mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-08-27 21:30:37 +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.
120 lines
2.9 KiB
C
120 lines
2.9 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 NEC IR receiver demonstration.
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*
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* Decodes NEC infrared remote frames on GPIO5 and prints
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* each command byte in hex and decimal 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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* GPIO5 -> IR receiver OUT (e.g. VS1838B or TSOP4838)
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* 3.3V -> IR receiver VCC
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* GND -> IR receiver GND
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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_ir.h"
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#include "rp2350_uart.h"
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#include "rp2350_xosc.h"
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/**
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* @brief Hex digit lookup table for byte-to-hex conversion.
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*/
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static const char _hex_lut[16] = "0123456789ABCDEF";
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/**
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* @brief Print a byte as a two-digit hex string over UART.
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* @param value byte to print
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* @retval None
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*/
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static void _print_hex(uint8_t value)
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{
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char buf[3];
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buf[0] = _hex_lut[value >> 4];
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buf[1] = _hex_lut[value & 0x0FU];
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buf[2] = '\0';
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uart_puts(buf);
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}
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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 byte as a decimal string over UART.
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* @param value byte to print (0-255)
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* @retval None
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*/
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static void _print_dec(uint8_t value)
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{
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char buf[4];
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_uint8_to_str(value, buf);
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uart_puts(buf);
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}
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/**
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* @brief Print a decoded NEC command in hex and decimal over UART.
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* @param command decoded command byte
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* @retval None
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*/
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static void _print_command(uint8_t command)
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{
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uart_puts("NEC command: 0x");
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_print_hex(command);
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uart_puts(" (");
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_print_dec(command);
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uart_puts(")\r\n");
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}
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/**
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* @brief Initialize clocks, timer, IR receiver, and announce over UART.
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* @retval None
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*/
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static void _ir_setup(void)
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{
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xosc_set_clk_ref();
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ir_timer_release_reset();
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ir_timer_start_tick();
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ir_init();
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uart_puts("NEC IR driver initialized on GPIO5\r\n");
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uart_puts("Press a button on your NEC remote...\r\n");
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}
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int main(void)
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{
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int command;
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_ir_setup();
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while (1) {
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command = ir_getkey();
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if (command >= 0)
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_print_command((uint8_t)command);
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}
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}
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