mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-20 06:44:41 +02:00
Kevin Thomas
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/**
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* @file main.c
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* @brief NEC IR receiver demonstration.
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* @author Kevin Thomas
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* @date 2026
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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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* MIT License
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*
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* Copyright (c) 2026 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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#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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