circuit connected to the I ² C bus may malfunction. Further, if an attempt is made to force the I ² C bus to operate at abnormal times, there is a possibility of a general call (sending unexpected data to all integrated circuits connected to the I ² C bus). It was dangerous.

A first object of the present invention is to prevent a malfunction even if the reception mode is mistakenly caused by a disturbance or the like despite the transmission mode.

A second object of the present invention is to provide a bus monitoring method capable of clarifying the bus usage state.

A third object of the present invention is to provide a bus monitoring method capable of constantly monitoring the bus status.

[0009]

According to a first aspect of the present invention, there is provided a reception processing method, wherein data received via a bus is temporarily stored in a buffer (for example, step S1 in FIG. 3) and the data is transmitted via the bus. It is checked whether the connected partner is in the transmission mode (for example, step S2 in FIG. 3), and if the partner is not in the transmission mode, the data stored in the buffer is discarded (for example, step S4 in FIG. 3). Characterize.

In the reception processing method according to the second aspect, the master temporarily stores the data received via the bus in a buffer (eg, step S1 in FIG. 3), and the master is connected via the bus. The slave is in the transmission mode (for example, step S2 in FIG. 3), and if the slave is not in the transmission mode, the master discards the data stored in the buffer (for example, step S4 in FIG. 3). Characterize.

A reception processing device according to a third aspect is connected via a bus to a buffer (for example, a buffer in the microcomputer 1 in FIG. 1) for temporarily storing data received via the bus. The other party is in the transmission mode, and if the other party is not the transmission mode, the control means for discarding the data stored in the buffer (for example, the microcomputer 1 that performs the processing of steps S2 and S4 in FIG. 3). It is characterized by being provided.

A bus monitoring method according to a fourth aspect of the present invention is characterized in that the master holds information indicating that during use of the bus (for example, the processing of steps S12 and S15 of FIG. 4).

The bus monitoring method according to a fifth aspect is characterized in that the voltage of the lines forming the bus is constantly monitored (for example, the process of step S32 in FIG. 8).

[0014]

In the receiving processing method of the first aspect of the present invention, the data received via the bus is temporarily stored in the buffer, and it is checked whether or not the partner connected via the bus is in the transmission mode. If the other party is not in the transmission mode, the data stored in the buffer is discarded.

In the reception processing method according to the second aspect of the present invention, the data received via the bus is temporarily stored in the buffer by the master, and whether the slave connected via the bus is in the transmission mode or not. If the slave is not in transmit mode as examined by the master, the data stored in the buffer is discarded by the master.

According to another aspect of the reception processing device of the present invention, the data received via the bus is temporarily stored in the buffer, and the control means determines whether the partner connected via the bus is in the transmission mode. If it is not the transmission mode, the data stored in the buffer is discarded.

In the bus monitoring method of the fourth aspect, the master holds information indicating that the bus is in use.

According to another aspect of the bus monitoring method of the present invention, the voltages of the lines forming the bus are constantly monitored.

[0019]

FIG. 1 shows an I ² C bus system which is an example of an apparatus used for implementing the reception processing method and the bus monitoring method of the present invention. The microcomputer 2 is connected to the integrated circuits IC1 to ICn via a serial clock line 4 and a serial data line 6 which form an I ² C bus. The microcomputer 2 and the integrated circuits IC1 to ICn have I ² C interface terminals SCL and SDA, respectively. The I ² C interface terminals SCL and SDA are connected to the serial clock line 4 and the serial data line 6, respectively. The microcomputer 2 is a master (communication start side), and the integrated circuits IC1 to ICn are slaves (side for which communication is designated).

FIG. 2 shows a format of data transmitted from the microcomputer 2 of FIG. 1 to the integrated circuit ICn. The slave address in FIG. 2 designates a slave and an operation mode (designation of a data reception mode or a data transmission mode) from the master. That is, when the R / W bit located at the end of the slave address is "0", it indicates the reception mode, and when it is "1", it indicates the transmission mode. The communication procedure between the microcomputer 2 and the integrated circuits IC1 to ICn is performed by hardware by the I ² C bus interface circuit, and the data reception mode and the data transmission mode are automatically determined.

FIG. 3 shows an embodiment of the reception processing method of the present invention. When the microcomputer 2 receives the data, it does not accept the data as it is but temporarily stores it in the buffer (step S1). Next, the microcomputer 2 determines whether or not the integrated circuit ICn is in the transmission mode by checking the slave address transmitted by itself (step S2). When the integrated circuit ICn is in the transmission mode, the data stored in the buffer is stored. Is accepted (step S3), and if it is not the transmission mode, the data stored in the buffer is discarded (step S4).

Therefore, even if the hardware is erroneously set to the reception mode due to a disturbance, malfunction, runaway, and system damage can be prevented.

FIGS. 4 and 5 show processing and monitoring processing executed during data transfer in one embodiment of the bus monitoring method of the present invention. The microcomputer 2 is I ² C
When data transfer via the bus is started, a start condition is first generated (step S11), and the bus busy flag is set to "1" (step S12). Subsequently, the microcomputer 2 transfers data (step S13), and when this is completed, generates a stop condition (step S14). Then, the microcomputer 2 sets the bus busy flag to "0".

The microcomputer 2 has, for example, about 16
The monitoring process of FIG. 5 is performed every ms. That is, when the I ² C bus interface circuit hardware-determines that the I ² C bus is operating (YES in step S21), the microcomputer 2 checks the bus busy flag (step S22). When the bus busy flag is "1", it means that the bus is operating due to data transfer, and therefore the microcomputer 2 determines that the bus is operating normally. If the bus busy flag is "0", the microcomputer 2 performs an abnormality process (step S23).

