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Arduino/hardware/arduino/sam/system/CMSIS/Examples/cmsis_example/main.c
2012-03-26 16:50:47 +02:00

159 lines
4.3 KiB
C

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