mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
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Kevin Thomas
79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/**
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* @file main.c
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* @brief UART demonstration: echo received characters back in uppercase
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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 bare-metal UART0 using the uart driver (uart.h / uart.c).
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* Characters typed into a terminal via a USB-to-UART adapter are echoed
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* back in uppercase, illustrating full-duplex raw UART operation at the
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* register level without the Pico SDK.
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*
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* Wiring:
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* GPIO0 (TX) -> USB-to-UART adapter RX
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* GPIO1 (RX) -> USB-to-UART adapter TX
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* GND -> USB-to-UART adapter GND
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*/
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#include "uart.h"
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/**
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* @brief Echo received characters back as uppercase
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*
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* @details Polls UART0 for incoming data. When a character is
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* available, reads it, converts to uppercase, and echoes
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* it back. Never returns.
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*
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* @param None
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* @retval None
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*/
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static void _echo_uppercase(void) {
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while (1) {
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if (uart_driver_is_readable()) {
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char c = uart_driver_getchar();
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char upper = uart_driver_to_upper(c);
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uart_driver_putchar(upper);
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}
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}
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}
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/**
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* @brief Application entry point for the UART uppercase echo demo
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*
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* Prints two banner messages over UART0, then enters the echo loop.
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* UART0 hardware initialization is performed by Reset_Handler before
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* main() is called.
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*
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* @return int Does not return
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*/
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int main(void) {
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uart_driver_puts("UART driver ready (115200 8N1)\r\n");
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uart_driver_puts("Type characters to echo them back in UPPERCASE:\r\n");
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_echo_uppercase();
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return 0;
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}
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