mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
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Kevin Thomas
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/**
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* @file 0x01_uart.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 hardware 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 without
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* going through the stdio layer.
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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 "pico/stdlib.h"
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#include "uart.h"
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#define UART_TX_PIN 0
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#define UART_RX_PIN 1
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#define UART_BAUD 115200
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/**
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* @brief Convert a lowercase ASCII character to uppercase
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*
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* Returns the uppercase equivalent if the character is in 'a'-'z';
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* all other characters are passed through unchanged.
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*
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* @param c Input character
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* @return char Uppercase equivalent, or the original character
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*/
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static char to_upper(char c) {
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if (c >= 'a' && c <= 'z') {
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return (char)(c - 32);
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}
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return c;
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}
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int main(void) {
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uart_driver_init(UART_TX_PIN, UART_RX_PIN, UART_BAUD);
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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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while (true) {
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if (uart_driver_is_readable()) {
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char c = uart_driver_getchar();
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char upper = 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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