Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Register Log in
  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

(Solved)Again problem with matrix, this time 8x32

Dr_Doggy said:
I am worried though that you cant see scrolling, what about the binary values in the corner, they should be changing with time?
Click to expand...
yes, they do blink & change thankfully. I played bit and managed to make scrolling counter with millis(), so RTC should be indeed possible!
 
I MADE IT! Scrolling DD/MM/YY HH:MM:SS
I'll upload code & video in a few! :)
 
and code(needs bit refining, seconds won't update while scrolling, I know it should be possible as I made 9999 seconds counter that scrolled and updated as scrolling) And for some reason couldn't place all stuff in one loop(), now date & time are separate, but it works. And thanks a LOW for you guys for help!!! :)
C: 
#include "FontMap.h"
#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 RTC;
int dataPin = 2; // ic: 14, ser_in Define which pins will be used for the Shift Register control
int latchPin = 3; // ic:12 silkscreen numbers!
int clockPin = 4;


unsigned char displayPointer = 0; // for interrupt use...
unsigned char buffer1[32]; // buffer for screen
unsigned char backbuffer[32]; // Spare screen for drawing on
unsigned char power[8] = {128, 64, 32, 16, 8, 4, 2, 1};

ISR(TIMER1_COMPA_vect) // timer compare interrupt service routine, called every now and then, outside of loop
{
  if (TIFR2) // Make sure its the timer interrupt.
  {
  setcolumn(displayPointer);  //column scanning
  setdata(buffer1[displayPointer]);
  PORTD = (1 << PORTD3);
  PORTD = (0 << PORTD3);

  //digitalWrite(latchPin ,HIGH);
  //digitalWrite(latchPin , LOW ); // STORECLOCK

  if (++displayPointer == 32)
  { displayPointer = 0;
  } // 32 LED row sections in total
  }
  TIFR2 = 0; // Clear timer 2 interrupt flag
}

void setcolumn(unsigned char col)  //loop that takes care of column scanning
{
  signed char pos;
  for (pos = 32; pos > -1; pos--)
  {
  if (col == pos)
  {
  PORTD = (1 << PORTD2);
  //digitalWrite(dataPin ,HIGH);
  }
  else
  {
  PORTD = (0 << PORTD2);
  //digitalWrite(dataPin ,LOW);
  } // PIN1 DATA pin
  //PORTD=(1<<PORTD4);
  //PORTD=(0<<PORTD4);

  digitalWrite(clockPin , HIGH);
  digitalWrite(clockPin , LOW);
  }
}



void setdata(unsigned char dat) {
  unsigned char pos;
  for (pos = 0; pos < 8; pos++)
  {
  if (dat & 128)
  {
  dat -= 128;
  PORTD = (1 << PORTD2);
  //digitalWrite(dataPin ,HIGH);
  }
  else
  {
  PORTD = (0 << PORTD2);
  }
  //digitalWrite(dataPin ,LOW);} // PIN1 DATA pin
  dat = dat * 2;
  digitalWrite(clockPin , HIGH);
  digitalWrite(clockPin , LOW);
  }
}
void clr() //clear
{
  int addr;
  for (addr = 0; addr < 32; addr++) // Empty display buffer
  backbuffer[addr] = 0;
}

void Blit() //transfers data between display buffer to screen buffer
{
  int addr = 0;
  noInterrupts(); // disable all interrupts during setup
  for (addr = 0; addr < 32; addr ++)
  {
  buffer1[addr] = backbuffer[addr]; // put all data from display buffer
  } // to screen buffer
  interrupts(); // enable all interrupts
}

void pixel(signed char x, signed char y, int cond)
{
  unsigned char pix, msk;
  if (x < 0 || y < 0) return; // outside drawing limits negative
  if (x > 31 || y > 7) return; // outside drawing limits positive
  pix = power[y];
  msk = backbuffer[x]; // get exsisting data


  if (cond == 2)
  pix ^= msk; // XOR data to screen
  if (cond == 1)
  {
  pix = ~pix;
  pix &= msk; // AND data to screen
  }
  if (cond == 0)
  pix |= msk; // OR data to screen
  backbuffer[x] = pix; // apply changes
}

void charput(unsigned char ch, signed char x, signed char y)
{
  signed char x1, y1;
  unsigned char disp;
  unsigned char disp2;
  for ( x1 = 0; x1 < 8; x1++) // eight rows
  {
  disp = font[x1 + (ch * 8)];
  for (y1 = 0; y1 < 8; y1++) // eight pixels
  {
  disp2 = disp & power[y1];
  if (disp2 > 0)
  {
  pixel(x + x1, y + y1, 0); // OR the pixel to the display buffer
  }
  }

