1.1.3.3 Configuring The Library

Memory Driver Library should be configured via MHC. The following figures show the MHC configuration window for Memory Driver and brief description.

Common User Configuration for all Instances

drv_memory_mhc_config_async_common

  • Driver Mode:

    • Allows User to select the mode of driver(Asynchronous or Synchronous). This setting is common for all the instances.

Instance Specific User Configurations

Asynchronous Mode with RTOS and File System

drv_memory_mhc_config_async_rtos_fs

Synchronous Mode with RTOS and Without File System

drv_memory_mhc_config_sync_rtos

  • Number Of Clients:

    • Specifies number of clients to access the specific instance of the driver

  • File System Enabled For Memory Driver:

    • Specifies if File system service is connected to the instance of Memory Driver

  • Buffer Queue Size:

    • Specifies maximum number of requests to be buffered in queue

    • This Configuration is displayed only in Asynchronous mode

  • Memory Device Type:

    • Specifies the type of the memory device to be used when the File system is connected to this instance

  • Memory Device Used:

    • Specifies the Media device connected

  • Memory Device Status Polling Rate Microseconds:

    • Specifies the interval to poll for the transfer status

    • Option is displayed only in Synchronous mode and when Memory device used does not support interrupt mode

  • RTOS Settings:

    • This configuration is displayed only in asynchronous mode

    • Stack Size (in bytes):

      • Specifies the number of bytes to be allocated on the stack for the Memory driver task of the instance

    • Task Priority:

      • Specifies priority for the Memory driver task thread. The value can vary based on RTOS used

    • Use Task Delay?

      • When enabled the Memory driver task will be scheduled out voluntarily after every run based on the delay configured.

      • Task Delay:

        • Specifies the duration the task has to go to sleep after every run.

        • Should be configured carefully based on the application need and number of task running along in the system

RTOS Settings For MicriumOS-III RTOS

Below additional options are visible in drivers instance RTOS settings when the MicriumOS-III is added into project graph

rtos_settings_micrium_os_iii

  • Maximum Message Queue Size:

    • This argument specifies the maximum number of messages that the task can receive through internal message queue.

      • A MicriumOS-III task contains an optional internal message queue (if OS_CFG_TASK_Q_EN is set to DEF_ENABLED in os_cfg.h).

    • The user may specify that the task is unable to receive messages by setting this argument to 0

  • Task Time Quanta:

    • The amount of time (in clock ticks) for the time quanta when Round Robin is enabled.

    • If you specify 0, then the default time quanta will be used which is the tick rate divided by 10.

  • Task Specific Options:

    • Contains task-specific options. Each option consists of one bit. The option is selected when the bit is set.

    • The current version of MicriumOS-III supports the following options:

      • Stack checking is allowed for the task:

        • Specifies whether stack checking is allowed for the task

      • Stack needs to be cleared:

        • Specifies whether the stack needs to be cleared

      • Floating-point registers needs to be saved:

        • Specifies whether floating-point registers are saved.

        • This option is only valid if the processor has floating-point hardware and the processor-specific code saves the floating-point registers

      • TLS (Thread Local Storage) support needed for the task:

        • If the caller doesn�t want or need TLS (Thread Local Storage) support for the task being created.

        • If you do not include this option, TLS will be supported by default. TLS support was added in V3.03.00