lib: Add rp2350 files to pico-sdk

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

lib/pico-sdk/rp2350/hardware/structs/hstx_fifo.h

@@ -0,0 +1,45 @@
+// THIS HEADER FILE IS AUTOMATICALLY GENERATED -- DO NOT EDIT
+
+/**
+ * Copyright (c) 2024 Raspberry Pi Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef _HARDWARE_STRUCTS_HSTX_FIFO_H
+#define _HARDWARE_STRUCTS_HSTX_FIFO_H
+
+/**
+ * \file rp2350/hstx_fifo.h
+ */
+
+#include "hardware/address_mapped.h"
+#include "hardware/regs/hstx_fifo.h"
+
+// Reference to datasheet: https://datasheets.raspberrypi.com/rp2350/rp2350-datasheet.pdf#tab-registerlist_hstx_fifo
+//
+// The _REG_ macro is intended to help make the register navigable in your IDE (for example, using the "Go to Definition" feature)
+// _REG_(x) will link to the corresponding register in hardware/regs/hstx_fifo.h.
+//
+// Bit-field descriptions are of the form:
+// BITMASK [BITRANGE] FIELDNAME (RESETVALUE) DESCRIPTION
+
+typedef struct {
+    _REG_(HSTX_FIFO_STAT_OFFSET) // HSTX_FIFO_STAT
+    // FIFO status
+    // 0x00000400 [10]    WOF          (0) FIFO was written when full
+    // 0x00000200 [9]     EMPTY        (-) 
+    // 0x00000100 [8]     FULL         (-) 
+    // 0x000000ff [7:0]   LEVEL        (0x00) 
+    io_rw_32 stat;
+ 
+    _REG_(HSTX_FIFO_FIFO_OFFSET) // HSTX_FIFO_FIFO
+    // Write access to FIFO
+    // 0xffffffff [31:0]  FIFO         (0x00000000) 
+    io_wo_32 fifo;
+} hstx_fifo_hw_t;
+
+#define hstx_fifo_hw ((hstx_fifo_hw_t *)HSTX_FIFO_BASE)
+static_assert(sizeof (hstx_fifo_hw_t) == 0x0008, "");
+
+#endif // _HARDWARE_STRUCTS_HSTX_FIFO_H
+