JPH02138641A - Back-up device for development of digital signal processor - Google Patents

Abstract

PURPOSE:To shorten the time required for development of a digital signal processor DSP system by using the microcomputer input and output controllers to perform the pseudoexecution of communication of the serial data to a control microcomputer of a target system. CONSTITUTION:A serial input data control circuit 31 is prepared together with a serial input data selection circuit 33, and a serial output data control circuit 39. The circuit 31 inputs the serial data to a DSP 11, and a serial output data control circuit 19 receives the serial data from the DSP 11. As a result, a program concerned with the serial communication of the DSP 11 can be checked without using a target system. Thus it is possible to effectively develop the program of the serial communication for the DSP 11 regardless of the target system.

Description

[Detailed description of the invention] (a) Industrial application field The present invention is mainly directed to the development of a digital signal processor that processes input data in time series based on a predetermined algorithm and outputs it as time series data. The present invention relates to a development support device for a digital signal processor used.

(b) Conventional technology In general, information sources such as audio and images are often analog signals. A digital signal processing device (hereinafter referred to as a DSP system) processes this analog signal using a digital method.

Furthermore, in recent years, the use of LSI digital circuits has progressed rapidly, and it has become possible to easily realize a DSP system on a single chip. Furthermore, compared to analog signal processing, DSP systems are rapidly being put into practical use because they have features such as being able to process with higher precision, being able to obtain arbitrary characteristics stably and uniformly by setting parameters, and being able to do without adjustments. It has come to be The application range of this DSP system is audio signal processing,
It is widely used in various fields such as communication signal processing, measurement signal processing, image signal processing, seismic wave signal processing, and underwater acoustic signal processing.

For example, in the audio field, CDs (compact
As the digitization of audio signals progresses, DAT (disc) players and DAT (digital audio tape) players, which digitally process audio signals, are becoming more and more popular.
SP system has been put into practical use.

-e, since the DSP program controls each part of the hardware simultaneously in parallel using a microprogram, the DS
Developing P's program was extremely difficult. Furthermore, in the case of a DSP that handles time-series signals such as voice and audio, the final evaluation is not only done after program development but also after inputting actual voice data and audio signals. Therefore, in the development of a DSP system, a DSP development support device (in-circuit emulator) that can perform actual operation is essential.

FIG. 3 shows a schematic diagram of a DSP development system including a conventional DSP development support device. (1) is a conventional DSP development support device, which has functions such as loading, executing, stopping, and dumping DSP programs, dumping data, and updating DSP programs. (
2) is an evaluation chip that is installed on the DSP development support device (1) and actually executes the program. (3) is the target system that will ultimately be equipped with a DSP chip and perform digital signal processing, and from here inputs that are compatible with the input/output format of the DSP are sent from the DSP development support device (1) to the evaluation chip (2). is input. (5) is an input to the target system from the outside. Also,
(6) is an audio output in which data subjected to digital signal processing in the DSP is outputted to the outside via the DSP development support device (1) and the target system (3). Further, (4) is a host computer for controlling the operation of the DSP development support device. (7)
is installed on the target system, sends commands and parameters to the serial input section of the DSP (Eva Chip), and sends calculation results and status to the DsP (Eva Chip) (2).
This is a control microcontroller that reads data from a serial output section. The DSP (Ebachit 7') (2) and the control microcomputer (7) process data one after another by repeating serial communication.

Time series data is processed in the following steps. First, after the signal input to the target system from the audio input section (5) is A/D converted from analog to digital,
The signal is input to the DSP development support device (1), subjected to digital signal processing by the DSP, and then output again from the target system (3) through the audio output section (6).

Note that the delayed input data that is the source of the digital delay and the data processed by DSP (Evachip) digital signal processing are sequentially written into the external storage DRAM (8) provided on the target system (3). The data is read out and outputted from the audio output section (6) as needed as audio data having a digital signal-processed surround effect to the outside.

())) Problems to be Solved by the Invention DSP generally transmits various commands, parameters, etc. from the controller and role microcontroller on the target system to the DS.
It is often used as a coprocessor that performs communication by receiving input from the serial input section of the DSP and outputting the output to the control microcomputer from the serial output section of the DSP.

