Flexcomm1 I2C configuration

[Nazmin]

Hi Team,

I have been trying to configure I2C using Flexcomm1. I am not able to establish a connection between master and slave. I am trying to execute the same example code with changes. Following are the snapshot of the changes made in the sample code (SDK_2_11_1_EVK MIMXRT685\boards\evkmimxrt685\driver_examples\i2c\polling_b2b\master). in order to shift from FC4 to FC1.

#define GDY112X_I2C_BASE            I2C1

#define I2C1_MASTER_CLOCK_FREQUENCY  CLOCK_GetFlexCommClkFreq(1U)

#define GDY112X_I2C_BAUDRATE        (100000U)

/* GDY112X address (7-bit) */

#define GDY112X_7BIT_I2C_ADDR            (0x3A)

int main(void)

{

 

/* Init Flexcomm1 as I2C */

 i2c_master_config_t masterConfig;

I2C_MasterGetDefaultConfig(&masterConfig);

/* Change the default baudrate configuration */

masterConfig.baudRate_Bps = GDY112X_I2C_BAUDRATE;

/* Initialize the I2C master peripheral */

I2C_MasterInit(GDY112X_I2C_BASE, &masterConfig, I2C1_MASTER_CLOCK_FREQUENCY);

/*This function to write and read data from master to slave/slave from master/*

void GDY1121_MinimalI2CTest(void)

{

    status_t status;

    uint8_t reg = WHO_AM_I_REG;

    uint8_t whoami = 0;

    PRINTF("Starting minimal I2C test...\r\n");

 // 1) Send register address (write)

    status = I2C_MasterStart(GDY112X_I2C_BASE, GDY112X_7BIT_I2C_ADDR, kI2C_Write);

    if (status != kStatus_Success) {

        PRINTF("Start (write) failed, status=%d\r\n", status);

        return;

    }

    status = I2C_MasterWriteBlocking(GDY112X_I2C_BASE, &reg, 1, kI2C_TransferNoStopFlag);

    if (status != kStatus_Success) {

        PRINTF("Write reg addr failed, status=%d\r\n", status);

        I2C_MasterStop(GDY112X_I2C_BASE);

        return;

    }

// 2) Restart and read 1 byte

    status = I2C_MasterRepeatedStart(GDY112X_I2C_BASE, GDY112X_7BIT_I2C_ADDR, kI2C_Read);

    if (status != kStatus_Success) {

        PRINTF("Repeated start (read) failed, status=%d\r\n", status);

        I2C_MasterStop(GDY112X_I2C_BASE);

        return;

    }

    status = I2C_MasterReadBlocking(GDY112X_I2C_BASE, &whoami, 1, kI2C_TransferDefaultFlag);

    if (status != kStatus_Success) {

        PRINTF("Read WHO_AM_I failed, status=%d\r\n", status);

        I2C_MasterStop(GDY112X_I2C_BASE);

        return;

    }

    // 3) Stop

    I2C_MasterStop(GDY112X_I2C_BASE);

    PRINTF("WHO_AM_I read success: 0x%02X\r\n", whoami);

}

/* pin_mux.c/*

void BOARD_InitPins(void)

{

/* PIO0_8 : FC1_I2C_SCL */

    const uint32_t port0_pin8_config = (/* Pin is configured as FC1_TXD_SCL_MISO_WS*/

                                        IOPCTL_PIO_FUNC1 |

                                        /* Enable pull-up / pull-down function */

                                        IOPCTL_PIO_PUPD_EN |

                                        /* Enable pull-up function */

                                        IOPCTL_PIO_PULLUP_EN |

                                        /* Enables input buffer function */

                                        IOPCTL_PIO_INBUF_EN |

                                        /* Normal mode */

                                        IOPCTL_PIO_SLEW_RATE_NORMAL |

/* Normal drive */

                                        IOPCTL_PIO_FULLDRIVE_DI |

                                        /* Analog mux is disabled */

                                        IOPCTL_PIO_ANAMUX_DI |

                                        /* Pseudo Output Drain is disabled */

                                        IOPCTL_PIO_PSEDRAIN_DI |

                                        /* Input function is not inverted */

                                        IOPCTL_PIO_INV_DI);

    IOPCTL_PinMuxSet(IOPCTL, 0U, 8U, port0_pin8_config);

/* PIO0_9 : FC1_I2C_SDA */

    const uint32_t port0_pin9_config = (/* Pin is configured as FC1_RXD_SDA_MOSI_DATA */

                                        IOPCTL_PIO_FUNC1 |

                                        /* Enable pull-up / pull-down function */

                                        IOPCTL_PIO_PUPD_EN |

                                        /* Enable pull-up function */

                                        IOPCTL_PIO_PULLUP_EN |

                                        /* Enables input buffer function */

                                        IOPCTL_PIO_INBUF_EN |

/* Normal mode */

                                        IOPCTL_PIO_SLEW_RATE_NORMAL |

                                        /* Normal drive */

                                        IOPCTL_PIO_FULLDRIVE_DI |

                                        /* Analog mux is disabled */

                                        IOPCTL_PIO_ANAMUX_DI |

                                        /* Pseudo Output Drain is disabled */

                                        IOPCTL_PIO_PSEDRAIN_DI |

                                        /* Input function is not inverted */

                                        IOPCTL_PIO_INV_DI);

    IOPCTL_PinMuxSet(IOPCTL, 0U, 9U, port0_pin9_config);

}

After run, the system hang in function I2C_MasterTransferBlocking(). Please advise

[Nazmin]

Hi @Pablo_Ramos , this issue solved in ticket Case: 00737268.

Thanks

[Pablo_Ramos]

Hi Nazmin,

Could you help me with the following questions?

Do you see any outputs through the I2C pins? If you do, could you share a snippet?

In which instance does I2C_MasterTransferBlocking hang?

If you use the example without any changes, does it work?

Best Regards,

Pablo