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switch to setup for Arduino Boards Manager
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Erik Tylek Kettenburg
158
digistump-sam/system/CMSIS/Examples/cmsis_example/main.c
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158
digistump-sam/system/CMSIS/Examples/cmsis_example/main.c
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/* ----------------------------------------------------------------------------
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* SAM Software Package License
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* ----------------------------------------------------------------------------
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* Copyright (c) 2012, Atmel Corporation
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*
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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 condition is met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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/**
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* \brief CMSIS Example
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* \mainpage CMSIS Example
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*
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* \section Purpose
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*
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* The cmsis example will help new users get familiar with
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* basic cmsis utilities of SAM3 and SAM4 microcontrollers.
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*
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* The example will execute the following tests:
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* - The application will flash the LED per second. The second
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* is calculated by the standard system tick interface of cmsis.
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*
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* \section Requirements
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*
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* This package can be used with SAM3 and SAM4 evaluation kits.
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*
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* \section Description
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* The cmsis example will use the system tick of the Cortex-M.
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*
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* \section Usage
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*
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* -# Build the program and download it into the evaluation board. Please
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* refer to the
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* <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6224.pdf">
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* SAM-BA User Guide</a>, the
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* <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6310.pdf">
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* GNU-Based Software Development</a> application note or the
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* <a href="ftp://ftp.iar.se/WWWfiles/arm/Guides/EWARM_UserGuide.ENU.pdf">
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* IAR EWARM User Guide</a>, depending on the solutions that users choose.
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*
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*/
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#include "sam.h"
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#include "conf_board.h"
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__INLINE static void delay_ms(uint32_t dw_dly_ticks);
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__INLINE static void led_config(void);
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__INLINE static void led_on(uint32_t dw_led);
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__INLINE static void led_off(uint32_t dw_led);
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/* Systick Counter */
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static volatile uint32_t dw_ms_ticks = 0U;
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/**
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* \brief SysTick_Handler.
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*/
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void SysTick_Handler(void)
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{
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/* Increment counter necessary in delay(). */
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dw_ms_ticks++;
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}
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/**
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* \brief Delay number of tick Systicks (happens every 1 ms).
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*/
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__INLINE static void delay_ms(uint32_t dw_dly_ticks)
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{
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uint32_t dw_cur_ticks;
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dw_cur_ticks = dw_ms_ticks;
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while ((dw_ms_ticks - dw_cur_ticks) < dw_dly_ticks) {
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}
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}
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/**
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* \brief Configure LED pins.
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*/
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__INLINE static void led_config(void)
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{
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/* Set up LED pins. */
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LED0_PIO->PIO_PER = LED0_MASK;
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LED0_PIO->PIO_OER = LED0_MASK;
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LED0_PIO->PIO_PUDR = LED0_MASK;
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}
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/**
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* \brief Switch on LED.
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*/
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__INLINE static void led_on(uint32_t dw_led)
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{
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/* Turn On LED. */
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LED0_PIO->PIO_CODR = dw_led;
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}
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/**
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* \brief Switch off LED.
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*/
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__INLINE static void led_off(uint32_t dw_led)
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{
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/* Turn Off LED. */
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LED0_PIO->PIO_SODR = dw_led;
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}
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/**
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* \brief Application entry point.
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*
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* \return Unused (ANSI-C compatibility).
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*/
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int main(void)
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{
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/* Initilize the SAM3 system */
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SystemInit();
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WDT->WDT_MR = WDT_MR_WDDIS;
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/* Set up SysTick Timer for 1 msec interrupts. */
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if (SysTick_Config(SystemCoreClock / (uint32_t) 1000)) {
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/* Capture error. */
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while (1) {
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}
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}
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led_config();
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/* Flash the LED. */
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while (1) {
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/* Turn on the LED. */
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led_on(LED0_MASK);
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/* Delay 1000 Msec. */
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delay_ms((uint32_t) 1000);
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/* Turn off the LED. */
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led_off(LED0_MASK);
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/* Delay 1000 Msec. */
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delay_ms((uint32_t) 1000);
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}
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}
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