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+/*
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+ * The MIT License (MIT)
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+ *
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+ * Copyright (c) 2019, hathach (tinyusb.org)
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ * THE SOFTWARE.
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+ *
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+ */
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+
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+#include "sam.h"
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+#include "peripheral_clk_config.h"
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+#include "hal/include/hal_init.h"
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+#include "hpl/pmc/hpl_pmc.h"
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+#include "hal/include/hal_gpio.h"
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+
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+#include "bsp/board.h"
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+
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+//--------------------------------------------------------------------+
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+// MACRO TYPEDEF CONSTANT ENUM DECLARATION
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+//--------------------------------------------------------------------+
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+
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+#define LED_PIN GPIO(GPIO_PORTA, 6)
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+
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+#define BUTTON_PIN GPIO(GPIO_PORTA, 2)
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+#define BUTTON_STATE_ACTIVE 0
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+
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+//------------- IMPLEMENTATION -------------//
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+void board_init(void)
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+{
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+ init_mcu();
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+
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+ _pmc_enable_periph_clock(ID_PIOA);
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+
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+ /* Disable Watchdog */
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+ hri_wdt_set_MR_WDDIS_bit(WDT);
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+
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+ // LED
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+ gpio_set_pin_level(LED_PIN, false);
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+ gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
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+ gpio_set_pin_function(LED_PIN, GPIO_PIN_FUNCTION_OFF);
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+
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+ // Button
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+ gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
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+ gpio_set_pin_pull_mode(BUTTON_PIN, GPIO_PULL_UP);
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+ gpio_set_pin_function(BUTTON_PIN, GPIO_PIN_FUNCTION_OFF);
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+
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+#if CFG_TUSB_OS == OPT_OS_NONE
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+ // 1ms tick timer (samd SystemCoreClock may not correct)
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+ SysTick_Config(CONF_CPU_FREQUENCY / 1000);
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+#endif
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+}
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+
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+//--------------------------------------------------------------------+
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+// Board porting API
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+//--------------------------------------------------------------------+
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+
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+void board_led_write(bool state)
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+{
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+ gpio_set_pin_level(LED_PIN, state);
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+}
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+
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+uint32_t board_button_read(void)
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+{
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+ return BUTTON_STATE_ACTIVE == gpio_get_pin_level(BUTTON_PIN);
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+}
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+
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+int board_uart_read(uint8_t* buf, int len)
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+{
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+ (void) buf; (void) len;
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+ return 0;
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+}
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+
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+int board_uart_write(void const * buf, int len)
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+{
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+ (void) buf; (void) len;
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+ return 0;
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+}
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+
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+#if CFG_TUSB_OS == OPT_OS_NONE
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+volatile uint32_t system_ticks = 0;
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+
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+void SysTick_Handler (void)
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+{
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+ system_ticks++;
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+}
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+
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+uint32_t board_millis(void)
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+{
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+ return system_ticks;
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+}
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+#endif
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+
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+// Required by __libc_init_array in startup code if we are compiling using
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+// -nostdlib/-nostartfiles.
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+void _init(void)
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+{
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+
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+}
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