Allow clean Legic simulation exit without button press (#668)

diff --git a/armsrc/legicrfsim.c b/armsrc/legicrfsim.c
index 07a0a62db2b5ab905ca19f2d1dac85a9f0012f17..34633f367cf7b939c7f3007ba536c8bbbc05ce87 100644 (file)
--- a/armsrc/legicrfsim.c
+++ b/armsrc/legicrfsim.c
@@ -19,6 +19,7 @@
 #include "legic_prng.h"
 #include "legic.h"
 #include "crc.h"
+#include "usb_cdc.h"  // for usb_poll_validate_length
 
 static uint8_t* legic_mem;      /* card memory, used for sim */
 static legic_card_select_t card;/* metadata of currently selected card */
@@ -439,7 +440,7 @@ void LegicRfSimulate(uint8_t cardtype) {
 
   LED_A_ON();
   DbpString("Starting Legic emulator, press button to end");
-  while(!BUTTON_PRESS()) {
+  while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
     WDT_HIT();
 
     // wait for carrier, restart after timeout