JPH0435955Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a programmable small electronic computer equipped with a program list tracing function for debugging the program list.

[Prior art and its problems] The program list display function in conventional programmable small electronic calculators simply displays the program list on the display screen in the order of line numbers, and there are branches in the program. In this case, it was necessary to specify and read the branch destination line of the program, which was inconvenient for searching for bugs in the program.

[Purpose of the invention] This invention was made in view of the above-mentioned circumstances, and the purpose is to provide a programmable small electronic calculator that can trace and display a program list in the same flow as when the program is executed.

[Key points of the invention] In order to achieve the above purpose, this invention determines the program to be read next according to the position of the cursor that points to a specific part of the program data displayed on the display when the trace key is operated. The main point is that a program reading means for selecting an address is provided.

[Embodiment] An embodiment of this invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of this embodiment. In the figure,
Reference numeral 1 denotes a program memory section, in which program data using the following BASIC language, for example, is stored as a user program.

10 A=123 20 INPUTB 30 IF A=B THEN 100 40 PRINT “OK” 50 END 100 PRINT A, B; 110 PRINT “NG” 120 GOTO 20 2 is the display buffer, and 3 is the display section. This display section 3 is capable of displaying only one line of program data.

4 is a buffer, and the latest four lines of program line numbers traced and displayed in the forward direction of the list are stored in the display section 3. The address to this buffer 4 is indicated by a pointer 5. This pointer 5 is incremented by one for each request for forward tracing of the list. The current line number register 6 stores the current line of the program being traced.

7 is the key input section, including the list key LIST, forward trace key ELT, and backward trace key.
Equipped with BLT. The list key LIST is used to call the first line of the selected program list. The forward trace key FLT is used to trace the program list in the forward direction. The backward tracing key BLT is used to trace the program list in the backward direction.

8 is a cursor pointer indicating the cursor position.

Reference numeral 9 denotes a CPU that controls the entire device, and executes predetermined processing in response to input from the key input section 7, and checks the data at the cursor position indicated by the cursor pointer 8, thereby updating the program memory section 1.
Call the program data of the desired line number from , or use pointer 5 to call buffer 4.
, the contents of the buffer 4 and the current line number register 6 are updated as the trace is executed, and the program data of the current line number is sent to the display buffer 2 to be displayed on the display unit 3. .

Next, the operation of this embodiment configured as above will be explained with reference to FIGS. 2 to 4.

First, the user presses the list key LIST on the key input section 7 to refer to the program list.
As a result, as shown in FIG. 4, the program data of the first line of the program list, in this case line number "10", is displayed. At this time, the input cursor is at the beginning of the line. Also, the current line number register 6
The line number "10" is also stored in the CPU 9.

Next, as shown in FIG. 4, when the forward trace key FLT is pressed, the program data of the next line number "20" on the program list is displayed.

As shown in FIG. 4, when this operation is repeated again, the program data of the next line number "30" on the program list is displayed. This program data has branches. That is, when the IF condition is met, the process branches to line number "100", and when the condition is not met, the process branches to line number "40". In order to see the branch destination when the condition is satisfied, the user moves the cursor to line number ``100'' using the cursor keys as shown in Figure 4, and then moves the cursor to the forward direction trace as shown in Figure 4. Press ski FLT. As a result, the program data with line number "100" will be displayed.

Here, regarding the above input/response being obtained, for the input of the forward trace key FLT,
The operation of the CPU 9 will be explained with reference to the flowchart shown in FIG.

When you operate the forward trace key FLT, first, as shown in step S1, the current line number register 6 is
The contents of are stored in the buffer 4 indicated by the pointer 5. Next, proceed to step S2 and change the contents of the pointer to +
Do 1. Further, step S3 is executed to fetch the program data at the cursor position indicated by the cursor pointer 8.

In step S4, the imported program data is judged, and if the data is not a line number (for example, if the cursor is at a position like 2 or 3 in Figure 4 and the forward trace key FLT is pressed at this position) ), the program proceeds to step S5, reads out the next line of program data from the program memory section 1, displays it, and stores that line in the current line register 6.