  }
}

void strput(const char* ch, signed char x, signed char y)
{
  int addr;
  while (*ch )
  {
  charput(*ch++, x, y); // write a string to the display buffer
  x += 7;
  }
}



void setup() //setup runs once
{
  Wire.begin();
  RTC.begin();
  signed char cntr;
  noInterrupts(); // disable all interrupts during setup
  DDRD = DDRD | B11111100; //port registers used to set pin directions
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1 = 0;
  OCR1A = 31; // compare match register 16MHz/256/2Hz -----------------------------------> delay time (lcd flicker/brightness)
  TCCR1B |= (1 << WGM12); // CTC mode, free-running, clear on match
  TCCR1B |= (0 << CS10); // 256 prescaler
  TCCR1B |= (0 << CS11); // 256 prescaler
  TCCR1B |= (1 << CS12); // 256 prescaler
  TIMSK1 |= (1 << OCIE1A); // enable timer compare interrupt
  interrupts(); // enable all interrupts

} // End main

void loop() //just sitting here
{
  DateTime now = RTC.now();
  signed char scrollctr;

  for (scrollctr = 112; scrollctr > -8; scrollctr--)
  {
  clr();
  charput(((now.day() / 10) % 10), scrollctr - 80, 0);
  charput(((now.day() / 1) % 10), scrollctr - 72, 0);
  strput("/", scrollctr - 64, 0);
  charput(((now.month() / 10) % 10), scrollctr - 56, 0);
  charput(((now.month() / 1) % 10), scrollctr - 48, 0);
  strput("/", scrollctr - 40, 0);
  charput(((now.year() / 1000) % 10), scrollctr - 32, 0);
  charput(((now.year() / 100) % 10), scrollctr - 24, 0);
  charput(((now.year() / 10) % 10), scrollctr - 16, 0);
  charput(((now.year() / 1) % 10), scrollctr - 8, 0);
  Blit();
  delay(100);
  }

  for (scrollctr = 96; scrollctr > -8; scrollctr--)
{ 
  clr();
  charput(((now.hour() / 10) % 10), scrollctr - 64, 0);
  charput(((now.hour() / 1) % 10), scrollctr - 56, 0);
  strput(":", scrollctr - 48, 0);
  charput(((now.minute() / 10) % 10), scrollctr - 40, 0);
  charput(((now.minute() / 1) % 10), scrollctr - 32, 0);
  strput(":", scrollctr - 24, 0);
  charput(((now.second() / 10) % 10), scrollctr - 16, 0);
  charput(((now.second() / 1) % 10), scrollctr - 8, 0);
  Blit();
  delay(100);
}
}
and fontmap:
C: 
static unsigned char font [1000] =  //numbers stored here
{ //Position, Character
  0x00, 0x00, 0x7E, 0x81, 0x81, 0x81, 0x7E, 0x00, // 0  0
  0x00, 0x00, 0x80, 0x82, 0xFF, 0x80, 0x80, 0x00, // 1  1
  0x00, 0x00, 0xC2, 0xA1, 0x91, 0x89, 0x86, 0x00, // 2  2
  0x00, 0x00, 0x42, 0x91, 0x91, 0x91, 0x6E, 0x00, // 3  3
  0x00, 0x00, 0x18, 0x14, 0x12, 0xFF, 0x10, 0x00, // 4  4
  0x00, 0x00, 0x4F, 0x91, 0x91, 0x91, 0x61, 0x00, // 5  5
  0x00, 0x00, 0x6E, 0x91, 0x91, 0x91, 0x62, 0x00, // 6  6
  0x00, 0x00, 0x01, 0xF1, 0x09, 0x05, 0x03, 0x00, // 7  7
  0x00, 0x00, 0x6E, 0x91, 0x91, 0x91, 0x6E, 0x00, // 8  8
  0x00, 0x00, 0x8E, 0x91, 0x91, 0x91, 0x6E, 0x00, // 9  9

