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415 lines
13 KiB
C
415 lines
13 KiB
C
/*
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* SPDX-FileCopyrightText: 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief USB device controller APIs
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*
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* This file contains the USB device controller APIs. All device controller
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* drivers should implement the APIs described in this file.
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*/
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* USB endpoint direction and number.
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*/
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#define USB_EP_DIR_MASK 0x80
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#define USB_EP_DIR_IN 0x80
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#define USB_EP_DIR_OUT 0x00
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/**
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* USB Driver Status Codes
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*/
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enum usb_dc_status_code {
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USB_DC_ERROR, /* USB error reported by the controller */
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USB_DC_RESET, /* USB reset */
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/* USB connection established, hardware enumeration is completed */
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USB_DC_CONNECTED,
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USB_DC_CONFIGURED, /* USB configuration done */
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USB_DC_DISCONNECTED, /* USB connection lost */
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USB_DC_SUSPEND, /* USB connection suspended by the HOST */
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USB_DC_RESUME, /* USB connection resumed by the HOST */
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USB_DC_INTERFACE, /* USB interface selected */
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USB_DC_SET_HALT, /* Set Feature ENDPOINT_HALT received */
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USB_DC_CLEAR_HALT, /* Clear Feature ENDPOINT_HALT received */
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USB_DC_UNKNOWN /* Initial USB connection status */
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};
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/**
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* USB Endpoint Callback Status Codes
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*/
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enum usb_dc_ep_cb_status_code {
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USB_DC_EP_SETUP, /* SETUP received */
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/* Out transaction on this EP, data is available for read */
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USB_DC_EP_DATA_OUT,
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USB_DC_EP_DATA_IN, /* In transaction done on this EP */
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};
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/**
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* USB Endpoint type
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*/
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enum usb_dc_ep_type {
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USB_DC_EP_CONTROL = 0, /* Control type endpoint */
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USB_DC_EP_ISOCHRONOUS, /* Isochronous type endpoint */
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USB_DC_EP_BULK, /* Bulk type endpoint */
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USB_DC_EP_INTERRUPT /* Interrupt type endpoint */
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};
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/**
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* USB Endpoint Configuration.
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*/
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struct usb_dc_ep_cfg_data {
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/** The number associated with the EP in the device
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* configuration structure
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* IN EP = 0x80 | \<endpoint number\>
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* OUT EP = 0x00 | \<endpoint number\>
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*/
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uint8_t ep_addr;
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uint16_t ep_mps; /** Endpoint max packet size */
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enum usb_dc_ep_type ep_type; /** Endpoint type */
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};
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/**
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* Callback function signature for the USB Endpoint status
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*/
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typedef void (*usb_dc_ep_callback)(uint8_t ep,
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enum usb_dc_ep_cb_status_code cb_status);
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/**
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* Callback function signature for the device
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*/
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typedef void (*usb_dc_status_callback)(enum usb_dc_status_code cb_status,
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uint8_t *param);
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/**
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* @brief attach USB for device connection
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*
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* Function to attach USB for device connection. Upon success, the USB PLL
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* is enabled, and the USB device is now capable of transmitting and receiving
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* on the USB bus and of generating interrupts.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_attach(void);
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/**
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* @brief detach the USB device
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*
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* Function to detach the USB device. Upon success, the USB hardware PLL
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* is powered down and USB communication is disabled.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_detach(void);
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/**
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* @brief reset the USB device
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*
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* This function returns the USB device and firmware back to it's initial state.
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* N.B. the USB PLL is handled by the usb_detach function
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_reset(void);
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/**
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* @brief set USB device address
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*
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* @param[in] addr device address
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_set_address(const uint8_t addr);
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/**
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* @brief set USB device controller status callback
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*
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* Function to set USB device controller status callback. The registered
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* callback is used to report changes in the status of the device controller.
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*
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* @param[in] cb callback function
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_set_status_callback(const usb_dc_status_callback cb);
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/**
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* @brief check endpoint capabilities
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*
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* Function to check capabilities of an endpoint. usb_dc_ep_cfg_data structure
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* provides the endpoint configuration parameters: endpoint address,
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* endpoint maximum packet size and endpoint type.
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* The driver should check endpoint capabilities and return 0 if the
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* endpoint configuration is possible.
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*
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* @param[in] cfg Endpoint config
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_check_cap(const struct usb_dc_ep_cfg_data *const cfg);
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/**
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* @brief configure endpoint
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*
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* Function to configure an endpoint. usb_dc_ep_cfg_data structure provides
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* the endpoint configuration parameters: endpoint address, endpoint maximum
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* packet size and endpoint type.
