src/rp2_common/pico_stdlib/stdlib.c (PicoSDK)

/* * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include "pico/stdlib.h" #if LIB_PICO_STDIO_UART #include "pico/stdio_uart.h" #else #include "pico/binary_info.h" #endif void setup_default_uart(void) { #if LIB_PICO_STDIO_UART stdio_uart_init(); #elif defined(PICO_DEFAULT_UART_BAUD_RATE) && defined(PICO_DEFAULT_UART_TX_PIN) && defined(PICO_DEFAULT_UART_RX_PIN) // this is mostly for backwards compatibility - stdio_uart_init is a bit more nuanced, and usually likely to be present uart_init(uart_default, PICO_DEFAULT_UART_BAUD_RATE); if (PICO_DEFAULT_UART_TX_PIN >= 0) gpio_set_function(PICO_DEFAULT_UART_TX_PIN, GPIO_FUNC_UART); if (PICO_DEFAULT_UART_RX_PIN >= 0) gpio_set_function(PICO_DEFAULT_UART_RX_PIN, GPIO_FUNC_UART); bi_decl_if_func_used(bi_2pins_with_func(PICO_DEFAULT_UART_RX_PIN, PICO_DEFAULT_UART_TX_PIN, GPIO_FUNC_UART)); #endif }