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//*****************************************************************************
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//
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//! @file itm_printf.c
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//!
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//! @brief Example that uses the ITM interface for printf.
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//!
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//! This example walks through the ASCII table (starting at character 033('!')
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//! and ending on 126('~')) and prints the character to the ARM ITM. This output
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//! can be decoded by running a terminal emulator (e.g. SEGGER J-Link SWO Viewer)
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//! and configuring the console for SWO at 1M Baud. This example works by
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//! configuring a timer and printing a new character after ever interrupt and
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//! sleeps in between timer interrupts.
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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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// Timer configurations.
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//
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//*****************************************************************************
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am_hal_ctimer_config_t g_sTimer3 =
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{
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// Don't link timers.
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0,
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// Set up Timer0A.
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(AM_HAL_CTIMER_FN_REPEAT |
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AM_HAL_CTIMER_INT_ENABLE |
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AM_HAL_CTIMER_LFRC_512HZ),
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// No configuration for Timer0B.
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0,
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};
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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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timerA0_init(void)
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{
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uint32_t ui32Period;
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//
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// Enable the LFRC.
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//
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am_hal_clkgen_osc_start(AM_HAL_CLKGEN_OSC_LFRC);
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//
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// Set up timer A0.
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//
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am_hal_ctimer_clear(0, AM_HAL_CTIMER_TIMERA);
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am_hal_ctimer_config(0, &g_sTimer3);
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//
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// With LFRC running at 512 Hz, set up a print rate of 32 Hz.
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// ui32Period = 8: ~64 Hz print rate
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// ui32Period = 16: ~32 Hz print rate
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// ui32Period = 32: ~16 Hz print rate
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//
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ui32Period = 16;
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am_hal_ctimer_period_set(0, AM_HAL_CTIMER_TIMERA, ui32Period,
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(ui32Period >> 1));
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//
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// Clear the timer Interrupt
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//
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am_hal_ctimer_int_clear(AM_HAL_CTIMER_INT_TIMERA0);
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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_ctimer_isr(void)
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{
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//
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// Clear TimerA0 Interrupt (write to clear).
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//
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am_hal_ctimer_int_clear(AM_HAL_CTIMER_INT_TIMERA0);
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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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uint32_t i;
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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 ITM/SWO output.
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//
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am_util_stdio_printf_init((am_util_stdio_print_char_t) am_bsp_itm_string_print);
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//
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// Initialize the SWO GPIO pin
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//
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am_bsp_pin_enable(ITM_SWO);
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//
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// Enable the ITM.
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//
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am_hal_itm_enable();
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//
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// Enable debug printf messages using ITM on SWO pin
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//
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am_bsp_debug_printf_enable();
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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("ITM Printf Example\n");
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//
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// Introduce the string of characters.
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//
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am_util_stdio_printf("\n\tBeginning ASCII walk through:\n");
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am_util_stdio_printf("\t");
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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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//
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// TimerA0 init.
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//
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timerA0_init();
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//
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// Enable the timer Interrupt.
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//
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am_hal_ctimer_int_enable(AM_HAL_CTIMER_INT_TIMERA0);
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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_enable(AM_HAL_INTERRUPT_CTIMER);
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am_hal_interrupt_master_enable();
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//
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// Enable the timer.
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//
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am_hal_ctimer_start(0, AM_HAL_CTIMER_TIMERA);
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//
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// Loop forever writing chars to the stimulus register.
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//
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while (1)
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{
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for (i = '!'; i <= '~'; i++)
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{
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//
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// Enable debug printf messages using ITM on SWO pin
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//
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am_bsp_debug_printf_enable();
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//
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// Walk through the ASCII table.
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//
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am_util_stdio_printf("%c", i);
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//
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// Disable debug printf messages using ITM on SWO pin
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//
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am_bsp_debug_printf_disable();
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//
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// Go to Deep Sleep to delay.
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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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// Enable debug printf messages using ITM on SWO pin
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//
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am_bsp_debug_printf_enable();
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//
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// New line.
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//
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am_util_stdio_printf("\n\t");
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//
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// Disable debug printf messages using ITM on SWO pin
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//
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am_bsp_debug_printf_disable();
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}
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}
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