tinyUSB/hw/bsp/metro_m0_express/board_metro_m0_express.c

/**************************************************************************/
/*!
 @file    board_metro_m4_express.c
 @author  hathach (tinyusb.org)

 @section LICENSE

 Software License Agreement (BSD License)

 Copyright (c) 2018, hathach (tinyusb.org)
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 1. Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 3. Neither the name of the copyright holders nor the
 names of its contributors may be used to endorse or promote products
 derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 This file is part of the tinyusb stack.
*/
/**************************************************************************/

#include "bsp/board.h"

#include "sam.h"
#include "hal/include/hal_gpio.h"
#include "hal/include/hal_init.h"
#include "hri/hri_nvmctrl_d21.h"

#include "hpl/gclk/hpl_gclk_base.h"
#include "hpl_pm_config.h"
#include "hpl/pm/hpl_pm_base.h"

#include "tusb_option.h"

//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM DECLARATION
//--------------------------------------------------------------------+
#define LED_PIN      17

/* Referenced GCLKs, should be initialized firstly */
#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)

/* Not referenced GCLKs, initialized last */
#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)

void board_init(void)
{
  // Clock init ( follow hpl_init.c )
  hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);

  _pm_init();
  _sysctrl_init_sources();
#if _GCLK_INIT_1ST
  _gclk_init_generators_by_fref(_GCLK_INIT_1ST);
#endif
  _sysctrl_init_referenced_generators();
  _gclk_init_generators_by_fref(_GCLK_INIT_LAST);

  // Led init
  gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
  gpio_set_pin_level(LED_PIN, 0);

#if CFG_TUSB_OS  == OPT_OS_NONE
  // Tick init, samd SystemCoreClock may not correct
  SysTick_Config(CONF_CPU_FREQUENCY/1000);
#endif

  /* USB Clock init
   * The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
   * for low speed and full speed operation. */
  _pm_enable_bus_clock(PM_BUS_APBB, USB);
  _pm_enable_bus_clock(PM_BUS_AHB, USB);
  _gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);

  // USB Pin Init
  gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
  gpio_set_pin_level(PIN_PA24, false);
  gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
  gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
  gpio_set_pin_level(PIN_PA25, false);
  gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);

  gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
  gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);

  // Output 500hz PWM on D12 (PA19 - TCC0 WO[3]) so we can validate the GCLK0 clock speed with a Saleae.
  _pm_enable_bus_clock(PM_BUS_APBC, TCC0);
  TCC0->PER.bit.PER = 48000000 / 1000;
  TCC0->CC[3].bit.CC = 48000000 / 2000;
  TCC0->CTRLA.bit.ENABLE = true;

  gpio_set_pin_function(PIN_PA19, PINMUX_PA19F_TCC0_WO3);
  _gclk_enable_channel(TCC0_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
}

void board_led_control(bool state)
{
  gpio_set_pin_level(LED_PIN, state);
}


/*------------------------------------------------------------------*/
/* TUSB HAL MILLISECOND
 *------------------------------------------------------------------*/
#if CFG_TUSB_OS  == OPT_OS_NONE
volatile uint32_t system_ticks = 0;

void SysTick_Handler (void)
{
  system_ticks++;
}

uint32_t tusb_hal_millis(void)
{
  return board_tick2ms(system_ticks);
}
#endif