static void usb_request_error(void)
{
usb_stall_endpoint(ep_index(0, DIR_TX));
usb_stall_endpoint(ep_index(0, DIR_RX));
}
static void usb_handle_standard_request(const usb_setup_t& setup) {
switch(setup.bRequest) {
case USB_SET_ADDRESS:
{
const uint8_t new_address = setup.wValue_L;
UDADDR = new_address;
usb_clear_in();
usb_wait_for_in_ready();
UDADDR |= _BV(ADDEN);
}
break;
case USB_GET_DESCRIPTOR:
{
const uint8_t descriptor_index = setup.wValue_L;
const uint8_t descriptor_type = setup.wValue_H;
uint16_t length = (setup.wLength_H << 8) | setup.wLength_L;
const uint8_t* descriptor = 0;
uint8_t descriptor_length = 0;
switch( descriptor_type ) {
case USB_DESCRIPTOR_TYPE_DEVICE:
if( descriptor_index == 0 ) {
descriptor = device_descriptor;
descriptor_length = sizeof(device_descriptor);
}
break;
case USB_DESCRIPTOR_TYPE_CONFIGURATION:
if( descriptor_index == 0 ) {
descriptor = configuration_descriptor;
descriptor_length = sizeof(configuration_descriptor);
}
break;
case USB_DESCRIPTOR_TYPE_STRING:
if( descriptor_index < string_descriptors_count ) {
descriptor = string_descriptors[descriptor_index];
descriptor_length = descriptor[0];
}
break;
default:
break;
}
if( descriptor ) {
usb_write_descriptor(descriptor, descriptor_length, length);
usb_clear_in();
usb_wait_for_status_out();
usb_clear_out();
} else {
usb_stall_endpoint();
}
}
break;
case USB_GET_CONFIGURATION:
{
UEDATX = usb_configuration;
usb_clear_in();
usb_wait_for_status_out();
usb_clear_out();
}
break;
case USB_SET_CONFIGURATION:
{
const uint8_t new_configuration = setup.wValue_L;
if( new_configuration > 1 ) {
usb_stall_endpoint();
} else {
if( new_configuration == 0 ) {
// No configuration, go to ADDRESS state.
UDADDR = 0;
}
usb_configuration = new_configuration;
usb_clear_in();
usb_wait_for_in_ready();
}
}
break;
//case USB_SET_DESCRIPTOR:
//case USB_GET_STATUS:
//case USB_CLEAR_FEATURE:
//case USB_SET_FEATURE:
//case USB_GET_INTERFACE:
//case USB_SET_INTERFACE:
//case USB_SYNCH_FRAME:
default:
usb_stall_endpoint();
break;
}
}
