508 lines
14 KiB
C
508 lines
14 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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 STM32/usb_lld.c
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* @brief STM32 USB subsystem low level driver source.
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*
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* @addtogroup 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.h"
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#if HAL_USE_USB || defined(__DOXYGEN__)
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#define BTABLE_ADDR 0x0000
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/** @brief USB1 driver identifier.*/
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#if STM32_USB_USE_USB1 || defined(__DOXYGEN__)
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USBDriver USBD1;
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#endif
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/**
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* @brief EP0 initialization structure.
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*/
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const USBEndpointConfig usb_lld_ep0config = {
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_usb_ep0in,
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_usb_ep0out,
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0x40,
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0x40,
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EPR_EP_TYPE_CONTROL | EPR_STAT_TX_STALL | EPR_STAT_RX_VALID,
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0x40,
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0x80
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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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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if STM32_USB_USE_USB1 || defined(__DOXYGEN__)
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/**
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* @brief USB high priority interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(USB_HP_IRQHandler) {
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CH_IRQ_PROLOGUE();
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CH_IRQ_EPILOGUE();
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}
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/**
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* @brief USB low priority interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(USB_LP_IRQHandler) {
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uint32_t istr;
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USBDriver *usbp = &USBD1;
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CH_IRQ_PROLOGUE();
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istr = STM32_USB->ISTR;
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/* USB bus reset condition handling.*/
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if (istr & ISTR_RESET) {
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_usb_reset(usbp);
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if (usbp->usb_config->uc_event_cb)
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usbp->usb_config->uc_event_cb(usbp, USB_EVENT_RESET);
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STM32_USB->ISTR = ~ISTR_RESET;
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}
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/* SOF handling.*/
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if (istr & ISTR_SOF) {
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if (usbp->usb_config->uc_sof_cb)
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usbp->usb_config->uc_sof_cb(usbp);
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STM32_USB->ISTR = ~ISTR_SOF;
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}
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/* Endpoint events handling.*/
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while (istr & ISTR_CTR) {
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uint32_t ep;
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uint32_t epr = STM32_USB->EPR[ep = istr & ISTR_EP_ID_MASK];
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if (epr & EPR_CTR_TX) {
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/* IN endpoint, transmission.*/
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EPR_CLEAR_CTR_TX(ep);
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if (usbp->usb_epc[ep]->uepc_in_cb)
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usbp->usb_epc[ep]->uepc_in_cb(usbp, ep);
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}
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if (epr & EPR_CTR_RX) {
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/* OUT endpoint, receive.*/
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EPR_CLEAR_CTR_RX(ep);
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if (usbp->usb_epc[ep]->uepc_out_cb)
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usbp->usb_epc[ep]->uepc_out_cb(usbp, ep);
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}
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istr = STM32_USB->ISTR;
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}
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CH_IRQ_EPILOGUE();
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}
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#endif
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level USB driver initialization.
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*
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* @notapi
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*/
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void usb_lld_init(void) {
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/* USB reset, ensures reset state in order to avoid trouble with JTAGs.*/
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RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
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RCC->APB1RSTR = 0;
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/* Driver initialization.*/
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usbObjectInit(&USBD1);
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}
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/**
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* @brief Configures and activates the USB peripheral.
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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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* @notapi
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*/
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void usb_lld_start(USBDriver *usbp) {
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if (usbp->usb_state == USB_STOP) {
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/* Clock activation.*/
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#if STM32_USB_USE_USB1
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if (&USBD1 == usbp) {
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/* USB clock enabled.*/
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RCC->APB1ENR |= RCC_APB1ENR_USBEN;
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/* Powers up the transceiver while holding the USB in reset state.*/
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STM32_USB->CNTR = CNTR_FRES;
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/* Enabling the USB IRQ vectors, this also gives enough time to allow
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the transceiver power up (1uS).*/
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NVICEnableVector(USB_HP_CAN1_TX_IRQn,
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CORTEX_PRIORITY_MASK(STM32_USB_USB1_HP_IRQ_PRIORITY));
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NVICEnableVector(USB_LP_CAN1_RX0_IRQn,
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CORTEX_PRIORITY_MASK(STM32_USB_USB1_LP_IRQ_PRIORITY));
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/* Reset procedure enforced on driver start.*/
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_usb_reset(&USBD1);
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}
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#endif
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}
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/* Configuration.*/
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}
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/**
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* @brief Deactivates the USB peripheral.
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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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* @notapi
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*/
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void usb_lld_stop(USBDriver *usbp) {
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/* If in ready state then disables the USB clock.*/
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if (usbp->usb_state == USB_STOP) {
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#if STM32_ADC_USE_ADC1
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if (&USBD1 == usbp) {
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NVICDisableVector(USB_HP_CAN1_TX_IRQn);
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NVICDisableVector(USB_LP_CAN1_RX0_IRQn);
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RCC->APB1ENR &= ~RCC_APB1ENR_USBEN;
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}
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#endif
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}
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}
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/**
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* @brief USB low level reset routine.
