Implementation of UDC

Internal implementation.

Data Structures
struct	udc_string_desc_t
	USB device string descriptor Structure used to transfer ASCII strings to USB String descriptor structure. More...

Functions
static usb_conf_desc_t UDC_DESC_STORAGE *	udc_get_eof_conf (void)
	Returns a value to check the end of USB Configuration descriptor. More...
usb_iface_desc_t UDC_DESC_STORAGE *	udc_get_interface_desc (void)
	Returns a pointer on the current interface descriptor. More...
static bool	udc_iface_disable (uint8_t iface_num)
	Disables an usb device interface (UDI) This routine call the UDI corresponding to interface number. More...
static bool	udc_iface_enable (uint8_t iface_num, uint8_t setting_num)
	Enables an usb device interface (UDI) This routine calls the UDI corresponding to the interface and setting number. More...
static usb_conf_desc_t UDC_DESC_STORAGE *	udc_next_desc_in_iface (usb_conf_desc_t UDC_DESC_STORAGE *desc, uint8_t desc_id)
	Search specific descriptor in global interface descriptor. More...
bool	udc_process_setup (void)
	Main routine to manage the USB SETUP request. More...
static bool	udc_req_ep (void)
	Send the SETUP interface request to UDI. More...
static bool	udc_req_iface (void)
	Send the SETUP interface request to UDI. More...
static bool	udc_req_std_dev_clear_feature (void)
	Standard device request to change device status. More...
static bool	udc_req_std_dev_get_configuration (void)
	Standard device request to get configuration number. More...
static bool	udc_req_std_dev_get_descriptor (void)
	Standard device request to get descriptors about USB device. More...
static bool	udc_req_std_dev_get_status (void)
	Standard device request to get device status. More...
static bool	udc_req_std_dev_get_str_desc (void)
	Standard device request to get device string descriptor. More...
static bool	udc_req_std_dev_set_address (void)
	Standard device request to set device address. More...
static bool	udc_req_std_dev_set_configuration (void)
	Standard device request to enable a configuration. More...
static bool	udc_req_std_dev_set_feature (void)
	Standard device request to set a feature. More...
static bool	udc_req_std_ep_clear_feature (void)
	Standard endpoint request to clear endpoint feature. More...
static bool	udc_req_std_ep_get_status (void)
	Standard endpoint request to get endpoint status. More...
static bool	udc_req_std_ep_set_feature (void)
	Standard endpoint request to halt an endpoint. More...
static bool	udc_req_std_iface_get_setting (void)
	Standard interface request to get the alternate setting number of an interface. More...
static bool	udc_req_std_iface_set_setting (void)
	Standard interface request to set an alternate setting of an interface. More...
static bool	udc_reqstd (void)
	Main routine to manage the standard USB SETUP request. More...
void	udc_reset (void)
	Reset the current configuration of the USB device, This routines can be called by UDD when a RESET on the USB line occurs. More...
void	udc_sof_notify (void)
	To signal that a SOF is occurred. More...
void	udc_start (void)
	Start the USB Device stack. More...
void	udc_stop (void)
	Stop the USB Device stack. More...
static bool	udc_update_iface_desc (uint8_t iface_num, uint8_t setting_num)
	Search an interface descriptor This routine updates the internal pointer udc_ptr_iface. More...
static void	udc_valid_address (void)
	Change the address of device Callback called at the end of request set address. More...

Internal variables to manage the USB device
static le16_t	udc_device_status
	Device status state (see enum usb_device_status in usb_protocol.h) More...
static COMPILER_WORD_ALIGNED uint8_t	udc_iface_setting = 0
	Device interface setting value. More...
static COMPILER_WORD_ALIGNED uint8_t	udc_num_configuration = 0
	Device Configuration number selected by the USB host. More...
static udc_config_speed_t UDC_DESC_STORAGE *	udc_ptr_conf
	Pointer on the selected speed device configuration. More...
static usb_iface_desc_t UDC_DESC_STORAGE *	udc_ptr_iface
	Pointer on interface descriptor used by SETUP request. More...

