text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2016 Scott Shawcroft 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 "shared-bindings/microcontroller/Pin.h"
  
  #include "atmel_start_pins.h"
  #include "hal/include/hal_gpio.h"
  
  #include "samd/pins.h"
  #include "supervisor/shared/rgb_led_status.h"
  
  #ifdef MICROPY_HW_NEOPIXEL
  bool neopixel_in_use;
  #endif
  #ifdef MICROPY_HW_APA102_MOSI
  bool apa102_sck_in_use;
  bool apa102_mosi_in_use;
  #endif
  #ifdef SPEAKER_ENABLE_PIN
  bool speaker_enable_in_use;
  #endif
  
  #define PORT_COUNT (PORT_BITS / 32 + 1)
  
  STATIC uint32_t never_reset_pins[PORT_COUNT];
  
  void reset_all_pins(void) {
      uint32_t pin_mask[PORT_COUNT] = PORT_OUT_IMPLEMENTED;
  
      // Do not full reset USB or SWD lines.
      pin_mask[0] &= ~(PORT_PA24 | PORT_PA25 | PORT_PA30 | PORT_PA31);
  
      for (uint32_t i = 0; i < PORT_COUNT; i++) {
          pin_mask[i] &= ~never_reset_pins[i];
      }
  
      gpio_set_port_direction(GPIO_PORTA, pin_mask[0] & ~MICROPY_PORT_A, GPIO_DIRECTION_OFF);
      gpio_set_port_direction(GPIO_PORTB, pin_mask[1] & ~MICROPY_PORT_B, GPIO_DIRECTION_OFF);
      #if PORT_BITS > 64
      gpio_set_port_direction(GPIO_PORTC, pin_mask[2] & ~MICROPY_PORT_C, GPIO_DIRECTION_OFF);
      #endif
      #if PORT_BITS > 96
      gpio_set_port_direction(GPIO_PORTD, pin_mask[3] & ~MICROPY_PORT_D, GPIO_DIRECTION_OFF);
      #endif
  
      // Configure SWD
      #ifdef SAMD51
      gpio_set_pin_function(PIN_PA30, MUX_PA30H_CM4_SWCLK);
      // SWDIO will be automatically switched on PA31 when a signal is input on
      // SWCLK.
      #endif
      #ifdef SAMD21
      //gpio_set_pin_function(PIN_PA30, GPIO_PIN_FUNCTION_G);
      //gpio_set_pin_direction(PIN_PA31, GPIO_DIRECTION_OUT);
      //gpio_set_pin_function(PIN_PA31, GPIO_PIN_FUNCTION_G);
      #endif
  
      #ifdef MICROPY_HW_NEOPIXEL
      neopixel_in_use = false;
      #endif
      #ifdef MICROPY_HW_APA102_MOSI
      apa102_sck_in_use = false;
      apa102_mosi_in_use = false;
      #endif
  
      // After configuring SWD because it may be shared.
      #ifdef SPEAKER_ENABLE_PIN
      speaker_enable_in_use = false;
      gpio_set_pin_function(SPEAKER_ENABLE_PIN->number, GPIO_PIN_FUNCTION_OFF);
      gpio_set_pin_direction(SPEAKER_ENABLE_PIN->number, GPIO_DIRECTION_OUT);
      gpio_set_pin_level(SPEAKER_ENABLE_PIN->number, false);
      #endif
  }
  
  void never_reset_pin_number(uint8_t pin_number) {
      never_reset_pins[GPIO_PORT(pin_number)] |= 1 << GPIO_PIN(pin_number);
  }
  
  void reset_pin_number(uint8_t pin_number) {
      never_reset_pins[GPIO_PORT(pin_number)] &= ~(1 << GPIO_PIN(pin_number));
  