FIG. 6 shows an example in which the I ² C bus system is applied to a television receiver. The microcomputer 2 is a video processor 1 via an I ² C bus.
2, audio processor 16 and non-volatile memory 2
It is connected to 0 etc. The video processor 12, the audio processor 16, the non-volatile memory 20, and the like correspond to the integrated circuits IC1 to ICn in FIG. The microcomputer 2 also supplies RGB data for messages to the video processor 12 and supplies a control signal to the power supply 22. The video processor 12 outputs the RGB video signal that is the processing result to the CRT 14. The audio processor 16 outputs an audio signal as a processing result to the speaker 18.

The abnormality processing in step S23 of FIG. 5 by the microcomputer 2 in the I ² C bus system as shown in FIG. 6 is performed by resetting the integrated circuits such as the video processor 12, the audio processor 16 and the non-volatile memory 20, I ² C It reconnects the bus, retransfers data, restarts the system by turning the power off and on, and displays error messages. Therefore, it is possible to prevent malfunction of the entire system and destruction of the system.

FIG. 7 shows an example of an apparatus used for implementing another embodiment of the bus monitoring method of the present invention. The microcomputer 2 is the same as FIG. 1 in that it has I ² C interface terminals SDA and SCL, but is a terminal for checking the state, that is, the voltage of the serial clock line 4 and the serial data line 6 of the I ² C bus. S
The difference is that it has CLCK and SDACK.

FIG. 8 shows the processing of another embodiment of the bus monitoring method of the present invention. The microcomputer 2 performs the monitoring process of FIG. 8 every 16 ms, for example. That is, the microcomputer 2 checks whether the I ² S bus is in use (step S31), and if the bus is in use, ends the check. If the bus is not in use, the microcomputer 2 checks the voltage levels of the terminals SCLCK and SDACK (step S32), and both terminals are "H".
If it is (high voltage level) (“H” when the I ² C bus is not used), the check is ended, and if not, an abnormal process is performed (step S33). The microcomputer 2 may be a television receiver control microcomputer as shown in FIG. In this case, since communication between integrated circuits other than the microcomputer 2 is not performed, the microcomputer 2 can judge the use state of the I ² C bus. Abnormal processing is
As in the case described above, it is possible to prevent malfunction and destruction of the system as a whole, and it is possible to recover from malfunction.

Although the above embodiment relates to the I ² C bus, the present invention is not limited to this and can be applied to various buses.

[0030]

According to the reception processing method of the first aspect of the present invention, the data received via the bus is temporarily stored in the buffer, and whether or not the partner connected via the bus is in the transmission mode. Since the data stored in the buffer is discarded if the other party is not in the transmission mode, malfunction, runaway and system damage can be prevented even if the reception state is accidentally caused by a disturbance.

According to the reception processing method of the second aspect, the master temporarily stores the data received via the bus in the buffer, and the master determines whether the slave connected via the bus is in the transmission mode. If the slave is not in the transmission mode, the master discards the data stored in the buffer, preventing malfunction, runaway, and system damage even if the reception state is accidentally caused by a disturbance. be able to.

According to the third aspect of the present invention, the reception processing device checks whether or not the buffer for temporarily storing the data received via the bus and the partner connected via the bus are in the transmission mode. If is not the transmission mode, the control means for discarding the data stored in the buffer is provided, so that even if the reception state is mistakenly caused by a disturbance, malfunction, runaway, and system destruction can be prevented.

According to the bus monitoring method of the fourth aspect, since the information indicating that the bus is in use is held by the master, the use state can be clarified, so that the bus abnormality can be detected.

According to the bus monitoring method of the fifth aspect, the voltage of the lines forming the bus is constantly monitored.
Since the status of the bus can be constantly monitored, a bus abnormality can be detected.

[Brief description of drawings]

FIG. 1 is a block diagram showing an I ² C bus system which is an example of an apparatus used for implementing a reception processing method and a bus monitoring method of the present invention.

FIG. 2 is an integrated circuit I from the microcomputer 2 of FIG.
It is a figure which shows the format of the data transmitted to Cn.

FIG. 3 is a flowchart showing an embodiment of a reception processing method of the present invention.

FIG. 4 is a flowchart showing processing executed at the time of data transfer in an embodiment of the bus monitoring method of the present invention.

FIG. 5 is a flowchart showing a monitoring process in an embodiment of the bus monitoring method of the present invention.

FIG. 6 is a block diagram showing an example in which the I ² C bus system is applied to a television receiver.

FIG. 7 is a block diagram showing an example of an apparatus used for implementing another embodiment of the bus monitoring method of the present invention.

FIG. 8 is a flowchart showing a process of another embodiment of the bus monitoring method of the present invention.

[Explanation of symbols]

 2 Microcomputer 4 Serial Clock Line 6 Serial Data Line IC1 to ICn Integrated Circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Terashima 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (5)

[Claims] 1. A method for temporarily storing data received via a bus in a buffer, checking whether a partner connected via the bus is in transmission mode, and if the partner is not in transmission mode, A reception processing method characterized in that the data stored in the buffer is discarded. 2. The master temporarily stores the data received via the bus in a buffer, the master checks whether or not a slave connected via the bus is in a transmission mode, and the slave transmits the data. If the mode is not set, the master discards the data stored in the buffer. 3. A buffer for temporarily storing data received via a bus, and whether or not a partner connected via the bus is in a transmission mode. If the partner is not the transmission mode, A reception processing device, comprising: a control unit that discards the data stored in the buffer. 4. The bus monitoring method, wherein the master holds information indicating that while the bus is in use. 5. A bus monitoring method characterized by constantly monitoring the voltage of a line constituting a bus.