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https://bitbucket.org/librepilot/librepilot.git
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710 lines
23 KiB
C
710 lines
23 KiB
C
/**
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******************************************************************************
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* @addtogroup PIOS PIOS Core hardware abstraction layer
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* @{
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* @addtogroup PIOS_USB_COM USB COM Functions
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* @brief PIOS USB COM implementation for CDC interfaces
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* @notes This implements a CDC Serial Port
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* @{
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*
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* @file pios_usb_com_cdc.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief USB COM functions (STM32 dependent code)
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "pios.h"
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#ifdef PIOS_INCLUDE_USB_CDC
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#include "pios_usb_cdc_priv.h"
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#include "pios_usb_board_data.h" /* PIOS_BOARD_*_DATA_LENGTH */
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#include "pios_usbhook.h" /* PIOS_USBHOOK_* */
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/* Implement COM layer driver API */
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static void PIOS_USB_CDC_RegisterTxCallback(uint32_t usbcdc_id, pios_com_callback tx_out_cb, uint32_t context);
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static void PIOS_USB_CDC_RegisterRxCallback(uint32_t usbcdc_id, pios_com_callback rx_in_cb, uint32_t context);
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static void PIOS_USB_CDC_RegisterCtrlLineCallback(uint32_t usbcdc_id, pios_com_callback_ctrl_line ctrl_line_cb, uint32_t context);
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static void PIOS_USB_CDC_TxStart(uint32_t usbcdc_id, uint16_t tx_bytes_avail);
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static void PIOS_USB_CDC_RxStart(uint32_t usbcdc_id, uint16_t rx_bytes_avail);
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static bool PIOS_USB_CDC_Available(uint32_t usbcdc_id);
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const struct pios_com_driver pios_usb_cdc_com_driver = {
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.tx_start = PIOS_USB_CDC_TxStart,
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.rx_start = PIOS_USB_CDC_RxStart,
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.bind_tx_cb = PIOS_USB_CDC_RegisterTxCallback,
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.bind_rx_cb = PIOS_USB_CDC_RegisterRxCallback,
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.bind_ctrl_line_cb = PIOS_USB_CDC_RegisterCtrlLineCallback,
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.available = PIOS_USB_CDC_Available,
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};
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enum pios_usb_cdc_dev_magic {
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PIOS_USB_CDC_DEV_MAGIC = 0xAABBCCDD,
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};
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struct pios_usb_cdc_dev {
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enum pios_usb_cdc_dev_magic magic;
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const struct pios_usb_cdc_cfg *cfg;
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uint32_t lower_id;
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pios_com_callback rx_in_cb;
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uint32_t rx_in_context;
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pios_com_callback tx_out_cb;
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uint32_t tx_out_context;
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pios_com_callback_ctrl_line ctrl_line_cb;
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uint32_t ctrl_line_context;
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bool usb_ctrl_if_enabled;
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bool usb_data_if_enabled;
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uint8_t rx_packet_buffer[PIOS_USB_BOARD_CDC_DATA_LENGTH] __attribute__((aligned(4)));
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volatile bool rx_active;
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/*
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* NOTE: This is -1 as somewhat of a hack. It ensures that we always send packets
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* that are strictly < maxPacketSize for this interface which means we never have
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* to bother with zero length packets (ZLP).
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*/
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uint8_t tx_packet_buffer[PIOS_USB_BOARD_CDC_DATA_LENGTH - 1] __attribute__((aligned(4)));
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volatile bool tx_active;
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uint8_t ctrl_tx_packet_buffer[PIOS_USB_BOARD_CDC_MGMT_LENGTH] __attribute__((aligned(4)));
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uint32_t rx_dropped;
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uint32_t rx_oversize;
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/*
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* Used to hold the current state of the simulated UART. Changes to this
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* variable may trigger new USB CDC Notification packets to be sent to the host.
