diff options
| -rw-r--r-- | class/cdc/usbd_cdc.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/class/cdc/usbd_cdc.c b/class/cdc/usbd_cdc.c index 1820037e..e3e310f3 100644 --- a/class/cdc/usbd_cdc.c +++ b/class/cdc/usbd_cdc.c @@ -16,6 +16,7 @@ static int cdc_acm_class_interface_request_handler(struct usb_setup_packet *setu setup->bRequest); struct cdc_line_coding line_coding; + struct cdc_line_coding line_coding_last; bool dtr, rts; uint8_t intf_num = LO_BYTE(setup->wIndex); @@ -46,7 +47,13 @@ static int cdc_acm_class_interface_request_handler(struct usb_setup_packet *setu line_coding.bDataBits, parity_name[line_coding.bParityType], stop_name[line_coding.bCharFormat]); - usbd_cdc_acm_set_line_coding(intf_num, &line_coding); + + /* check if current line coding is the same with last, if they are the same, do not set line coding */ + usbd_cdc_acm_get_line_coding(intf_num, &line_coding_last); + if (memcmp(&line_coding_last, &line_coding, sizeof(struct cdc_line_coding))) { + usbd_cdc_acm_set_line_coding(intf_num, &line_coding); + } + break; case CDC_REQUEST_SET_CONTROL_LINE_STATE: { |