Minimalistic USB library for STM32F103
This minimalistic library allows simple USB communication using only control packets: usb_regs.h - definition of registers ans basic macro functions. usb_desc - descriptors configuration. You may change them. usb_com - USB communication implementation. You should modify UserFunction to send your data. usb_aux - Some additional macros and types declarations. stm32f10x_usb - High level functions to init USB and handle interrupt.
How to use it? Include "stm32f10x_usb.h" header in main. Edit UserFunction in usb_com.c to precise communication policy. UserFunction is a callback function called every time when Control Packet with Endpoint Recipient and Vendor Request is received. If you useibusbX (libusbx.org) as PC's USB host library, which I strongly recommend, you should send following exemplary packet:br>
libusb_control_transfer ( handle, LIBUSB_ENDPOINT_OUT|LIBUSB_REQUEST_TYPE_VENDOR|LIBUSB_RECIPIENT_ENDPOINT, request_type, value, index, data_ptr,// should be NULL data_length, // should be 0 timeout);
Where request_type, value and index are yout data and data_ptr and data_length should be 0. It is simplest possible comunication by USB.
Next, sent structure is available in UserFunction under *sp pointer:
typedef struct _SETUP_PACKET { uint8_t bmRequestType; // request type... this is what was sent as second parameter of libusb_control_transfer uint8_t bRequest; // request_type uint16_t wValue; // value uint16_t wIndex; // index uint16_t wLength; // data_length } SetupPacket; If you want to extend your knowledge about USB please look http://www.beyondlogic.org/usbnutshell/usb1.shtml and http://www.usbmadesimple.co.uk/