#include "project.h"

#define USB_DM GPIO11
#define USB_DM_PORT GPIOA
#define USB_DP GPIO12
#define USB_DP_PORT GPIOA

/* Buffer to be used for control requests. */
uint8_t usbd_control_buffer[128];
usbd_device *usb_device;

static const struct usb_device_descriptor dev = {
  .bLength = USB_DT_DEVICE_SIZE,
  .bDescriptorType = USB_DT_DEVICE,
  .bcdUSB = 0x0200,
  .bDeviceClass = USB_CLASS_CDC,
  .bDeviceSubClass = 0,
  .bDeviceProtocol = 0,
  .bMaxPacketSize0 = 64,
  .idVendor = ID_VENDOR,
  .idProduct = ID_PRODUCT,
  .bcdDevice = 0x0200,
  .iManufacturer = 1,
  .iProduct = 2,
  .iSerialNumber = 3,
  .bNumConfigurations = 1,
};


static const struct usb_interface ifaces[] = {
  {
    .num_altsetting = 1,
    .altsetting = &comm_iface,
  },
  {
    .num_altsetting = 1,
    .altsetting = &data_iface,
  },
  {
    .num_altsetting = 1,
    .altsetting = &dfu_iface,
  },
};

static const struct usb_config_descriptor config = {
  .bLength = USB_DT_CONFIGURATION_SIZE,
  .bDescriptorType = USB_DT_CONFIGURATION,
  .wTotalLength = 0,
  .bNumInterfaces = 3,
  .bConfigurationValue = 1,
  .iConfiguration = 0,
  .bmAttributes = 0x80,
  .bMaxPower = 0x32,
  .interface = ifaces,
};

static const char *usb_strings[] = {
  VENDOR_NAME,
  PRODUCT_NAME,
  SERIAL_NUMBER,
  "DFU",
};

void otg_fs_isr (void)
{
  usbd_poll (usb_device);
}




void  usb_init (void)
{
  MAP_AF_100 (USB_DP, GPIO_AF10);
  MAP_AF_100 (USB_DM, GPIO_AF10);


  usb_device = usbd_init (&otgfs_usb_driver,
                          &dev,
                          &config,
                          usb_strings,
                          4,
                          usbd_control_buffer,
                          sizeof (usbd_control_buffer));

  /* Disable VBUS sensing */

  OTG_FS_GCCFG |= OTG_GCCFG_NOVBUSSENS;
  OTG_FS_GCCFG &= ~OTG_GCCFG_VBUSASEN;
  OTG_FS_GCCFG &= ~OTG_GCCFG_VBUSBSEN;

  usbd_register_set_config_callback (usb_device, cdcacm_set_config);


  nvic_enable_irq (NVIC_OTG_FS_IRQ);

}