      if (pin_number >= PORT_BITS) {
          return;
      }
  
      #ifdef MICROPY_HW_NEOPIXEL
      if (pin_number == MICROPY_HW_NEOPIXEL->number) {
          neopixel_in_use = false;
          rgb_led_status_init();
          return;
      }
      #endif
      #ifdef MICROPY_HW_APA102_MOSI
      if (pin_number == MICROPY_HW_APA102_MOSI->number ||
          pin_number == MICROPY_HW_APA102_SCK->number) {
          apa102_mosi_in_use = apa102_mosi_in_use && pin_number != MICROPY_HW_APA102_MOSI->number;
          apa102_sck_in_use = apa102_sck_in_use && pin_number != MICROPY_HW_APA102_SCK->number;
          if (!apa102_sck_in_use && !apa102_mosi_in_use) {
              rgb_led_status_init();
          }
          return;
      }
      #endif
  
      if (pin_number == PIN_PA30
          #ifdef SAMD51
          ) {
          gpio_set_pin_function(pin_number, GPIO_PIN_FUNCTION_H);
          #endif
          #ifdef SAMD21
          || pin_number == PIN_PA31) {
          gpio_set_pin_function(pin_number, GPIO_PIN_FUNCTION_G);
          #endif
      } else {
          gpio_set_pin_direction(pin_number, GPIO_DIRECTION_OFF);
          gpio_set_pin_function(pin_number, GPIO_PIN_FUNCTION_OFF);
      }
  
      #ifdef SPEAKER_ENABLE_PIN
      if (pin_number == SPEAKER_ENABLE_PIN->number) {
          speaker_enable_in_use = false;
          gpio_set_pin_function(pin_number, GPIO_PIN_FUNCTION_OFF);
          gpio_set_pin_direction(SPEAKER_ENABLE_PIN->number, GPIO_DIRECTION_OUT);
          gpio_set_pin_level(SPEAKER_ENABLE_PIN->number, false);
      }
      #endif
  }
  
  void claim_pin(const mcu_pin_obj_t* pin) {
      #ifdef MICROPY_HW_NEOPIXEL
      if (pin == MICROPY_HW_NEOPIXEL) {
          neopixel_in_use = true;
      }
      #endif
      #ifdef MICROPY_HW_APA102_MOSI
      if (pin == MICROPY_HW_APA102_MOSI) {
          apa102_mosi_in_use = true;
      }
      if (pin == MICROPY_HW_APA102_SCK) {
          apa102_sck_in_use = true;
      }
      #endif
  
      #ifdef SPEAKER_ENABLE_PIN
      if (pin == SPEAKER_ENABLE_PIN) {
          speaker_enable_in_use = true;
      }
      #endif
  }
  
  bool pin_number_is_free(uint8_t pin_number) {
      PortGroup *const port = &PORT->Group[(enum gpio_port)GPIO_PORT(pin_number)];
      uint8_t pin_index = GPIO_PIN(pin_number);
      volatile PORT_PINCFG_Type *state = &port->PINCFG[pin_index];
      volatile PORT_PMUX_Type *pmux = &port->PMUX[pin_index / 2];
  
      if (pin_number == PIN_PA30 || pin_number == PIN_PA31) {
          return state->bit.PMUXEN == 1 && ((pmux->reg >> (4 * pin_index % 2)) & 0xf) == 0x6;
      }
  
      return state->bit.PMUXEN == 0 && state->bit.INEN == 0 &&
             state->bit.PULLEN == 0 && (port->DIR.reg & (1 << pin_index)) == 0;
  }
  
  bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t* pin) {
      #ifdef MICROPY_HW_NEOPIXEL
      if (pin == MICROPY_HW_NEOPIXEL) {
          return !neopixel_in_use;
      }
      #endif
      #ifdef MICROPY_HW_APA102_MOSI
      if (pin == MICROPY_HW_APA102_MOSI) {
          return !apa102_mosi_in_use;
      }
      if (pin == MICROPY_HW_APA102_SCK) {
          return !apa102_sck_in_use;
      }
      #endif
  
      #ifdef SPEAKER_ENABLE_PIN
      if (pin == SPEAKER_ENABLE_PIN) {
          return !speaker_enable_in_use;
      }
      #endif
  
      return pin_number_is_free(pin->number);
  }
  