  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 10
  0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, // 11
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 12
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 13
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 14
  0x00, 0xe4, 0xa2, 0xa2, 0xa2, 0x9c, 0x00, 0x00, // 15
  0x00, 0x3c, 0x52, 0x92, 0x92, 0x0c, 0x00, 0x00, // 16
  0x00, 0x80, 0x8e, 0x90, 0xa0, 0xc0, 0x00, 0x00, // 17
  0x00, 0x6c, 0x92, 0x92, 0x92, 0x6c, 0x00, 0x00, // 18
  0x00, 0x60, 0x92, 0x92, 0x94, 0x78, 0x00, 0x00, // 19
  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 20
  0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, // 21
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 22
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 23
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 24
  0x00, 0xe4, 0xa2, 0xa2, 0xa2, 0x9c, 0x00, 0x00, // 25
  0x00, 0x3c, 0x52, 0x92, 0x92, 0x0c, 0x00, 0x00, // 26
  0x00, 0x80, 0x8e, 0x90, 0xa0, 0xc0, 0x00, 0x00, // 27
  0x00, 0x6c, 0x92, 0x92, 0x92, 0x6c, 0x00, 0x00, // 28
  0x00, 0x60, 0x92, 0x92, 0x94, 0x78, 0x00, 0x00, // 29
  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 30
  0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, // 31


  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 32  "space"
  0x00, 0x00, 0x00, 0xFB, 0xFB, 0x00, 0x00, 0x00, // 33  !
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 34
  0x00, 0xe4, 0xa2, 0xa2, 0xa2, 0x9c, 0x00, 0x00, // 35
  0x00, 0x3c, 0x52, 0x92, 0x92, 0x0c, 0x00, 0x00, // 36
  0x00, 0x80, 0x8e, 0x90, 0xa0, 0xc0, 0x00, 0x00, // 37
  0x00, 0x6c, 0x92, 0x92, 0x92, 0x6c, 0x00, 0x00, // 38
  0x00, 0x60, 0x92, 0x92, 0x94, 0x78, 0x00, 0x00, // 39


  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 40
  0x00, 0x81, 0x21, 0xC1, 0xFF, 0x01, 0x01, 0x00, // 41
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 42  
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 43
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 44
  0x00, 0xe4, 0xa2, 0xa2, 0xa2, 0x9c, 0x00, 0x00, // 45
  0x00, 0x3c, 0x52, 0x92, 0x92, 0x0c, 0x00, 0x00, // 46
  0x00, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x00, // 47  /

  0x00, 0x00, 0x7E, 0x81, 0x81, 0x81, 0x7E, 0x00, // 0  0
  0x00, 0x00, 0x80, 0x82, 0xFF, 0x80, 0x80, 0x00, // 1  1
  0x00, 0x00, 0xC2, 0xA1, 0x91, 0x89, 0x86, 0x00, // 2  2
  0x00, 0x00, 0x42, 0x91, 0x91, 0x91, 0x6E, 0x00, // 3  3
  0x00, 0x00, 0x18, 0x14, 0x12, 0xFF, 0x10, 0x00, // 4  4
  0x00, 0x00, 0x4F, 0x91, 0x91, 0x91, 0x61, 0x00, // 5  5
  0x00, 0x00, 0x6E, 0x91, 0x91, 0x91, 0x62, 0x00, // 6  6
  0x00, 0x00, 0x01, 0xF1, 0x09, 0x05, 0x03, 0x00, // 7  7
  0x00, 0x00, 0x6E, 0x91, 0x91, 0x91, 0x6E, 0x00, // 8  8
  0x00, 0x00, 0x8E, 0x91, 0x91, 0x91, 0x6E, 0x00, // 9  9

