390 lines
12 KiB
C
390 lines
12 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT 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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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file serial_usb.c
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* @brief Serial over USB Driver code.
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*
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* @addtogroup SERIAL_USB
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#include "usb_cdc.h"
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#if HAL_USE_SERIAL_USB || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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/*
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* Current Line Coding.
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*/
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static cdc_linecoding_t linecoding = {
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{0x00, 0x96, 0x00, 0x00}, /* 38400. */
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LC_STOP_1, LC_PARITY_NONE, 8
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};
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*
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* Interface implementation.
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*/
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static size_t write(void *ip, const uint8_t *bp, size_t n) {
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return chOQWriteTimeout(&((SerialUSBDriver *)ip)->oqueue, bp,
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n, TIME_INFINITE);
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}
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static size_t read(void *ip, uint8_t *bp, size_t n) {
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return chIQReadTimeout(&((SerialUSBDriver *)ip)->iqueue, bp,
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n, TIME_INFINITE);
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}
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static msg_t put(void *ip, uint8_t b) {
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return chOQPutTimeout(&((SerialUSBDriver *)ip)->oqueue, b, TIME_INFINITE);
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}
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static msg_t get(void *ip) {
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return chIQGetTimeout(&((SerialUSBDriver *)ip)->iqueue, TIME_INFINITE);
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}
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static msg_t putt(void *ip, uint8_t b, systime_t timeout) {
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return chOQPutTimeout(&((SerialUSBDriver *)ip)->oqueue, b, timeout);
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}
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static msg_t gett(void *ip, systime_t timeout) {
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return chIQGetTimeout(&((SerialUSBDriver *)ip)->iqueue, timeout);
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}
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static size_t writet(void *ip, const uint8_t *bp, size_t n, systime_t time) {
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return chOQWriteTimeout(&((SerialUSBDriver *)ip)->oqueue, bp, n, time);
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}
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static size_t readt(void *ip, uint8_t *bp, size_t n, systime_t time) {
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return chIQReadTimeout(&((SerialUSBDriver *)ip)->iqueue, bp, n, time);
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}
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static chnflags_t getflags(void *ip) {
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_chn_get_and_clear_flags_impl(ip);
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}
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static const struct SerialUSBDriverVMT vmt = {
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write, read, put, get,
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putt, gett, writet, readt,
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getflags
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};
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/**
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* @brief Notification of data removed from the input queue.
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*/
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static void inotify(GenericQueue *qp) {
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size_t n, maxsize;
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SerialUSBDriver *sdup = chQGetLink(qp);
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/* If the USB driver is not in the appropriate state then transactions
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must not be started.*/
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if (usbGetDriverStateI(sdup->config->usbp) != USB_ACTIVE)
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return;
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/* If there is in the queue enough space to hold at least one packet and
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a transaction is not yet started then a new transaction is started for
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the available space.*/
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maxsize = sdup->config->usbp->epc[USB_CDC_DATA_AVAILABLE_EP]->out_maxsize;
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if (!usbGetReceiveStatusI(sdup->config->usbp, USB_CDC_DATA_AVAILABLE_EP) &&
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((n = chIQGetEmptyI(&sdup->iqueue)) >= maxsize)) {
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chSysUnlock();
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n = (n / maxsize) * maxsize;
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usbPrepareQueuedReceive(sdup->config->usbp,
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USB_CDC_DATA_AVAILABLE_EP,
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&sdup->iqueue, n);
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chSysLock();
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usbStartReceiveI(sdup->config->usbp, USB_CDC_DATA_AVAILABLE_EP);
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}
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}
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/**
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* @brief Notification of data inserted into the output queue.