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*/
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volatile uint16_t prev_uart_state;
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};
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static bool PIOS_USB_CDC_validate(struct pios_usb_cdc_dev *usb_cdc_dev)
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{
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return usb_cdc_dev && (usb_cdc_dev->magic == PIOS_USB_CDC_DEV_MAGIC);
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}
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#if defined(PIOS_INCLUDE_FREERTOS)
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static struct pios_usb_cdc_dev *PIOS_USB_CDC_alloc(void)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev;
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usb_cdc_dev = (struct pios_usb_cdc_dev *)pios_malloc(sizeof(struct pios_usb_cdc_dev));
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if (!usb_cdc_dev) {
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return NULL;
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}
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memset(usb_cdc_dev, 0, sizeof(struct pios_usb_cdc_dev));
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usb_cdc_dev->magic = PIOS_USB_CDC_DEV_MAGIC;
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return usb_cdc_dev;
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}
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#else
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static struct pios_usb_cdc_dev pios_usb_cdc_devs[PIOS_USB_CDC_MAX_DEVS];
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static uint8_t pios_usb_cdc_num_devs;
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static struct pios_usb_cdc_dev *PIOS_USB_CDC_alloc(void)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev;
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if (pios_usb_cdc_num_devs >= PIOS_USB_CDC_MAX_DEVS) {
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return NULL;
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}
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usb_cdc_dev = &pios_usb_cdc_devs[pios_usb_cdc_num_devs++];
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memset(usb_cdc_dev, 0, sizeof(struct pios_usb_cdc_dev));
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usb_cdc_dev->magic = PIOS_USB_CDC_DEV_MAGIC;
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return usb_cdc_dev;
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}
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#endif /* if defined(PIOS_INCLUDE_FREERTOS) */
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/* Implement USB_IFOPS for CDC Control Interface */
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static void PIOS_USB_CDC_CTRL_IF_Init(uint32_t usb_cdc_id);
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static void PIOS_USB_CDC_CTRL_IF_DeInit(uint32_t usb_cdc_id);
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static bool PIOS_USB_CDC_CTRL_IF_Setup(uint32_t usb_cdc_id, struct usb_setup_request *req);
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static void PIOS_USB_CDC_CTRL_IF_CtrlDataOut(uint32_t usb_cdc_id, const struct usb_setup_request *req);
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static struct pios_usb_ifops usb_cdc_ctrl_ifops = {
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.init = PIOS_USB_CDC_CTRL_IF_Init,
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.deinit = PIOS_USB_CDC_CTRL_IF_DeInit,
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.setup = PIOS_USB_CDC_CTRL_IF_Setup,
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.ctrl_data_out = PIOS_USB_CDC_CTRL_IF_CtrlDataOut,
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};
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/* Implement USB_IFOPS for CDC Data Interface */
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static void PIOS_USB_CDC_DATA_IF_Init(uint32_t usb_cdc_id);
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static void PIOS_USB_CDC_DATA_IF_DeInit(uint32_t usb_cdc_id);
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static bool PIOS_USB_CDC_DATA_IF_Setup(uint32_t usb_cdc_id, struct usb_setup_request *req);
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static void PIOS_USB_CDC_DATA_IF_CtrlDataOut(uint32_t usb_cdc_id, const struct usb_setup_request *req);
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static struct pios_usb_ifops usb_cdc_data_ifops = {
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.init = PIOS_USB_CDC_DATA_IF_Init,
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.deinit = PIOS_USB_CDC_DATA_IF_DeInit,
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.setup = PIOS_USB_CDC_DATA_IF_Setup,
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.ctrl_data_out = PIOS_USB_CDC_DATA_IF_CtrlDataOut,
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};
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static uint32_t pios_usb_cdc_id;
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int32_t PIOS_USB_CDC_Init(uint32_t *usbcdc_id, const struct pios_usb_cdc_cfg *cfg, uint32_t lower_id)
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{
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PIOS_Assert(usbcdc_id);
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PIOS_Assert(cfg);
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struct pios_usb_cdc_dev *usb_cdc_dev;
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usb_cdc_dev = (struct pios_usb_cdc_dev *)PIOS_USB_CDC_alloc();
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if (!usb_cdc_dev) {
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goto out_fail;
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}
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/* Bind the configuration to the device instance */
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usb_cdc_dev->cfg = cfg;
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usb_cdc_dev->lower_id = lower_id;
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pios_usb_cdc_id = (uint32_t)usb_cdc_dev;
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/* Rx and Tx are not active yet */
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usb_cdc_dev->rx_active = false;
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usb_cdc_dev->tx_active = false;
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/* Clear stats */
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usb_cdc_dev->rx_dropped = 0;
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usb_cdc_dev->rx_oversize = 0;
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/* Initialize the uart state */
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usb_cdc_dev->prev_uart_state = 0;
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/* Register class specific interface callbacks with the USBHOOK layer */
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usb_cdc_dev->usb_ctrl_if_enabled = false;
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PIOS_USBHOOK_RegisterIfOps(cfg->ctrl_if, &usb_cdc_ctrl_ifops, (uint32_t)usb_cdc_dev);
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/* Register class specific interface callbacks with the USBHOOK layer */
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usb_cdc_dev->usb_data_if_enabled = false;
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PIOS_USBHOOK_RegisterIfOps(cfg->data_if, &usb_cdc_data_ifops, (uint32_t)usb_cdc_dev);
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*usbcdc_id = (uint32_t)usb_cdc_dev;