Internal structure to store the USB device main strings
static COMPILER_WORD_ALIGNED UDC_DESC_STORAGE usb_str_lgid_desc_t	udc_string_desc_languageid
	Language ID of USB device (US ID by default) More...
static uint8_t	udc_string_manufacturer_name [] = USB_DEVICE_MANUFACTURE_NAME
	USB device manufacture name storage String is allocated only if USB_DEVICE_MANUFACTURE_NAME is declared by usb application configuration. More...
static uint8_t	udc_string_product_name [] = USB_DEVICE_PRODUCT_NAME
	USB device product name storage String is allocated only if USB_DEVICE_PRODUCT_NAME is declared by usb application configuration. More...
static COMPILER_WORD_ALIGNED UDC_DESC_STORAGE struct udc_string_desc_t	udc_string_desc
static const uint8_t *	udc_get_string_serial_name (void)
	Get USB device serial number. More...
#define	USB_DEVICE_MANUFACTURE_NAME_SIZE   (sizeof(udc_string_manufacturer_name)-1)
#define	USB_DEVICE_PRODUCT_NAME_SIZE   (sizeof(udc_string_product_name)-1)
#define	USB_DEVICE_SERIAL_NAME_SIZE   (sizeof(USB_DEVICE_SERIAL_NAME)-1)

#define USB_DEVICE_MANUFACTURE_NAME_SIZE   (sizeof(udc_string_manufacturer_name)-1)

Referenced by udc_req_std_dev_get_str_desc().

#define USB_DEVICE_PRODUCT_NAME_SIZE   (sizeof(udc_string_product_name)-1)

Referenced by udc_req_std_dev_get_str_desc().

#define USB_DEVICE_SERIAL_NAME_SIZE   (sizeof(USB_DEVICE_SERIAL_NAME)-1)

Referenced by udc_req_std_dev_get_str_desc().

static usb_conf_desc_t UDC_DESC_STORAGE* udc_get_eof_conf ( void  )

static

Returns a value to check the end of USB Configuration descriptor.

Returns

address after the last byte of USB Configuration descriptor

References udc_config_speed_t::desc, le16_to_cpu, UDC_DESC_STORAGE, udc_ptr_conf, and usb_conf_desc_t::wTotalLength.

Referenced by udc_next_desc_in_iface(), and udc_update_iface_desc().

usb_iface_desc_t UDC_DESC_STORAGE* udc_get_interface_desc

(

void

)

Returns a pointer on the current interface descriptor.

Returns

pointer on the current interface descriptor.

References udc_ptr_iface.

Referenced by udi_hid_reqstdifaceget_descriptor().

static const uint8_t* udc_get_string_serial_name ( void  )

static

Get USB device serial number.

Use the define USB_DEVICE_SERIAL_NAME to set static serial number.

For dynamic serial number set the define USB_DEVICE_GET_SERIAL_NAME_POINTER to a suitable pointer. This will also require the serial number length define USB_DEVICE_GET_SERIAL_NAME_LENGTH.

References USB_DEVICE_SERIAL_NAME.

Referenced by udc_req_std_dev_get_str_desc().

static bool udc_iface_disable ( uint8_t  iface_num )

static

Disables an usb device interface (UDI) This routine call the UDI corresponding to interface number.

Parameters

iface_num

Interface number to disable

Returns

1 if it is done or 0 if interface is not found

References UDC_DESC_STORAGE, udc_next_desc_in_iface(), udc_ptr_conf, udc_ptr_iface, udc_update_iface_desc(), udd_ep_free(), udc_config_speed_t::udi_apis, and USB_DT_ENDPOINT.

Referenced by udc_req_std_iface_set_setting(), and udc_reset().

static bool udc_iface_enable ( uint8_t  iface_num, uint8_t  setting_num  )

static

Enables an usb device interface (UDI) This routine calls the UDI corresponding to the interface and setting number.

Parameters

iface_num	Interface number to enable
setting_num	Setting number to enable

Returns

1 if it is done or 0 if interface is not found

References udi_api_t::enable, le16_to_cpu, UDC_DESC_STORAGE, udc_next_desc_in_iface(), udc_ptr_conf, udc_ptr_iface, udc_update_iface_desc(), udd_ep_alloc(), udc_config_speed_t::udi_apis, and USB_DT_ENDPOINT.

