Make stm use garbage collector.

1 files changed, 9 insertions, 4 deletions

diff --git a/stm/usb.c b/stm/usb.c
index 0b88e7bf7..4e8b454f1 100644
--- a/stm/usb.c
+++ b/stm/usb.c
@@ -12,11 +12,12 @@
 
 extern CDC_IF_Prop_TypeDef VCP_fops;
 
-int is_enabled = 0;
 USB_OTG_CORE_HANDLE USB_OTG_dev;
-char rx_buf[64];
-int rx_buf_in;
-int rx_buf_out;
+
+static int is_enabled = 0;
+static char rx_buf[64];
+static int rx_buf_in;
+static int rx_buf_out;
 
 void usb_init() {
     USBD_Init(&USB_OTG_dev, USB_OTG_FS_CORE_ID, &USR_desc, &USBD_PYB_cb, &USR_cb);
@@ -25,6 +26,10 @@ void usb_init() {
     is_enabled = 1;
 }
 
+bool usb_vcp_is_enabled() {
+    return is_enabled;
+}
+
 void usb_vcp_receive(const char *buf, uint32_t len) {
     if (is_enabled) {
         for (int i = 0; i < len; i++) {