  0x00, 0x00, 0x00, 0x00, 0x6C, 0x00, 0x00, 0x00, // 58  :
  0x00, 0x60, 0x92, 0x92, 0x94, 0x78, 0x00, 0x00, // 59
  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 60
  0x00, 0x81, 0x21, 0xC1, 0xFF, 0x01, 0x01, 0x00, // 61
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 62
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 63
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 64
  0x00, 0x00, 0X7C, 0X0A, 0X0A, 0X0A, 0X7C, 0x00, // 65  A
  //0x94,0x5c,0xb6,0x5f,0x5f,0xb6,0x5c,0x94,
  0x00, 0x00, 0x7E, 0x4A, 0x4A, 0x4A, 0x34, 0x00, // 66  B
  0x00, 0x00, 0x3C, 0x42, 0x42, 0x42, 0x24, 0x00, // 67  C
  0x00, 0x00, 0x7E, 0x42, 0x42, 0x42, 0x3C, 0x00, // 68  D
  0x00, 0x00, 0x7E, 0x4A, 0x4A, 0x4A, 0x4A, 0x00, // 69  E

  0x00, 0x00, 0xFF, 0x11, 0x11, 0x11, 0x01, 0x00, // 70  F
  0x00, 0x00, 0x3C, 0x42, 0x52, 0x52, 0x34, 0x00, // 71  G
  0x00, 0x00, 0x7e, 0x10, 0x10, 0x10, 0x7e, 0x00, // 72  H
  0x00, 0x00, 0x00, 0x42, 0x7e, 0x42, 0x00, 0x00, // 73  I
  0x00, 0x00, 0x20, 0x40, 0x40, 0x3A, 0x00, 0x00, // 74  J
  0x00, 0x00, 0x7E, 0x18, 0x24, 0x42, 0x00, 0x00, // 75  K
  0x00, 0x00, 0x7E, 0x40, 0x40, 0x40, 0x40, 0x00, // 76  L
  0x00, 0x00, 0x7E, 0x04, 0x08, 0x04, 0x7E, 0x00, // 77  M
  0x00, 0x00, 0x7E, 0x04, 0x18, 0x20, 0x7E, 0x00, // 78  N
  0x00, 0x00, 0x7E, 0x81, 0x81, 0x81, 0x7E, 0x00, // 79  O

  0x00, 0x00, 0x7E, 0x0A, 0x0A, 0x0A, 0x04, 0x00, // 80  P
  0x00, 0x00, 0x3C, 0x42, 0x52, 0x62, 0x3C, 0x00, // 81  Q
  0x00, 0x00, 0x7C, 0x0A, 0x1A, 0x2A, 0x44, 0x00, // 82  R
  0x00, 0x00, 0x24, 0x4A, 0x5A, 0x52, 0x24, 0x00, // 83  S
  0x00, 0x00, 0x02, 0x02, 0x7E, 0x02, 0x02, 0x00, // 84  T
  0x00, 0x00, 0x3E, 0x40, 0x40, 0x40, 0x3E, 0x00, // 85  U
  0x00, 0x00, 0x1E, 0x20, 0x40, 0x20, 0x1E, 0x00, // 86  V
  0x00, 0x00, 0x7F, 0x80, 0x7F, 0x80, 0x7F, 0x00, // 87  W
  0x00, 0x00, 0x42, 0x24, 0x18, 0x24, 0x42, 0x00, // 88  X
  0x00, 0x00, 0x02, 0x04, 0x78, 0x04, 0x02, 0x00, // 89  Y

  0x00, 0x42, 0x62, 0x52, 0x4A, 0x46, 0x42, 0X00, // 90  Z
  0x00, 0x81, 0x21, 0xC1, 0xFF, 0x01, 0x01, 0x00, // 91
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 92
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 93
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 94
  0x00, 0xe4, 0xa2, 0xa2, 0xa2, 0x9c, 0x00, 0x00, // 95
  0x00, 0x3c, 0x52, 0x92, 0x92, 0x0c, 0x00, 0x00, // 96
  0x00, 0x80, 0x8e, 0x90, 0xa0, 0xc0, 0x00, 0x00, // 97
  0x00, 0x6c, 0x92, 0x92, 0x92, 0x6c, 0x00, 0x00, // 98
  0x00, 0x60, 0x92, 0x92, 0x94, 0x78, 0x00, 0x00, // 99