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*
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* @param[in] cfg Endpoint config
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_configure(const struct usb_dc_ep_cfg_data *const cfg);
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/**
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* @brief set stall condition for the selected endpoint
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_set_stall(const uint8_t ep);
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/**
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* @brief clear stall condition for the selected endpoint
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_clear_stall(const uint8_t ep);
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/**
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* @brief check if selected endpoint is stalled
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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* @param[out] stalled Endpoint stall status
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_is_stalled(const uint8_t ep, uint8_t *const stalled);
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/**
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* @brief halt the selected endpoint
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_halt(const uint8_t ep);
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/**
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* @brief enable the selected endpoint
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*
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* Function to enable the selected endpoint. Upon success interrupts are
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* enabled for the corresponding endpoint and the endpoint is ready for
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* transmitting/receiving data.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_enable(const uint8_t ep);
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/**
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* @brief disable the selected endpoint
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*
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* Function to disable the selected endpoint. Upon success interrupts are
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* disabled for the corresponding endpoint and the endpoint is no longer able
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* for transmitting/receiving data.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_disable(const uint8_t ep);
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/**
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* @brief flush the selected endpoint
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_flush(const uint8_t ep);
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/**
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* @brief write data to the specified endpoint
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*
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* This function is called to write data to the specified endpoint. The supplied
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* usb_ep_callback function will be called when data is transmitted out.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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* @param[in] data pointer to data to write
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* @param[in] data_len length of data requested to write. This may
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* be zero for a zero length status packet.
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* @param[out] ret_bytes bytes scheduled for transmission. This value
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* may be NULL if the application expects all
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* bytes to be written
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_write(const uint8_t ep, const uint8_t *const data,
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const uint32_t data_len, uint32_t *const ret_bytes);
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/**
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* @brief Indicate if the write to an IN endpoint (using usb_dc_ep_write) would block
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* to wait until the endpoint has enoug space
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 when writable, 0 when not, negative errno code on fail.
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*/
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int usb_dc_ep_write_would_block(const uint8_t ep);
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/**
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* @brief read data from the specified endpoint
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*
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* This function is called by the Endpoint handler function, after an OUT
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* interrupt has been received for that EP. The application must only call this
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* function through the supplied usb_ep_callback function. This function clears
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* the ENDPOINT NAK, if all data in the endpoint FIFO has been read,
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* so as to accept more data from host.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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* @param[in] data pointer to data buffer to write to
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* @param[in] max_data_len max length of data to read
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* @param[out] read_bytes Number of bytes read. If data is NULL and
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* max_data_len is 0 the number of bytes
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* available for read should be returned.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_read(const uint8_t ep, uint8_t *const data,
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const uint32_t max_data_len, uint32_t *const read_bytes);
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/**
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* @brief set callback function for the specified endpoint
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*
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* Function to set callback function for notification of data received and
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* available to application or transmit done on the selected endpoint,
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* NULL if callback not required by application code.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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* @param[in] cb callback function
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_set_callback(const uint8_t ep, const usb_dc_ep_callback cb);
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/**
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* @brief read data from the specified endpoint
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*
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* This is similar to usb_dc_ep_read, the difference being that, it doesn't
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* clear the endpoint NAKs so that the consumer is not bogged down by further
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* upcalls till he is done with the processing of the data. The caller should
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* reactivate ep by invoking usb_dc_ep_read_continue() do so.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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* @param[in] data pointer to data buffer to write to
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* @param[in] max_data_len max length of data to read
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* @param[out] read_bytes Number of bytes read. If data is NULL and
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* max_data_len is 0 the number of bytes
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* available for read should be returned.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_read_wait(uint8_t ep, uint8_t *data, uint32_t max_data_len,
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uint32_t *read_bytes);
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/**
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* @brief Continue reading data from the endpoint
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*
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* Clear the endpoint NAK and enable the endpoint to accept more data
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* from the host. Usually called after usb_dc_ep_read_wait() when the consumer
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* is fine to accept more data. Thus these calls together acts as flow control
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* mechanism.
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return 0 on success, negative errno code on fail.
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*/
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int usb_dc_ep_read_continue(uint8_t ep);
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/**
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* @brief Get endpoint max packet size
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*
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* @param[in] ep Endpoint address corresponding to the one
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* listed in the device configuration table
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*
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* @return enpoint max packet size (mps)
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*/
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int usb_dc_ep_mps(uint8_t ep);
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/**
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* @brief Poll for interrupts that need to be handled
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*
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* When the USB interrupt is not hooked up to an actual CPU interrupt, you
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* can call this periodically to handle the USB events that need handling.
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*/
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void usb_dc_check_poll_for_interrupts(void);
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/*
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* @brief Prepare for USB persist
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*
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* This takes the USB peripheral offline in such a way that it seems 'just busy' to the
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* host. This way, the chip can reboot (e.g. into bootloader mode) and pick up the USB
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* configuration again, without the conenction to the host being interrupted.
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*
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* @note Actual persistence is depending on USBDC_PERSIST_ENA being set in flags, as this
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* is also used to e.g. reboot into DFU mode.
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*
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* @note Please reboot soon after calling this.
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*/
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int usb_dc_prepare_persist(void);
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/*
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* @brief USB interrupt handler
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*
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* This can be hooked up by the OS to the USB peripheral interrupt.
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*/
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void usb_dw_isr_handler(void);
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/**
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* @brief Provide IDF with an interface to clear the static variable usb_dw_ctrl
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*
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*
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*/
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void usb_dw_ctrl_deinit(void);
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#ifdef __cplusplus
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}
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#endif
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