Adding RP2350 SDK and target framework (#13988)

* Adding RP2350 SDK and target framework

* Spacing

* Removing board definitions

lib/main/pico-sdk/rp2_common/pico_atomic/include/stdatomic.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2024 Raspberry Pi (Trading) Ltd.
+ * Copyright (c) 2024 Stephen Street (stephen@redrocketcomputing.com).
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __STDATOMIC_H
+#define __STDATOMIC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \file stdatomic.h
+ * \defgroup pico_atomic pico_atomic
+ *
+ * \brief Helper implementations for C11 atomics
+ *
+ * \if rp2040_specific
+ * On RP2040 a spin lock is used as protection for all atomic operations, since there is no C library support.
+ * \endif
+ *
+ * \if rp2350_specific
+ * On RP2350 the C-library provides implementations for all 1-byte, 2-byte and 4-byte atomics using processor
+ * exclusive operations. This library provides a spin-lock protected version for arbitrary-sized atomics (including 64-bit).
+ * \endif
+*/
+#include <stdint.h>
+#include_next <stdatomic.h>
+
+// needed for PICO_C_COMPILER_IS_GNU
+#include "pico.h"
+
+#if PICO_RP2040 && PICO_C_COMPILER_IS_GNU
+// on GNU without exclusive instructions these don't get routed thru _1 functions for some reason
+#undef atomic_flag_test_and_set
+#undef atomic_flag_test_and_set_explicit
+
+extern _Bool __atomic_test_and_set_c(volatile void *mem, int model);
+
+#define atomic_flag_test_and_set(PTR) __atomic_test_and_set_c((PTR), __ATOMIC_SEQ_CST)
+#define atomic_flag_test_and_set_explicit(PTR, MO) __atomic_test_and_set_c((PTR), (MO))
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+#endif