574f944fbb
Driver for HD44780 LCDs connected directly to GPIO / to I2C by PCF8574-like GPIO expanders (#246)
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
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* Example of using driver for text LCD
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* connected to I2C by PCF8574
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*
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* Part of esp-open-rtos
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* Copyright (C) 2016 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#include <esp/uart.h>
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#include <espressif/esp_common.h>
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#include <i2c/i2c.h>
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#include <stdio.h>
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#include <hd44780/hd44780.h>
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#define SCL_PIN 5
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#define SDA_PIN 4
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#define ADDR 0x27
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static const uint8_t char_data[] = {
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0x04, 0x0e, 0x0e, 0x0e, 0x1f, 0x00, 0x04, 0x00,
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0x1f, 0x11, 0x0a, 0x04, 0x0a, 0x11, 0x1f, 0x00
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};
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void user_init(void)
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{
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uart_set_baud(0, 115200);
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printf("SDK version:%s\n", sdk_system_get_sdk_version());
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i2c_init(SCL_PIN, SDA_PIN);
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hd44780_t lcd = {
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.addr = ADDR,
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.font = HD44780_FONT_5X8,
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.lines = 2,
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.pins = {
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.rs = 0,
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.e = 2,
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.d4 = 4,
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.d5 = 5,
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.d6 = 6,
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.d7 = 7,
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.bl = 3
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},
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.backlight = true
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};
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hd44780_init(&lcd);
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hd44780_upload_character(&lcd, 0, char_data);
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hd44780_upload_character(&lcd, 1, char_data + 8);
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hd44780_gotoxy(&lcd, 0, 0);
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hd44780_puts(&lcd, "\x08 Hello world!");
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hd44780_gotoxy(&lcd, 0, 1);
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hd44780_puts(&lcd, "\x09 ");
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char time[16];
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while (true)
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{
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hd44780_gotoxy(&lcd, 2, 1);
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snprintf(time, 7, "%u ", sdk_system_get_time() / 1000000);
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time[sizeof(time) - 1] = 0;
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hd44780_puts(&lcd, time);
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for (uint32_t i = 0; i < 1000; i++)
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sdk_os_delay_us(1000);
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}
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}
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