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