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  1. #1
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    Shift register with PIC18F4520

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Name:	74hc164n.png 
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ID:	150783

    Code:
    
    #define	XTAL_FREQ	20MHZ
    #include 
    #include "delay.h"
    
    // CONFIG1H
    #pragma config OSC = HS         // Oscillator Selection bits (HS oscillator)
    #pragma config FCMEN = OFF      // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
    #pragma config IESO = OFF       // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)
    
    // CONFIG2L
    #pragma config PWRT = ON       // Power-up Timer Enable bit (PWRT disabled)
    #pragma config BOREN = OFF      // Brown-out Reset Enable bits (Brown-out Reset disabled in hardware and software)
    #pragma config BORV = 3         // Brown Out Reset Voltage bits (Minimum setting)
    
    // CONFIG2H
    #pragma config WDT = OFF        // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
    #pragma config WDTPS = 32768    // Watchdog Timer Postscale Select bits (1:32768)
    
    // CONFIG3H
    #pragma config CCP2MX = PORTC   // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
    #pragma config PBADEN = OFF     // PORTB A/D Enable bit (PORTB<4:0> pins are configured as digital I/O on Reset)
    #pragma config LPT1OSC = OFF    // Low-Power Timer1 Oscillator Enable bit (Timer1 configured for higher power operation)
    #pragma config MCLRE = ON       // MCLR Pin Enable bit (MCLR pin enabled; RE3 input pin disabled)
    
    // CONFIG4L
    #pragma config STVREN = OFF      // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
    #pragma config LVP = OFF        // Single-Supply ICSP Enable bit (Single-Supply ICSP disabled)
    #pragma config XINST = OFF      // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))
    
    // CONFIG5L
    #pragma config CP0 = OFF        // Code Protection bit (Block 0 (000800-001FFFh) not code-protected)
    #pragma config CP1 = OFF        // Code Protection bit (Block 1 (002000-003FFFh) not code-protected)
    #pragma config CP2 = OFF        // Code Protection bit (Block 2 (004000-005FFFh) not code-protected)
    #pragma config CP3 = OFF        // Code Protection bit (Block 3 (006000-007FFFh) not code-protected)
    
    // CONFIG5H
    #pragma config CPB = OFF        // Boot Block Code Protection bit (Boot block (000000-0007FFh) not code-protected)
    #pragma config CPD = OFF        // Data EEPROM Code Protection bit (Data EEPROM code-protected)
    
    // CONFIG6L
    #pragma config WRT0 = OFF       // Write Protection bit (Block 0 (000800-001FFFh) not write-protected)
    #pragma config WRT1 = OFF       // Write Protection bit (Block 1 (002000-003FFFh) not write-protected)
    #pragma config WRT2 = OFF       // Write Protection bit (Block 2 (004000-005FFFh) not write-protected)
    #pragma config WRT3 = OFF       // Write Protection bit (Block 3 (006000-007FFFh) not write-protected)
    
    // CONFIG6H
    #pragma config WRTC = OFF       // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected)
    #pragma config WRTB = OFF       // Boot Block Write Protection bit (Boot block (000000-0007FFh) not write-protected)
    #pragma config WRTD = OFF       // Data EEPROM Write Protection bit (Data EEPROM not write-protected)
    
    // CONFIG7L
    #pragma config EBTR0 = OFF      // Table Read Protection bit (Block 0 (000800-001FFFh) not protected from table reads executed in other blocks)
    #pragma config EBTR1 = OFF      // Table Read Protection bit (Block 1 (002000-003FFFh) not protected from table reads executed in other blocks)
    #pragma config EBTR2 = OFF      // Table Read Protection bit (Block 2 (004000-005FFFh) not protected from table reads executed in other blocks)
    #pragma config EBTR3 = OFF      // Table Read Protection bit (Block 3 (006000-007FFFh) not protected from table reads executed in other blocks)
    
    // CONFIG7H
    #pragma config EBTRB = OFF      // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) not protected from table reads executed in other blocks)
    
    #define data LATDbits.LATD1  /*Output control*/
    #define clock LATDbits.LATD0  /*Output control*/
    
    
    int check_1[] = {0, 0, 0, 0, 0, 0, 0, 1};
    int check_2[] = {0, 0, 0, 0, 0, 0, 1, 1};
    int check_3[] = {0, 0, 0, 0, 0, 1, 1, 1};
    
    void port_setting(void) {
    
        TRISA = 0b00000000;
        PORTA = 0b00000000;
    
        CMCON = 0X07;
    
        TRISB = 0b00000000;
        PORTB = 0b00000000;
    
        TRISC = 0b00000000;
        PORTC = 000000000;
    
        TRISD = 0b00000000;
        PORTD = 0b00000000;
    
        TRISE = 0X00;
        PORTE = 0X00;
    }
    
    void main(void) {
    
        port_setting();
    
        while (1) {
            for (int y = 0; y <= 8; y++) {
                clock = 1;
                data = check_1[y];
                DelayMs(100);
                clock = 0;
            }
            while (1) {
    
            }
        }
    }
    This is the circuit and code used to interface 74HC164N with PIC controller.
    I tried to switch ON every output pins in 74HC164N one by one.
    By using the above code,1,2,3 outputs are working in shift register.

    If I used like

    Code:
    int check_4[] = {0, 0, 0, 0, 1, 1, 1, 1};
    int check[] = {1, 1, 1, 1, 1, 1, 1, 1};
    to turn on 4th and 5th pin in shift register means not working.

    How to solve this issue.

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  2. #2
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    Re: Shift register with PIC18F4520

    1. remove R4 and R6 they serve no purpose, link the PIC directly to the '164.
    2. read the HC164 data sheet, the input is clocked on the low to high transition, you have it reversed so it will be one 'shift' delayed.

    If that doesn't fix it, wire an LED and 1K resistor in series and use it as a logic probe between ground and the data/clock lines. With such low clock speeds you should be able to see the clock and data pulses as flashes.

    Brian.
    PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
    It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.



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  3. #3
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    Re: Shift register with PIC18F4520

    This

    Code:
    for (int y = 0; y <= 8; y++) {
    should be

    Code:
    for (int y = 0; y < 8; y++) {
    for transferring 8 bits into shift register.



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  4. #4
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    Re: Shift register with PIC18F4520




  5. #5
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    Re: Shift register with PIC18F4520

    This code which I wrote works fine for me.

    Code:
    sbit B at RD1_bit;
    sbit CLK at RD5_bit;
    
    unsigned char counter = 0;
    
    void sendByte(unsigned char byte) {
         char mask = 0x80;
         char i = 0;
         
         for(i = 0; i < 8; i++) {
             CLK = 0;
             
             if(byte & mask)B = 1;
             else B = 0;
             
             Delay_us(50);
             CLK = 1;
             mask >>= 1;
         }
    }
    
    void main() {
        TRISD = 0x00;
        PORTD = 0x00;
        LATD = 0x00;
    
        while(1) {
            SendByte(counter++);
            Delay_ms(1000);
        }
    }



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