【经验】如何实现基于瑞萨32位MCU RA6T2的I²C+DTC？

如何实现基于瑞萨32位MCU RA6T2的I²C+DTC？本文为你介绍。首先，在e2studio上新建一个工程，打开smart config，进行配置。步骤如下：

（1）

（2）

上图中， slave address跟你板子上的外接i²c器件有关系，本案列外接的是BL24C128。

(3)

如上，DTC的设置，smart config已经自动帮你设置好，不需要修改。

（4）

按上述步骤设置好后，电机，generate  project content生成代码。

在hal_entry中添加如下代码，

void g_iic_b_master0_callback(i2c_master_callback_args_t *p_args)

{

    if (NULL != p_args)

    {

        i2c_event = p_args->event;

    }

}

fsp_err_t validate_i2c_event(void)

{

    uint16_t local_time_out = UINT16_MAX;

    /* resetting call back event capture variable */

    i2c_event = (i2c_master_event_t)RESET_VALUE;

    do

    {

        /* This is to avoid infinite loop */

        --local_time_out;

        if(RESET_VALUE == local_time_out)

        {

            return FSP_ERR_TRANSFER_ABORTED;

        }

    }while(i2c_event == RESET_VALUE);

    if(i2c_event != I2C_MASTER_EVENT_ABORTED)

    {

        i2c_event = (i2c_master_event_t)RESET_VALUE;  // Make sure this is always Reset before return

        return FSP_SUCCESS;

    }

    i2c_event = (i2c_master_event_t)RESET_VALUE; // Make sure this is always Reset before return

    return FSP_ERR_TRANSFER_ABORTED;

}

/*******************************************************************************************************************//**

 * main() is generated by the RA Configuration editor and is used to generate threads if an RTOS is used.  This function

 * is called by main() when no RTOS is used.

 **********************************************************************************************************************/

//uint8_t write_buffer[9] = {0x00,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06};//写数据

uint8_t write_buffer[66]={0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64};

void hal_entry(void)

{

    int err_read = 0;

    /* TODO: add your own code here */

    fsp_err_t err;

    err = R_IIC_B_MASTER_Open (&g_i2c_master0_ctrl, &g_i2c_master0_cfg);

    if(err)

    {

       err_read = 0;

    }

    R_DTC_Open (&g_transfer0_ctrl, &g_transfer0_cfg);

    R_DTC_Enable (&g_transfer0_ctrl);

    R_DTC_Open (&g_transfer1_ctrl, &g_transfer1_cfg);

    R_DTC_Enable (&g_transfer1_ctrl);

    err = R_IIC_B_MASTER_Write (&g_i2c_master0_ctrl, write_buffer, 66, false);

    while(1)

    {

       //写

       //读

       R_BSP_SoftwareDelay(15, 1000);

       uint8_t read_buffer_ID[2] ={0x00,0x00};

       err = R_IIC_B_MASTER_Write (&g_i2c_master0_ctrl, read_buffer_ID, 2, true);

       if(err)

       {

          err_read = 0;

       }

       err = validate_i2c_event();

       R_BSP_SoftwareDelay(1, 1000);

       uint8_t read_buffer[64] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

       err = R_IIC_B_MASTER_Read(&g_i2c_master0_ctrl,read_buffer,64,false);

       err = validate_i2c_event();

       if(err)

       {

          err_read = 0;

       }

       R_BSP_SoftwareDelay(500, 1000);

    }

#if BSP_TZ_SECURE_BUILD

    /* Enter non-secure code */

    R_BSP_NonSecureEnter();

#endif

}

就可以实现i²c的读写。