mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-06-10 00:03:54 +02:00
Kevin Thomas
112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/**
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* @file 0x0020_dynamic-conditionals.c
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* @brief Dynamic conditionals: UART input drives if/else and switch with servo
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* @author Kevin Thomas
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* @date 2025
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*
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* MIT License
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*
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* Copyright (c) 2025 Kevin Thomas
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* -----------------------------------------------------------------------------
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*
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* Demonstrates dynamic (runtime) conditionals using UART input via getchar().
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* Reads a character, evaluates it with if/else and switch/case, and controls
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* a servo on GPIO6 based on the input ('1' or '2').
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*
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* Wiring:
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* GPIO6 -> Servo signal wire (orange/white)
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* 5V -> Servo VCC (red)
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* GND -> Servo GND (brown/black)
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*/
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#include <stdio.h>
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#include "pico/stdlib.h"
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#include "servo.h"
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/** @brief GPIO pin number for the servo */
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#define SERVO_GPIO 6
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/**
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* @brief Evaluate choice with if/else conditional and print result
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*
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* @details Compares against hex ASCII values 0x31 ('1') and 0x32 ('2').
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*
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* @param choice character value received from UART
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* @retval None
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*/
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static void eval_if_else(uint8_t choice) {
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if (choice == 0x31) {
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printf("1\r\n");
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} else if (choice == 0x32) {
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printf("2\r\n");
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} else {
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printf("??\r\n");
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}
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}
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/**
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* @brief Sweep servo from start angle to end angle with a pause
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*
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* @details Sets the servo to start, waits 500 ms, sets to end,
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* waits 500 ms.
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*
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* @param label text to print before sweeping
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* @param start starting angle in degrees
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* @param end ending angle in degrees
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* @retval None
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*/
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static void sweep_servo(const char *label, float start, float end) {
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printf("%s\r\n", label);
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servo_set_angle(start);
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sleep_ms(500);
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servo_set_angle(end);
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sleep_ms(500);
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}
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/**
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* @brief Process choice with switch/case and drive servo accordingly
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*
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* @details On '1', sweeps servo 0->180; on '2', sweeps 180->0;
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* otherwise prints unknown.
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*
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* @param choice character value received from UART
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* @retval None
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*/
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static void process_servo_command(uint8_t choice) {
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switch (choice) {
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case '1': sweep_servo("one", 0.0f, 180.0f); break;
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case '2': sweep_servo("two", 180.0f, 0.0f); break;
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default: printf("??\r\n");
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}
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}
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int main(void) {
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stdio_init_all();
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uint8_t choice = 0;
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servo_init(SERVO_GPIO);
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while (true) {
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choice = getchar();
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eval_if_else(choice);
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process_servo_command(choice);
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}
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}
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