main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code for the XMC MCU: GPIO Example for
*              ModusToolbox. This example demonstrates how to configure the GPIO
*              registers using the GPDMA peripheral.
*
* Related Document: See README.md
*
*******************************************************************************
*
* Copyright (c) 2022, 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"
#include "cy_retarget_io.h"
#include <stdio.h>

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

#ifdef CYBSP_USER_LED2_PIN
/* Data Length of the GPIO buffer */
#define DATA_SIZE 8UL

#else
/* Data Length of the GPIO buffer */
#define DATA_SIZE 2UL
#endif

/* Define macro to enable/disable printing of debug messages */
#define ENABLE_XMC_DEBUG_PRINT          (0)

/*******************************************************************************
* Variables
*******************************************************************************/

#ifdef CYBSP_USER_LED2_PIN
/* GPIO logic levels to be sent to the OMR register. This data format ensures
 * 50% duty cycle for CYBSP_USER_LED and 25% duty cycle for CYBSP_USER_LED2
 */
uint32_t gpio_data[DATA_SIZE] = {
    (XMC_GPIO_OUTPUT_LEVEL_HIGH << CYBSP_USER_LED_PIN),     /* Logic HIGH to USER_LED */
    (XMC_GPIO_OUTPUT_LEVEL_HIGH << CYBSP_USER_LED2_PIN),    /* Logic HIGH to USER_LED2 */
    (XMC_GPIO_OUTPUT_LEVEL_LOW  << CYBSP_USER_LED_PIN),     /* Logic LOW to USER_LED */
    (XMC_GPIO_OUTPUT_LEVEL_LOW  << CYBSP_USER_LED2_PIN),    /* Logic LOW to USER_LED2 */
    (XMC_GPIO_OUTPUT_LEVEL_HIGH << CYBSP_USER_LED_PIN),     /* Logic HIGH to USER_LED */
    (XMC_GPIO_OUTPUT_LEVEL_LOW  << CYBSP_USER_LED2_PIN),    /* Logic LOW to USER_LED2 */
    (XMC_GPIO_OUTPUT_LEVEL_LOW  << CYBSP_USER_LED_PIN),     /* Logic LOW to USER_LED */
    (XMC_GPIO_OUTPUT_LEVEL_LOW  << CYBSP_USER_LED2_PIN),    /* Logic LOW to USER_LED2 */
};

#else
/* GPIO logic levels to be sent to the OMR register. This data format ensures
 * 50% duty cycle for CYBSP_USER_LED.
 */
uint32_t gpio_data[DATA_SIZE] = {
    (XMC_GPIO_OUTPUT_LEVEL_HIGH << CYBSP_USER_LED_PIN),   /* Logic HIGH to USER_LED */
    (XMC_GPIO_OUTPUT_LEVEL_LOW << CYBSP_USER_LED_PIN),    /* Logic HIGH to USER_LED2 */
};
#endif

/* Source and destination address pointers */
uint32_t * src_addr_ptr = (uint32_t *) & gpio_data[0];
uint32_t * dst_addr_ptr = (uint32_t *) & (CYBSP_USER_LED_PORT->OMR);

/*******************************************************************************
* Function Name: main
********************************************************************************
* Summary:
* This is the main function. This function performs the initial setup of the
* device and initializes the GPDMA peripheral. The GPIO logic levels are
* transferred from the SRAM to the GPIO OMR register.
*
* Parameters:
*  none
*
* 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);
    }

    /* Initialize printf retarget */
    cy_retarget_io_init(CYBSP_DEBUG_UART_HW);

    #if ENABLE_XMC_DEBUG_PRINT
        printf("Initialization done\r\n");
    #endif

    /* Enable the DMA channel to initiate transfer */
    XMC_DMA_CH_Enable(DMA_HW, DMA_NUM);

    #if ENABLE_XMC_DEBUG_PRINT
        printf("The DMA channel enabled and transfer initiated\r\n");
    #endif

    while (1);
}

/* [] END OF FILE */