main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code for the Interrupt NMI Timing Protection
*              example for ModusToolbox.
*
* Related Document: See README.md
*
*
*******************************************************************************
* Copyright 2024-2025, 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
* significant property damage, injury or death ("High Risk Product"). By
* including Cypress's product in a High Risk Product, the manufacturer
* of such system or application assumes all risk of such use and in doing
* so agrees to indemnify Cypress against all liability.
*******************************************************************************/

/******************************************************************************
* Include header files
*******************************************************************************/
#include "cy_pdl.h"
#include "cybsp.h"
#include "cy_retarget_io.h"
#include "cy_tcpwm.h"
#include "mtb_hal.h"

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

/* A flag when true indicating that the user process has finished within the time limit */
bool g_taskDone;

/* TCPWM interrupt configuration structure 0 */
const cy_stc_sysint_t IRQ_CFG_0 =
{
    .intrSrc = ((NvicMux4_IRQn << 16) | tcpwm_0_interrupts_0_IRQn),
    .intrPriority = 3UL
};

/* TCPWM interrupt configuration structure 1 */
const cy_stc_sysint_t IRQ_CFG_1 =
{
    .intrSrc = ((NvicMux5_IRQn << 16) | tcpwm_0_interrupts_1_IRQn),
    .intrPriority = 0UL
};

/* For the Retarget -IO (Debug UART) usage */
static cy_stc_scb_uart_context_t    UART_context;           /** UART context */
static mtb_hal_uart_t               UART_hal_obj;           /** Debug UART HAL object  */

/******************************************************************************
 * Function Name: start_TCPWM_Counter
 * Summary:
 *  This function starts timer after setting counter value to zero.
 * Parameters:
 *  none
 * Return:
 *  none
*******************************************************************************/
static void start_TCPWM_Counter(TCPWM_Type *base, uint32_t cntNum)
{
    Cy_TCPWM_Counter_SetCounter(base, cntNum, 0);
    Cy_TCPWM_TriggerStart_Single(base, cntNum);
}

/******************************************************************************
 * Function Name: handle_TCPWM_Counter_Interrupt
 * Summary:
 *  This is the handler function for counter interrupt.
 * Parameters:
 *  none
 * Return:
 *  none
*******************************************************************************/
static void handle_TCPWM_Counter_Interrupt(void)
{
     uint32 portReadValue = 0ul;

    if (Cy_TCPWM_GetInterruptStatusMasked(COUNTER_1S_HW, COUNTER_1S_NUM) != 0)
    {
        /* Start TCPWM for Timing Protection NMI */
        start_TCPWM_Counter(COUNTER_2S_HW, COUNTER_2S_NUM);

        /* Clear TCPWM CC0 interrupt flag */
        Cy_TCPWM_ClearInterrupt(COUNTER_1S_HW, COUNTER_1S_NUM, CY_TCPWM_INT_ON_CC0);

        /* user program here.. */
        {
            ;
        }

        /* Indicates that a task has been started whose duration should be monitored */
        Cy_GPIO_Write(CYBSP_LED1_PORT, CYBSP_LED1_PIN, CYBSP_LED_STATE_ON);
        
        
        printf("Press USER_BTN1 within 2 seconds...\r\n");

        /* Waiting until user button pushed */
        while (1)
        {
            portReadValue = Cy_GPIO_Read(CYBSP_USER_BTN_PORT, CYBSP_USER_BTN_PIN);
            
            if(portReadValue == CYBSP_BTN_PRESSED)
            {
                /* Stop TCPWM for Timing Protection NMI */
                Cy_TCPWM_TriggerStopOrKill_Single(COUNTER_2S_HW, COUNTER_2S_NUM);

                /* Indicates that the task finished its process */
                Cy_GPIO_Write(CYBSP_LED1_PORT, CYBSP_LED1_PIN, CYBSP_LED_STATE_OFF);
                
                printf("Pressed within time limit!\r\n\n");
                g_taskDone = true;
                break;
            }
        }
    }
}

/******************************************************************************
 * Function Name: NMIException_Handler
 * Summary:
 *  This is the handler function for NMI interrupt.
 *  This function overrides Default_NMIException_Handler, directly registered 
 *       to __Vectors.
 * Parameters:
 *  none
 * Return:
 *  none
*******************************************************************************/
void NMIException_Handler(void)
{
    if (Cy_TCPWM_GetInterruptStatusMasked(COUNTER_2S_HW, COUNTER_2S_NUM) != 0)
    {
        /* Clear TCPWM CC0 interrupt flag */
        Cy_TCPWM_ClearInterrupt(COUNTER_2S_HW, COUNTER_2S_NUM, CY_TCPWM_INT_ON_CC0);

