From 23fa9eeebe1581e4cc877a2fe52336469974ddc9 Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Thu, 8 Mar 2018 14:55:02 +0700
Subject: cdc device require SOF to operate

---
 tinyusb/class/cdc/cdc_device.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'tinyusb/class')

diff --git a/tinyusb/class/cdc/cdc_device.c b/tinyusb/class/cdc/cdc_device.c
index 4e9a22539..0b83457b5 100644
--- a/tinyusb/class/cdc/cdc_device.c
+++ b/tinyusb/class/cdc/cdc_device.c
@@ -270,6 +270,8 @@ tusb_error_t cdcd_xfer_cb(endpoint_handle_t edpt_hdl, tusb_event_t event, uint32
 
 void cdcd_sof(uint8_t coreid)
 {
+  if ( !tud_cdc_connected(coreid) ) return;
+
   endpoint_handle_t ep = cdcd_data[coreid].edpt_hdl[CDC_PIPE_DATA_IN];
 
   if ( !dcd_pipe_is_busy( ep ) )
@@ -280,14 +282,14 @@ void cdcd_sof(uint8_t coreid)
   }
 }
 
-uint32_t tud_cdc_available(uint8_t coreid)
+bool tud_cdc_connected(uint8_t coreid)
 {
-  return fifo_count(&_rx_ff);
+  return cdcd_data[coreid].connected;
 }
 
-bool tud_cdc_connected(uint8_t coreid)
+uint32_t tud_cdc_available(uint8_t coreid)
 {
-  return cdcd_data[coreid].connected;
+  return fifo_count(&_rx_ff);
 }
 
 int tud_cdc_read_char(uint8_t coreid)
-- 
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