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return 0;
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out_fail:
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return -1;
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}
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static bool PIOS_USB_CDC_SendData(struct pios_usb_cdc_dev *usb_cdc_dev)
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{
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uint16_t bytes_to_tx;
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if (!usb_cdc_dev->tx_out_cb) {
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return false;
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}
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bool need_yield = false;
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bytes_to_tx = (usb_cdc_dev->tx_out_cb)(usb_cdc_dev->tx_out_context,
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usb_cdc_dev->tx_packet_buffer,
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sizeof(usb_cdc_dev->tx_packet_buffer),
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NULL,
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&need_yield);
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if (bytes_to_tx == 0) {
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return false;
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}
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/*
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* Mark this endpoint as being tx active _before_ actually transmitting
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* to make sure we don't race with the Tx completion interrupt
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*/
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usb_cdc_dev->tx_active = true;
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PIOS_USBHOOK_EndpointTx(usb_cdc_dev->cfg->data_tx_ep,
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usb_cdc_dev->tx_packet_buffer,
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bytes_to_tx);
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#if defined(PIOS_INCLUDE_FREERTOS)
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if (need_yield) {
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vPortYield();
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}
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#endif /* PIOS_INCLUDE_FREERTOS */
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return true;
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}
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static void PIOS_USB_CDC_RxStart(uint32_t usbcdc_id, uint16_t rx_bytes_avail)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usbcdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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/* Make sure this USB interface has been initialized */
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if (!usb_cdc_dev->usb_data_if_enabled) {
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return;
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}
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if (!PIOS_USB_CheckAvailable(usb_cdc_dev->lower_id)) {
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return;
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}
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// If endpoint was stalled and there is now space make it valid
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if (!usb_cdc_dev->rx_active && (rx_bytes_avail >= PIOS_USB_BOARD_CDC_DATA_LENGTH)) {
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PIOS_USBHOOK_EndpointRx(usb_cdc_dev->cfg->data_rx_ep,
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usb_cdc_dev->rx_packet_buffer,
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sizeof(usb_cdc_dev->rx_packet_buffer));
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usb_cdc_dev->rx_active = true;
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}
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}
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static void PIOS_USB_CDC_TxStart(uint32_t usbcdc_id, __attribute__((unused)) uint16_t tx_bytes_avail)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usbcdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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/* Make sure this USB interface has been initialized */
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if (!usb_cdc_dev->usb_data_if_enabled) {
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return;
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}
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if (!PIOS_USB_CheckAvailable(usb_cdc_dev->lower_id)) {
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return;
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}
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if (!usb_cdc_dev->tx_active) {
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/* Transmitter is not currently active, send a report */
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PIOS_USB_CDC_SendData(usb_cdc_dev);
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}
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}
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static void PIOS_USB_CDC_RegisterRxCallback(uint32_t usbcdc_id, pios_com_callback rx_in_cb, uint32_t context)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usbcdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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/*
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* Order is important in these assignments since ISR uses _cb
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* field to determine if it's ok to dereference _cb and _context
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*/
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usb_cdc_dev->rx_in_context = context;
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usb_cdc_dev->rx_in_cb = rx_in_cb;
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}
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static void PIOS_USB_CDC_RegisterTxCallback(uint32_t usbcdc_id, pios_com_callback tx_out_cb, uint32_t context)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usbcdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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/*
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* Order is important in these assignments since ISR uses _cb
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* field to determine if it's ok to dereference _cb and _context
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*/
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usb_cdc_dev->tx_out_context = context;
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usb_cdc_dev->tx_out_cb = tx_out_cb;
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}
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static void PIOS_USB_CDC_RegisterCtrlLineCallback(uint32_t usbcdc_id, pios_com_callback_ctrl_line ctrl_line_cb, uint32_t context)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usbcdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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/*
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* Order is important in these assignments since ISR uses _cb
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* field to determine if it's ok to dereference _cb and _context
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*/
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usb_cdc_dev->ctrl_line_context = context;
