Problem using I2C on mangOH Yellow

mangOH Yellow
1

Hello,

I am using the I2C Motor Driver from Grove and I am experiencing issues while I try to write data.
I am using this function:

int I2C_write_bytes(uint8_t addr, uint8_t reg, uint8_t length, uint8_t *data)
{
    int res = 0;
    int i2c_fd = open(I2C_BUS_DEV_PATH, O_RDWR);
    
    /*******************************CHECK******************************/
    if (i2c_fd < 0)
    {
        LE_ERROR("I2C_write_bytes() failed to open %s | Error: %m\n", I2C_BUS_DEV_PATH);
        close(i2c_fd);
        return -1;
    }
    /******************************************************************/
    
    LE_INFO("I2C_write_bytes() succeed to open %s\n", I2C_BUS_DEV_PATH);
    
    /*******************************CHECK******************************/
    if (ioctl(i2c_fd, I2C_SLAVE_FORCE, addr) < 0)
    {
        LE_ERROR("I2C_write_bytes() could not set address to 0x%02x: %m", addr);
        close(i2c_fd);
        return -1;
    }
    /******************************************************************/
    
    LE_INFO("I2C_write_byte() succeed to set address 0x%02X\n", addr);
    
    res = i2c_smbus_write_i2c_block_data(i2c_fd, reg, length, data);
    
    /*******************************CHECK******************************/
    if (res < 0)
    {
		LE_ERROR("I2C_write_bytes() failed to write | Error: %m\n");
    }
    else
    {
		LE_INFO("I2C_write_bytes() succeed to write\n");
    }
    /******************************************************************/
    
    close(i2c_fd);
    return res;
}

I can open the i2c-5 file and send the ioctl command but when I am writing I get this error:

Transport endpoint is not connected

I don’t really know why this isn’t working because I used this function before and the operation to write was successful:

int i2c_hub_select_port(uint8_t hub_address, uint8_t port)
{
    int res = 0;
    int i2c_fd = open(I2C_BUS_DEV_PATH, O_RDWR);
    
    /*******************************CHECK******************************/
    if (i2c_fd < 0)
    {
        LE_ERROR("i2c_hub_select_port() failed to open %s | Error: %m\n", I2C_BUS_DEV_PATH);
        close(i2c_fd);
        return -1;
    }
    /******************************************************************/
    
    LE_INFO("i2c_hub_select_port() succeed to open %s\n", I2C_BUS_DEV_PATH);
    
    /*******************************CHECK******************************/
    if (ioctl(i2c_fd, I2C_SLAVE_FORCE, hub_address) < 0)
    {
        LE_ERROR("i2c_hub_select_port() could not set address to 0x%02X | Error: %m\n", hub_address);
        close(i2c_fd);
        return -1;
    }
    /******************************************************************/
    
    LE_INFO("i2c_hub_select_port() succeed to set address 0x%02X\n", hub_address);
    
    int writeResult = i2c_smbus_write_byte(i2c_fd, port);
    
    /*******************************CHECK******************************/
    if (writeResult < 0)
    {
        LE_ERROR("i2c_hub_select_port() failed to write | Error: %m\n");
        res = -1;
    }
    else
    {
        LE_INFO("i2c_hub_select_port() succeed to write 0x%02X\n", port);
        res = 0;        
    }
    /******************************************************************/
    
    close(i2c_fd);
    return res;
}

Here is the i2cdetect:

root@swi-mdm9x28-wp:~# i2cdetect -y -r 5
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- 04 05 06 07 -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- UU -- -- -- -- -- --

Can you help me?

Thank you!