main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code for the HRPWM-HRC Example
*              for ModusToolbox.
*
* Related Document: See README.md
*
*
*******************************************************************************
 *
 * $ Copyright (c) 2015-YEAR, 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"

/*******************************************************************************
* Macros
********************************************************************************/
#define CCU8_MODULE           CCU80
#define CCU8_SLICE            CCU80_CC80
#define MAX_CR1_VALUE_80MHZ   82
#define DELAY_VALUE           100000

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


/*******************************************************************************
* Function Prototypes
********************************************************************************/

/**********************************************************************************
* Funtion Name: main
***********************************************************************************
* summary:
* PWM is generated by CCU8 timer slice 0. The output of CCU8 slice 0 is fed as
* input to the HRC to place the signal in high resolution by writing the needed
* decimal value to the HRCyCR1 register using the XMC_HRPWM_HRC_SetCompare1 API.
* Placement value = CR1* 150ps
* The maximum value for this field should be set accordingly with the used module
* clock frequency: 82 for 80 MHZ, 54 for 150 MHZ, 36 for 180 MHZ
*
* Parameters:
* void
*
* Return:
* int
*
*********************************************************************************/
int main(void)
{
    cy_rslt_t result;

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

    /* Enable compare match event */
    XMC_CCU8_SLICE_SetEvent(CCU8_SLICE, XMC_CCU8_SLICE_IRQ_ID_COMPARE_MATCH_UP_CH_1);
   
    /* Connect compare match event to SR1 */
    XMC_CCU8_SLICE_SetInterruptNode(CCU8_SLICE, XMC_CCU8_SLICE_IRQ_ID_COMPARE_MATCH_UP_CH_1, XMC_CCU8_SLICE_SR_ID_1);
   
    /* Enable IRQ */
    NVIC_SetPriority(CCU80_1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 63, 0));
    NVIC_EnableIRQ(CCU80_1_IRQn);


    for (;;)
    {
    }
}

/*******************************************************************************
* Function Name: ccu80_1_IRQHandler
********************************************************************************
* Summary:
*   The interrupt is generated when the compare match event happens in ccu8
*   timer. The interrupt handler is used to place the PWM generated by ccu8 
*   timer in high resolution.
*   placement value = CR1* 150ps
*   
*Parameters:
*  void
*
* Return:
*  int
*
*******************************************************************************/

void CCU80_1_IRQHandler(void)
{
    /* HRC CR1 value */
    static uint32_t cr1_value = 0U; 
    static uint32_t counter = 0U;

    counter++;
    /*give a delay before updating cr1 value : signal placement= cr1 value*150ps*/
    if(counter > DELAY_VALUE)
    {
        counter = 0;
        cr1_value = cr1_value + 1;
        if (cr1_value > MAX_CR1_VALUE_80MHZ)
        {
            cr1_value = MAX_CR1_VALUE_80MHZ;
            /*set HRC0CR1 register with cr1_value*/
            XMC_HRPWM_HRC_SetCompare1(HRPWM0_HRC0, cr1_value);

            cr1_value = 0;
        }
        else
        {
            /*set HRC0CR1 register with cr1_value*/
            XMC_HRPWM_HRC_SetCompare1(HRPWM0_HRC0, cr1_value);
        }

        /* Trigger shadow transfer */
        XMC_CCU8_EnableShadowTransfer(CCU8_MODULE, 1U);
    }
}



/* [] END OF FILE */