  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 100
  0x00, 0x81, 0x21, 0xC1, 0xFF, 0x01, 0x01, 0x00, // 101
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 102
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 103
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 104
  0x00, 0x00, 0x00, 0x91, 0xBF, 0x01, 0x00, 0x00, // 105
  0x00, 0x3c, 0x52, 0x92, 0x92, 0x0c, 0x00, 0x00, // 106
  0x00, 0x80, 0x8e, 0x90, 0xa0, 0xc0, 0x00, 0x00, // 107
  0x00, 0x6c, 0x92, 0x92, 0x92, 0x6c, 0x00, 0x00, // 108
  0x00, 0x60, 0x92, 0x92, 0x94, 0x78, 0x00, 0x00, // 109


  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 110
  0x00, 0x81, 0x21, 0xC1, 0xFF, 0x01, 0x01, 0x00, // 111
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 112
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 113
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00, // 114
  0x00, 0xe4, 0xa2, 0xa2, 0xa2, 0x9c, 0x00, 0x00, // 115
  0x00, 0x3c, 0x52, 0x92, 0x92, 0x0c, 0x00, 0x00, // 116
  0x00, 0x80, 0x8e, 0x90, 0xa0, 0xc0, 0x00, 0x00, // 117
  0x00, 0x6c, 0x92, 0x92, 0x92, 0x6c, 0x00, 0x00, // 118
  0x00, 0x60, 0x92, 0x92, 0x94, 0x78, 0x00, 0x00, // 119

  0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, // 120
  0x00, 0x81, 0x21, 0xC1, 0xFF, 0x01, 0x01, 0x00, // 121
  0x81, 0x42, 0x00, 0x18, 0x18, 0x00, 0x42, 0x01, // 122
  0x00, 0x84, 0x82, 0xa2, 0xd2, 0x8c, 0x00, 0x00, // 123
  0x00, 0x18, 0x28, 0x48, 0xfe, 0x08, 0x00, 0x00  // 124
};
 
Last edited:
Ian Rogers said:
Move this line into both for loops

DateTime now = RTC.now();
Click to expand...
Hehe, thanks Ian, that did the trick, now seconds update while scrolling :)...
 
and thank YOU guys for your patience in allowing me to attempt at this, .... like I said , piece of cake! and only 200 post later! ohya, an ima steal that woof blit for myown youtube!
 
question: I'm trying to adapt this to 7 segment, is there any other changes needed that new fontmap and change buffer sizes as well as colum sizes?
 
yes, the 7 segment only needs 7 bits per letter, easier to round off to a byte, so each buffer would only be 1byte long, instead of 8 previously used, as for the rows, stick to ascii! If you are just doing numbers ascii doesnt matter so much since there wont be any strings getting passed through.

that also means the array will be smaller,in this line:
static unsigned char font [1000]
1000 is the number of elements we reserved in the array , so /8, we now only need 125 elements to fill the ascii map, and only 10 if you only plan to use 0-9
 
Last edited:
Thanks doggy, thought so. That code just makes life SO much easier because it can show pretty much any data and so It's perfect for my car computer project, but I'll probadly need to make 14 segment version too to show menu system better (alphanumeric characters). I'll try it first myself, font map I got already rewritten for 7 segment, even array size.
 
this I've gotten thus far, no sensible yet and can't find reason why:
C: 
#include "FontMap7Segment.h"

int dataPin = 2; // ic: 14, ser_in Define which pins will be used for the Shift Register control
int latchPin = 3; // ic:12 silkscreen numbers!
int clockPin = 4;


unsigned char displayPointer = 0; // for interrupt use...
unsigned char buffer1[4]; // buffer for screen, was 32 for matrix (4x8=32 and each character is built from 8x8 block, due 8x8 matrix) but for 7 segments, each character is 1x8 and screen is 4 digits so buffers are 4 
unsigned char backbuffer[4]; // Spare screen for drawing on
unsigned char power[4] = {1, 2, 4, 8}; //B00000001,B00000010,B00000100,B00001000 for digits
// was: unsigned char power[8] = {128, 64, 32, 16, 8, 4, 2, 1};