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usb_cdc_dev->ctrl_line_cb = ctrl_line_cb;
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}
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static bool PIOS_USB_CDC_CTRL_EP_IN_Callback(uint32_t usb_cdc_id, uint8_t epnum, uint16_t len);
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static void PIOS_USB_CDC_CTRL_IF_Init(uint32_t usb_cdc_id)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usb_cdc_id;
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if (!PIOS_USB_CDC_validate(usb_cdc_dev)) {
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return;
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}
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/* Register endpoint specific callbacks with the USBHOOK layer */
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PIOS_USBHOOK_RegisterEpInCallback(usb_cdc_dev->cfg->ctrl_tx_ep,
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sizeof(usb_cdc_dev->ctrl_tx_packet_buffer),
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PIOS_USB_CDC_CTRL_EP_IN_Callback,
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(uint32_t)usb_cdc_dev);
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usb_cdc_dev->usb_ctrl_if_enabled = true;
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}
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static void PIOS_USB_CDC_CTRL_IF_DeInit(uint32_t usb_cdc_id)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usb_cdc_id;
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if (!PIOS_USB_CDC_validate(usb_cdc_dev)) {
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return;
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}
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/* DeRegister endpoint specific callbacks with the USBHOOK layer */
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usb_cdc_dev->usb_data_if_enabled = false;
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}
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static uint8_t cdc_altset;
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static struct usb_cdc_line_coding line_coding = {
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.dwDTERate = htousbl(57600),
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.bCharFormat = USB_CDC_LINE_CODING_STOP_1,
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.bParityType = USB_CDC_LINE_CODING_PARITY_NONE,
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.bDataBits = 8,
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};
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static uint16_t control_line_state;
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static bool PIOS_USB_CDC_CTRL_IF_Setup(uint32_t usb_cdc_id, struct usb_setup_request *req)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usb_cdc_id;
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if (!PIOS_USB_CDC_validate(usb_cdc_dev)) {
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return false;
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}
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/* Make sure this is a request for an interface we know about */
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uint8_t ifnum = req->wIndex & 0xFF;
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if (ifnum != usb_cdc_dev->cfg->ctrl_if) {
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return false;
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}
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switch (req->bmRequestType & (USB_REQ_TYPE_MASK | USB_REQ_RECIPIENT_MASK)) {
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case (USB_REQ_TYPE_STANDARD | USB_REQ_RECIPIENT_INTERFACE):
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switch (req->bRequest) {
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case USB_REQ_GET_INTERFACE:
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PIOS_USBHOOK_CtrlTx(&cdc_altset, 1);
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break;
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case USB_REQ_SET_INTERFACE:
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cdc_altset = (uint8_t)(req->wValue);
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break;
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default:
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/* Unhandled standard request */
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return false;
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break;
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}
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break;
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case (USB_REQ_TYPE_CLASS | USB_REQ_RECIPIENT_INTERFACE):
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switch (req->bRequest) {
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case USB_CDC_REQ_SET_LINE_CODING:
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PIOS_USBHOOK_CtrlRx((uint8_t *)&line_coding, sizeof(line_coding));
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break;
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case USB_CDC_REQ_GET_LINE_CODING:
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PIOS_USBHOOK_CtrlTx((uint8_t *)&line_coding, sizeof(line_coding));
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break;
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case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
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control_line_state = req->wValue;
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if (usb_cdc_dev->ctrl_line_cb) {
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(usb_cdc_dev->ctrl_line_cb)(usb_cdc_dev->ctrl_line_context,
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0xff,
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control_line_state);
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}
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break;
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default:
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/* Unhandled class request */
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return false;
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break;
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}
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break;
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default:
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/* Unhandled request */
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return false;
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}
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return true;
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}
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static bool PIOS_USB_CDC_Available(uint32_t usbcdc_id)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usbcdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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return PIOS_USB_CheckAvailable(usb_cdc_dev->lower_id) &&
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(control_line_state & USB_CDC_CONTROL_LINE_STATE_DTE_PRESENT);
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}
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/**
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* Called *after* the data has been written to the buffer provided in the setup stage. The
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* setup request is passed in here again so we know *which* EP0 data out has just completed.
