main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code for the USB MSC File System in SRAM
*              Example for ModusToolbox.
*
* Related Document: See README.md
*
*
*******************************************************************************
* Copyright 2022-2023, 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 "file_system.h"
#include "usb_comm.h"
#include <stdio.h>
#include <inttypes.h>

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

#define USER_BUTTON_INTR_PRIORITY    (3u)
#define SW_DEBOUNCE_DELAY            (25u)
#define CY_ASSERT_FAILED             (0u)

/* Debug print macro to enable UART print */
#define DEBUG_PRINT                  (0u)

/*******************************************************************************
* Function Prototypes
********************************************************************************/
static void user_btn_isr(void);

/*******************************************************************************
* Global Variables
********************************************************************************/
/* Pointer to the emulated file system */
uint8_t *emulated_memory;

/* Flag to indicate when the user button is pressed */
volatile bool button_flag = false;

/* Counter to indicate how many times the button was pressed */
uint16_t button_count = 0;

/* String to be written to the file system */
char log_message[32u];

/* User Button Interrupt Configuration */
const cy_stc_sysint_t user_button_interrupt_cfg = {
    .intrSrc = CYBSP_USER_BTN_IRQ,              /* Source of interrupt signal */
    .intrPriority = USER_BUTTON_INTR_PRIORITY   /* Interrupt priority */
};

#if DEBUG_PRINT

/* Structure for UART context */
cy_stc_scb_uart_context_t UART_context;

/* Variable used for tracking the print status */
volatile bool ENTER_LOOP = true;

/*******************************************************************************
* Function Name: check_status
********************************************************************************
* Summary:
*  Prints the error message.
*
* Parameters:
*  error_msg - message to print if any error encountered.
*  status - status obtained after evaluation.
*
* Return:
*  void
*
*******************************************************************************/
void check_status(char *message, cy_rslt_t status)
{
    char error_msg[50];

    sprintf(error_msg, "Error Code: 0x%08" PRIX32 "\n", status);

    Cy_SCB_UART_PutString(CYBSP_UART_HW, "\r\n=====================================================\r\n");
    Cy_SCB_UART_PutString(CYBSP_UART_HW, "\nFAIL: ");
    Cy_SCB_UART_PutString(CYBSP_UART_HW, message);
    Cy_SCB_UART_PutString(CYBSP_UART_HW, "\r\n");
    Cy_SCB_UART_PutString(CYBSP_UART_HW, error_msg);
    Cy_SCB_UART_PutString(CYBSP_UART_HW, "\r\n=====================================================\r\n");
}
#endif

/*******************************************************************************
* Function Name: main
********************************************************************************
* Summary:
*  This is the main function. It initializes the USB Device block
*  and enumerates as a Mass Storage Device. It links a local file system emulated in
*  the SRAM. In the main loop, it continuously checks for button presses and
*  process any USB requests.
*
* Parameters:
*  void
*
* Return:
*  int
*
*******************************************************************************/
int main(void)
{
    cy_rslt_t result;
    cy_en_sysint_status_t intr_result;

    /* Initialize the device and board peripherals */
    result = cybsp_init() ;

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

#if DEBUG_PRINT
    /* Configure and enable the UART peripheral */
    Cy_SCB_UART_Init(CYBSP_UART_HW, &CYBSP_UART_config, &UART_context);
    Cy_SCB_UART_Enable(CYBSP_UART_HW);

    /* Sequence to clear screen */
    Cy_SCB_UART_PutString(CYBSP_UART_HW, "\x1b[2J\x1b[;H");

    /* Print "USB MSC File System in SRAM" */
    Cy_SCB_UART_PutString(CYBSP_UART_HW, "****************** ");
    Cy_SCB_UART_PutString(CYBSP_UART_HW, "PMG1 MCU: USB MSC File System in SRAM");
    Cy_SCB_UART_PutString(CYBSP_UART_HW, "****************** \r\n\n");
#endif

    /* Enable global interrupts */
    __enable_irq();

    /* Initialize User Button interrupt */
    intr_result = Cy_SysInt_Init(&user_button_interrupt_cfg, &user_btn_isr);
    if (intr_result != CY_SYSINT_SUCCESS)
    {
#if DEBUG_PRINT
        check_status("API Cy_SysInt_Init failed with error code", intr_result);
#endif
        CY_ASSERT(CY_ASSERT_FAILED);
    }

    /* Enable User Button interrupt */
    NVIC_EnableIRQ(user_button_interrupt_cfg.intrSrc);

    /* Initialize the USB block */
    usb_comm_init();

    /* Initialize the file system on SRAM */
    file_system_init(&emulated_memory);

    /* Link the file system to the USB Mass Storage Device Class */
    usb_comm_link_fs(emulated_memory);

    /* Start the USB enumeration */
    usb_comm_connect();

    for(;;)
    {
        /* Process any USB requests */
        usb_comm_process();

        /* Check if the user button was pressed */
        if (button_flag)
        {
            /* Wait for 25 milliseconds for switch de-bounce*/
            Cy_SysLib_Delay(SW_DEBOUNCE_DELAY);

            /* Build the message */
            sprintf(log_message, "\r\n> Button press %d time(s)", ++button_count);

            /* Write to the file system */
            if (false == file_system_write(log_message, strlen(log_message)))
            {
                /* If failed, clear the file */
                file_system_erase_all();
            }

            /* Emulate ejection every 5 times */
            if ((button_count % 5) == 0)
            {
                usb_comm_refresh();
            }

            /* Clear flag */
            button_flag = false;
        }
#if DEBUG_PRINT
        if (ENTER_LOOP)
        {
            Cy_SCB_UART_PutString(CYBSP_UART_HW, "Entered for loop\r\n");
            ENTER_LOOP = false;
        }
#endif
    }
}

/*******************************************************************************
* Function Name: user_btn_isr
********************************************************************************
*
* Summary:
*  This function is executed when interrupt is triggered through the User button.
*
*******************************************************************************/
void user_btn_isr(void)
{

    /* Clears the triggered pin interrupt */
    Cy_GPIO_ClearInterrupt(CYBSP_USER_BTN_PORT, CYBSP_USER_BTN_NUM);
    NVIC_ClearPendingIRQ(user_button_interrupt_cfg.intrSrc);

    /* Set interrupt flag */
    button_flag = true;
}

/* [] END OF FILE */