diff options
| -rw-r--r-- | firmware/usbstack/usb_serial.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/firmware/usbstack/usb_serial.c b/firmware/usbstack/usb_serial.c index c57c74e..8c86932 100644 --- a/firmware/usbstack/usb_serial.c +++ b/firmware/usbstack/usb_serial.c @@ -77,6 +77,8 @@ void usb_serial_send(unsigned char *data,int length) { if(!active) return; + if(length<=0) + return; mutex_lock(&sendlock); if(buffer_start+buffer_length > BUFFER_SIZE) { @@ -132,7 +134,7 @@ void usb_serial_transfer_complete(bool in, int status, int length) } busy_sending = false; - if(buffer_length!=0) + if(buffer_length>0) { sendout(); } @@ -153,8 +155,13 @@ bool usb_serial_control_request(struct usb_ctrlrequest* req) handled = true; /* we come here too after a bus reset, so reset some data */ + mutex_lock(&sendlock); busy_sending = false; - sendout(); + if(buffer_length>0) + { + sendout(); + } + mutex_unlock(&sendlock); break; default: |