When using the DSP on the DSP development system (including the DSP development support device) shown in Figure 3 as a coprocessor for digital signal processing, at the stage of development E, the control microcontroller on the target system and the DSP There were many cases where serial communication between the devices did not work properly.

It is difficult to determine whether the cause is caused by the DSP or the control microcomputer, and it takes a lot of time to investigate the cause. In addition, these symptoms often appear only after the DSP and control microcontroller are connected on the target system, so even if you debug the DSP program and the control microcontroller program separately, the cause is very difficult to understand. hard.

(d) Means for Solving the Problems The present invention is a DSP development support device used for program development or system development of a DSP that inputs and outputs control signals and data to and from external equipment using a serial communication circuit, Select either a serial input data control circuit that generates input format data compatible with the DSP serial communication 7-ormat, data output from the serial input data control circuit, or serial data output from the external device. The device includes a serial input data selection circuit that outputs serial data to the DSP, and a serial output data control circuit that receives serial data output from the DSP to the external device.

(e) Serial data is input to the operational DSP from the serial input data control circuit, and the serial data is input to the serial output data control circuit.
By receiving serial data from SP, DS
Verification of a program related to serial communication of P can be performed without using a target system. That is, it is possible to efficiently develop a serial communication program in a DSP, regardless of the target system.

(F) Embodiment FIG. 1 shows a schematic diagram of a DSP development system including a DSP development support device according to an embodiment of the present invention. (10) is a DSP development support device according to the present invention, and this DSP development support device (IO) is equipped with an Evachip (11) that adds functions compatible with the DSP development support device to the DSP installed in the target system. has been done. Furthermore, DSP development support equipment! (10) On the top is a microcontroller input trace memory (35
), and a microcomputer output trace memory (36) which also serves as a serial output data trace memory. (3) is a target system connected to the DSP development support device (IO), and on this target system (3) is a control microcontroller (7) that controls serial communication with the DSP (EVA chip) (11). It is installed. The audio signal input from the audio input section (5) of the target system (3) is transmitted to the DSP (11
), digitally processed, and output to the target system (3). And the target system (3
) An audio signal is output from the audio output section (6) of the device. In the DSP, a control microcomputer (7) on the target system instructs the DSP (evaluation chip) (11) as to what kind of digital signal processing is to be performed on the audio signal.

(15) is a host computer for controlling the DSP development support device (10).

Figure 2 shows a DSP development support device (10) according to an embodiment of the present invention.
The block diagram is shown below.

(16) is a microcomputer that controls the entire DSP development support device (10), and communicates with the host computer (15) via a host interface (not shown). (11)
As mentioned above, the EVA chip operates in the same way as the DSP in the target system within the DSP development support system (10).
(17) is a sequence controller that controls the DSP (EVA chip) with instructions from the microcomputer (16).

(18) is an input conversion circuit, which includes an A/D converter (19) that digitizes the input analog data, and an input format conversion section (19) that converts the input digital data into a format compatible with the DSP. 20) and an input section (21) from the target system, and the outputs from these input conversion circuits (]8) (A/D converter (19),
One of the outputs of the input format conversion section (20) and the input section (21) is selected and input to the evaluation chip (11).

(23) is an input data trace memory that stores and traces input data from the input data selector (22) to the evaluation chip (11).

(24) is an output conversion circuit, which includes an output section (25) that outputs the data that has been digitally processed by the DSP (Eva chip) to the target system, and an output section (25) that outputs the data that has been digitally processed by the DSP (Eva chip) and converts the output data that has also been signal processed by the DSP (Eva chip). D/A converter (26) that converts A and outputs it as analog data
and an output formant converter (27) that converts output data signal-processed by a DSP (evaluation chip) into a predetermined digital format and outputs the same.

(28) is an output data trace memory that stores and traces output data signal-processed by a DSP (evaluation chip).

(29) is a control microcomputer (7) and DSP (Eva chip) provided on the target system (3)
(11) is an input section for signals from the microcomputer (7) on the target system, and (30) is an output section for signals to the microcomputer (7) on the target system.

(3t) is a microphone/input controller as a serial input data control circuit that generates serial data compatible with the serial communication format of DsP (Evachip), (39) is a microcontroller (7) of target system (3).
) is a microcomputer output controller as a serial output data control circuit that generates serial data for

This microcomputer output controller (39) is a DSP (1
1) to receive serial data to be output to the microcomputer (7).