ISR(TIMER1_COMPA_vect) // timer compare interrupt service routine, called every now and then, outside of loop
{
  if (TIFR2) // Make sure its the timer interrupt.
  {
  setcolumn(displayPointer);  //column scanning
  setdata(buffer1[displayPointer]);
  PORTD = (1 << PORTD3);
  PORTD = (0 << PORTD3);

  //digitalWrite(latchPin ,HIGH);
  //digitalWrite(latchPin , LOW ); // STORECLOCK

  if (++displayPointer == 4)  //was 32, now 4 as buffer sizes changed too
  { displayPointer = 0;
  } // 32 LED row sections in total
  }
  TIFR2 = 0; // Clear timer 2 interrupt flag
}



void setcolumn(unsigned char col)  //loop that takes care of column scanning
{
  signed char pos;
  for (pos = 4; pos > -1; pos--)  //was pos=32, but again, only 4 columns now so pos=4
  {
  if (col == pos)
  {
  PORTD = (1 << PORTD2);  //digitalWrite(dataPin ,HIGH);
  }
  else
  {
  PORTD = (0 << PORTD2);  //digitalWrite(dataPin ,LOW);
  }
  digitalWrite(clockPin , HIGH);
  digitalWrite(clockPin , LOW);
  }
}



void setdata(unsigned char dat) {
  unsigned char pos;
  for (pos = 0; pos < 8; pos++)
  {
  if (dat & 16)  //these dat were 128, but changed them to 16 as 16=128/8
  {
  dat -= 16;
  PORTD = (1 << PORTD2);  //digitalWrite(dataPin ,HIGH);
  }
  else
  {
  PORTD = (0 << PORTD2);  //digitalWrite(dataPin ,LOW);} // PIN1 DATA pin
  }
  dat = dat * 2;
  digitalWrite(clockPin , HIGH);
  digitalWrite(clockPin , LOW);
  }
}



void clr() //clear
{
  int addr;
  for (addr = 0; addr < 4; addr++)  // Empty display buffer, reduced from 32 to 4
  backbuffer[addr] = 0;
}




void Blit()  //transfers data between display buffer to screen buffer
{
  int addr = 0;
  noInterrupts();  // disable all interrupts during setup
  for (addr = 0; addr < 4; addr ++)  //here also changed 32 to 4
  {
  buffer1[addr] = backbuffer[addr];  // put all data from display buffer to screen buffer
  }
  interrupts();  // enable all interrupts
}


void pixel(signed char x, signed char y, int cond)
{
  unsigned char pix, msk;
  if (x < 0 || y < 0) return;  // outside drawing limits negative
  if (x > 3 || y > 7) return;  // outside drawing limits positive, changed x>31 to x>3
  pix = power[y];
  msk = backbuffer[x];  // get exsisting data
  if (cond == 2)
  pix ^= msk;  // XOR data to screen
  if (cond == 1)
  {
  pix = ~pix;
  pix &= msk;  // AND data to screen
  }
  if (cond == 0)
  pix |= msk;  // OR data to screen
  backbuffer[x] = pix;  // apply changes
}



void charput(unsigned char ch, signed char x, signed char y)
{
  signed char x1, y1;
  unsigned char disp;
  unsigned char disp2;
  for ( x1 = 0; x1 < 8; x1++)  // eight rows, still eight bits to load so no changes
  {
  disp = font[x1 + (ch * 8)];
  for (y1 = 0; y1 < 8; y1++)  // eight pixels
  {
  disp2 = disp & power[y1];
  if (disp2 > 0)
  {
  pixel(x + x1, y + y1, 0);  // OR the pixel to the display buffer
  }
  }
  }
}



void strput(const char* ch, signed char x, signed char y)
{
  int addr;
  while (*ch )
  {
  charput(*ch++, x, y);  // write a string to the display buffer
  x += 7;
  }
}



void setup() //setup runs once
{
  signed char cntr;
  noInterrupts();  // disable all interrupts during setup
  DDRD = DDRD | B11111100;  //port registers used to set pin directions
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1 = 0;
  OCR1A = 260;  // compare match register value, was 31 for matrix (1920hz= 60hzx*32) but for now there's only 4 columns so: 4*60hz=240hz; 16mhz/256/240=260
  TCCR1B |= (1 << WGM12);  // CTC mode, free-running, clear on match
  TCCR1B |= (0 << CS10);  // 256 prescaler
  TCCR1B |= (0 << CS11);  // 256 prescaler
  TCCR1B |= (1 << CS12);  // 256 prescaler
  TIMSK1 |= (1 << OCIE1A);  // enable timer compare interrupt
  interrupts();  // enable all interrupts

