Documentation: Add usage guide for the debugpoint command

See https://github.com/apache/nuttx-apps/pull/2549

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

Documentation/applications/system/debugpoint/index.rst

@@ -0,0 +1,57 @@
+=====================================
+``debugpoint`` Debug Utility
+=====================================
+
+``CONFIG_SYSTEM_DEBUGPOINT=y``
+
+The ``debugpoint`` utility is a tool for testing and managing debug points (breakpoints and watchpoints) in the system. It allows users to set, remove, and test various types of debug points.
+
+Usage::
+
+    debugpoint [options]
+
+Options::
+
+    -r addr  Set a read watchpoint at address
+    -w addr  Set a write watchpoint at address
+    -b addr  Set a breakpoint at address
+    -x addr  Set a read/write watchpoint at address
+    -c       Cancel the watchpoint or breakpoint (must be used with -r, -w, -b, or -x)
+    -l len   Set the watch length (must be used with -r, -w, -b, or -x)
+
+Examples::
+
+    # Set a read watchpoint at address 0x1000
+    debugpoint -r 0x1000
+
+    # Set a write watchpoint at address 0x2000
+    debugpoint -w 0x2000
+
+    # Set a breakpoint at address 0x3000
+    debugpoint -b 0x3000
+
+    # Set a read/write watchpoint at address 0x4000
+    debugpoint -x 0x4000
+
+    # Cancel the read watchpoint at address 0x1000
+    debugpoint -r 0x1000 -c
+
+    # Cancel the write watchpoint at address 0x2000
+    debugpoint -w 0x2000 -c
+
+    # Cancel the breakpoint at address 0x3000
+    debugpoint -b 0x3000 -c
+
+    # Cancel the read/write watchpoint at address 0x4000
+    debugpoint -x 0x4000 -c
+
+    # Set the watch length to 8 bytes for a read watchpoint at address 0x1000
+    debugpoint -r 0x1000 -l 8
+
+    # Set the watch length to 8 bytes for a write watchpoint at address 0x2000
+    debugpoint -w 0x2000 -l 8
+
+    # Set the watch length to 8 bytes for a breakpoint at address 0x3000
+    debugpoint -b 0x3000 -l 8
+
+The ``debug`` utility also includes automated tests for breakpoints and watchpoints. When run without any options, it will execute these tests to verify the functionality of the debug points.