Also, among the data input to the signal input section (29) from the microcomputer (7) on the target system and the input data generated in the microcomputer input controller (31), the input to the DSP (Eva chip) is serial input data. It is selected by the microcomputer interface input selector (33) on the selection circuit.

(34) is a microcomputer interface output selector as a serial output data selection circuit, and the evaluation chip (11)
From there, communication data (serial data) is output to the microcomputer (7) on the target system, and communication data (serial data) generated by the microcomputer output controller (39) and sent to the microcomputer (7) on the target system are selectively output.

(35) is the microcomputer interface input selector (3
(36) is a microcomputer input quadrase memory as a serial input data trace memory that stores and traces microcomputer communication input data of serial data to the EV chip (11) selected by the EV chip (3).
Microcomputer output trace memory (3) as a serial output data trace memory that stores and traces microcomputer communication output data, which is serial data output from 11) to the microcomputer (7) on the target system.
6).

(37) is a RAM controller (external storage means control means) for controlling the DRAM (12) as an external storage device of the Eva chip (11);
(12) Alternatively, a reflexini signal, which is a control signal for holding the data ↑ε, is output to a DRAM provided on the target system (not shown).

The data bus (38) also includes a microcomputer (16), a sequence controller (17), a DRAN1 controller (37), a microcomputer input controller (31), a microcomputer output controller (39), an input data trace memory (23), and an output A data trace memory (28), a microcomputer input trace memory (35), and a microcomputer output trace memory (36) are connected.

Now, this DSP development support device (10) operates by command input from the host computer (15).

From the host computer (15) to the DSP development support device (
10), the input in the input conversion circuit (18),
That is, although analog input is selected as data input, a command input is performed to determine whether to select digital input or input from the target system (3). Furthermore, the real data input (29) from the control microcomputer (7) on the target system (3) is selected as the serial data input to the DSP (Evachip) (21), but the Ds I) development support device (1)
0) A command is manually executed to select one of the serial input data generated by the microcomputer input controller (31) above using the microcomputer interface manual selector (33).

DSP development support equipment (l) without connecting to the target system
O) When debugging the microcomputer interface section that communicates serial data with the target system by itself, select the microcomputer input controller (31) as the serial input data, and simultaneously select the microcomputer output controller (39) and the microcomputer output trace. Memory (36
) to trace the serial data output from the DSP (EVA chip) (11). At this time, the DSL)
(EvaChimp) Check whether the communication protocol is correctly followed from (11) and that the serial data output from DSP (Evachip) (11) is correct with respect to the input from the microcomputer input controller (31). By checking whether the data is
Is the program for the microcomputer interface section of P (Evachip) (l]) operating correctly?j1
He is capable of recognition.

In addition, when verifying the serial communication program of the control microcomputer (7) on the target system (3), as shown in Figure 1, the DSP development support device (1)
0) and the target system (3). and,
From the host computer (5) to the DSP development support device (
10), select the output data of the microcomputer interface output selector (34) for the target system (3) from the microcomputer output controller (39), and select the formal input data (29) from the target system (3). Input to the microcomputer input card race memory (35). The control microcomputer (7) on the target system (3) outputs an output corresponding to the input from the microcomputer output controller (39) in response to a serial output request from the target system (3).
) can check whether the serial communication program is correct or not.

In this way, using the DSP development support device (10), I)
Serial communication program of SP (Evachip) (11) and control microcomputer on target system (7)
It is possible to check each serial communication program separately.

After confirming the operation of each serial communication program, we actually installed the control microcomputer (7) on the target system (3) and the CQ DSP (Evachip) on the DSP development support bag R (10). (1
1) Perform serial communication between them. At this time, the serial input from the control microcomputer (7) is sequentially recorded using the microcomputer input quadratic memory (35), and the serial output from the DSP (EVA chip) (11) is recorded sequentially using the microcomputer output quadratic memory (36). ) to record sequentially. As a result, the control microcomputer (7) and
Not only is it possible to perform hardware verification between the DSP (Evachip) (11), but also verification of the data generation process can be performed by examining the recorded communication contents.