Referenced by udc_req_std_dev_set_configuration(), and udc_req_std_iface_set_setting().

static usb_conf_desc_t UDC_DESC_STORAGE* udc_next_desc_in_iface ( usb_conf_desc_t UDC_DESC_STORAGE *  desc, uint8_t  desc_id  )

static

Search specific descriptor in global interface descriptor.

Parameters

desc	Address of interface descriptor or previous specific descriptor found
desc_id	Descriptor ID to search

Returns

address of specific descriptor found

NULL if it is the end of global interface descriptor

References UDC_DESC_STORAGE, udc_get_eof_conf(), and USB_DT_INTERFACE.

Referenced by udc_iface_disable(), and udc_iface_enable().

bool udc_process_setup

(

void

)

Main routine to manage the USB SETUP request.

Decodes and manages a setup request.

This function parses a USB SETUP request and submits an appropriate response back to the host or, in the case of SETUP OUT requests with data, sets up a buffer for receiving the data payload.

The main standard requests defined by the USB 2.0 standard are handled internally. The interface requests are sent to UDI, and the specific request sent to a specific application callback.

Returns

true if the request is supported, else the request is stalled by UDD

References udd_ctrl_request_t::callback, udd_ctrl_request_t::over_under_run, udd_ctrl_request_t::payload_size, udd_ctrl_request_t::req, udc_req_ep(), udc_req_iface(), udc_reqstd(), udd_g_ctrlreq, Udd_setup_is_in, Udd_setup_recipient, Udd_setup_type, USB_REQ_RECIP_ENDPOINT, USB_REQ_RECIP_INTERFACE, USB_REQ_TYPE_STANDARD, and usb_setup_req_t::wLength.

Referenced by udd_ctrl_setup_received().

static bool udc_req_ep ( void  )

static

Send the SETUP interface request to UDI.

Returns

true if the request is supported

References usb_conf_desc_t::bNumInterfaces, udc_config_speed_t::desc, udd_ctrl_request_t::req, UDC_DESC_STORAGE, udc_num_configuration, udc_ptr_conf, udc_update_iface_desc(), udd_g_ctrlreq, udc_config_speed_t::udi_apis, and usb_setup_req_t::wIndex.

Referenced by udc_process_setup().

static bool udc_req_iface ( void  )

static

Send the SETUP interface request to UDI.

Returns

true if the request is supported

References usb_conf_desc_t::bNumInterfaces, udc_config_speed_t::desc, udd_ctrl_request_t::req, udi_api_t::setup, UDC_DESC_STORAGE, udc_num_configuration, udc_ptr_conf, udc_update_iface_desc(), udd_g_ctrlreq, udc_config_speed_t::udi_apis, and usb_setup_req_t::wIndex.

Referenced by udc_process_setup().

static bool udc_req_std_dev_clear_feature ( void  )

static

Standard device request to change device status.

Returns

true if success

References CPU_TO_LE16, udd_ctrl_request_t::req, udc_device_status, UDC_REMOTEWAKEUP_DISABLE, udd_g_ctrlreq, USB_DEV_FEATURE_REMOTE_WAKEUP, USB_DEV_STATUS_REMOTEWAKEUP, usb_setup_req_t::wLength, and usb_setup_req_t::wValue.

Referenced by udc_reqstd().

static bool udc_req_std_dev_get_configuration ( void  )

static

Standard device request to get configuration number.

Returns

true if success

References udd_ctrl_request_t::req, udc_num_configuration, udd_g_ctrlreq, udd_set_setup_payload(), and usb_setup_req_t::wLength.

Referenced by udc_reqstd().

static bool udc_req_std_dev_get_descriptor ( void  )

static

Standard device request to get descriptors about USB device.

Returns

true if success

References usb_dev_desc_t::bLength, usb_dev_qual_desc_t::bLength, udc_config_t::conf_bos, udc_config_t::conf_hs, udc_config_t::conf_lsfs, udc_config_t::confdev_hs, udc_config_t::confdev_lsfs, udc_config_speed_t::desc, le16_to_cpu, udd_ctrl_request_t::payload, udd_ctrl_request_t::payload_size, udc_config_t::qualifier, udd_ctrl_request_t::req, udc_config, udc_req_std_dev_get_str_desc(), udd_g_ctrlreq, udd_is_high_speed(), udd_set_setup_payload(), USB_DT_BOS, USB_DT_CONFIGURATION, USB_DT_DEVICE, USB_DT_DEVICE_QUALIFIER, USB_DT_OTHER_SPEED_CONFIGURATION, USB_DT_STRING, usb_setup_req_t::wLength, usb_dev_bos_desc_t::wTotalLength, usb_conf_desc_t::wTotalLength, and usb_setup_req_t::wValue.

