我正在尝试将此代码转换为能够生成随机数 1-56。我会理解，但是因为程序必须来回切换才能显示两个数字，所以我很困惑。
我知道在某些方面，我可以使用 rand() 来选择。
我最终会将此代码与 lcd 屏幕结合使用来显示数字以及双七段显示器，但现在，只是想弄清楚对 PIC16F684 进行编程以在 dua84l 七段显示器上生成随机数
下面是电路和代码。图中未包含，但代码中 RA3 和 RA4 具有清除显示或生成下一个数字的按钮。
提供的程序在按下按钮时显示 00-0xFF。重写程序可能更容易，但我就是不明白
#include <xc.h>
/*
*
*
* 6/30/2020
/******************************************/
/* ------------------------------------------- */
/* Software/Hardware Interface: */
/* ------------------------------------------- */
/* */
/* Select Right Digit using >> RA0 */
/* Select Left Digit using >> RA1 */
/* */
/* Segment a >> RA5 */
/* Segment b >> RC5 */
/* Segment c >> RC4 */
/* Segment d >> RC3 */
/* Segment e >> RC2 */
/* Segment f >> RC1 */
/* Segment g >> RC0 */
/* ------------------------------------------- */
void PORTA_init(void)
{
PORTA = 0; // All PORTA Pins are low
CMCON0 = 7; // Turn off Comparators
ANSEL = 0; // Turn off ADC
//TRISA = 0b001111; // RA4 and 5 are outputs; RA0,1,2, and 3 are input
return;
}
/******** END OF PORTA_init ****************************/
void delay_routine(void)
{
int i, j;
for (i = 0; i<2000; i++);
for (j = 0; j <2000;j++);
return;
}
/******** END OF delay_20ms *************************/
// CONFIG --- Configuration Word --- START
#pragma config FOSC = INTOSCIO
#pragma config WDTE = OFF
#pragma config PWRTE = OFF
#pragma config MCLRE = OFF
#pragma config CP = OFF
#pragma config CPD = OFF
#pragma config BOREN = OFF
#pragma config IESO = OFF
#pragma config FCMEN = OFF
// CONFIG --- Configuration Word --- END
int i, j;
int DisplayValue, DisplayLED;
const char LEDDigit[] = {
0b0000001, // "0"
0b1001111, // "1"
0b0010010, // "2"
0b0000110, // "3"
0b1001100, // "4"
0b0100100, // "5"
0b0100000, // "6"
0b0001111, // "7"
0b0000000, // "8"
0b0001100, // "9"
0b0001000, // "A"
0b0000000, // "b"
0b0110001, // "C"
0b0000001, // "d"
0b0110000, // "E"
0b0111000
}; // "F"
main()
{
PORTA = 0;
PORTC = 0;
CMCON0 = 7; // Turn off Comparators
ANSEL = 0; // Turn off ADC
TRISA = 0b011101; // RA5 and RA1 are outputs
TRISC = 0b000000;
DisplayValue = 0; // Start Displaying at 0x00
DisplayLED = 0; // Display the 1s first
while(1 == 1) // Loop Forever
{
if (0 == DisplayLED) // True, then display right digit
{
RA5 = LEDDigit[DisplayValue & 0x0F] >> 6;
// Clears display bits 4 - 7 of DisplayValue,
// then selects bit 7 of LEDDigit
PORTC = LEDDigit[DisplayValue & 0x0F] & 0x03F;
// clears display bits 4 - 7 of DisplayValue,
// then selects bits 0 - 6 of LEDDigit
}
else
{
RA5 = LEDDigit[(DisplayValue >> 4) & 0x0F] >> 6;
PORTC = LEDDigit[(DisplayValue >> 4) & 0x0F] & 0x03F;
} //
TRISA = TRISA ^ 0b000011; // Swap Left/Right (RA0 and RA1)
PORTA = PORTA & 0b111100; // Make Sure Bits are Low
DisplayLED = DisplayLED ^ 1; // Other Digit Next
NOP(); // Used for 10 ms Timing
for (i = 0; i < 30; i++);//10ms Delay Loop
NOP(); // Used for 10 ms Timing
if (RA3 == 0)
{
delay_routine();
DisplayValue++; // Increment the Counter
delay_routine();
} //
if (RA4 == 0)
{
delay_routine();
DisplayValue=0;
delay_routine();
}
}
}