Passing info to function

Projects Programming
1

I use two separate displays with shiftregisters. One is sr_A, second is sr_B.
I have two separate void function; showNumber_A and showNumber_B.
I pass variable to each function. I like to have only one function, but I do not know how to pass which shift register to use.
Can you help me. Please forgive me if I use wrong programming words.

ShiftRegister74HC595<2> sr_A(SDIa, SCLKa, LOADa);
ShiftRegister74HC595<2> sr_B(SDIa, SCLKa, LOADa);

void showNumber_A(int num)
{
    digit2 = num % 10;
    digit1 = (num / 10) % 10;
    //Send them to 7 segment displays
    uint8_t numberToPrint[] = { digits[digit1],digits[digit2] };
    sr_A.setAll(numberToPrint);
}

void showNumber_B(int num)
{
    digit2 = num % 10;
    digit1 = (num / 10) % 10;
    //Send them to 7 segment displays
    uint8_t numberToPrint[] = { digits[digit1],digits[digit2] };
    sr_B.setAll(numberToPrint);
}
`
2

Please post all your code. It would be useful to understand what libraries you are using.

3 
sr_A.setAll(numberToPrint);

What is sr_A (and sr_B) ?

Can you see why we ask that you post a complete sketch ?

4

Use a reference to shift register

void showNumber(int num, ShiftRegister74HC595<2> &sr)
{
    digit2 = num % 10;
    digit1 = (num / 10) % 10;
    //Send them to 7 segment displays
    uint8_t numberToPrint[] = { digits[digit1],digits[digit2] };
    sr.setAll(numberToPrint);
}

Usage:

showNumber(8, sr_A);
5

Beat me to it:

using SR2 = ShiftRegister74HC595<2>;

SR2 sr_A(SDIa, SCLKa, LOADa);
SR2 sr_B(SDIa, SCLKa, LOADa);

void showNumber_A(SR2 &sr, int num) {
  digit2 = num % 10;
  digit1 = (num / 10) % 10;
  //Send them to 7 segment displays
  uint8_t numberToPrint[] = { digits[digit1], digits[digit2] };
  sr.setAll(numberToPrint);
}
1 Like
6

You use the same pins for both SR - is it correct?

7

Thx a lot - it is exactly what I was looking for. Works perfectly.

8

Please mark the problem solved

9

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