I have 2 circuits, both made up of a dual seven segment display and A pic16f684 (As shown below) the first circuit uses the code supplied to generate a random number 1-26. The letter portion is the same circuit, but with one of the transistor removed, to disable one side.
/*
* File: main.c
* Original Code Creator: dan1138
* Target: PIC16F684
* Compiler: XC8 v2.20
* IDE: MPLABX v5.25
*
* Description:
*
* Created on July 21, 2020, 3:45 PM
*
* PIC16F684
* +------------:_:------------+
* GND -> 1 : VDD VSS : 14 <- 5v0
* SEG_a_DRIVE <> 2 : RA5/T1CKI PGD/AN0/RA0 : 13 <> DIGIT_DRIVE_2
* SW2 <> 3 : RA4/AN3 PGC/AN1/RA1 : 12 <> DIGIT_DRIVE_1
* SW1 -> 4 : RA3/VPP AN2/RA2 : 11 <>
* SEG_b_DRIVE <> 5 : RC5/CPP1 AN4/RC0 : 10 <> SEG_g_DRIVE
* SEG_c_DRIVE <> 6 : RC4/C2OUT AN5/RC1 : 9 <> SEG_f_DRIVE
* SEG_d_DRIVE <> 7 : RC3/AN7 AN6 RC2 : 8 <> SEG_e_DRIVE
* +---------------------------:
* DIP-14
*/
// 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
#include <xc.h>
#include <stdlib.h>
/* Oscillator frequency we will select with the OSCCON register */
#define _XTAL_FREQ (4000000ul)
/*
* Segment locations
* of an LED display
* ---a---
* : :
* f b
* : :
* ---g---
* : :
* e c
* : :
* ---d---
*/
const unsigned char LEDDigit[] = {
// abcdefg, Segment on = 0
0b00000001, // "0"
0b01001111, // "1"
0b00010010, // "2"
0b00000110, // "3"
0b01001100, // "4"
0b00100100, // "5"
0b00100000, // "6"
0b00001111, // "7"
0b00000000, // "8"
0b00001100, // "9"
0b00001000, // "A"
0b01100000, // "b"
0b00110001, // "C"
0b01000010, // "d"
0b00110000, // "E"
0b00111000 // "F"
};
void main(void)
{
unsigned char DisplayValue, DisplayLED, DigitSegments;
unsigned char LoopCount;
unsigned int Temp;
PORTA = 0;
PORTC = 0;
CMCON0 = 7; // Turn off Comparators
ANSEL = 0; // Turn off ADC
__delay_ms(500); // wait for ICD before making PGC and PGD outputs;
TRISA = 0b011100; // RA5, RA1, RA0 are outputs
TRISC = 0b000000;
OPTION_REGbits.nRAPU = 0; // Enable weak pull-up on PORTA
WPUA = 0; // Turn off all pull-ups
WPUAbits.WPUA4 = 1; // Turn on RA4 pull-up
DisplayValue = 0; // Start Displaying at 0x00
DisplayLED = 0; // Display the 1s first
LoopCount = 0;
srand(0x1234);
for(;;)
{
PORTC = 0xFF; // turn off all segment drivers
PORTA = 0xFF; // and digit drivers
if (1 == (DisplayLED & 1))
{
DigitSegments = LEDDigit[(DisplayValue >> 4) & 0x0F];
if(DigitSegments & 0b1000000)
{
PORTA = 0b111110; // turn on Digit driver 2
}
else
{
PORTA = 0b011110; // turn on Digit driver 2 and SEG_a_DRIVER
}
}
else
{
DigitSegments = LEDDigit[DisplayValue & 0x0F];
if(DigitSegments & 0b1000000)
{
PORTA = 0b111101; // turn on Digit driver 1
}
else
{
PORTA = 0b011101; // turn on Digit driver 1 and SEG_a_DRIVER
}
}
PORTC = DigitSegments; // turn on segment drivers b to g
DisplayLED++; // select next digit
__delay_ms(10); // Show digit for 10 milliseconds
if(0 == PORTAbits.RA3) // is SW1 pressed?
{
LoopCount++;
if(LoopCount == 1)
{
// Display a new random value every 500 milliseconds
Temp = rand() & 0xFFu; // put random value in range of 0 to 255 and treat is as a fraction in range (0/256) <= value < (255/256)
Temp = (Temp * 26u + 0x100u) >> 8; // Use tricky math to make a random number in the range from 1 to 56
DisplayValue = (Temp / 10u) << 4; // Extract the ten's digit
DisplayValue = DisplayValue | (Temp % 10); // Extract the one's digit
}
if(LoopCount >= 50)
{
LoopCount = 0;
}
}
else
{
LoopCount = 0;
}
if(0 == PORTAbits.RA4) // is SW2 pressed?
{
DisplayValue = 0; // Reset display value to zero
LoopCount = 0;
}
}
}
My goal to is generate the corresponding letter on the second seven segment display using a modified alphabet. however, I cant figure out how to do this. My original thought was to output the temp value to the second pic16f684 with modified LEDDigits[];
const unsigned char LEDDigit[] = {
// abcdefg, Segment on = 0
0b01111110, //"-"
0b00001000, // "A"
0b01100000, // "b"
0b00110001, // "C"
0b01000010, // "d"
0b00110000, // "E"
0b00111000, // "F"
0b00100001, // "G"
0b01001000, // "H"
0b01111001, // "I"
0b01000011, // "J"
0b00101000, // "Modified K"
0b01110001, // "L"
0b00010101, // "Modified M"
0b01101010, // "n"
0b01100010, // "o"
0b00011000, // "P"
0b00001100, // "q"
0b01111010, // "r"
0b00100100, // "S"
0b01110000, // "t"
0b01100011, // "u"
0b01010101, // "Modified V"
0b01000000, // "Modified W"
0b00110110, // "Modified X"
0b01000100, // "y"
0b00010010 // "Z"
};
But I dont believe I can just output that number. How can I display the number (1-26) on one dual display, and the corresponding letter on another display.
Could I potentially add the second seven segment display into the number circuit, set its transistor on RA2, and have it display the letter at the same time? how would this work?
