USB_END_I2C_CMD
buf[5] = USB_END_I2C_CMD;
buf[8] = USB_END_I2C_CMD;
buf[index] = USB_END_I2C_CMD;
buf[8] = USB_END_I2C_CMD;
buf[k] = USB_END_I2C_CMD;
buf[11] = USB_END_I2C_CMD;
buf[k] = USB_END_I2C_CMD;
buf[5] = USB_END_I2C_CMD;
buf[5] = USB_END_I2C_CMD;
buf[8] = USB_END_I2C_CMD;
buf[11] = USB_END_I2C_CMD;