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usbd_gs_can: USBD_GS_CAN_GetCfgDesc(): add comment why the USBD_GS_CAN_CfgDesc is copied to RAM

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Marc Kleine-Budde 2022-12-15 09:34:57 +01:00 committed by Marc Kleine-Budde
parent fe0eef5e8f
commit 65c6eefc8b
1 changed files with 5 additions and 0 deletions
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5
src/usbd_gs_can.c
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@ -646,8 +646,13 @@ static uint8_t USBD_GS_CAN_SOF(struct _USBD_HandleTypeDef *pdev)
static uint8_t *USBD_GS_CAN_GetCfgDesc(uint16_t *len) static uint8_t *USBD_GS_CAN_GetCfgDesc(uint16_t *len)
{ {
/*
* The USB stack writes to the returned buffer, so it cannot live
* in ROM.
*/
*len = sizeof(USBD_GS_CAN_CfgDesc); *len = sizeof(USBD_GS_CAN_CfgDesc);
memcpy(USBD_DescBuf, USBD_GS_CAN_CfgDesc, sizeof(USBD_GS_CAN_CfgDesc)); memcpy(USBD_DescBuf, USBD_GS_CAN_CfgDesc, sizeof(USBD_GS_CAN_CfgDesc));
return USBD_DescBuf; return USBD_DescBuf;
} }