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//*****************************************************************************
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//
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//! @file deepsleep.c
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//!
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//! @brief Example demonstrating how to enter deepsleep.
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//!
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//! This example configures the device to go into a deep sleep mode. Once in
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//! sleep mode the device has no ability to wake up. This example is merely to
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//! provide the opportunity to measure deepsleep current without interrupts
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//! interfering with the measurement.
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//!
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//! The example begins by printing out a banner annoucement message through
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//! the UART, which is then completely disabled for the remainder of execution.
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//!
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//! Text is output to the UART at 115,200 BAUD, 8 bit, no parity.
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//! Please note that text end-of-line is a newline (LF) character only.
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//! Therefore, the UART terminal must be set to simulate a CR/LF.
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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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// UART configuration settings.
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//
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//*****************************************************************************
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am_hal_uart_config_t g_sUartConfig =
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{
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.ui32BaudRate = 115200,
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.ui32DataBits = AM_HAL_UART_DATA_BITS_8,
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.bTwoStopBits = false,
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.ui32Parity = AM_HAL_UART_PARITY_NONE,
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.ui32FlowCtrl = AM_HAL_UART_FLOW_CTRL_NONE,
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};
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//*****************************************************************************
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//
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// Initialize the UART
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//
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//*****************************************************************************
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void
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uart_init(uint32_t ui32UartModule)
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{
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//
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// Make sure the UART RX and TX pins are enabled.
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//
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am_bsp_pin_enable(COM_UART_TX);
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am_bsp_pin_enable(COM_UART_RX);
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//
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// Power on the selected UART
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//
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am_hal_uart_pwrctrl_enable(ui32UartModule);
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//
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// Start the UART interface, apply the desired configuration settings, and
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// enable the FIFOs.
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//
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am_hal_uart_clock_enable(ui32UartModule);
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//
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// Disable the UART before configuring it.
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//
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am_hal_uart_disable(ui32UartModule);
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//
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// Configure the UART.
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//
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am_hal_uart_config(ui32UartModule, &g_sUartConfig);
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//
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// Enable the UART FIFO.
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//
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am_hal_uart_fifo_config(ui32UartModule, AM_HAL_UART_TX_FIFO_1_2 | AM_HAL_UART_RX_FIFO_1_2);
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//
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// Enable the UART.
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//
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am_hal_uart_enable(ui32UartModule);
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}
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//*****************************************************************************
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//
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// Disable the UART
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//
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//*****************************************************************************
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void
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uart_disable(uint32_t ui32UartModule)
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{
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//
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// Before disabling the UART, wait a little time to be sure all
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// printing has completed.
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//
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am_util_delay_ms(10);
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//
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// Disable and power down the UART.
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//
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am_hal_uart_disable(ui32UartModule);
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am_hal_uart_pwrctrl_disable(ui32UartModule);
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//
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// Turn off UART clock.
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// Note - this is automatically handled in hardware on Apollo2.
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//
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am_hal_uart_clock_disable(ui32UartModule);
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//
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// Disable the UART pins.
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//
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am_bsp_pin_disable(COM_UART_TX);
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am_bsp_pin_disable(COM_UART_RX);
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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_sysclk_select(AM_HAL_CLKGEN_SYSCLK_MAX);
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//
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// Set the default cache configuration
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//
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am_hal_cachectrl_enable(&am_hal_cachectrl_defaults);
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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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//
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// Initialize the printf interface for UART output.
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//
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am_util_stdio_printf_init((am_util_stdio_print_char_t)am_bsp_uart_string_print);
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//
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// Initialize the UART
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//
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uart_init(AM_BSP_UART_PRINT_INST);
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//
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// Print the banner.
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//
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am_util_stdio_terminal_clear();
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am_util_stdio_printf("Deepsleep Example\n");
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//
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// To minimize power during the run, disable the UART.
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//
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uart_disable(AM_BSP_UART_PRINT_INST);
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//
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// Configure the board for low power.
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//
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am_bsp_low_power_init();
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#ifdef AM_PART_APOLLO
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//
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// Power down all SRAM banks.
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//
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am_hal_mcuctrl_sram_power_set(AM_HAL_MCUCTRL_SRAM_POWER_DOWN_ALL,
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AM_HAL_MCUCTRL_SRAM_POWER_DOWN_ALL);
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#endif // AM_PART_APOLLO
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#ifdef AM_PART_APOLLO2
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//
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// Turn OFF Flash1
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//
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AM_BFW(PWRCTRL, MEMEN, FLASH1, 0);
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while (AM_BFR(PWRCTRL, PWRONSTATUS, PD_FLAM1) != 0) {}
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//
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// Power down SRAM
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//
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AM_BFWe(PWRCTRL, SRAMPWDINSLEEP, SRAMSLEEPPOWERDOWN, ALLBUTLOWER8K);
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#endif // AM_PART_APOLLO2
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while (1)
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{
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//
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// Go to Deep Sleep and stay there.
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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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