mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-07-11 22:56:39 +02:00
Kevin Thomas
121 lines
2.9 KiB
C
121 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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{
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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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