boards/evkmimx8mq/driver_examples/i2c/interrupt_b2b_transfer/master/i2c_interrupt_b2b_transfer_master.c

/*
 * Copyright (c) 2015, Freescale Semiconductor, Inc.
 * Copyright 2016-2017 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/*  Standard C Included Files */
#include <string.h>
/*  SDK Included Files */
#include "board.h"
#include "fsl_debug_console.h"
#include "fsl_i2c.h"

#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
 * Definitions
 ******************************************************************************/
#define EXAMPLE_I2C_MASTER_BASEADDR I2C2
#define I2C_MASTER_CLK_FREQ                                                                \
    CLOCK_GetPllFreq(kCLOCK_SystemPll1Ctrl) / (CLOCK_GetRootPreDivider(kCLOCK_RootI2c2)) / \
        (CLOCK_GetRootPostDivider(kCLOCK_RootI2c2)) / 5 /* SYSTEM PLL1 DIV5 */

#define I2C_MASTER_SLAVE_ADDR_7BIT 0x7EU
#define I2C_BAUDRATE               100000U
#define I2C_DATA_LENGTH            32U

/*******************************************************************************
 * Prototypes
 ******************************************************************************/

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

uint8_t g_master_txBuff[I2C_DATA_LENGTH];
uint8_t g_master_rxBuff[I2C_DATA_LENGTH];
i2c_master_handle_t g_m_handle;
volatile bool g_MasterCompletionFlag = false;

/*******************************************************************************
 * Code
 ******************************************************************************/

static void i2c_master_callback(I2C_Type *base, i2c_master_handle_t *handle, status_t status, void *userData)
{
    /* Signal transfer success when received success status. */
    if (status == kStatus_Success)
    {
        g_MasterCompletionFlag = true;
    }
}

/*!
 * @brief Main function
 */
int main(void)
{
    i2c_master_config_t masterConfig;
    uint32_t sourceClock;
    i2c_master_transfer_t masterXfer;

    /* Board specific RDC settings */
    BOARD_RdcInit();

    BOARD_InitPins();
    BOARD_BootClockRUN();
    BOARD_InitDebugConsole();
    BOARD_InitMemory();

    CLOCK_SetRootMux(kCLOCK_RootI2c2, kCLOCK_I2cRootmuxSysPll1Div5); /* Set I2C source to SysPLL1 Div5 160MHZ */
    CLOCK_SetRootDivider(kCLOCK_RootI2c2, 1U, 4U);                   /* Set root clock to 160MHZ / 4 = 40MHZ */

    PRINTF("\r\nI2C board2board interrupt example -- Master transfer.\r\n");

    /* Set up i2c master to send data to slave*/
    for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
    {
        g_master_txBuff[i] = i;
    }

    PRINTF("Master will send data :");
    for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
    {
        if (i % 8 == 0)
        {
            PRINTF("\r\n");
        }
        PRINTF("0x%2x  ", g_master_txBuff[i]);
    }
    PRINTF("\r\n\r\n");

    /*
     * masterConfig->baudRate_Bps = 100000U;
     * masterConfig->enableHighDrive = false;
     * masterConfig->enableStopHold = false;
     * masterConfig->glitchFilterWidth = 0U;
     * masterConfig->enableMaster = true;
     */
    I2C_MasterGetDefaultConfig(&masterConfig);
    masterConfig.baudRate_Bps = I2C_BAUDRATE;

    sourceClock = I2C_MASTER_CLK_FREQ;

    I2C_MasterInit(EXAMPLE_I2C_MASTER_BASEADDR, &masterConfig, sourceClock);

    memset(&g_m_handle, 0, sizeof(g_m_handle));
    memset(&masterXfer, 0, sizeof(masterXfer));

    masterXfer.slaveAddress   = I2C_MASTER_SLAVE_ADDR_7BIT;
    masterXfer.direction      = kI2C_Write;
    masterXfer.subaddress     = (uint32_t)NULL;
    masterXfer.subaddressSize = 0;
    masterXfer.data           = g_master_txBuff;
    masterXfer.dataSize       = I2C_DATA_LENGTH;
    masterXfer.flags          = kI2C_TransferDefaultFlag;

    I2C_MasterTransferCreateHandle(EXAMPLE_I2C_MASTER_BASEADDR, &g_m_handle, i2c_master_callback, NULL);
    I2C_MasterTransferNonBlocking(EXAMPLE_I2C_MASTER_BASEADDR, &g_m_handle, &masterXfer);

    /*  Wait for transfer completed. */
    while (!g_MasterCompletionFlag)
    {
    }
    g_MasterCompletionFlag = false;

    PRINTF("Receive sent data from slave :");

    masterXfer.slaveAddress   = I2C_MASTER_SLAVE_ADDR_7BIT;
    masterXfer.direction      = kI2C_Read;
    masterXfer.subaddress     = (uint32_t)NULL;
    masterXfer.subaddressSize = 0;
    masterXfer.data           = g_master_rxBuff;
    masterXfer.dataSize       = I2C_DATA_LENGTH;

    masterXfer.flags = kI2C_TransferDefaultFlag;

    I2C_MasterTransferNonBlocking(EXAMPLE_I2C_MASTER_BASEADDR, &g_m_handle, &masterXfer);

    /*  Reset master completion flag to false. */
    g_MasterCompletionFlag = false;

    /*  Wait for transfer completed. */
    while (!g_MasterCompletionFlag)
    {
    }
    g_MasterCompletionFlag = false;

    for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
    {
        if (i % 8 == 0)
        {
            PRINTF("\r\n");
        }
        PRINTF("0x%2x  ", g_master_rxBuff[i]);
    }
    PRINTF("\r\n\r\n");

    /* Transfer completed. Check the data.*/
    for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
    {
        if (g_master_rxBuff[i] != g_master_txBuff[i])
        {
            PRINTF("\r\nError occurred in the transfer ! \r\n");
            break;
        }
    }

    PRINTF("\r\nEnd of I2C example .\r\n");
    while (1)
    {
    }
}