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*/
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static void PIOS_USB_CDC_CTRL_IF_CtrlDataOut(uint32_t usb_cdc_id, const struct usb_setup_request *req)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usb_cdc_id;
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if (!PIOS_USB_CDC_validate(usb_cdc_dev)) {
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return;
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}
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/* Make sure this is a request for an interface we know about */
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uint8_t ifnum = req->wIndex & 0xFF;
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if (ifnum != usb_cdc_dev->cfg->ctrl_if) {
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return;
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}
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switch (req->bmRequestType & (USB_REQ_TYPE_MASK | USB_REQ_RECIPIENT_MASK)) {
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case (USB_REQ_TYPE_STANDARD | USB_REQ_RECIPIENT_INTERFACE):
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switch (req->bRequest) {
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default:
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/* Unhandled standard request */
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return;
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break;
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}
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break;
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case (USB_REQ_TYPE_CLASS | USB_REQ_RECIPIENT_INTERFACE):
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switch (req->bRequest) {
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case USB_CDC_REQ_SET_LINE_CODING:
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/*
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* If we cared to, this is where we would apply the new line coding
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* that is now stored in the line_coding struct. This could be used
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* to notify the upper COM layer that the baud rate has changed. This
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* may be useful in the case of a COM USB bridge where we would
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* auto-adjust the USART baud rate based on the line coding set here.
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*/
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break;
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default:
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/* Unhandled class request */
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return;
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break;
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}
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break;
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default:
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/* Unhandled request */
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return;
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}
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}
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static struct usb_cdc_serial_state_report uart_state = {
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.bmRequestType = 0xA1,
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.bNotification = USB_CDC_NOTIFICATION_SERIAL_STATE,
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.wValue = 0,
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.wIndex = htousbs(1),
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.wLength = htousbs(2),
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.bmUartState = htousbs(0),
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};
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static bool PIOS_USB_CDC_CTRL_EP_IN_Callback(
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__attribute__((unused)) uint32_t usb_cdc_id,
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__attribute__((unused)) uint8_t epnum,
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__attribute__((unused)) uint16_t len)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)pios_usb_cdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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/* Give back UART State Bitmap */
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/* UART State Bitmap
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* 15-7: reserved
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* 6: bOverRun overrun error
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* 5: bParity parity error
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* 4: bFraming framing error
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* 3: bRingSignal RI
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* 2: bBreak break reception
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* 1: bTxCarrier DSR
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* 0: bRxCarrier DCD
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*/
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/* Currently, we only handle TxCarrier and RxCarrier reporting */
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uint16_t new_uart_state = 0;
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if (usb_cdc_dev->tx_out_cb) {
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/* Someone is going to providing FC->PC data, advertise an RxCarrier to the host */
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new_uart_state |= 0x1;
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}
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if (usb_cdc_dev->rx_in_cb) {
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/* Someone is consuming PC->FC data, advertise a TxCarrier to the host */
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new_uart_state |= 0x2;
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}
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/* Has anything changed since we last sent a notification? */
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if ((new_uart_state ^ usb_cdc_dev->prev_uart_state) & 0x3) {
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usb_cdc_dev->prev_uart_state = new_uart_state;
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uart_state.bmUartState = htousbs(new_uart_state);
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PIOS_USBHOOK_EndpointTx(usb_cdc_dev->cfg->ctrl_tx_ep,
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(uint8_t *)&uart_state,
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sizeof(uart_state));
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}
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return true;
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}
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static bool PIOS_USB_CDC_DATA_EP_IN_Callback(uint32_t usb_cdc_id, uint8_t epnum, uint16_t len);
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static bool PIOS_USB_CDC_DATA_EP_OUT_Callback(uint32_t usb_cdc_id, uint8_t epnum, uint16_t len);
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static void PIOS_USB_CDC_DATA_IF_Init(uint32_t usb_cdc_id)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usb_cdc_id;
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if (!PIOS_USB_CDC_validate(usb_cdc_dev)) {
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return;
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}
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/* Register endpoint specific callbacks with the USBHOOK layer */
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PIOS_USBHOOK_RegisterEpInCallback(usb_cdc_dev->cfg->data_tx_ep,
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sizeof(usb_cdc_dev->tx_packet_buffer),
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PIOS_USB_CDC_DATA_EP_IN_Callback,
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(uint32_t)usb_cdc_dev);
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PIOS_USBHOOK_RegisterEpOutCallback(usb_cdc_dev->cfg->data_rx_ep,
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sizeof(usb_cdc_dev->rx_packet_buffer),
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PIOS_USB_CDC_DATA_EP_OUT_Callback,
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(uint32_t)usb_cdc_dev);
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usb_cdc_dev->usb_data_if_enabled = true;
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}
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static void PIOS_USB_CDC_DATA_IF_DeInit(uint32_t usb_cdc_id)
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{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)usb_cdc_id;
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if (!PIOS_USB_CDC_validate(usb_cdc_dev)) {
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return;
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}
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/* DeRegister endpoint specific callbacks with the USBHOOK layer */
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usb_cdc_dev->usb_data_if_enabled = false;
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PIOS_USBHOOK_DeRegisterEpInCallback(usb_cdc_dev->cfg->data_tx_ep);
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PIOS_USBHOOK_DeRegisterEpOutCallback(usb_cdc_dev->cfg->data_rx_ep);
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}
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static bool PIOS_USB_CDC_DATA_IF_Setup(
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__attribute__((unused)) uint32_t usb_cdc_id,
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__attribute__((unused)) struct usb_setup_request *req)
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{
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/* There are no valid EP0 transactions for CDC DATA interfaces */
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PIOS_Assert(0);
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return false;
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}
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/**
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* Called *after* the data has been written to the buffer provided in the setup stage. The
|
|
* setup request is passed in here again so we know *which* EP0 data out has just completed.
