hd44780 lib issue - Githubissues

The issue

In Wokwi simulator your LCD library was not working properly. I changed the Enable pin's Clock time and now everything is OK. Following the modified code (Parallel bus access)

static esp_err_t write_nibble(const hd44780_t *lcd, uint8_t b, bool rs) { if (lcd->write_cb) { (...) } else { CHECK(gpio_set_level(lcd->pins.rs, rs)); ets_delay_us(1); // Address Setup time >= 60ns.

    CHECK(gpio_set_level(lcd->pins.d7, (b >> 3)  & 0x01));  
    CHECK(gpio_set_level(lcd->pins.d6, (b >> 2)  & 0x01));  
    CHECK(gpio_set_level(lcd->pins.d5, (b >> 1)  & 0x01));  
    CHECK(gpio_set_level(lcd->pins.d4, (b >> 0)  & 0x01));  

   //Enable clock
    CHECK(gpio_set_level(lcd->pins.e, 0));   ets_delay_us(1);
    CHECK(gpio_set_level(lcd->pins.e, true));ets_delay_us(1);
    CHECK(gpio_set_level(lcd->pins.e, 0));   ets_delay_us(100);

}

return ESP_OK;

}

Which SDK are you using?

esp-idf

Which version of SDK are you using?

master

Which build target have you used?

[X] esp32
[ ] esp32s2
[ ] esp32s3
[ ] esp32c2
[ ] esp8266
[ ] other

Component causing the issue

hd44780

Anything in the logs that might be useful for us?

No response

Additional information or context