Detect VCP line state.

* Detect VCP line state, based on SET_CONTROL_LINE_STATE request

1 files changed, 5 insertions, 0 deletions

diff --git a/stm/usb.c b/stm/usb.c
index 802a70c6d..8f408b7b1 100644
--- a/stm/usb.c
+++ b/stm/usb.c
@@ -20,6 +20,7 @@ extern CDC_IF_Prop_TypeDef VCP_fops;
 USB_OTG_CORE_HANDLE USB_OTG_Core;
 
 static int dev_is_enabled = 0;
+int dev_is_connected=0; /* used by usbd_cdc_vcp */
 static char rx_buf[64];
 static int rx_buf_in;
 static int rx_buf_out;
@@ -41,6 +42,10 @@ bool usb_vcp_is_enabled(void) {
     return dev_is_enabled;
 }
 
+bool usb_vcp_is_connected(void) {
+    return dev_is_connected;
+}
+
 void usb_vcp_receive(const char *buf, uint32_t len) {
     if (dev_is_enabled) {
         for (int i = 0; i < len; i++) {