|
|
*/
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static void PIOS_USB_CDC_DATA_IF_CtrlDataOut(
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__attribute__((unused)) uint32_t usb_cdc_id,
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__attribute__((unused)) const struct usb_setup_request *req)
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{
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/* CDC DATA interfaces don't have any OUT data stages on the control endpoint */
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PIOS_Assert(0);
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}
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/**
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* @brief Callback used to indicate a transmission from device INto host completed
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* Checks if any data remains, pads it into HID packet and sends.
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*/
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static bool PIOS_USB_CDC_DATA_EP_IN_Callback(
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__attribute__((unused)) uint32_t usb_cdc_id,
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__attribute__((unused)) uint8_t epnum,
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__attribute__((unused)) uint16_t len)
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|
{
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struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)pios_usb_cdc_id;
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bool valid = PIOS_USB_CDC_validate(usb_cdc_dev);
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PIOS_Assert(valid);
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bool rc = PIOS_USB_CDC_SendData(usb_cdc_dev);
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if (!rc) {
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/* No additional data was transmitted, note that tx is no longer active */
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|
usb_cdc_dev->tx_active = false;
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|
}
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|
return rc;
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|
}
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|
|
static bool PIOS_USB_CDC_DATA_EP_OUT_Callback(
|
|
__attribute__((unused)) uint32_t usb_cdc_id,
|
|
__attribute__((unused)) uint8_t epnum,
|
|
uint16_t len)
|
|
{
|
|
struct pios_usb_cdc_dev *usb_cdc_dev = (struct pios_usb_cdc_dev *)pios_usb_cdc_id;
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|
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|
if (!PIOS_USB_CDC_validate(usb_cdc_dev)) {
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|
return false;
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|
}
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|
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|
if (len > sizeof(usb_cdc_dev->rx_packet_buffer)) {
|
|
len = sizeof(usb_cdc_dev->rx_packet_buffer);
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|
}
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if (!usb_cdc_dev->rx_in_cb) {
|
|
/* No Rx call back registered, disable the receiver */
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|
usb_cdc_dev->rx_active = false;
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|
return false;
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|
}
|
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|
|
uint16_t headroom;
|
|
bool need_yield = false;
|
|
uint16_t bytes_rxed;
|
|
bytes_rxed = (usb_cdc_dev->rx_in_cb)(usb_cdc_dev->rx_in_context,
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|
usb_cdc_dev->rx_packet_buffer,
|
|
len,
|
|
&headroom,
|
|
&need_yield);
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|
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|
if (bytes_rxed < len) {
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|
/* Lost bytes on rx */
|
|
usb_cdc_dev->rx_dropped += (len - bytes_rxed);
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|
}
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|
|
bool rc;
|
|
if (headroom >= sizeof(usb_cdc_dev->rx_packet_buffer)) {
|
|
/* We have room for a maximum length message */
|
|
PIOS_USBHOOK_EndpointRx(usb_cdc_dev->cfg->data_rx_ep,
|
|
usb_cdc_dev->rx_packet_buffer,
|
|
sizeof(usb_cdc_dev->rx_packet_buffer));
|
|
rc = true;
|
|
} else {
|
|
/* Not enough room left for a message, apply backpressure */
|
|
usb_cdc_dev->rx_active = false;
|
|
rc = false;
|
|
}
|
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|
|
#if defined(PIOS_INCLUDE_FREERTOS)
|
|
if (need_yield) {
|
|
vPortYield();
|
|
}
|
|
#endif /* PIOS_INCLUDE_FREERTOS */
|
|
|
|
return rc;
|
|
}
|
|
|
|
#endif /* PIOS_INCLUDE_USB_CDC */
|