User`s guide

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Firmware Configuration

AT85C51SND3Bx Firmware User’s Guide 6-57

7691A–MP3–08/07

Table 6-30. Power type

6.2.12 Scheduler module

The “conf_scheduler.h” file is used to configure the system scheduler.

The firmware system holds 6 tasks:

MMI manager, power management, USB, player, explorer and update.

The scheduler module of the firmware is in charge of executing each of these tasks in a

token ring manner. Tasks could be added or removed with the help of this file that maps

or not their functions.

 Task functions mapping:

The scheduler can manage up to 8 tasks. Each task should have both:

– one initialization function

– one task function

The scheduler controls the tasks by referring to them with the help of existing definition

labels implemented in the scheduler module:

– scheduler_task_?_init: definition label to associate the init function of a task to

implement

– scheduler_task_?: definition label to associate the main fuction of a task to

implement

Default task implementation:

// ***** Task init *****

#define Scheduler_task_1_init mmgr_task_init //Init MMI manager task

#define Scheduler_task_2_init power_task_init //Init Power task

#define Scheduler_task_3_init usb_task_sch_init //Init USB task

#define Scheduler_task_4_init player_task_init //Init Player task

#define Scheduler_task_5_init explorer_task_init //Init Explorer task

#define Scheduler_task_6_init update_task_init //Init Update task

// ***** Task definition *****

#define Scheduler_task_1 mmgr_task // MMI manager task

#define Scheduler_task_2 power_task // Power task

#define Scheduler_task_3 usb_sch_task // Mass storage task

#define Scheduler_task_4 player_task // Player task

#define Scheduler_task_5 explorer_task // Explorer task

#define Scheduler_task_6 update_task // Update task

Definition Label Description Values

POWER_SOURCE The power level under

which the system has to

run: very low (1.8V) or low

(3.3V)

INTERNAL_VLV_DC_DC

EXTERNAL_VLV_REGULATOR

[EXTERNAL_LV_DC_DC]

EXTERNAL_LV_REGULATOR

POWER_EXT_DC_ON External DC-DC control pin [P3_4]

I/O pins mnemonics are defined

in mcu.h file (See Section 3.1.5).

POWER_TYPE Type of power use [POWER_LOW_VOLTAGE]

POWER_VERY_LOW_VOLTAG

POWER_OFF_AUTO Automatic power-off [ENABLE]

DISABLE

POWER_BATTERY_SCAN_PERIOD Battery level scan period Value in seconds

POWER_BATTERY_LEVEL_ALERT Battery alert level 0 to 16