mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-08-15 23:50:23 +02:00
Kevin Thomas
c46bcba401
Public function docstrings belong exclusively in .h headers per coding convention. Only static helper functions and static variables retain docstrings in .c files. Removed 413 duplicate docstrings across 185 files (15 CBM + 15 C SDK projects). All 30 projects rebuild with zero errors.
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/**
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******************************************************************************
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* @file main.c
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* @author Kevin Thomas
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* @brief PWM demonstration: LED breathing effect via duty-cycle sweep.
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*
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* Demonstrates PWM output using the PWM driver. A signal on
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* GPIO 25 (onboard LED) sweeps its duty cycle from 0% to 100%
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* and back to produce a smooth breathing effect. The current
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* duty is reported over UART.
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*
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* Wiring:
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* GPIO0 -> UART TX (USB-to-UART adapter RX)
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* GPIO1 -> UART RX (USB-to-UART adapter TX)
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* GPIO25 -> Onboard LED (no external wiring needed)
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_pwm.h"
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#include "rp2350_uart.h"
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#include "rp2350_delay.h"
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#define SWEEP_STEP 5
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#define SWEEP_DELAY_MS 50
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/**
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* @brief Convert a uint8_t to a decimal string.
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* @param value number to convert (0-255)
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* @param buf output buffer (at least 4 bytes)
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* @retval None
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*/
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static void _uint8_to_str(uint8_t value, char *buf)
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{
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uint8_t idx = 0;
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if (value >= 100)
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buf[idx++] = (char)('0' + value / 100);
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if (value >= 10)
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buf[idx++] = (char)('0' + (value / 10) % 10);
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buf[idx++] = (char)('0' + value % 10);
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buf[idx] = '\0';
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}
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/**
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* @brief Print a duty percentage value as a decimal string over UART.
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* @param duty duty cycle value (0-100)
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* @retval None
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*/
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static void _print_duty(uint8_t duty)
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{
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char buf[4];
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_uint8_to_str(duty, buf);
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uart_puts("Duty: ");
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uart_puts(buf);
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uart_puts("%\r\n");
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}
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/**
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* @brief Sweep duty cycle upward from 0 to 100 percent.
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* @retval None
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*/
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static void _sweep_up(void)
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{
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for (uint8_t duty = 0; duty <= 100; duty += SWEEP_STEP) {
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pwm_set_duty(duty);
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_print_duty(duty);
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delay_ms(SWEEP_DELAY_MS);
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}
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}
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/**
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* @brief Sweep duty cycle downward from 100 to 0 percent.
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* @retval None
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*/
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static void _sweep_down(void)
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{
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for (int8_t duty = 100; duty >= 0; duty -= SWEEP_STEP) {
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pwm_set_duty((uint8_t)duty);
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_print_duty((uint8_t)duty);
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delay_ms(SWEEP_DELAY_MS);
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}
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}
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int main(void)
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{
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uart_puts("PWM initialized: GPIO25\r\n");
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while (1) {
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_sweep_up();
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_sweep_down();
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}
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}
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