usb_f107.c

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/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <string.h>
#include <libopencm3/cm3/common.h>
#include <libopencm3/stm32/tools.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/dwc/otg_fs.h>
#include "usb_private.h"
#include "usb_dwc_common.h"
 
/* Receive FIFO size in 32-bit words. */
#define RX_FIFO_SIZE 128
 
static usbd_device *stm32f107_usbd_init(void);
 
static struct _usbd_device usbd_dev;
 
const struct _usbd_driver stm32f107_usb_driver = {
        .init = stm32f107_usbd_init,
        .set_address = dwc_set_address,
        .ep_setup = dwc_ep_setup,
        .ep_reset = dwc_endpoints_reset,
        .ep_stall_set = dwc_ep_stall_set,
        .ep_stall_get = dwc_ep_stall_get,
        .ep_nak_set = dwc_ep_nak_set,
        .ep_write_packet = dwc_ep_write_packet,
        .ep_read_packet = dwc_ep_read_packet,
        .poll = dwc_poll,
        .disconnect = dwc_disconnect,
        .base_address = USB_OTG_FS_BASE,
        .set_address_before_status = 1,
        .rx_fifo_size = RX_FIFO_SIZE,
};
 
/** Initialize the USB device controller hardware of the STM32. */
static usbd_device *stm32f107_usbd_init(void)
{
        rcc_periph_clock_enable(RCC_OTGFS);
        OTG_FS_GUSBCFG |= OTG_GUSBCFG_PHYSEL;
 
        /* Wait for AHB idle. */
        while (!(OTG_FS_GRSTCTL & OTG_GRSTCTL_AHBIDL));
        /* Do core soft reset. */
        OTG_FS_GRSTCTL |= OTG_GRSTCTL_CSRST;
        while (OTG_FS_GRSTCTL & OTG_GRSTCTL_CSRST);
 
        if (OTG_FS_CID >= OTG_CID_HAS_VBDEN) {
                /* Enable VBUS detection in device mode and power up the PHY. */
                OTG_FS_GCCFG |= OTG_GCCFG_VBDEN | OTG_GCCFG_PWRDWN;
        } else {
                /* Enable VBUS sensing in device mode and power up the PHY. */
                OTG_FS_GCCFG |= OTG_GCCFG_VBUSBSEN | OTG_GCCFG_PWRDWN;
        }
        /* Explicitly enable DP pullup (not all cores do this by default) */
        OTG_FS_DCTL &= ~OTG_DCTL_SDIS;
 
        /* Force peripheral only mode. */
        OTG_FS_GUSBCFG |= OTG_GUSBCFG_FDMOD | OTG_GUSBCFG_TRDT_MASK;
 
        OTG_FS_GINTSTS = OTG_GINTSTS_MMIS;
 
        /* Full speed device. */
        OTG_FS_DCFG |= OTG_DCFG_DSPD;
 
        /* Restart the PHY clock. */
        OTG_FS_PCGCCTL = 0;
 
        OTG_FS_GRXFSIZ = stm32f107_usb_driver.rx_fifo_size;
        usbd_dev.fifo_mem_top = stm32f107_usb_driver.rx_fifo_size;
 
        /* Unmask interrupts for TX and RX. */
        OTG_FS_GAHBCFG |= OTG_GAHBCFG_GINT;
        OTG_FS_GINTMSK = OTG_GINTMSK_ENUMDNEM |
                         OTG_GINTMSK_RXFLVLM |
                         OTG_GINTMSK_IEPINT |
                         OTG_GINTMSK_USBSUSPM |
                         OTG_GINTMSK_WUIM;
        OTG_FS_DAINTMSK = 0xF;
        OTG_FS_DIEPMSK = OTG_DIEPMSK_XFRCM;
 
        return &usbd_dev;
}