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*/
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static void onotify(GenericQueue *qp) {
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size_t n;
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SerialUSBDriver *sdup = chQGetLink(qp);
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/* If the USB driver is not in the appropriate state then transactions
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must not be started.*/
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if (usbGetDriverStateI(sdup->config->usbp) != USB_ACTIVE)
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return;
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/* If there is not an ongoing transaction and the output queue contains
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data then a new transaction is started.*/
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if (!usbGetTransmitStatusI(sdup->config->usbp, USB_CDC_DATA_REQUEST_EP) &&
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((n = chOQGetFullI(&sdup->oqueue)) > 0)) {
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chSysUnlock();
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usbPrepareQueuedTransmit(sdup->config->usbp,
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USB_CDC_DATA_REQUEST_EP,
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&sdup->oqueue, n);
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chSysLock();
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usbStartTransmitI(sdup->config->usbp, USB_CDC_DATA_REQUEST_EP);
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}
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}
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Serial Driver initialization.
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* @note This function is implicitly invoked by @p halInit(), there is
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* no need to explicitly initialize the driver.
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*
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* @init
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*/
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void sduInit(void) {
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}
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/**
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* @brief Initializes a generic full duplex driver object.
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* @details The HW dependent part of the initialization has to be performed
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* outside, usually in the hardware initialization code.
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*
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* @param[out] sdup pointer to a @p SerialUSBDriver structure
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*
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* @init
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*/
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void sduObjectInit(SerialUSBDriver *sdup) {
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sdup->vmt = &vmt;
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chEvtInit(&sdup->event);
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sdup->flags = CHN_NO_ERROR;
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sdup->state = SDU_STOP;
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chIQInit(&sdup->iqueue, sdup->ib, SERIAL_USB_BUFFERS_SIZE, inotify, sdup);
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chOQInit(&sdup->oqueue, sdup->ob, SERIAL_USB_BUFFERS_SIZE, onotify, sdup);
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}
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/**
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* @brief Configures and starts the driver.
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*
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* @param[in] sdup pointer to a @p SerialUSBDriver object
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* @param[in] config the serial over USB driver configuration
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*
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* @api
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*/
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void sduStart(SerialUSBDriver *sdup, const SerialUSBConfig *config) {
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chDbgCheck(sdup != NULL, "sduStart");
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chSysLock();
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chDbgAssert((sdup->state == SDU_STOP) || (sdup->state == SDU_READY),
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"sduStart(), #1",
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"invalid state");
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sdup->config = config;
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config->usbp->param = sdup;
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sdup->state = SDU_READY;
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chSysUnlock();
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usbStart(config->usbp, &config->usb_config);
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}
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/**
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* @brief Stops the driver.
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* @details Any thread waiting on the driver's queues will be awakened with
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* the message @p Q_RESET.
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*
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* @param[in] sdup pointer to a @p SerialUSBDriver object
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*
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* @api
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*/
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void sduStop(SerialUSBDriver *sdup) {
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chDbgCheck(sdup != NULL, "sdStop");
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chSysLock();
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chDbgAssert((sdup->state == SDU_STOP) || (sdup->state == SDU_READY),
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"sduStop(), #1",
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"invalid state");
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sdup->state = SDU_STOP;
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chSysUnlock();
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usbStop(sdup->config->usbp);
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}
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/**
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* @brief USB device configured handler.
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*
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* @param[in] usbp pointer to the @p USBDriver object
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*
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* @iclass
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*/
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void sduConfigureHookI(USBDriver *usbp) {
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SerialUSBDriver *sdup = usbp->param;
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sdup->flags = CHN_NO_ERROR;
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chIQResetI(&sdup->iqueue);
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chOQResetI(&sdup->oqueue);
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chnAddFlagsI(sdup, CHN_CONNECTED);
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}
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/**
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* @brief Default requests hook.
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* @details Applications wanting to use the Serial over USB driver can use
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* this function as requests hook in the USB configuration.
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* The following requests are emulated:
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* - CDC_GET_LINE_CODING.
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* - CDC_SET_LINE_CODING.
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* - CDC_SET_CONTROL_LINE_STATE.
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* .
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*
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* @param[in] usbp pointer to the @p USBDriver object
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* @return The hook status.