Note that the data input from the analog input is digitized by the A/D converter (19) and input to the evaluation chip (11). Data input from the digital input is converted into a format compatible with the DSP by an input format converter (20) and input to the EV chip (11). The data output from the input conversion circuit (18) and selected by the input data selector (22) is simultaneously input to the evaluation chip and input to the input data trace memory (23).
).

Also, under the control of the microcomputer (16), the data stored in the input data trace memory (23) is sent to the evaluation chip (1) instead of the data from the input data selector (22).
1). For example, pattern data in which an error such as overflow or under 70- has occurred or is likely to occur in a calculation inside the DSP is input and analyzed.

The output data from the evaluation chip (11) is converted to a D/A converter 3 in the output conversion circuit (24) when it is an analog output.
(26), when outputting digital data in a predetermined 7-way digital communication, output formant converter (27); when outputting data directly to the target system, outputting from either the outputting unit (25) to the target system. do. Then, the target system (3) is
Data can be output and checked without being connected to the development support device (10). Further, by storing the data output from the output conversion circuit (21) in the output data trace memory (28), the output data subjected to digital signal processing by the DSP can be stored and confirmed S2.

If the data stored in the input data trace memory (23) and the output data trace memory (28) are used in correspondence, input data can be verified very strictly.

(g) Effects of the Invention As is clear from the above description, the present invention includes a microcomputer for control on the target system, a microcomputer input controller, and a microcomputer output controller that perform pseudo serial data communication. Programs related to serial communication can be verified without connecting the system to the DSP development support device. This makes it possible to streamline and shorten the development period of a DSP program or a DSP system.

Also, when the DSP development support device and target system are connected, serial communication between the DSP development support device and external devices on the target system can be verified by inputting commands from the host computer to the in-circuit emulator without going through the DSP program. Therefore, it is also possible to check the serial communication function between an external device and the DSP before developing a DSP program.

Furthermore, by equipping the DSP development support device with a trace memory for microcomputer input data or output data, the DS
By providing a trace function for serial communication between the P and external devices, it becomes possible to match and verify communication data input and output.

These functions make it possible to separately verify programs for the serial communication functions of the DSP and the external device (target system) that connects it.
SP programs or DSP systems can be developed efficiently.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a DSP development system including a DSP development support device according to an embodiment of the present invention, FIG. 2 is a block diagram of a DSP development support device according to an embodiment of the present invention, and FIG. 3 is a conventional DSP development system. 1 is a schematic configuration diagram of a development system. (10) ... DSP development support device, (11) ... Evachip (DSP), (12) ... DRAM, (15
)...Host computer, (16)...Microcomputer, (18) -Input conversion circuit, (19)...A y'
D converter, (20)... input format converter, (
21) Input section, (22) Input data selector, (23) Input data trace memory, (24
)...Output conversion circuit, (25)...Output section, (26
)...D/A converter, (27) - Output formanode converter, (28)... Output data trace memory, (
31)...Microcomputer input controller (serial input data control circuit), (33) -Microcomputer interface input selector (serial input data selection circuit), (
34)・Microcomputer interface output selector (serial output data selection circuit), (35)・Microcomputer input trace memory (serial input data trace, memory)
, (36)...Microcomputer output trace memory (serial output data trace memory), (39) Microcomputer output controller (serial output data control circuit),
(37)...DRAM controller.

Claims (3)

[Claims] (1) In a digital signal processor development support device used for program development or system development of a digital signal processor that inputs and outputs control signals and data to and from external devices using a serial communication circuit, the device must be compatible with the serial communication format of the digital signal processor. a serial input data control circuit that generates input format data; and a serial input that selects either the data output from the serial input data control circuit or the serial data output from the external device and outputs it to the digital signal processor. A digital signal processor development support device comprising a data selection circuit and a serial output data control circuit that receives serial data output from the digital signal processor to the external device. (2) The serial output data control circuit generates serial data to be output to the external device, and outputs either the data output from the serial data control circuit or the serial data output from the digital signal processor. 2. The digital signal processor development support device according to claim 1, further comprising a serial output data selection circuit that selects and outputs the serial output data to the external device. (3) a serial input data trace memory for storing serial data input from the serial input data control circuit or the external device to the digital signal processor; 3. The digital signal processor development support device according to claim 1, further comprising a serial output data trace memory for storing output serial data.