On the other hand, if the captured data is a line number as shown in 4 in FIG. In the next step S7, it is determined whether or not a line number is found. If found, the program data of that line number is displayed in step S8, and the current line number is stored in the current line number register 6. Note that if the search result is that no item is found, error processing is performed.

Therefore, if you specify a line number with the cursor and press the forward trace key FLT at a point where there is a branch in the program, the program data for that line number will be displayed, and the program data specified somewhere other than the line number will be displayed. When you press the forward trace key FLT, it simply displays the next line of program data.

Returning to Figure 4, in Figure 4 6, the forward trace key was pressed at a cursor position other than the line number, so
The next line after line number "100", that is, the program data at line number "110" is displayed.

Next, as can be seen from Figure 4 6 and 7, when the program data of line number "110" is displayed and the backward trace key BLT is pressed while the cursor is positioned somewhere other than the line number, , the previous line on the program list as shown in FIG.
In this case, the program data with line number "100" is displayed.

Here, as shown in FIG. 4, when the cursor is moved to the line number position using the cursor keys and the backward trace key BLT is pressed, the program data of line number "30" where the branch was made is displayed.

The function of such a backward trace key BLT will be explained with reference to the flowchart of FIG. That is, for the backward trace key BLT, the CPU 9 first reads the data at the cursor position in step T1, and determines whether it is a line number in step T2. For example, as shown on the right in Figure 4, press the reverse trace key at a position that is not a line number.
If the read data is not a line number, as is the case when BLT is pressed, the process advances to step T5 and reads the next smaller line than the current line number indicated by the current line number register 6 from the program memory section 1, displays it, and displays it. Store the line in the current line number register 6.

On the other hand, if the read data is a line number, as in the case where the backward trace key BLT is input with the line number located at the cursor position, as shown in FIG. 4
The pointer 5 is read to see if it is empty, and in step T4 it is checked whether the pointer 5 is "0". If the pointer 5 is "0", the process at step T5 is performed; otherwise, at step T6, the line number is read from the buffer 4 indicated by the pointer 5, and at step T7, the pointer 5 is decremented by 1. Then, in step T8, the program data of the corresponding line, line number "30" in this case, is read out and displayed.

In this way, for a backward trace key BLT operation, if it is performed at a position other than a line number, the previous line on the program list is called, and the cursor is placed at the line number on the branch destination line. When the backward trace key BLT operation is performed while the line is placed in , the branch source line is called.

Regarding buffer processing regarding the forward trace key FLT, only lines related to branching (line numbers "30" and "100" in the above embodiment) may be set in the buffer 4. That is, only when the forward trace key FLT is input with a line number instruction, the current line "30" is put into the buffer, and the branch preceding number "100" obtained by the program search is put into the next buffer.

[Effects of the invention] As detailed above, in this invention, the address of the next program data to be read is selected according to the cursor position in the program data displayed when the trace key is operated, so the program The list can be displayed as a trace in the same flow as when the program is executed, making it easier to search for bugs.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of this invention, FIG. 2 is a flowchart showing processing for forward trace key input, FIG. 3 is a flowchart showing processing for backward trace key input, and FIG. FIG. 4 is a diagram showing examples of key operations and display response results for each key operation. 1...Program memory section, 3...Display section, 4
...Buffer, 5...Pointer, 7...Key input section, 9...CPU.

Claims (1)

[Scope of utility model registration request] program storage means for storing a program consisting of multiple lines; display means for displaying at least one line of program data stored in the program storage means; A cursor means for giving instructions, a trace key for updating the program data displayed on the display means, and when this trace key is operated, the program data corresponding to the cursor position of the cursor means is displayed as a line number. a determining means for determining whether or not there is a line number, and a retrieving means for retrieving program data of the corresponding line number from the program storage means and reading it on the display means when the determining means determines that the line number is a line number. and reading means for reading program data of the next line of the program data currently displayed by the display means from the program storage means to the display means when the judgment section judges that it is not a line number. Programmable small electronic calculator.