simmel-bootloader/src/usb/usb.c

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Ha Thach for Adafruit Industries
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "nrfx.h"
#include "nrfx_power.h"

#ifdef SOFTDEVICE_PRESENT
#include "nrf_sdm.h"
#include "nrf_soc.h"
#endif

#include "nrf_usbd.h"
#include "tusb.h"
#include "usb_desc.h"

#include "boards.h"

//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM DECLARATION
//--------------------------------------------------------------------+

/* tinyusb function that handles power event (detected, ready, removed)
 * We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled. */
extern void tusb_hal_nrf_power_event(uint32_t event);

//------------- IMPLEMENTATION -------------//
void usb_init(void)
{
  NVIC_SetPriority(USBD_IRQn, 2);

  // USB power may already be ready at this time -> no event generated
  // We need to invoke the handler based on the status initially
  uint32_t usb_reg;

#ifdef SOFTDEVICE_PRESENT
  uint8_t sd_en = false;
  (void) sd_softdevice_is_enabled(&sd_en);

  if ( sd_en ) {
    sd_power_usbdetected_enable(true);
    sd_power_usbpwrrdy_enable(true);
    sd_power_usbremoved_enable(true);

    sd_power_usbregstatus_get(&usb_reg);
  }else
#endif
  {
    // Power module init
    const nrfx_power_config_t pwr_cfg = { 0 };
    nrfx_power_init(&pwr_cfg);

    // Register tusb function as USB power handler
    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
    nrfx_power_usbevt_init(&config);

    nrfx_power_usbevt_enable();

    usb_reg = NRF_POWER->USBREGSTATUS;
  }

  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) {
    tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
  }

  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk ) {
    tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
  }

  usb_desc_init();

  // Init TinyUSB stack
  tusb_init();
}

void usb_teardown(void)
{
  if ( NRF_USBD->ENABLE )
  {
    // Abort all transfers

    // Disable pull up
    nrf_usbd_pullup_disable(NRF_USBD);

    // Disable Interrupt
    NVIC_DisableIRQ(USBD_IRQn);

    // disable all interrupt
    NRF_USBD->INTENCLR = NRF_USBD->INTEN;

    nrf_usbd_disable(NRF_USBD);
    sd_clock_hfclk_release();

    sd_power_usbdetected_enable(false);
    sd_power_usbpwrrdy_enable(false);
    sd_power_usbremoved_enable(false);
  }
}

//--------------------------------------------------------------------+
// tinyusb callbacks
//--------------------------------------------------------------------+
void tud_mount_cb(void)
{
  led_state(STATE_USB_MOUNTED);
}

void tud_umount_cb(void)
{
  led_state(STATE_USB_UNMOUNTED);
}