Книга: Advanced PIC Microcontroller Projects in C

Project PDL

Project PDL

The operation of this project is very similar to that of Project 2. Figure 6.17 shows the PDL of the project. At the beginning of the program the PORTC pins are configured as outputs, and bit 0 of PORTB (RB0) is configured as input. The program then executes in a loop continuously and checks the state of the push-button switch. When the switch is pressed, two pseudorandom numbers between 1 and 6 are generated, and the bit pattern to be sent to PORTC is found by the method just described. This bit pattern is then sent to PORTC to display both dice numbers at the same time. The display shows the dice numbers for 3 seconds, and then all the LEDs turn OFF to indicate that the system is waiting for the push-button to be pressed again to display the next set of numbers.

START
 Create DICE table
 Configure PORTC as outputs
 Configure RB0 as input
 DO FOREVER
  IF button pressed THEN
   Get a random number between 1 and 6
   Find low nibble bit pattern
   Get second random number between 1 and 6
   High high nibble bit pattern
   Calculate data to be sent to PORTC
   Wait 3 seconds
   Turn OFF all LEDs
  ENDIF
 ENDDO
END

Figure 6.17: PDL of the project

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