} // End main



void loop()  //main loop
{
  clr();
  strput("0123", 0, 0);  //test string to draw on segments
  Blit();
}
And fontmap as attachment
And tested fontmap functionality with this sketch:
C: 
#include "FontMap7Segment.h"

int dataPin = 2;  //Define which pins will be used for the Shift Register control
int latchPin = 3;
int clockPin = 4;

boolean newData = false;
void setup()
{
  Serial.begin(9600);
  pinMode(dataPin, OUTPUT);  //Configure each IO Pin
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
}


void loop()
{
  int i=Serial.read();
  digitalWrite(latchPin, LOW);  //Pull latch LOW to start sending data
  shiftOut(dataPin, clockPin, MSBFIRST, B00000001);
  shiftOut(dataPin, clockPin, MSBFIRST, font[i]);
  digitalWrite(latchPin, HIGH);  //Pull latch HIGH to stop sending data
  delay(500);
}
 

Attachments

Last edited:
oh ya , we also need to change the setcolumn, setdata and the isr that calls them, those were the code for shift register specifically for your previous config,

how do you have 7seg hooked up , is it on shift register too?
 
Oops, forgot to mention how circuit is. So yeah, I still use shift registers as they are "easy". Two registers chained in series, first controls anodes and latter columns/digits via darligton array. First is wired to segments as q0->dot, q7->g, and that's why first, q0 is "un-used" (I don't have decimal point in use at any character). The latter has digits covered, as so; B00000001=digit 0 on, B00000010=digit 2 on etc.
So baicly quite same setup as in matrix, I'll toss schematic in A few (need to draw it first)
 
This way:
4_digit_7_segment_74595.jpg
 
in this one you no longer need setcolumn routine, instead just delete setcolumn, and change setdata sub so it bumps out one numeric value after another..

also your cathodes can go straight to ground, with the 7 seg we no longer need to call them individually
 
Dr_Doggy said:
in this one you no longer need setcolumn routine, instead just delete setcolumn, and change setdata sub so it bumps out one numeric value after another..
also your cathodes can go straight to ground, with the 7 seg we no longer need to call them individually
Click to expand...
Umm, how come cathodes straigth to ground? Aren't then all digits be on all the time and digits show same value?
This display I use:
4digit-7segment-display-white.jpg
 
Last edited:
on a glance , i noticed that in set data a number got changed to 16, change it back to 128, 128 represents that we are shifting out the msb.
same with the power variable, it should remain 128

also in charput, this equation needs to be changed: disp = font[x1 + (ch * 8)]; it is no longer *8, and i think everything with x1 can be removed,

also try debugging with pixel and charput commands before using strput, since strput relies on using charput, and charput relies on pixel and fontmap
 
also in setdata, you may need to flip polarity at cathode, by flipping the top line here with the bottom line (maybe):

PORTD = (1 << PORTD2); //digitalWrite(dataPin ,HIGH);
}
else
{
PORTD = (0 << PORTD2); //digitalWrite(dataPin ,LOW);} // PIN1 DATA pin
 
You must log in or register to reply here.

Similar threads

T
  • Question Question
Closed-loop stepper motor control problem
Replies
1
Views
2K
rjenkinsgb
rjenkinsgb
D
  • Question Question
RTC slows down after a few minutes and doesn't keep the correct time pace
Replies
9
Views
3K
Nigel Goodwin
Nigel Goodwin
A
  • Question Question
Seeed XIAO SAMD21 with PIR 250303
Replies
4
Views
2K
ahsrabrifat
A
J
  • Question Question
Controlling a Stepper Motor with Arduino
Replies
3
Views
4K
atferrari
atferrari
D
Low voltage problem with Arduino MKR CAN shield
Replies
0
Views
5K
Diver300
D

Latest threads

New Articles From Microcontroller Tips

Back
Top