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feat(usb): add optional hook on CDC line coding change #3078

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feat(usb): add optional hook on CDC line coding change #3078

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3 changes: 3 additions & 0 deletions libraries/USBDevice/inc/usbd_cdc_if.h
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,9 @@ uint8_t CDC_getStopBits(void);
uint8_t CDC_getParity(void);
uint8_t CDC_getDataBits(void);

/* Optional board hook invoked after the host changes the CDC line coding. */
void CDC_LineCodingChanged(uint32_t bitrate);

#ifdef __cplusplus
}
#endif
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7 changes: 7 additions & 0 deletions libraries/USBDevice/src/cdc/usbd_cdc_if.c
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,12 @@ USBD_CDC_LineCodingTypeDef linecoding = {
0x08 /* nb. of bits 8*/
};

/* Boards that need a CDC line-coding side effect can override this hook. */
WEAK void CDC_LineCodingChanged(uint32_t bitrate)
{
(void)bitrate;
}

/* Private functions ---------------------------------------------------------*/

/**
Expand Down Expand Up @@ -175,6 +181,7 @@ static int8_t USBD_CDC_Control(uint8_t cmd, uint8_t *pbuf, uint16_t length)
linecoding.format = pbuf[4];
linecoding.paritytype = pbuf[5];
linecoding.datatype = pbuf[6];
CDC_LineCodingChanged(linecoding.bitrate);
break;

case CDC_GET_LINE_CODING:
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