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* @retval TRUE Message handled internally.
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* @retval FALSE Message not handled.
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*/
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bool_t sduRequestsHook(USBDriver *usbp) {
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if ((usbp->setup[0] & USB_RTYPE_TYPE_MASK) == USB_RTYPE_TYPE_CLASS) {
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switch (usbp->setup[1]) {
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case CDC_GET_LINE_CODING:
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usbSetupTransfer(usbp, (uint8_t *)&linecoding, sizeof(linecoding), NULL);
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return TRUE;
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case CDC_SET_LINE_CODING:
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usbSetupTransfer(usbp, (uint8_t *)&linecoding, sizeof(linecoding), NULL);
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return TRUE;
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case CDC_SET_CONTROL_LINE_STATE:
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/* Nothing to do, there are no control lines.*/
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usbSetupTransfer(usbp, NULL, 0, NULL);
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return TRUE;
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default:
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return FALSE;
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}
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}
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return FALSE;
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}
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/**
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* @brief Default data transmitted callback.
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* @details The application must use this function as callback for the IN
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* data endpoint.
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*
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* @param[in] usbp pointer to the @p USBDriver object
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* @param[in] ep endpoint number
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*/
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void sduDataTransmitted(USBDriver *usbp, usbep_t ep) {
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size_t n;
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SerialUSBDriver *sdup = usbp->param;
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(void)ep;
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chSysLockFromIsr();
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chnAddFlagsI(sdup, CHN_OUTPUT_EMPTY);
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if ((n = chOQGetFullI(&sdup->oqueue)) > 0) {
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/* The endpoint cannot be busy, we are in the context of the callback,
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so it is safe to transmit without a check.*/
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chSysUnlockFromIsr();
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usbPrepareQueuedTransmit(sdup->config->usbp,
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USB_CDC_DATA_REQUEST_EP,
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&sdup->oqueue, n);
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chSysLockFromIsr();
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usbStartTransmitI(sdup->config->usbp, USB_CDC_DATA_REQUEST_EP);
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}
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chSysUnlockFromIsr();
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}
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/**
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* @brief Default data received callback.
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* @details The application must use this function as callback for the OUT
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* data endpoint.
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*
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* @param[in] usbp pointer to the @p USBDriver object
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* @param[in] ep endpoint number
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*/
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void sduDataReceived(USBDriver *usbp, usbep_t ep) {
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size_t n, maxsize;
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SerialUSBDriver *sdup = usbp->param;
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(void)ep;
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chSysLockFromIsr();
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chnAddFlagsI(sdup, CHN_INPUT_AVAILABLE);
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/* Writes to the input queue can only happen when there is enough space
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to hold at least one packet.*/
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maxsize = sdup->config->usbp->epc[USB_CDC_DATA_AVAILABLE_EP]->out_maxsize;
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if ((n = chIQGetEmptyI(&sdup->iqueue)) >= maxsize) {
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/* The endpoint cannot be busy, we are in the context of the callback,
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so a packet is in the buffer for sure.*/
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chSysUnlockFromIsr();
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n = (n / maxsize) * maxsize;
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usbPrepareQueuedReceive(sdup->config->usbp,
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USB_CDC_DATA_AVAILABLE_EP,
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&sdup->iqueue, n);
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chSysLockFromIsr();
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usbStartReceiveI(sdup->config->usbp, USB_CDC_DATA_AVAILABLE_EP);
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}
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chSysUnlockFromIsr();
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}
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/**
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* @brief Default data received callback.
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* @details The application must use this function as callback for the IN
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* interrupt endpoint.
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*
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* @param[in] usbp pointer to the @p USBDriver object
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* @param[in] ep endpoint number
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*/
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void sduInterruptTransmitted(USBDriver *usbp, usbep_t ep) {
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(void)usbp;
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(void)ep;
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}
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#endif /* HAL_USE_SERIAL */
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/** @} */
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