diff --git a/src/cppmain.cc b/src/cppmain.cc
index 16e2f4a..7c74d5e 100644
--- a/src/cppmain.cc
+++ b/src/cppmain.cc
@@ -10,6 +10,12 @@ const double pi{ std::acos(-1) };
 #define BUFFER_SIZE 512
 
 namespace Heck {
+    bool debug_suspend_active = false;
+
+    void debug_suspend_continue() {
+        debug_suspend_active = false;
+    }
+
     // Serial Logging
     // --------------
     void log(std::string msg)
@@ -72,10 +78,7 @@ namespace Heck {
     // CALLBACKS
     void irq1_cb()
     {
-        if (!is_running) {
-            is_running = true;
-            return;
-        }
+        debug_suspend_continue();
     }
 
     void timer2_cb()
@@ -121,7 +124,7 @@ namespace Heck {
     {
         log("buffer_init_sin()");
         for (int i = 0; i < BUFFER_SIZE; i++) {
-            float p = float(i) / (float)BUFFER_SIZE - 0.5;
+            float p = float(i) / (float)BUFFER_SIZE - 0.5 / 2.;
             u32 val = sin(p) * 4096;
             audio_buffer[i] = val;
             log(std::to_string(val));
@@ -149,9 +152,7 @@ namespace Heck {
 
     void main()
     {
-        while (!is_running) {
-            HAL_Delay(1);
-        }
+        heck_debug_suspend();
         log("Starting...");
 
         dac_start_dma();
@@ -177,6 +178,14 @@ namespace Heck {
 // C Linkage (Bridging)
 // ----------------------------------------------------------------------------------------------
 
+void heck_debug_suspend(void) {
+    Heck::debug_suspend_active = true;
+    while(Heck::debug_suspend_active == true) {
+        Heck::log("debug_suspend...");
+        HAL_Delay(1000);
+    }
+}
+
 void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
 {
     if (GPIO_Pin == GPIO_PIN_0) {
@@ -238,7 +247,7 @@ void assert_failed(uint8_t *file, uint32_t line)
      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
     int str_size = 1024;
     char str[str_size];
-    snprintf(str, str_size, "assert failed: %s:%d");
+    snprintf(str, str_size, "assert failed: %s:%d",file,line);
     heck_log(str);
 }
 
diff --git a/src/cppmain.h b/src/cppmain.h
index 590d873..04698dd 100644
--- a/src/cppmain.h
+++ b/src/cppmain.h
@@ -12,6 +12,7 @@ extern "C" {
 
     void heck_cppmain(void);
     void heck_log(char* msg);
+    void heck_debug_suspend(void);
 
     void assert_failed(uint8_t* file, uint32_t line);
     void Error_Handler(void);
@@ -32,8 +33,7 @@ extern "C" {
 using u32 = uint32_t;
 
 namespace Heck {
-    bool is_running{ false };
-
+    void debug_suspend_continue();
     // Serial Logging
     void log(std::string msg);