Posted on April 20, 2016 at 12:25Hello,
In order to send SERIAL_STATE over USB IN interrupt endpoint I had to increase the
CDC_CMD_PACKET_SIZE to 10 in
usbd_cdc.h.
Is there a way to do this in cubemx ? I'd like to keep my modification at each code regeneration.
By the way, if someone is interrested to send SERIAL_STATE here are my modifications :
In
usb_cdc_if.h add in USER CODE BEGIN EXPORTED_TYPES:
typedef union
{
uint8_t val;
struct{
unsigned dcd :1;
unsigned dsr :1;
unsigned break_err :1;
unsigned ri :1;
unsigned frame_err :1;
unsigned parity_err :1;
unsigned overrun_err :1;
unsigned reserved :1;
};
} USBD_CDC_SerialStateTypeDef;
and in USER CODE BEGIN EXPORTED_FUNCTIONS:
uint8_t CDC_Serial_State(USBD_CDC_SerialStateTypeDef serial_state);
In
usb_cdc_if.h add in USER CODE BEGIN PRIVATE_VARIABLES:
uint8_t CDC_Serial_State_Buf[10] = {
0xA1, // vmRequestType
0x20, // SERIAL_STATE
0x00, // wValue
0x00,
0x00, // wIndex
0x00,
0x02, // wLength
0x00,
0x00, // UART state bitmap
0x00,
};
and add in USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION (I know It's not private but there is no public user code section) :
/**
* @brief CDC_Serial_State
* Send SERIAL_STATE over USB IN interrupt endpoint through this function.
* @note
*
*
* @param serial_state: Uart State Bitmap Value
* @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL or USBD_BUSY
*/
uint8_t CDC_Serial_State(USBD_CDC_SerialStateTypeDef serial_state) {
USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef*)hUsbDevice_0->pClassData;
if (hcdc->TxState != 0){
return USBD_BUSY;
}
CDC_Serial_State_Buf[8] = serial_state.val;
hUsbDevice_0->ep0_state = USBD_EP0_STATUS_IN;
hUsbDevice_0->ep_in[0].total_length = 10;
hUsbDevice_0->ep_in[0].rem_length = 10;
/* Start the transfer */
USBD_LL_Transmit (hUsbDevice_0, CDC_CMD_EP, CDC_Serial_State_Buf, 10);
return USBD_OK;
}
For the moment it is only tested with RING state, on a small demo project with a stm32l4dicovery.
All improvement proposals or comments are welcome.
Regards,
#usb-cdc-serial_state
