ShiftIn Register

[einzigartigername]

Hey Guys,

I am new in using a Raspberry Pi (3 Model B) and I am trying to use a ShiftIn Register.
I tryed the circuit with my Arduino Uno and it worked.
My code for the Arduino:

Code: Select all

int latchPin = 8;
int clockPin = 9;
int dataPin = 10;

void setup() {
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, INPUT);

  Serial.begin(9600);
}



void loop() {
  digitalWrite(latchPin, HIGH);
  delay(20);
  digitalWrite(latchPin, LOW);

  int buttons[] = {0, 0, 0, 0, 0, 0, 0, 0, 0};
  

  for(int i = 0; i < 8; i++){
    digitalWrite(clockPin, LOW);
    delay(20);
    buttons[i] = digitalRead(dataPin);
    digitalWrite(clockPin, HIGH);
  }

  for(int j = 0; j < 8; j++){
    Serial.print(buttons[j]);
  }
  Serial.println("------------------------------------");
}

For the Pi I am using the BCM2835 Lib (http://www.airspayce.com/mikem/bcm2835/index.html)
and transformed the code from above into a (theoretically) working code for the Pi, but it won't work like it should.
Here the code for the PI:

Code: Select all

#include <bcm2835.h>
#include <stdio.h>

#define DATA_PIN RPI_BPLUS_GPIO_J8_37 //Pin 37 - BLACK WIRE
#define CLOCK_PIN RPI_BPLUS_GPIO_J8_38  //Pin 38 - ORANGE WIRE
#define LATCH_PIN RPI_BPLUS_GPIO_J8_40 //Pin 40 - YELLOW WIRE

int main(int argc, char **argv)
{
    // Init
    if (!bcm2835_init())
      return 1;

    bcm2835_gpio_fsel(CLOCK_PIN, BCM2835_GPIO_FSEL_OUTP);
    bcm2835_gpio_fsel(LATCH_PIN, BCM2835_GPIO_FSEL_OUTP);

    bcm2835_gpio_fsel(DATA_PIN, BCM2835_GPIO_FSEL_INPT);
    bcm2835_gpio_set_pud(DATA_PIN, BCM2835_GPIO_PUD_DOWN);

    bcm2835_gpio_write(LATCH_PIN, HIGH);
    bcm2835_delay(20);
    bcm2835_gpio_write(LATCH_PIN, LOW);

    uint8_t buttons[8] = {0, 0, 0, 0, 0, 0, 0, 0};

    uint8_t i;
    for (i = 0; i < 8; i++){
        bcm2835_gpio_write(CLOCK_PIN, LOW);                 // Clock Low
        bcm2835_delay(20);                                  // Delay
        buttons[i] = bcm2835_gpio_lev(DATA_PIN);            // Read and save
        bcm2835_gpio_write(CLOCK_PIN, HIGH);                // Clock High
    }

    uint8_t v;
    for(v = 0; v < 8; v++){
        printf("%d", buttons[v]);
    }

    bcm2835_close();
    return 0;
}

Any ideas why it won't work?
Thanks for your help.

Einzigartigername