diff --git a/.vscode/launch.json b/.vscode/launch.json
index ec932b93fd374979e88b33e7a432da27a8c54e89..76129ae9fd2a480de24ae98b0f1f90a0e178d1a7 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -355,11 +355,38 @@
                 "interface/stlink.cfg",
                 "target/stm32f4x.cfg"
             ],
-            "cwd": "${workspaceRoot}",
+            "postLaunchCommands": [
+                "monitor arm semihosting enable"
+            ],
+            "swoConfig": {
+                "enabled": true,
+                "cpuFrequency": 16000000,
+                "swoFrequency": 2000000,
+                "source": "probe",
+                "decoders": [
+                    {
+                        "type": "console",
+                        "label": "Name",
+                        "port": 0
+                    }
+                ]
+            },
+            "cwd": "${workspaceRoot}"
+        },
+        {
+            "type": "cortex-debug",
+            "request": "launch",
+            "servertype": "openocd",
+            "name": "c bare6 16Mhz",
+            "executable": "./target/thumbv7em-none-eabihf/debug/examples/bare6",
+            "configFiles": [
+                "interface/stlink.cfg",
+                "target/stm32f4x.cfg"
+            ],
             "swoConfig": {
                 "enabled": true,
                 "cpuFrequency": 16000000,
-                "swoFrequency": 1000000,
+                "swoFrequency": 2000000, // you may try 1000000 if not working
                 "source": "probe",
                 "decoders": [
                     {
@@ -368,26 +395,26 @@
                         "port": 0
                     }
                 ]
-            }
+            },
+            "cwd": "${workspaceRoot}"
         },
         {
             "type": "cortex-debug",
             "request": "launch",
             "servertype": "openocd",
-            "name": "c bare6",
+            "name": "c bare6 64Mhz",
             "executable": "./target/thumbv7em-none-eabihf/debug/examples/bare6",
             "configFiles": [
                 "interface/stlink.cfg",
                 "target/stm32f4x.cfg"
             ],
             "postLaunchCommands": [
-                "monitor tpiu config internal /tmp/itm.log uart off 16000000",
-                "monitor itm port 0 on"
+                "monitor reset init"
             ],
             "swoConfig": {
                 "enabled": true,
-                "cpuFrequency": 16000000,
-                "swoFrequency": 1000000,
+                "cpuFrequency": 64000000,
+                "swoFrequency": 2000000, // you may try 1000000 if not working
                 "source": "probe",
                 "decoders": [
                     {
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 5ce0472bc834d9e7b1f11bd28f1f5f9d8bc81f9e..83a1f77bb55101e3dcaf5653bce5102892f34313 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -5,8 +5,8 @@
     "tasks": [
         {
             "type": "shell",
-            "label": "xargo build",
-            "command": "xargo build",
+            "label": "xargo build --examples",
+            "command": "xargo build --examples",
             "problemMatcher": [
                 "$rustc"
             ],
@@ -17,128 +17,8 @@
         },
         {
             "type": "shell",
-            "label": "xargo build --release",
-            "command": "xargo build --release",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example loop",
-            "command": "xargo build --example loop",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example gpio",
-            "command": "xargo build --example gpio",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example gpio_raw",
-            "command": "xargo build --example gpio_raw",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example bare0",
-            "command": "xargo build --example bare0",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example bare1",
-            "command": "xargo build --example bare1",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example bare2",
-            "command": "xargo build --example bare2",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example bare3",
-            "command": "xargo build --example bare3",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example bare4",
-            "command": "xargo build --example bare4",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example bare5",
-            "command": "xargo build --example bare5",
-            "problemMatcher": [
-                "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "type": "shell",
-            "label": "xargo build --example bare6",
-            "command": "xargo build --example bare6",
+            "label": "xargo build --examples --release",
+            "command": "xargo build --examples --release",
             "problemMatcher": [
                 "$rustc"
             ],
diff --git a/examples/bare6.rs b/examples/bare6.rs
index d8553401c61a9c14677578e887f55d825d85bbdd..851e21f45442061a59919d40e34f132788a0cbc0 100644
--- a/examples/bare6.rs
+++ b/examples/bare6.rs
@@ -39,15 +39,17 @@ fn idle(dwt: &mut DWT, rcc: &mut RCC, gpioa: &mut GPIOA) {
     // configure PA5 as output, RM0368 8.4.1
     gpioa.moder.modify(|_, w| w.moder5().bits(1));
 
+    // at 16 Mhz, 8000_0000 cycles = 0.5s
+    // at 64 Mhz, 8000_0000 cycles = 0.125s
     loop {
         ipln!("led on");
         // set PA5 high, RM0368 8.4.7
         gpioa.bsrr.write(|w| w.bs5().set_bit());
-        wait_cycles(dwt, 10_000);
+        wait_cycles(dwt, 8000_000);
 
-        ipln!("idle off");
+        ipln!("led off");
         // set PA5 low, RM0368 8.4.7
         gpioa.bsrr.write(|w| w.br5().set_bit());
-        wait_cycles(dwt, 10_000);
+        wait_cycles(dwt, 8000_000);
     }
 }