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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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* @notapi
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*/
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void usb_lld_reset(USBDriver *usbp) {
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uint32_t cntr;
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/* Powers up the transceiver while holding the USB in reset state.*/
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STM32_USB->CNTR = CNTR_FRES;
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/* Releases the USB reset, BTABLE is reset to zero.*/
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STM32_USB->CNTR = 0;
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STM32_USB->ISTR = 0;
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STM32_USB->DADDR = DADDR_EF;
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cntr = /*CNTR_ESOFM | */ CNTR_RESETM | /*CNTR_SUSPM |*/
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/*CNTR_WKUPM | CNTR_ERRM | CNTR_PMAOVRM |*/ CNTR_CTRM;
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/* The SOF interrupt is only enabled if a callback is defined for
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this service because it is an high rate source.*/
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if (usbp->usb_config->uc_sof_cb != NULL)
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cntr |= CNTR_SOFM;
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STM32_USB->CNTR = cntr;
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}
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/**
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* @brief Sets the USB address.
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*
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* @param[in] usbp pointer to the @p USBDriver object
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* @param[in] addr the USB address
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*
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* @notapi
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*/
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void usb_lld_set_address(USBDriver *usbp, uint8_t addr) {
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STM32_USB->DADDR = (uint32_t)addr | DADDR_EF;
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}
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/**
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* @brief Enables an 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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* @param[in] epcp the endpoint configuration
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*
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* @notapi
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*/
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void usb_lld_enable_endpoint(USBDriver *usbp, usbep_t ep,
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const USBEndpointConfig *epcp) {
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uint16_t nblocks;
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stm32_usb_descriptor_t *dp;
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/* EPxR register setup.*/
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EPR_SET(ep, epcp->uepc_epr | ep);
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EPR_TOGGLE(ep, epcp->uepc_epr);
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/* Endpoint size and address initialization.*/
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if (epcp->uepc_out_maxsize > 62)
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nblocks = (((((epcp->uepc_out_maxsize - 1) | 0x1f) + 1) / 32) << 10) | 0x8000;
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else
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nblocks = ((((epcp->uepc_out_maxsize - 1) | 1) + 1) / 2) << 10;
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dp = USB_GET_DESCRIPTOR(ep);
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dp->TXCOUNT = 0;
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dp->RXCOUNT = nblocks;
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dp->TXADDR = epcp->uepc_inaddr;
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dp->RXADDR = epcp->uepc_outaddr;
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/* Logically enabling the endpoint in the USBDriver structure.*/
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usbp->usb_epc[ep] = epcp;
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}
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/**
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* @brief Disables all the active endpoints except the endpoint zero.
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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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* @notapi
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*/
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void usb_lld_disable_endpoints(USBDriver *usbp) {
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unsigned i;
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for (i = 1; i <= USB_ENDOPOINTS_NUMBER; i++) {
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EPR_TOGGLE(i, 0);
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EPR_SET(i, 0);
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}
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}
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/**
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* @brief Returns the number of bytes readable from the receive packet
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* buffer.
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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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* @return The number of bytes that are effectively available.
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* @retval 0 Data not yet available.
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*
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* @notapi
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*/
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size_t usb_lld_get_readable(USBDriver *usbp, usbep_t ep) {
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if ((STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) != EPR_STAT_RX_NAK)
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return 0;
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return (size_t)(USB_GET_DESCRIPTOR(ep)->RXCOUNT & RXCOUNT_COUNT_MASK);
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}
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/**
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* @brief Endpoint read.
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* @details The buffered packet is copied into the user buffer and then
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* the endpoint is brought to the valid state in order to allow
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* reception of more data.
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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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* @param[out] buf buffer where to copy the endpoint data
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* @param[in] n maximum number of bytes to copy
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* @return The number of bytes that were effectively available.
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* @retval 0 Data not yet available.
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*
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* @notapi
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*/
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size_t usb_lld_read(USBDriver *usbp, usbep_t ep, uint8_t *buf, size_t n) {
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uint32_t *pmap;
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stm32_usb_descriptor_t *udp;
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size_t count;
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if ((STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) != EPR_STAT_RX_NAK)
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return 0;
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udp = USB_GET_DESCRIPTOR(ep);
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pmap = USB_ADDR2PTR(udp->RXADDR);
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count = udp->RXCOUNT & RXCOUNT_COUNT_MASK;
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if (n > count)
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n = count;
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count = (n + 1) / 2;
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while (count) {
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*(uint16_t *)buf = (uint16_t)*pmap++;
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buf += 2;
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count--;
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}
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EPR_SET_STAT_RX(ep, EPR_STAT_RX_VALID);
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return n;
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}
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/**
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* @brief Returns the number of bytes writeable to the transmit packet
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* buffer.
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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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* @return The number of bytes that can be written.
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* @retval 0 Endpoint not ready for transmission.
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*
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* @iclass
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*/
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size_t usb_lld_get_writeable(USBDriver *usbp, usbep_t ep) {
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if ((STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) != EPR_STAT_TX_NAK)
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return 0;
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return (size_t)usbp->usb_epc[ep]->uepc_in_maxsize;
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}
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/**
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* @brief Endpoint write.
