mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-06-10 08:13:57 +02:00
Kevin Thomas
101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/**
|
|
* @file 0x0017_constants.c
|
|
* @brief Constants: demonstrate #define and const with LCD1602 I2C display
|
|
* @author Kevin Thomas
|
|
* @date 2025
|
|
*
|
|
* MIT License
|
|
*
|
|
* Copyright (c) 2025 Kevin Thomas
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
* -----------------------------------------------------------------------------
|
|
*
|
|
* Demonstrates #define macro constants and const-qualified variables.
|
|
* Initializes an LCD1602 display over I2C and prints constant values
|
|
* over UART in an infinite loop.
|
|
*
|
|
* Wiring:
|
|
* GPIO2 (SDA) -> LCD1602 PCF8574 SDA
|
|
* GPIO3 (SCL) -> LCD1602 PCF8574 SCL
|
|
* 3V3 -> LCD1602 VCC
|
|
* GND -> LCD1602 GND
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "pico/stdlib.h"
|
|
#include "hardware/i2c.h"
|
|
#include "lcd_1602.h"
|
|
|
|
/** @brief Macro constant for favorite number */
|
|
#define FAV_NUM 42
|
|
/** @brief I2C peripheral instance */
|
|
#define I2C_PORT i2c1
|
|
/** @brief GPIO pin for I2C SDA */
|
|
#define I2C_SDA_PIN 2
|
|
/** @brief GPIO pin for I2C SCL */
|
|
#define I2C_SCL_PIN 3
|
|
|
|
/** @brief Const-qualified favorite number */
|
|
const int OTHER_FAV_NUM = 1337;
|
|
|
|
/**
|
|
* @brief Initialize I2C bus and LCD1602 display
|
|
*
|
|
* @details Configures I2C1 at 100kHz on GPIO2/3, initializes the
|
|
* LCD via PCF8574 at address 0x27, and writes two lines.
|
|
*
|
|
* @retval None
|
|
*/
|
|
static void init_i2c_and_lcd(void) {
|
|
i2c_init(I2C_PORT, 100000);
|
|
gpio_set_function(I2C_SDA_PIN, GPIO_FUNC_I2C);
|
|
gpio_set_function(I2C_SCL_PIN, GPIO_FUNC_I2C);
|
|
gpio_pull_up(I2C_SDA_PIN);
|
|
gpio_pull_up(I2C_SCL_PIN);
|
|
lcd_i2c_init(I2C_PORT, 0x27, 4, 0x08);
|
|
}
|
|
|
|
/**
|
|
* @brief Write greeting text to the LCD display
|
|
*
|
|
* @details Sets cursor to line 0 and writes "Reverse", then sets
|
|
* cursor to line 1 and writes "Engineering".
|
|
*
|
|
* @retval None
|
|
*/
|
|
static void write_lcd_greeting(void) {
|
|
lcd_set_cursor(0, 0);
|
|
lcd_puts("Reverse");
|
|
lcd_set_cursor(1, 0);
|
|
lcd_puts("Engineering");
|
|
}
|
|
|
|
int main(void) {
|
|
stdio_init_all();
|
|
init_i2c_and_lcd();
|
|
write_lcd_greeting();
|
|
while (true) {
|
|
printf("FAV_NUM: %d\r\n", FAV_NUM);
|
|
printf("OTHER_FAV_NUM: %d\r\n", OTHER_FAV_NUM);
|
|
}
|
|
}
|