7-segement display fill direction

Projects General Guidance
1

I'm using LED Control library for use with DCS BIOS for a flight simulator I'm building. I have gotten the display to work and properly display the desired data, however its filling from the opposite direction than what I want. For example '7---' '50--'. I would like for it start from the right and fill left as the digits increase. Ie. '---7' '--50'

Here is my code currently:


// Include DcsBios and LedControl libraries for 7-segment panel with Max7219 chip
#define DCSBIOS_IRQ_SERIAL

#include <LedControl.h>
#include <DcsBios.h>

/* Create function to configure a 7-segment panel. Pins DIN(12) CLK(11) CS(10) (1)panel */
LedControl lc = LedControl(12, 11, 10);

// IFEI Fuel Flow 7-Seg output
void onIfeiFfRChange(char* newValue) {
  /* your code here */

  lc.setChar(0, 3, 'F', false);
  lc.setChar(0, 0, newValue[2], false);
  lc.setChar(0, 1, newValue[1], false);
  lc.setChar(0, 2, newValue[0], false);
}
DcsBios::StringBuffer<3> ifeiFfRBuffer(0x7480, onIfeiFfRChange);

void onIfeiFfLChange(char* newValue) {
  /* your code here */
  lc.setChar(0, 5, newValue[2], false);
  lc.setChar(0, 6, newValue[1], false);
  lc.setChar(0, 7, newValue[0], false);
  lc.setChar(0, 4, 'F', false);
}
DcsBios::StringBuffer<3> ifeiFfLBuffer(0x747c, onIfeiFfLChange);

void setup() {
  // put your setup code here, to run once:
  DcsBios::setup();


  // MAX7219 INITIALISATION
  lc.shutdown(0, false);  //turn on the display
  lc.setIntensity(0, 8);  //set the brightness
  lc.clearDisplay(0);     //clear the display

  // custom boot code before connection
  lc.setChar(0, 7, '-', false);
  lc.setChar(0, 6, '-', false);
  lc.setChar(0, 5, '-', false);
  lc.setChar(0, 4, 'F', false);
  lc.setChar(0, 3, 'F', false);
  lc.setChar(0, 2, '-', false);
  lc.setChar(0, 1, '-', false);
  lc.setChar(0, 0, '-', false);
}

void loop() {
  // put your main code here, to run repeatedly:
  DcsBios::loop();
}
2

Please read the forum guide in the sticky post at the top of any forum section. Your post above is breaking forum rules by not using code tags.

EDIT: thanks for fixing the code tags!

3

No problem, thanks for the tip

4

Try this and describe what happens

// Include DcsBios and LedControl libraries for 7-segment panel with Max7219 chip
#define DCSBIOS_IRQ_SERIAL

#include <LedControl.h>
#include <DcsBios.h>

/* Create function to configure a 7-segment panel. Pins DIN(12) CLK(11) CS(10) (1)panel */
LedControl lc = LedControl(12, 11, 10);

void reformat(char* newValue) {
  while(newValue[2] == ' ') {
    newValue[2] = newValue[1];
    newValue[1] = newValue[0];
    newValue[0] = ' ';
  }
}


// IFEI Fuel Flow 7-Seg output
void onIfeiFfRChange(char* newValue) {
  /* your code here */
  reformat(newValue);
  lc.setChar(0, 3, 'F', false);
  lc.setChar(0, 0, newValue[2], false);
  lc.setChar(0, 1, newValue[1], false);
  lc.setChar(0, 2, newValue[0], false);
}
DcsBios::StringBuffer<3> ifeiFfRBuffer(0x7480, onIfeiFfRChange);

void onIfeiFfLChange(char* newValue) {
  /* your code here */
  reformat(newValue);
  lc.setChar(0, 5, newValue[2], false);
  lc.setChar(0, 6, newValue[1], false);
  lc.setChar(0, 7, newValue[0], false);
  lc.setChar(0, 4, 'F', false);
}
DcsBios::StringBuffer<3> ifeiFfLBuffer(0x747c, onIfeiFfLChange);

void setup() {
  // put your setup code here, to run once:
  DcsBios::setup();


  // MAX7219 INITIALISATION
  lc.shutdown(0, false);  //turn on the display
  lc.setIntensity(0, 8);  //set the brightness
  lc.clearDisplay(0);     //clear the display

  // custom boot code before connection
  lc.setChar(0, 7, '-', false);
  lc.setChar(0, 6, '-', false);
  lc.setChar(0, 5, '-', false);
  lc.setChar(0, 4, 'F', false);
  lc.setChar(0, 3, 'F', false);
  lc.setChar(0, 2, '-', false);
  lc.setChar(0, 1, '-', false);
  lc.setChar(0, 0, '-', false);
}

void loop() {
  // put your main code here, to run repeatedly:
  DcsBios::loop();
}
5

That did it! Thank you for your help

6

Enjoy your fish!