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* @details The user data is copied in the packer memory and then
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* the endpoint is brought to the valid state in order to allow
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* transmission.
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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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* @param[in] buf buffer where to copy the endpoint data
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||
|
|
* @param[in] n maximum number of bytes to copy
|
||
|
|
* @return The number of bytes that were effectively written.
|
||
|
|
* @retval 0 Endpoint not ready for transmission.
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
size_t usb_lld_write(USBDriver *usbp, usbep_t ep,
|
||
|
|
const uint8_t *buf,
|
||
|
|
size_t n) {
|
||
|
|
uint32_t *pmap;
|
||
|
|
stm32_usb_descriptor_t *udp;
|
||
|
|
size_t count;
|
||
|
|
|
||
|
|
if ((STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) != EPR_STAT_TX_NAK)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
udp = USB_GET_DESCRIPTOR(ep);
|
||
|
|
pmap = USB_ADDR2PTR(udp->TXADDR);
|
||
|
|
udp->TXCOUNT = n;
|
||
|
|
count = (n + 1) / 2;
|
||
|
|
while (count) {
|
||
|
|
*pmap++ = *(uint16_t *)buf;
|
||
|
|
buf += 2;
|
||
|
|
count--;
|
||
|
|
}
|
||
|
|
EPR_SET_STAT_TX(ep, EPR_STAT_TX_VALID);
|
||
|
|
return n;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Returns the status of an IN endpoint.
|
||
|
|
*
|
||
|
|
* @param[in] usbp pointer to the @p USBDriver object
|
||
|
|
* @param[in] ep endpoint number
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
usbepstatus_t usb_lld_get_status_in(USBDriver *usbp, usbep_t ep) {
|
||
|
|
|
||
|
|
switch (STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) {
|
||
|
|
case EPR_STAT_TX_DIS:
|
||
|
|
return EP_STATUS_DISABLED;
|
||
|
|
case EPR_STAT_TX_STALL:
|
||
|
|
return EP_STATUS_STALLED;
|
||
|
|
default:
|
||
|
|
return EP_STATUS_ACTIVE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Returns the status of an OUT endpoint.
|
||
|
|
*
|
||
|
|
* @param[in] usbp pointer to the @p USBDriver object
|
||
|
|
* @param[in] ep endpoint number
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
usbepstatus_t usb_lld_get_status_out(USBDriver *usbp, usbep_t ep) {
|
||
|
|
|
||
|
|
switch (STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) {
|
||
|
|
case EPR_STAT_RX_DIS:
|
||
|
|
return EP_STATUS_DISABLED;
|
||
|
|
case EPR_STAT_RX_STALL:
|
||
|
|
return EP_STATUS_STALLED;
|
||
|
|
default:
|
||
|
|
return EP_STATUS_ACTIVE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Brings an IN endpoint in the stalled state.
|
||
|
|
*
|
||
|
|
* @param[in] usbp pointer to the @p USBDriver object
|
||
|
|
* @param[in] ep endpoint number
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
void usb_lld_stall_in(USBDriver *usbp, usbep_t ep) {
|
||
|
|
|
||
|
|
EPR_SET_STAT_TX(ep, EPR_STAT_TX_STALL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Brings an OUT endpoint in the stalled state.
|
||
|
|
*
|
||
|
|
* @param[in] usbp pointer to the @p USBDriver object
|
||
|
|
* @param[in] ep endpoint number
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
void usb_lld_stall_out(USBDriver *usbp, usbep_t ep) {
|
||
|
|
|
||
|
|
EPR_SET_STAT_RX(ep, EPR_STAT_RX_STALL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Brings an IN endpoint in the active state.
|
||
|
|
*
|
||
|
|
* @param[in] usbp pointer to the @p USBDriver object
|
||
|
|
* @param[in] ep endpoint number
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
void usb_lld_clear_in(USBDriver *usbp, usbep_t ep) {
|
||
|
|
|
||
|
|
/* Makes sure to not put to NAK an endpoint that is already
|
||
|
|
transferring.*/
|
||
|
|
if ((STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) != EPR_STAT_TX_VALID)
|
||
|
|
EPR_SET_STAT_TX(ep, EPR_STAT_TX_NAK);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Brings an OUT endpoint in the active state.
|
||
|
|
*
|
||
|
|
* @param[in] usbp pointer to the @p USBDriver object
|
||
|
|
* @param[in] ep endpoint number
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
void usb_lld_clear_out(USBDriver *usbp, usbep_t ep) {
|
||
|
|
|
||
|
|
/* Makes sure to not put to NAK an endpoint that is already
|
||
|
|
transferring.*/
|
||
|
|
if ((STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) != EPR_STAT_RX_VALID)
|
||
|
|
EPR_SET_STAT_TX(ep, EPR_STAT_RX_NAK);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* HAL_USE_USB */
|
||
|
|
|
||
|
|
/** @} */
|