LCD displej s radičom HD44780: Rozdiel medzi revíziami

Verzia zo dňa a času 23:39, 29. január 2021

Opis displeja

Instruction set

The HD44780 instruction set is shown below:^[1]

DDRAM is Display Data RAM and CGRAM is Character Generator RAM.^[2] The DDRAM is 80 bytes (40 per row) addressed with a gap between the two rows. The first row is addresses 0 to 39 decimal or 0 to 27 hex. The second row is addresses 64 decimal to 103 decimal or 40 to 67 hex.

The CGRAM is read/write memory used to encode up to 8 characters in the character generator. It consists of 64 fields at addresses 0 to 3F. Each field is 5 bits mapping to a row of pixels of each character. Each 8 fields in the CGRAM are used for each character. The lower 3 bits of the character codes from 0-7 and 8-15 select the groups of 8 fields in the CGRAM memory.

Reading and writing to the DDRAM is done by setting the RS input high during bus transfers. The DDRAM must also be selected by using the Set DDRAM address command which selects the DDRAM for access and also sets the starting address for DDRAM access.

Likewise reading and writing to the CGRAM is done by setting the RS input high during bus transfers. The CGRAM must also be selected by the Set CGRAM address command which selects the CGRAM for access and also sets the starting address for CGRAM access.

The execution times listed in this table are based on an oscillator frequency of 270 kHz. The data sheet indicates that for a resistor of 91 kΩ at 5V Vcc the oscillator can vary between 190 kHz and 350 kHz resulting in wait times of 52.6 us and 28.6 us instead of 37 us. If a display with the recommended 91 kΩ resistor is powered from 3.3 volts the oscillator will run much slower. If the busy bit is not used and instructions are timed by the external circuitry, this should be taken into account.

Pripojenie

Schéma zapojenia

Pokúste sa najprv pripojiť displej len podľa schémy zapojenia. Ak sa vám to nepodarí, alebo si chcete byť naistom, skontrolujte si zapojenie aj podľa zapojovacej schémy.

To, či máte displej pripojený správne si môžete vyskúšať týmto demo programom, ktorý preložíte a nahráte z prostredia Arduino.

#include <LiquidCrystal.h>
// connection      RS R/W E D4 D5 D6 D7
LiquidCrystal lcd ( 2,  3,4, 9,10,11,12);

// define some user characters
byte smiley[8] = {
  0b00000,
  0b00000,
  0b01010,
  0b00000,
  0b00000,
  0b10001,
  0b01110,
  0b00000 };

byte step1[8] = {
  0b01100, 0b01100, 0b00000, 0b01110,
  0b11100, 0b01100, 0b11010, 0b10011};

byte step2[8] = {
  0b01100, 0b01100, 0b00000, 0b01100,
  0b01100, 0b01100, 0b1100,  0b01110};

void setup() {
  lcd.begin(16, 2);    // init LCD + set number of columns and rows

  lcd.createChar(1, smiley);    // create a new characters
  lcd.createChar(3, step1);
  lcd.createChar(4, step2);

  lcd.setCursor(0, 0);          // set the cursor to the top left

  lcd.write(byte(1));           // smiley
  lcd.print(" UAMT FEI STU ");  // normal text
  lcd.write((byte)1);           // smiley 
}

void loop() {
    lcd.setCursor(2, 1);         // set curspr to line 2 col 3
    lcd.print("time: ");         // print the number of seconds since reset:
    lcd.print(millis() / 1000);
    lcd.setCursor(12, 1);
    lcd.write(3);                // draw the little man
    delay(delayTime);
    lcd.setCursor(12, 1);
    lcd.write(4);
    delay(delayTime);
}

ToDo

Na displeji by sa vám mal zobraziť text, počítadlo a jednoduchá animácia ako na obrázku

Q: Čo s nepoužitými vstupmi?

A1: pripojiť na definovanú úroveň, najlepšie cez pull-up/pull-down rezistor.

A2: Keďže podľa datasheetu^{[REF 1]} má riadiaci obvod Hitachi HD44780 zapojené pull-upy interne, tak nie sú potrebné.

A3: Keďže však nevieme, aký riadiaci čip je v skutočnosti použitý, pre istotu ich môžeme zapojiť.

Vysvetlivky, prečo sú nezapojené vstupy nebezpečné:

Nezapojené (plávajúce) vstupy sú oveľa citlivejšie na ESD (elektrostatický výboj) a taktiež zvyšujú zbytočne spotrebu obvodu. Odporúča sa pripojenie cez tzv. pull-up odpor priamo na zem, prípadne aj bez odporu. Druhá možnosť, pripojenie na kladné napájacie napätie je tiež možná, ale v tomto prípade sa vynechanie pull-up rezistora neodporúča.

Toto je jeden z príkladov mnohých takýchto odporúčaní^{[REF 2]} priamo od firmy NxP:

Literatúra

Odkazy

• Datasheets
  • Basic LCD Datasheet (PDF)
  • HD44780 (PDF)
  • Wikipedia o HD44780 https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller
• Generátor vlastných znakov
  • Online Custom Character Generator
  • https://maxpromer.github.io/LCD-Character-Creator/
• Arduino Reference Library: LiquidCrystal
• Kniznice lcd.c a lcd.h od P. Fleuryho https://github.com/damadmai/pfleury
• Tinkercad model s LCD displejom a demo programom https://www.tinkercad.com/things/iO56bA1E68T-copy-of-lcd/editel?sharecode=vmfhh-3g1G2NVAtB_BFJZQtqwN3hdpEsSGQGGtChMDc