gweimer/lcd-i2c-init/lcd-i2c-init-v

Update LCD display on I2C. Specify Columns and up to 4 Rows. Init pin can be used to prevent extra clear displays. Null string for a Line will leave the line untouched; space will clear the line.

lcd-i2c-init-v

@/lcd-i2c-init-v

Update LCD display on I2C. Specify Columns and up to 4 Rows. Init pin can be used to prevent extra clear displays. Null string for a Line will leave the line untouched; space will clear the line.

Initboolean

Initialize LCD. Must be done at least once, but also clears screen. If you have multiple nodes for same LCD & each displays on a different line, Init false prevents clearing display and losing other lines.

ADDRnumber

I²C address of the expander chip.

ROWSnumber

Number of Rows on LCD display. MUST equal # variadic pins for L.

COLSnumber

Number of columns on LCD display. Output for each line will be truncated at this length.

BLboolean

Backlight enable/disable

INnumber

Lstring (variadic)

Text for the first line. A null string will leave line untouched. A single space (or other short string) will clear to end-of-line. Lines > ROWS will be ignored

OUTnumber

To use the node in your project you should have the gweimer/lcd-i2c-init library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.

{{#global}}
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
{{/global}}

struct State {
    LiquidCrystal_I2C* lcd;
};

{{ GENERATED_CODE }}

void printLine(LiquidCrystal_I2C* lcd, uint8_t cols, uint8_t rows, uint8_t lineIndex, XString str) {
    if (lineIndex >= rows)
        return;

    lcd->setCursor(0, lineIndex);
    uint8_t whitespace = cols;
    for (auto it = str.iterate(); it && whitespace; ++it, --whitespace)
        lcd->write(*it);

    // Clear the rest of the line
    if (whitespace < cols) {
        while (whitespace--)
            lcd->write(' ');
    }
}

void evaluate(Context ctx) {
    State* state = getState(ctx);
    auto lcd = state->lcd;
    auto rows = getValue<input_ROWS>(ctx);
    auto cols = getValue<input_COLS>(ctx);
    auto row = getValue<input_IN>(ctx);
    if (!state->lcd) {
        uint8_t addr = getValue<input_ADDR>(ctx);
        state->lcd = lcd = new LiquidCrystal_I2C(addr, cols, rows);
        if (getValue<input_Init>(ctx) && row == 0)
            lcd->begin();
    }

    printLine(lcd, cols, rows, row, getValue<input_L>(ctx));
    lcd->setBacklight(getValue<input_BL>(ctx));

    //emitValue<output_OUT1>(ctx, false);
    emitValue<output_OUT>(ctx, row + 1);
    }

lcd-i2c-init-v

gweimer/lcd-i2c-init/lcd-i2c-init-v

C++ implementation