main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code for the HRPWM-CSG 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_SLICE                 CCU80_CC80
#define DSVI_INITIAL_VALUE         512
#define DSV1_LOW_VALUE             140
#define DSV1_HIGH_VALUE            240
#define DELAY_VALUE                0xFFFF
#define CSG_DAC_STEP               20

/*******************************************************************************
* Global Variables
********************************************************************************/
const uint8_t pattern[] = {0U, 4U, 8U, 12U, 16U, 19U, 23U, 27U, 31U};

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

/*******************************************************************************
 * Function Name: main
 *******************************************************************************
 * Summary:
 * A triangle waveform is generated with DAC0. The DAC output is connected to the
 * comparator input(user must connect). The comparator output signal is used as 
 * start and stop signal for a CCU8 timer that generates PWM.
 *
 * 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);
    }
    
    /*place holder for initial value of DAC in csg block*/
    uint32_t dsv1_value;
    uint32_t mask=1;
    
    /*start ccu8 slice 0 to generate pwm*/
    XMC_CCU8_SLICE_StartTimer(CCU8_SLICE);
    
    /*start DAC0 to generate triangular wave*/
    XMC_HRPWM_StartDac(HRPWM0, XMC_HRPWM_CSG_RUN_BIT_DAC0);
    
    /*start comparator in CSG block*/
    XMC_HRPWM_StartComparator(HRPWM0, XMC_HRPWM_CSG_RUN_BIT_CMP0);
    
    /*load the dsv1 variable with initial value of DAC*/
    dsv1_value = DSVI_INITIAL_VALUE;

    for (;;)
    {
        /*give delay before updating DAC reference value*/    
        for(uint32_t i = 0; i < 0xFFFF; ++i);  

        /*update CSG DAC DSV1 register.*/
        dsv1_value += CSG_DAC_STEP;
    
        if(dsv1_value > DSV1_HIGH_VALUE)
        {
            dsv1_value = DSV1_LOW_VALUE;
        }
        
        /*update DAC reference value*/
        XMC_HRPWM_CSG_UpdateDACRefDSV1(HRPWM0_CSG0,dsv1_value);
    
        /*enable comparator shadow transfer*/
        XMC_HRPWM_EnableComparatorShadowTransfer(HRPWM0, mask);
    }
}


/* [] END OF FILE */