Referenced by udc_reqstd().

static bool udc_req_std_dev_get_status ( void  )

static

Standard device request to get device status.

Returns

true if success

References udd_ctrl_request_t::req, udc_device_status, udd_g_ctrlreq, udd_set_setup_payload(), and usb_setup_req_t::wLength.

Referenced by udc_reqstd().

static bool udc_req_std_dev_get_str_desc ( void  )

static

Standard device request to get device string descriptor.

Returns

true if success

References usb_str_desc_t::bLength, cpu_to_le16, udc_string_desc_t::header, udd_ctrl_request_t::req, udc_string_desc_t::string, udc_get_string_serial_name(), udc_string_desc_languageid, udc_string_manufacturer_name, udc_string_product_name, udd_g_ctrlreq, udd_set_setup_payload(), USB_DEVICE_MANUFACTURE_NAME_SIZE, USB_DEVICE_PRODUCT_NAME_SIZE, USB_DEVICE_SERIAL_NAME_SIZE, and usb_setup_req_t::wValue.

Referenced by udc_req_std_dev_get_descriptor().

static bool udc_req_std_dev_set_address ( void  )

static

Standard device request to set device address.

Returns

true if success

References udd_ctrl_request_t::callback, udd_ctrl_request_t::req, udc_valid_address(), udd_g_ctrlreq, and usb_setup_req_t::wLength.

Referenced by udc_reqstd().

static bool udc_req_std_dev_set_configuration ( void  )

static

Standard device request to enable a configuration.

Returns

true if success

References usb_dev_desc_t::bNumConfigurations, usb_conf_desc_t::bNumInterfaces, udc_config_t::conf_hs, udc_config_t::conf_lsfs, udc_config_t::confdev_hs, udc_config_t::confdev_lsfs, udc_config_speed_t::desc, udd_ctrl_request_t::req, udc_config, udc_iface_enable(), udc_num_configuration, udc_ptr_conf, udc_reset(), udd_g_ctrlreq, udd_getaddress(), udd_is_high_speed(), usb_setup_req_t::wLength, and usb_setup_req_t::wValue.

Referenced by udc_reqstd().

static bool udc_req_std_dev_set_feature ( void  )

static

Standard device request to set a feature.

Returns

true if success

References udd_ctrl_request_t::callback, CPU_TO_LE16, udd_ctrl_request_t::req, udc_device_status, UDC_REMOTEWAKEUP_ENABLE, udc_reset(), udd_g_ctrlreq, udd_is_high_speed(), udd_test_mode_j(), udd_test_mode_k(), udd_test_mode_packet(), udd_test_mode_se0_nak(), USB_DEV_FEATURE_REMOTE_WAKEUP, USB_DEV_FEATURE_TEST_MODE, USB_DEV_STATUS_REMOTEWAKEUP, USB_DEV_TEST_MODE_FORCE_ENABLE, USB_DEV_TEST_MODE_J, USB_DEV_TEST_MODE_K, USB_DEV_TEST_MODE_PACKET, USB_DEV_TEST_MODE_SE0_NAK, usb_setup_req_t::wIndex, usb_setup_req_t::wLength, and usb_setup_req_t::wValue.

Referenced by udc_reqstd().

static bool udc_req_std_ep_clear_feature ( void  )

static

Standard endpoint request to clear endpoint feature.

Returns

true if success

References udd_ctrl_request_t::req, udd_ep_clear_halt(), udd_g_ctrlreq, USB_EP_FEATURE_HALT, usb_setup_req_t::wIndex, usb_setup_req_t::wLength, and usb_setup_req_t::wValue.

Referenced by udc_reqstd().

static bool udc_req_std_ep_get_status ( void  )

static

Standard endpoint request to get endpoint status.

