added chapter 3 and refactor of chapter 1 and chapter 2

openocd.ps1

@@ -0,0 +1,14 @@
+# store the current location
+$originalLocation = Get-Location
+
+try {
+    # change the location to the OpenOCD scripts directory
+    Set-Location -Path "C:\Program Files\Raspberry Pi\Pico SDK v1.5.0\openocd\scripts"
+
+    # run OpenOCD
+    ../openocd -f interface/cmsis-dap.cfg -f target/rp2040.cfg -c "adapter speed 5000"
+}
+finally {
+    # return to the original location
+    Set-Location -Path $originalLocation
+}