1 files changed, 5 insertions, 0 deletions
diff --git a/stmhal/main.c b/stmhal/main.c
index 3a15f6158..2eb5a5338 100644
--- a/stmhal/main.c
+++ b/stmhal/main.c
@@ -393,7 +393,12 @@ int main(void) {
 
     // basic sub-system init
     pendsv_init();
+    #if defined(MICROPY_HW_USE_ALT_IRQ_FOR_CDC)
+    HAL_NVIC_SetPriority(PVD_IRQn, 6, 0); // same priority as USB
+    HAL_NVIC_EnableIRQ(PVD_IRQn);
+    #else
     timer_tim3_init();
+    #endif
     led_init();
 #if MICROPY_HW_HAS_SWITCH
     switch_init0();