A summary of USB

There are 3 main types of USB that are now applied:

1, interrupt mode under the host computer sent to the embedded device command:

The relevant code of the embedded software processing data is as follows:

Usbd_custom_hid_itftypedef Usbd_customhid_fops_fs =
{
CUSTOM_HID_REPORTDESC_FS,
CUSTOM_HID_INIT_FS,
CUSTOM_HID_DEINIT_FS,
CUSTOM_HID_OUTEVENT_FS,
};

Static int8_t Custom_hid_outevent_fs (uint8_t* event_idx);

To solve the problem of data source, the code in the library can only take two-byte commands, you can modify the code to take multiple bytes, modified as follows:

Usbd_classtypedef Usbd_custom_hid =
{
Usbd_custom_hid_init,
Usbd_custom_hid_deinit,
Usbd_custom_hid_setup,
NULL,/*ep0_txsent*/
Usbd_custom_hid_ep0_rxready,/*ep0_rxready*//* STATUS STAGE in * *
Usbd_custom_hid_datain,/*datain*/
Usbd_custom_hid_dataout,
NULL,/*sof */
Null
Null
Usbd_custom_hid_getcfgdesc,
Usbd_custom_hid_getcfgdesc,
Usbd_custom_hid_getcfgdesc,
Usbd_custom_hid_getdevicequalifierdesc,
};

The red part is a function that accepts USB data

Static uint8_t Usbd_custom_hid_dataout (Usbd_handletypedef *pdev,
uint8_t epnum)
{

Usbd_custom_hid_handletypedef *hhid = (usbd_custom_hid_handletypedef*) pdev->pclassdata;

((Usbd_custom_hid_itftypedef *) pdev->puserdata)->outevent (Hhid->report_buf[0],
HHID->REPORT_BUF[1]);
((Usbd_custom_hid_itftypedef *) pdev->puserdata)->outevent (HHID->REPORT_BUF);

Usbd_ll_preparereceive (Pdev, custom_hid_epout_addr, Hhid->report_buf,
Usbd_customhid_outreport_buf_size);

return USBD_OK;
}

The corresponding host computer source code processing functions are as follows:

UCHAR out_data[5]={0x02,0x00};
int ret;
OUT_DATA[1] = 0x06;//red on
OUT_DATA[2] = 0x01;
OUT_DATA[3] = 0x01;
ret = Usb_interrupt_write (g_udev[0],0x01, (char *) out_data,5,500);

Call a function of the red font to send this type of command.

2, load the read data to the host computer

Static uint8_t Usbd_custom_hid_setup (Usbd_handletypedef *pdev,
Usbd_setupreqtypedef *req)

Below this function is the value to read

Case Custom_hid_req_get_report://virgo
PROCESSREQFROMPC (Hhid->send2pcreport_buf, (uint8_t) (req->wvalue) &0x00ff);
Usbd_ctlsenddata (Pdev,hhid->send2pcreport_buf, (uint8_t) (req->wlength));
Break

#define Custom_hid_req_get_report 0x01

Upper Machine Code

int ret;
Char in_data[64] = {0x00};
ret = usb_control_msg (g_udev[0],0xa1,0x01,0x0301,0x0000,in_data,64,1000);

0x01, corresponding to Custom_hid_req_get_report.

0x0301 for the command

3, in the host computer to write embedded data

Usbd_classtypedef Usbd_custom_hid =
{
Usbd_custom_hid_init,
Usbd_custom_hid_deinit,
Usbd_custom_hid_setup,
NULL,/*ep0_txsent*/
Usbd_custom_hid_ep0_rxready,/*ep0_rxready*//* STATUS STAGE in * *
Usbd_custom_hid_datain,/*datain*/
Usbd_custom_hid_dataout,
NULL,/*sof */
Null
Null
Usbd_custom_hid_getcfgdesc,
Usbd_custom_hid_getcfgdesc,
Usbd_custom_hid_getcfgdesc,
Usbd_custom_hid_getdevicequalifierdesc,
};

Case Custom_hid_req_set_report:
G_req = req;
hhid->isreportavailable = 1;
Usbd_ctlpreparerx (Pdev, Hhid->report_buf, (uint8_t) (req->wlength));

#define Custom_hid_req_set_report 0x09

The corresponding host computer

ret = usb_control_msg (g_udev[0],0x21,0x09,0x0302,0x0000,out_data,20,1000);

Data Usbcontrol Type