st_usbfs_v2.c

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/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
 * Copyright (C) 2014 Kuldeep Singh Dhaka <kuldeepdhaka9@gmail.com>
 *
 * 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 <libopencm3/cm3/common.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/tools.h>
#include <libopencm3/stm32/st_usbfs.h>
#include <libopencm3/usb/usbd.h>
#include "../usb/usb_private.h"
#include "common/st_usbfs_core.h"
 
/** Initialize the USB device controller hardware of the STM32. */
static usbd_device *st_usbfs_v2_usbd_init(void)
{
        rcc_periph_clock_enable(RCC_USB);
        SET_REG(USB_CNTR_REG, 0);
        SET_REG(USB_BTABLE_REG, 0);
        SET_REG(USB_ISTR_REG, 0);
 
        /* Enable RESET, SUSPEND, RESUME and CTR interrupts. */
        SET_REG(USB_CNTR_REG, USB_CNTR_RESETM | USB_CNTR_CTRM |
                USB_CNTR_SUSPM | USB_CNTR_WKUPM);
        SET_REG(USB_BCDR_REG, USB_BCDR_DPPU);
        return &st_usbfs_dev;
}
 
void st_usbfs_copy_to_pm(volatile void *vPM, const void *buf, uint16_t len)
{
        /*
         * This is a bytewise copy, so it always works, even on CM0(+)
         * that don't support unaligned accesses.
         */
        const uint8_t *lbuf = buf;
        volatile uint16_t *PM = vPM;
        uint32_t i;
        for (i = 0; i < len; i += 2) {
                *PM++ = (uint16_t)lbuf[i+1] << 8 | lbuf[i];
        }
}
 
/**
 * Copy a data buffer from packet memory.
 *
 * @param buf Destination pointer for data buffer.
 * @param vPM Source pointer into packet memory.
 * @param len Number of bytes to copy.
 */
void st_usbfs_copy_from_pm(void *buf, const volatile void *vPM, uint16_t len)
{
        const volatile uint16_t *PM = vPM;
        uint8_t odd = len & 1;
        len >>= 1;
 
        if (((uintptr_t) buf) & 0x01) {
                for (; len; PM++, len--) {
                        uint16_t value = *PM;
                        *(uint8_t *) buf++ = value;
                        *(uint8_t *) buf++ = value >> 8;
                }
        } else {
                for (; len; PM++, buf += 2, len--) {
                        *(uint16_t *) buf = *PM;
                }
        }
 
        if (odd) {
                *(uint8_t *) buf = *(uint8_t *) PM;
        }
}
 
static void st_usbfs_v2_disconnect(usbd_device *usbd_dev, bool disconnected)
{
        (void)usbd_dev;
        uint16_t reg = GET_REG(USB_BCDR_REG);
        if (disconnected) {
                SET_REG(USB_BCDR_REG, reg | USB_BCDR_DPPU);
        } else {
                SET_REG(USB_BCDR_REG, reg & ~USB_BCDR_DPPU);
        }
}
 
const struct _usbd_driver st_usbfs_v2_usb_driver = {
        .init = st_usbfs_v2_usbd_init,
        .set_address = st_usbfs_set_address,
        .ep_setup = st_usbfs_ep_setup,
        .ep_reset = st_usbfs_endpoints_reset,
        .ep_stall_set = st_usbfs_ep_stall_set,
        .ep_stall_get = st_usbfs_ep_stall_get,
        .ep_nak_set = st_usbfs_ep_nak_set,
        .ep_write_packet = st_usbfs_ep_write_packet,
        .ep_read_packet = st_usbfs_ep_read_packet,
        .disconnect = st_usbfs_v2_disconnect,
        .poll = st_usbfs_poll,
};