main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code of HPPASS CSG kill PWM example 
*              for ModusToolbox.
*
* Related Document: See README.md
*
*
*******************************************************************************
* Copyright 2024, Cypress Semiconductor Corporation (an Infineon company) or
* an affiliate of Cypress Semiconductor Corporation.  All rights reserved.
*
* This software, including source code, documentation and related
* materials ("Software") is owned by Cypress Semiconductor Corporation
* or one of its affiliates ("Cypress") and is protected by and subject to
* worldwide patent protection (United States and foreign),
* United States copyright laws and international treaty provisions.
* Therefore, you may use this Software only as provided in the license
* agreement accompanying the software package from which you
* obtained this Software ("EULA").
* If no EULA applies, Cypress hereby grants you a personal, non-exclusive,
* non-transferable license to copy, modify, and compile the Software
* source code solely for use in connection with Cypress's
* integrated circuit products.  Any reproduction, modification, translation,
* compilation, or representation of this Software except as specified
* above is prohibited without the express written permission of Cypress.
*
* Disclaimer: THIS SOFTWARE IS PROVIDED AS-IS, WITH NO WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, NONINFRINGEMENT, IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress
* reserves the right to make changes to the Software without notice. Cypress
* does not assume any liability arising out of the application or use of the
* Software or any product or circuit described in the Software. Cypress does
* not authorize its products for use in any products where a malfunction or
* failure of the Cypress product may reasonably be expected to result in
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* of such system or application assumes all risk of such use and in doing
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*******************************************************************************/

/*******************************************************************************
* Header Files
*******************************************************************************/
#include "cybsp.h"
#include "cy_pdl.h"
#include "mtb_hal.h"
#include "cy_retarget_io.h"


/*******************************************************************************
* Macros
********************************************************************************/
/* The definition of HPPASS AC startup timeout in microseconds.
 * HPPASS startup time contains AREF startup 40us, CSG startup about 15us and 
 * SAR ADC maximum self-calibration time 9ms (HPPASS input clock is 240MHz). To be
 * on the safe side, add to 10ms.
 */
#define HPPASS_AC_STARTUP_TIMEOUT           (10000U)

/*******************************************************************************
* Global Variables
********************************************************************************/
/* For the Retarget-IO (Debug UART) usage */
static cy_stc_scb_uart_context_t  DEBUG_UART_context;   /* Debug UART context */
static mtb_hal_uart_t DEBUG_UART_hal_obj;               /* Debug UART HAL object */

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


/*******************************************************************************
* Function Name: main
********************************************************************************
* Summary:
* This is the main function for CPU. The CSG DAC is periodically triggered from 
* TCPWM, and feed to CSG comparator as negative input and the positive input is
* taken from potentiometer. Depending on the operation of the CSG comparator, 
* a kill signal is generated, which in turn controls the PWM duty cycle and in 
* turn the LED brightness.
*
* Parameters:
*  void
*
* Return:
*  int
*
*******************************************************************************/
int main(void)
{
    cy_rslt_t result;

    /* Initialize the device and board peripherals */
    result = cybsp_init();
    /* Board init failed. Stop program execution */
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    /* Initialize the debug UART */
    result = Cy_SCB_UART_Init(DEBUG_UART_HW, &DEBUG_UART_config, &DEBUG_UART_context);
    /* UART init failed. Stop program execution */
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }
    Cy_SCB_UART_Enable(DEBUG_UART_HW);

    /* Setup the HAL UART */
    result = mtb_hal_uart_setup(&DEBUG_UART_hal_obj, &DEBUG_UART_hal_config, &DEBUG_UART_context, NULL);
    /* HAL UART init failed. Stop program execution */
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    /* Initialize retarget-io to use the debug UART port */
    result = cy_retarget_io_init(&DEBUG_UART_hal_obj);
    /* retarget-io init failed. Stop program execution */
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    /* Start user CSG DAC HW mode */
    Cy_HPPASS_DAC_Start(USER_CSG_SLICE_IDX, CY_HPPASS_DAC_HW);

    /* Start the HPPASS autonomous controller (AC) from state 0 */
    if(CY_HPPASS_SUCCESS != Cy_HPPASS_AC_Start(0U, HPPASS_AC_STARTUP_TIMEOUT))
    {
        CY_ASSERT(0);
    }

    /* Initialize PWM using the config structure generated using device configurator*/
    if (CY_TCPWM_SUCCESS != Cy_TCPWM_PWM_Init(USER_PWM_HW, USER_PWM_NUM, &USER_PWM_config))
    {
        CY_ASSERT(0);
    }

    /* Set the period of PWM to generate 100% duty cycle*/
    Cy_TCPWM_PWM_SetCompare0Val(USER_PWM_HW, USER_PWM_NUM, Cy_TCPWM_PWM_GetPeriod0(USER_PWM_HW, USER_PWM_NUM) + 1);

    /* Enable the initialized PWM */
    Cy_TCPWM_PWM_Enable(USER_PWM_HW, USER_PWM_NUM);

    /* \x1b[2J\x1b[;H - ANSI ESC sequence for clear screen */
    printf("\x1b[2J\x1b[;H");
    printf("********************************************************************************\r\n");
    printf("PDL: Kill PWM cycle-by-cycle using HPPASS CSG\r\n");
    printf("********************************************************************************\r\n");

    /* Enable global interrupts */
    __enable_irq();

    /* Start TCPWM */
    Cy_TCPWM_TriggerStart_Single(USER_PWM_HW, USER_PWM_NUM);

    printf("TCPWM started.\r\n\r\n");

    /* Rotate the potentiometer to change the ADC input voltage */
    printf("Rotate the potentiometer to see LED brightness changing.\r\n\r\n");

    for (;;)
    {

    }
}

/* [] END OF FILE */