Adding RP2350 SDK and target framework (#13988)

* Adding RP2350 SDK and target framework

* Spacing

* Removing board definitions

lib/main/pico-sdk/host/hardware_uart/uart.c

@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "hardware/uart.h"
+
+#if defined(__unix) || defined(__APPLE__)
+#define _XOPEN_SOURCE 600 /* for ONLCR */
+#define __BSD_VISIBLE 1 /* for ONLCR in *BSD */
+
+#include <unistd.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+#ifndef FNONBLOCK
+#define FNONBLOCK O_NONBLOCK
+#endif
+
+struct termios _tty;
+static tcflag_t _res_oflg = 0;
+static tcflag_t _res_lflg = 0;
+
+void _resettty(void) {
+    if (!isatty(STDIN_FILENO))
+        return;
+
+    /* reset tty: */
+    _tty.c_oflag = _res_oflg;
+    _tty.c_lflag = _res_lflg;
+    tcsetattr(STDIN_FILENO, TCSADRAIN, &_tty);
+}
+
+void _inittty(void) {
+    if (!isatty(STDIN_FILENO))
+        return;
+
+    /* save tty: */
+    tcgetattr(STDIN_FILENO, &_tty);
+    _res_oflg = _tty.c_oflag;
+    _res_lflg = _tty.c_lflag;
+
+    /* set raw: */
+    _tty.c_lflag &= ~(ICANON | ICRNL);// | ISIG);
+    //_tty.c_oflag &= ~ONLCR;
+    tcsetattr(STDIN_FILENO, TCSANOW, &_tty);
+
+    fcntl(STDIN_FILENO, F_SETFL, FNONBLOCK);
+    atexit(_resettty);
+}
+
+#else
+void _inittty() {}
+#endif
+
+typedef struct {
+    bool dummy;
+} uart_hw_t;
+
+uart_inst_t *const uart0;
+uart_inst_t *const uart1;
+
+static int _nextchar = EOF;
+
+static bool _peekchar() {
+    if (_nextchar == EOF) {
+        _nextchar = getchar();
+    }
+    return _nextchar != EOF;
+}
+
+uint uart_init(uart_inst_t *uart, uint baud_rate) {
+    _inittty();
+    return baud_rate;
+}
+
+bool uart_is_writable(uart_inst_t *uart) {
+    return 1;
+}
+
+// If returns 0, no data is available to be read from UART.
+// If returns nonzero, at least that many bytes can be written without blocking.
+bool uart_is_readable(uart_inst_t *uart) {
+    return _peekchar() ? 1 : 0;
+}
+
+// Write len bytes directly from src to the UART
+void uart_write_blocking(uart_inst_t *uart, const uint8_t *src, size_t len) {
+    for (size_t i = 0; i < len; i++) {
+        uart_putc(uart, src[i]);
+    }
+}
+
+// Read len bytes directly from the UART to dst
+void uart_read_blocking(uart_inst_t *uart, uint8_t *dst, size_t len) {
+    for (size_t i = 0; i < len; i++) {
+        dst[i] = uart_getc(uart);
+    }
+}
+
+// ----------------------------------------------------------------------------
+// UART-specific operations and aliases
+
+void uart_putc(uart_inst_t *uart, char c) {
+    putchar(c);
+}
+
+void uart_putc_raw(uart_inst_t *uart, char c) {
+    putchar(c);
+}
+
+void uart_puts(uart_inst_t *uart, const char *s) {
+    puts(s);
+}
+
+char uart_getc(uart_inst_t *uart) {
+    while (!_peekchar()) {
+        tight_loop_contents();
+    }
+    char rc = (char) _nextchar;
+    _nextchar = EOF;
+    return rc;
+}
+
+void uart_default_tx_wait_blocking() {
+
+}