main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code for the XMC MCU: RTC Alarm Example
*              for ModusToolbox.
*
* Related Document: See README.md
*
******************************************************************************
*
* Copyright (c) 2015-2022, Infineon Technologies AG
* All rights reserved.
*
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*****************************************************************************/
#include "cybsp.h"
#include "cy_utils.h"
#include "cy_retarget_io.h"
#include <stdio.h>

/*******************************************************************************
* Macros
*******************************************************************************/

/*SysTick timer frequency in Hz*/
#define TICKS_PER_SECOND                1000

/*USER LED toggle period in milliseconds*/
#define TICKS_WAIT                      500

#if (UC_FAMILY == XMC1)
#if (UC_SERIES == XMC14)
#define RTC_INTERRUPT_EVENT_IRQN        IRQ1_IRQn
#define RTC_INTERRUPT_EVENT_PRIORITY    3
#define alarm_handler                   IRQ1_Handler
#else
#define RTC_INTERRUPT_EVENT_IRQN        SCU_1_IRQn
#define RTC_INTERRUPT_EVENT_PRIORITY    3
#define alarm_handler                   SCU_1_IRQHandler
#endif
#endif

#if (UC_FAMILY == XMC4)
#define RTC_INTERRUPT_EVENT_IRQN        SCU_0_IRQn
#define RTC_INTERRUPT_EVENT_PRIORITY    63
#endif

/*******************************************************************************
* Defines
*******************************************************************************/

/* Define macro to enable/disable printing of debug messages */
#define ENABLE_XMC_DEBUG_PRINT              (0)

/*******************************************************************************
* Global Variables
*******************************************************************************/

/*Variable for keeping track of time*/
static volatile uint32_t ticks = 0;

/*Variable for keeping track of Interrupt*/
static volatile bool timer_interrupt_flag = false;

/*******************************************************************************
* Function Name: SysTick_Handler
********************************************************************************
* Summary:
* This is System tick interrupt service routine
*
* Parameters:
*  none
*
* Return:
*  none
*
*******************************************************************************/

void SysTick_Handler(void)
{
    ticks++;
    if (TICKS_WAIT == ticks)
    {
        XMC_GPIO_ToggleOutput(CYBSP_USER_LED_PORT, CYBSP_USER_LED_PIN);
        ticks = 0;
    }
}

/*******************************************************************************
* Function Name: alarm_handler
********************************************************************************
* Summary:
* This is RTC alarm interrupt service routine
*
* Parameters:
*  none
*
* Return:
*  none
*
*******************************************************************************/
void alarm_handler(void)
{
    /*Stop SysTick timer*/
    SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
    timer_interrupt_flag = true;
}

/*******************************************************************************
* Function Name: SCU_0_IRQHandler
********************************************************************************
* Summary:
* This is SCU interrupt service routine
*
* Parameters:
*  none
*
* Return:
*  none
*
*******************************************************************************/
#if (UC_FAMILY == XMC4)
void SCU_0_IRQHandler(void)
{
    XMC_SCU_IRQHandler(0);
}
#endif

/*******************************************************************************
* Function Name: main
********************************************************************************
* Summary:
* This is the main function. The RTC demo example programs the RTC Alarm for one minute.
* System Tick Interrupt continues blinking the LED on Eval Kit at approximately 2Hz.
* RTC alarm interrupt is triggered after 1 minute.
* It will stop blinking the LED on Eval Kit.
*
* Parameters:
*  none
*
* Return:
*  int
*
*******************************************************************************/

int main(void)
{
    cy_rslt_t result;
    #if ENABLE_XMC_DEBUG_PRINT
    /* Assign false to disable printing of debug messages */
    static volatile bool debug_printf = true;
    #endif

    /*Initialize the device and board peripherals*/
    result = cybsp_init();
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    /* Initialize printf retarget */
    cy_retarget_io_init(CYBSP_DEBUG_UART_HW);

    #if ENABLE_XMC_DEBUG_PRINT
    printf("Initialization done\r\n");
    #endif

    #if (UC_FAMILY == XMC4)
    /*Enable Hibernate Domain*/
    XMC_SCU_HIB_EnableHibernateDomain();
    XMC_SCU_HIB_SetRtcClockSource(XMC_SCU_HIB_RTCCLKSRC_OSI);
    XMC_SCU_INTERRUPT_SetEventHandler(XMC_SCU_INTERRUPT_EVENT_RTC_ALARM, alarm_handler);
    /*Set the Priority for Interrupt*/
    NVIC_SetPriority(RTC_INTERRUPT_EVENT_IRQN, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), RTC_INTERRUPT_EVENT_PRIORITY, 0));
    #endif

    #if (UC_FAMILY == XMC1)
    /*Set the Priority for Interrupt*/
    NVIC_SetPriority(RTC_INTERRUPT_EVENT_IRQN, RTC_INTERRUPT_EVENT_PRIORITY);
    #endif

    /*Enable the SCU Interrupt Event*/
    XMC_SCU_INTERRUPT_EnableEvent(XMC_SCU_INTERRUPT_EVENT_RTC_ALARM);

    /*Enable the Interrupt*/
    NVIC_EnableIRQ(RTC_INTERRUPT_EVENT_IRQN);

    /*System timer configuration*/
    SysTick_Config(SystemCoreClock / TICKS_PER_SECOND);

    /*Infinite loop*/
    while (1)
    {
        #if ENABLE_XMC_DEBUG_PRINT
        if(debug_printf)
        {
            /* Print message after the SysTick_Handler is triggered */
            printf("System Tick Interrupt blinks the LED for one minute\r\n");
            debug_printf = false;
        }
        #endif

        /*Check if timer elapsed (interrupt fired) and toggle the LED*/
        if (timer_interrupt_flag)
        {
            /*Clear the flag*/
            timer_interrupt_flag = false;

            /*Set to User LED state*/
            #if (UC_FAMILY == XMC1)
            XMC_GPIO_SetOutputLow(CYBSP_USER_LED_PORT, CYBSP_USER_LED_PIN);
            #endif

            #if (UC_FAMILY == XMC4)
            XMC_GPIO_SetOutputHigh(CYBSP_USER_LED_PORT, CYBSP_USER_LED_PIN);
            #endif

            #if ENABLE_XMC_DEBUG_PRINT
            /* Print message after the RTC alarm interrupt is triggered */
            printf("The RTC alarm interrupt is triggered, LED stop blinking\r\n");
            #endif
        }
    }
}

/* [] END OF FILE */