diff --git a/arch/arm/src/armv7-m/arm_dbgmonitor.c b/arch/arm/src/armv7-m/arm_dbgmonitor.c
index dad81182db7..8eff53a10b3 100644
--- a/arch/arm/src/armv7-m/arm_dbgmonitor.c
+++ b/arch/arm/src/armv7-m/arm_dbgmonitor.c
@@ -633,6 +633,13 @@ int up_debugpoint_remove(int type, void *addr, size_t size)
 
 int arm_enable_dbgmonitor(void)
 {
+  if (getreg32(NVIC_DHCSR) & NVIC_DHCSR_C_DEBUGEN)
+    {
+      /* If already on debug mode(jtag/swo), just return */
+
+      return OK;
+    }
+
   arm_fpb_init();
   arm_dwt_init();
   modifyreg32(NVIC_DEMCR, 0, NVIC_DEMCR_MONEN | NVIC_DEMCR_TRCENA);
diff --git a/arch/arm/src/armv8-m/arm_dbgmonitor.c b/arch/arm/src/armv8-m/arm_dbgmonitor.c
index c887bd71bdc..43be3f7fc84 100644
--- a/arch/arm/src/armv8-m/arm_dbgmonitor.c
+++ b/arch/arm/src/armv8-m/arm_dbgmonitor.c
@@ -659,6 +659,13 @@ int up_debugpoint_remove(int type, void *addr, size_t size)
 
 int arm_enable_dbgmonitor(void)
 {
+  if (getreg32(NVIC_DHCSR) & NVIC_DHCSR_C_DEBUGEN)
+    {
+      /* If already on debug mode(jtag/swo), just return */
+
+      return OK;
+    }
+
   arm_fpb_init();
   arm_dwt_init();
   modifyreg32(NVIC_DEMCR, 0, NVIC_DEMCR_MONEN | NVIC_DEMCR_TRCENA);