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//*****************************************************************************
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//
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//! @file stimer.c
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//!
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//! @brief Example using a stimer with interrupts.
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//!
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//! Purpose: This example demonstrates how to setup the stimer for counting and
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//! interrupts. It toggles LED 0 to 4 every interrupt, which is set for 1 sec.
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//!
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//! Printing takes place over the ITM at 1M Baud.
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//!
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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// Copyright (c) 2020, Ambiq Micro
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// Third party software included in this distribution is subject to the
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// additional license terms as defined in the /docs/licenses directory.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 2.4.2 of the AmbiqSuite Development Package.
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//
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//*****************************************************************************
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#include "am_mcu_apollo.h"
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#include "am_bsp.h"
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#include "am_util.h"
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//*****************************************************************************
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//
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// Macro definitions
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//
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//*****************************************************************************
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#define WAKE_INTERVAL_IN_MS 1000
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#define XT_PERIOD 32768
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#define WAKE_INTERVAL XT_PERIOD * WAKE_INTERVAL_IN_MS * 1e-3
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//*****************************************************************************
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//
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// Globals
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//
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//*****************************************************************************
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static uint32_t g_ui32Count = 0;
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//*****************************************************************************
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//
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// Init function for Timer A0.
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//
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//*****************************************************************************
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void
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stimer_init(void)
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{
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//
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// Enable compare A interrupt in STIMER
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//
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am_hal_stimer_int_enable(AM_HAL_STIMER_INT_COMPAREA);
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//
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// Enable the timer interrupt in the NVIC.
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//
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NVIC_EnableIRQ(STIMER_CMPR0_IRQn);
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//
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// Configure the STIMER and run
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//
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am_hal_stimer_config(AM_HAL_STIMER_CFG_CLEAR | AM_HAL_STIMER_CFG_FREEZE);
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am_hal_stimer_compare_delta_set(0, WAKE_INTERVAL);
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am_hal_stimer_config(AM_HAL_STIMER_XTAL_32KHZ |
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AM_HAL_STIMER_CFG_COMPARE_A_ENABLE);
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}
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//*****************************************************************************
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//
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// Timer Interrupt Service Routine (ISR)
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//
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//*****************************************************************************
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void
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am_stimer_cmpr0_isr(void)
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{
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//
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// Check the timer interrupt status.
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//
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am_hal_stimer_int_clear(AM_HAL_STIMER_INT_COMPAREA);
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am_hal_stimer_compare_delta_set(0, WAKE_INTERVAL);
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#ifdef AM_BSP_NUM_LEDS
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//
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// Toggle the LED.
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//
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#if AM_BSP_NUM_LEDS > 1
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am_devices_led_array_out(am_bsp_psLEDs, AM_BSP_NUM_LEDS, 1 << (g_ui32Count % AM_BSP_NUM_LEDS));
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#else
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am_devices_led_array_out(am_bsp_psLEDs, 1, g_ui32Count & 1);
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#endif
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g_ui32Count++;
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#else
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am_util_stdio_printf("%d ", g_ui32Count & 7);
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g_ui32Count++;
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//
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// Do a linefeed after 32 prints.
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//
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if ( (g_ui32Count & 0x1F) == 0 )
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{
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am_util_stdio_printf("\n");
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}
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#endif
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}
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//*****************************************************************************
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//
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// Main function.
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//
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//*****************************************************************************
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int
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main(void)
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{
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//
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// Set the clock frequency.
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//
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am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_SYSCLK_MAX, 0);
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//
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// Set the default cache configuration
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//
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am_hal_cachectrl_config(&am_hal_cachectrl_defaults);
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am_hal_cachectrl_enable();
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//
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// Configure the board for low power operation.
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//
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am_bsp_low_power_init();
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#ifdef AM_BSP_NUM_LEDS
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//
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// Configure the pins for this board.
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//
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am_devices_led_array_init(am_bsp_psLEDs, AM_BSP_NUM_LEDS);
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#endif
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//
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// Initialize the printf interface for ITM/SWO output.
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//
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am_bsp_itm_printf_enable();
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//
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// Clear the terminal and print the banner.
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//
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am_util_stdio_terminal_clear();
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am_util_stdio_printf("STimer Example\n");
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#ifdef AM_BSP_NUM_LEDS
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am_util_stdio_printf("The STimer will wake about every 1s to walk the LEDs on the EVB.\n");
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#else
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am_util_stdio_printf("The STimer will wake about every 1s to print to SWO.\n");
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#endif
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am_util_delay_ms(10);
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//
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// STIMER init.
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//
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stimer_init();
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//
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// Enable the timer interrupt in the NVIC.
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//
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am_hal_interrupt_master_enable();
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#ifdef AM_BSP_NUM_LEDS
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//
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// We are done printing. Disable debug printf messages on ITM.
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//
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am_bsp_debug_printf_disable();
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#endif
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//
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// Sleep forever while waiting for an interrupt.
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//
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while (1)
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{
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//
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// Go to Deep Sleep.
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//
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am_hal_sysctrl_sleep(AM_HAL_SYSCTRL_SLEEP_DEEP);
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}
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}
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