        /* Indicates that processing time exceeds limit */
        Cy_GPIO_Write(CYBSP_LED2_PORT, CYBSP_LED2_PIN, CYBSP_LED_STATE_ON);
        
        printf("2 seconds exceeded, process terminated...\r\n");

        while (1)
        {
            ;
        }
    }
}

/******************************************************************************
 * Function Name: init_Timer
 * Summary:
 *  This function configures a 2 TCPWMs as One-shot counter.
 *  The handler of one is set as IRQ, another is set as NMI.
 * Parameters:
 *  none
 * Return:
 *  none
*******************************************************************************/
static void init_Timer(void)
{
    /* Initialize TCPWM0_GRPx_CNTx_COUNTER 0 as Counter */
    if (Cy_TCPWM_Counter_Init(COUNTER_1S_HW, COUNTER_1S_NUM, &COUNTER_1S_config) != CY_TCPWM_SUCCESS)
    {
        CY_ASSERT(0);
    }
    /* Initialize TCPWM0_GRPx_CNTx_COUNTER 1 as Counter */
    if (Cy_TCPWM_Counter_Init(COUNTER_2S_HW, COUNTER_2S_NUM, &COUNTER_2S_config) != CY_TCPWM_SUCCESS)
    {
        CY_ASSERT(0);
    }
    /* Enable TCPWM0_GRPx_CNTx_COUNTER 0 */
    Cy_TCPWM_Counter_Enable(COUNTER_1S_HW, COUNTER_1S_NUM);
    /* Enable TCPWM0_GRPx_CNTx_COUNTER 1 */
    Cy_TCPWM_Counter_Enable(COUNTER_2S_HW, COUNTER_2S_NUM);

    /* Enable Interrupt for both the counters */
    Cy_TCPWM_SetInterruptMask(COUNTER_1S_HW, COUNTER_1S_NUM, CY_TCPWM_INT_ON_CC0);
    Cy_TCPWM_SetInterruptMask(COUNTER_2S_HW, COUNTER_2S_NUM, CY_TCPWM_INT_ON_CC0);

    /* Set NMI mapping */
    Cy_SysInt_SetNmiSource(CY_SYSINT_NMI1, tcpwm_0_interrupts_1_IRQn);

    /*  Interrupt setting for TCPWMs  */
    if (Cy_SysInt_Init(&IRQ_CFG_0, handle_TCPWM_Counter_Interrupt) != CY_SYSINT_SUCCESS)
    {
        CY_ASSERT(0);
    }
    if (Cy_SysInt_Init(&IRQ_CFG_1, NMIException_Handler) != CY_SYSINT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    /* Enable the Interrupt */
    NVIC_EnableIRQ(NvicMux4_IRQn);
}

/******************************************************************************
 * Function Name: main
 * Summary:
 *  This is the main function.
 * Parameters:
 *  none
 * Return:
 *  int
*******************************************************************************/
int main(void)
{
    cy_rslt_t result;

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

    /* Enable global interrupts */
    __enable_irq();

    /* Debug UART init */
    result = (cy_rslt_t)Cy_SCB_UART_Init(UART_HW, &UART_config, &UART_context);

    /* UART init failed. Stop program execution */
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    Cy_SCB_UART_Enable(UART_HW);

    /* Setup the HAL UART */
    result = mtb_hal_uart_setup(&UART_hal_obj, &UART_hal_config, &UART_context, NULL);

    /* HAL UART init failed. Stop program execution */
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    result = cy_retarget_io_init(&UART_hal_obj);

    /* HAL retarget_io init failed. Stop program execution */
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }


    /* Initialize the User LED */
    Cy_GPIO_Pin_Init(CYBSP_LED1_PORT, CYBSP_LED1_PIN, &CYBSP_LED1_config);
                       
    Cy_GPIO_Pin_Init(CYBSP_LED2_PORT, CYBSP_LED2_PIN, &CYBSP_LED2_config);
    
    /* Initialize the User Button */
    Cy_GPIO_Pin_Init(CYBSP_USER_BTN_PORT, CYBSP_USER_BTN_PIN, &CYBSP_USER_BTN1_config);

    /* \x1b[2J\x1b[;H - ANSI ESC sequence for clear screen */
    printf("\x1b[2J\x1b[;H");

    printf("****************** "
           "Timing Protection using NMI example "
           "****************** \r\n\n");

    printf("Press USER_BTN1 within 2 seconds after USER_LED1 lights up\r\n"
           "If not pressed, USER_LED2 lights up and the process is terminated\r\n\n");

    /* Initialize TCPWM to generate interrupts */
    init_Timer();

    g_taskDone = true;

    while (1)
    {
        if (g_taskDone)
        {
            g_taskDone = false;

            /* Start timer */
            start_TCPWM_Counter(COUNTER_1S_HW, COUNTER_1S_NUM);
        }
    }
}

/* [] END OF FILE */