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check with last to reduce set line coding repeatly

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This commit is contained in:
sakumisu
2023-05-24 16:39:36 +08:00
parent 01c6d60076
commit 77c3f17b7d
1 changed files with 8 additions and 1 deletions
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9
class/cdc/usbd_cdc.c
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@@ -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: {