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- /** @addtogroup usb_file USB peripheral API
- * @ingroup peripheral_apis
- *
- * @brief USB Peripheral for Happy Gecko
- *
- * The Happy Gecko uses the "standard" usb_dwc_otg core.
- *
- * @sa usb_defines
- * @copyright See @ref lgpl_license
- */
- /*
- * This file is part of the libopencm3 project.
- *
- * Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
- * Copyright (C) 2018 Seb Holzapfel <schnommus@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 <string.h>
- #include <libopencm3/cm3/common.h>
- #include <libopencm3/efm32/memorymap.h>
- #include <libopencm3/efm32/cmu.h>
- #include <libopencm3/efm32/usb.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 256
-
- /* FIXME: EFM32HG has 6 bidirectional endpoints.
- * problem is "uint32_t doeptsiz[4];" in usb_private.h */
-
- #define ENDPOINT_COUNT 4
-
- static struct _usbd_device _usbd_dev;
-
- /** Initialize the USB device controller hardware of the EFM32HG. */
- static usbd_device *efm32hg_usbd_init(void)
- {
- /* Enable peripheral clocks required for USB */
- cmu_periph_clock_enable(CMU_USB);
- cmu_periph_clock_enable(CMU_USBC);
- cmu_periph_clock_enable(CMU_LE);
-
- /* Select LFRCO as LFCCLK clock */
- CMU_LFCLKSEL = CMU_LFCLKSEL_LFC_LFRCO;
-
- /* Enable the USBLE peripheral clock (sits on LFCCLK) */
- cmu_periph_clock_enable(CMU_USBLE);
-
- /* Calibrate USB based on communications */
- CMU_USHFRCOCONF = CMU_USHFRCOCONF_BAND_48MHZ;
-
- /* Enable USHFRCO Clock Recovery mode. */
- CMU_USBCRCTRL |= CMU_USBCRCTRL_EN;
-
- /* Select USHFRCO as clock source for USB */
- cmu_osc_on(USHFRCO);
- cmu_wait_for_osc_ready(USHFRCO);
-
- /* Set up the USB clock source */
- cmu_set_usbclk_source(USHFRCO);
- cmu_wait_for_usbclk_selected(USHFRCO);
-
- /* Turn off all Low Energy Mode (LEM) features. */
- USB_CTRL = 0;
-
- /* Initialize USB core */
- USB_ROUTE = USB_ROUTE_PHYPEN; /* Enable PHY pins. */
-
- /* 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);
-
- /* 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 = efm32hg_usb_driver.rx_fifo_size;
- _usbd_dev.fifo_mem_top = efm32hg_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;
- }
-
- const struct _usbd_driver efm32hg_usb_driver = {
- .init = efm32hg_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,
- };
-
- /**@}*/
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