Returns

true if success

References CPU_TO_LE16, udd_ctrl_request_t::req, udd_ep_is_halted(), udd_g_ctrlreq, udd_set_setup_payload(), USB_EP_STATUS_HALTED, and usb_setup_req_t::wLength.

Referenced by udc_reqstd().

static bool udc_req_std_ep_set_feature ( void  )

static

Standard endpoint request to halt an endpoint.

Returns

true if success

References udd_ctrl_request_t::req, udd_ep_abort(), udd_ep_set_halt(), udd_g_ctrlreq, USB_EP_FEATURE_HALT, usb_setup_req_t::wIndex, usb_setup_req_t::wLength, and usb_setup_req_t::wValue.

Referenced by udc_reqstd().

static bool udc_req_std_iface_get_setting ( void  )

static

Standard interface request to get the alternate setting number of an interface.

Returns

true if success

References usb_conf_desc_t::bNumInterfaces, udc_config_speed_t::desc, udd_ctrl_request_t::req, UDC_DESC_STORAGE, udc_iface_setting, udc_num_configuration, udc_ptr_conf, udc_update_iface_desc(), udd_g_ctrlreq, udd_set_setup_payload(), udc_config_speed_t::udi_apis, usb_setup_req_t::wIndex, and usb_setup_req_t::wLength.

Referenced by udc_reqstd().

static bool udc_req_std_iface_set_setting ( void  )

static

Standard interface request to set an alternate setting of an interface.

Returns

true if success

References udd_ctrl_request_t::req, udc_iface_disable(), udc_iface_enable(), udc_num_configuration, udd_g_ctrlreq, usb_setup_req_t::wIndex, usb_setup_req_t::wLength, and usb_setup_req_t::wValue.

Referenced by udc_reqstd().

static bool udc_reqstd ( void  )

static

Main routine to manage the standard USB SETUP request.

Returns

true if the request is supported

References usb_setup_req_t::bRequest, udd_ctrl_request_t::req, udc_req_std_dev_clear_feature(), udc_req_std_dev_get_configuration(), udc_req_std_dev_get_descriptor(), udc_req_std_dev_get_status(), udc_req_std_dev_set_address(), udc_req_std_dev_set_configuration(), udc_req_std_dev_set_feature(), udc_req_std_ep_clear_feature(), udc_req_std_ep_get_status(), udc_req_std_ep_set_feature(), udc_req_std_iface_get_setting(), udc_req_std_iface_set_setting(), udd_g_ctrlreq, Udd_setup_is_in, Udd_setup_recipient, USB_REQ_CLEAR_FEATURE, USB_REQ_GET_CONFIGURATION, USB_REQ_GET_DESCRIPTOR, USB_REQ_GET_INTERFACE, USB_REQ_GET_STATUS, USB_REQ_RECIP_DEVICE, USB_REQ_RECIP_ENDPOINT, USB_REQ_RECIP_INTERFACE, USB_REQ_SET_ADDRESS, USB_REQ_SET_CONFIGURATION, USB_REQ_SET_DESCRIPTOR, USB_REQ_SET_FEATURE, USB_REQ_SET_INTERFACE, and usb_setup_req_t::wLength.

Referenced by udc_process_setup().

void udc_reset

(

void

)

Reset the current configuration of the USB device, This routines can be called by UDD when a RESET on the USB line occurs.

Reset the UDC.

References usb_conf_desc_t::bNumInterfaces, CPU_TO_LE16, udc_config_speed_t::desc, udc_device_status, udc_iface_disable(), udc_num_configuration, udc_ptr_conf, UDC_REMOTEWAKEUP_DISABLE, USB_DEV_STATUS_BUS_POWERED, USB_DEV_STATUS_REMOTEWAKEUP, and USB_DEV_STATUS_SELF_POWERED.

Referenced by if(), udc_req_std_dev_set_configuration(), udc_req_std_dev_set_feature(), and udc_stop().

void udc_sof_notify

(

void

)

To signal that a SOF is occurred.

The UDC must send the signal to all UDIs enabled

References usb_conf_desc_t::bNumInterfaces, udc_config_speed_t::desc, udi_api_t::sof_notify, udc_num_configuration, udc_ptr_conf, and udc_config_speed_t::udi_apis.

void udc_start

(

void

)

Start the USB Device stack.

