Micrium OS Internal tasks#
Table - Micrium OS Internal tasks in the Appendix A - Internal Tasks page lists all the internal tasks automatically created by the Micrium OS along with their default priority. It is always possible to change the task priority after the module initialization.
Changing tasks priority must be done with care. Some tasks may have special requirements. Refer to the module's section of this user manual for more information.
Note that the default stack sizes have been deliberately set to a high value. It is recommended to configure them to a more appropriate size once your application is completed.
Table - Micrium OS Internal tasks#
Task | Module | Description | Default priority | Default stack size | Change priority with… | Change stack configuration with… | Default priority define |
---|---|---|---|---|---|---|---|
Timer | Kernel | Handles timer-based operations | 5 | 256 | KERNEL_TMR_TASK_PRIO_DFLT | ||
Stat | Kernel | Maintain Kernel usage statistics | 6 | 256 | KERNEL_STAT_TASK_PRIO_DFLT | ||
Service | CANopen | Handles CAN frames for different CANopen communication objects | 9 | 512 | CANOPEN_CORE_TASK_PRIO_DFLT | ||
Hub | USB Host Core | Handles the USB Host Hub events | 10 | 768 | USBH_HUB_TASK_PRIO_DFLT | ||
Scheduler | USB Host PBHCI | Handles Pipe-Based Host Controller Interface events | 11 | 512 | USBH_PBHCI_TASK_PRIO_DFLT | ||
SD Core | IO-SD | Handles SD events (card connection, disconnection, interrupts) and data transfers | 14 | 512 | IO_SD_CORE_TASK_PRIO_DFLT | ||
Net Core | Net Core | Handles timers and packet reception & deallocation | 16 | 1024 | NET_CORE_TASK_CFG_PRIO_DFLT | ||
Net Core WiFi* | Net Core | Handles third party drivers that require it | 17 | - | NET_CORE_IF_WIFI_TASK_PRIO_DFLT | ||
HTTP_Client | HTTP Client Application | 18 | 768 | HTTP_CLIENT_TASK_PRIO_DFLT | |||
MQTT Client | MQTT Client Application | 19 | 512 | MQTT_CLIENT_TASK_PRIO_DFLT | |||
IPerf | IPerf Application | Handles test runs | 20 | 512 | IPERF_TASK_PRIO_DFLT | ||
Telnet Server | Telnet Session | Handles client's session | 21 | 512 | TELNET_SERVER_SESSION_TASK_CFG_STK_SIZE_ELEMENTS_DFLT | ||
Telnet Server | Telnet Service | Handles new client request | 22 | 256 | TELNET_SERVER_TASK_CFG_STK_SIZE_ELEMENTS_DFLT | ||
TFTP Server | TFTP Server | Handles TFTP requests | 23 | 512 | TFTP_SERVER_TASK_PRIO_DFLT | ||
Asynchronous | USB Host Core | Handles asynchronous events | 25 | 512 | USBH_ASYNC_TASK_PRIO_DFLT | ||
Asynchronous | IO-SD | Handles SD data transfers | 26 | 512 | IO_SD_ASYNC_TASK_PRIO_DFLT | ||
Media Poll | File System Storage | Handles removable media status polling | 27 | 512 | FS_MEDIA_POLL_TASK_PRIO_DFLT | ||
Net Services | Net Core | Handles network services such as DHCP | 28 | 512 | NET_CORE_SVC_TASK_CFG_PRIO_DFLT | ||
Timer | USB Device HID class | Handles timer-based HID events | 29 | 512 | USBD_HID_TMR_TASK_PRIO_DFLT |
* The Net Core WiFi Interface task may be required by some WiFi driver implementations, as is the case with the Qualcomm QCA400x. When applicable, the driver will take care of setting the stack size, and will use the task priority mentioned above. Such task configuration can be overridden by the user application and passed to the NetIF_WiFi_Add() function.