References udd_enable().

Referenced by main().

void udc_stop

(

void

)

Stop the USB Device stack.

References udc_reset(), and udd_disable().

static bool udc_update_iface_desc ( uint8_t  iface_num, uint8_t  setting_num  )

static

Search an interface descriptor This routine updates the internal pointer udc_ptr_iface.

Parameters

iface_num	Interface number to find in Configuration Descriptor
setting_num	Setting number of interface to find

Returns

1 if found or 0 if not found

References usb_iface_desc_t::bAlternateSetting, usb_iface_desc_t::bDescriptorType, usb_iface_desc_t::bInterfaceNumber, usb_iface_desc_t::bLength, usb_conf_desc_t::bNumInterfaces, udc_config_speed_t::desc, UDC_DESC_STORAGE, udc_get_eof_conf(), udc_num_configuration, udc_ptr_conf, udc_ptr_iface, and USB_DT_INTERFACE.

Referenced by udc_iface_disable(), udc_iface_enable(), udc_req_ep(), udc_req_iface(), and udc_req_std_iface_get_setting().

static void udc_valid_address ( void  )

static

Change the address of device Callback called at the end of request set address.

References udd_ctrl_request_t::req, udd_g_ctrlreq, udd_set_address(), and usb_setup_req_t::wValue.

Referenced by udc_req_std_dev_set_address().

le16_t udc_device_status

static

Device status state (see enum usb_device_status in usb_protocol.h)

Referenced by udc_req_std_dev_clear_feature(), udc_req_std_dev_get_status(), udc_req_std_dev_set_feature(), and udc_reset().

COMPILER_WORD_ALIGNED uint8_t udc_iface_setting = 0

static

Device interface setting value.

Referenced by udc_req_std_iface_get_setting().

COMPILER_WORD_ALIGNED uint8_t udc_num_configuration = 0

static

Device Configuration number selected by the USB host.

Referenced by udc_req_ep(), udc_req_iface(), udc_req_std_dev_get_configuration(), udc_req_std_dev_set_configuration(), udc_req_std_iface_get_setting(), udc_req_std_iface_set_setting(), udc_reset(), udc_sof_notify(), and udc_update_iface_desc().

udc_config_speed_t UDC_DESC_STORAGE* udc_ptr_conf

static

Pointer on the selected speed device configuration.

Referenced by udc_get_eof_conf(), udc_iface_disable(), udc_iface_enable(), udc_req_ep(), udc_req_iface(), udc_req_std_dev_set_configuration(), udc_req_std_iface_get_setting(), udc_reset(), udc_sof_notify(), and udc_update_iface_desc().

usb_iface_desc_t UDC_DESC_STORAGE* udc_ptr_iface

static

Pointer on interface descriptor used by SETUP request.

Referenced by udc_get_interface_desc(), udc_iface_disable(), udc_iface_enable(), and udc_update_iface_desc().

COMPILER_WORD_ALIGNED UDC_DESC_STORAGE struct udc_string_desc_t udc_string_desc

static

Initial value:

= {
    .header.bDescriptorType = USB_DT_STRING
}

COMPILER_WORD_ALIGNED UDC_DESC_STORAGE usb_str_lgid_desc_t udc_string_desc_languageid

static

Initial value:

= {
    .desc.bLength = sizeof(usb_str_lgid_desc_t),
    .desc.bDescriptorType = USB_DT_STRING,
    .string = {LE16(USB_LANGID_EN_US)}
}

Language ID of USB device (US ID by default)

Referenced by udc_req_std_dev_get_str_desc().

uint8_t udc_string_manufacturer_name[] = USB_DEVICE_MANUFACTURE_NAME

static

USB device manufacture name storage String is allocated only if USB_DEVICE_MANUFACTURE_NAME is declared by usb application configuration.

Referenced by udc_req_std_dev_get_str_desc().

uint8_t udc_string_product_name[] = USB_DEVICE_PRODUCT_NAME

static

USB device product name storage String is allocated only if USB_DEVICE_PRODUCT_NAME is declared by usb application configuration.

Referenced by udc_req_std_dev_get_str_desc().