Examples using the scheduler

RE: Examples using the scheduler

Ankush — Thu, 12 Jan 2017 07:30:04 GMT

Hi ,

I want to implement scheduler in my application which has SAADC, BLE streaming at 1000 samples per second and SD card writing. I am facing the problem that as soon as I start BLE streaming Complete code gets stopped. Without BLE streaming , I can write into SD card. The details about the issue is mentioned in this thread Here

I have suggested to use app_scheduler. I have gone through scheduler tutorial. But how can I implement it with BLE, SAADC and SPI events.

Can anyone suggest me anything about this?

RE: Examples using the scheduler

GlennEngel — Sat, 31 Oct 2015 20:08:13 GMT

This is a great response. It should be included in the documentation! Item one should mention that #include "app_scheduler.h" is required.

RE: Examples using the scheduler

Vyacheslav Lebets — Sun, 11 Jan 2015 06:43:34 GMT

Values of this macro can be found in any examples in SDK:

//Maximum size of scheduler events. Note that scheduler BLE stack events do not contain any data, as the events are being pulled from the stack in the event handler

#define SCHED_MAX_EVENT_DATA_SIZE sizeof(app_timer_event_t)

//Maximum number of events in the scheduler queue

#define SCHED_QUEUE_SIZE    20

RE: Examples using the scheduler

la-ble — Sun, 11 Jan 2015 01:15:20 GMT

@lebets_vi, What is the value of SCHED_MAX_EVENT_DATA_SIZE? No macro is defined in my app_scheduler.h. 8B, 16B, 32B? I'm also not actually passing any data at this point. Does passing 0 do anything unexpected? Is the minimum 1?

RE: Examples using the scheduler

Vyacheslav Lebets — Tue, 07 Oct 2014 20:45:23 GMT

Need to init sheduler in main() like this:

APP_SCHED_INIT(SCHED_MAX_EVENT_DATA_SIZE, SCHED_QUEUE_SIZE);
in main() need insert this code:

while(1) { app_sched_execute(); ... }
in app_sheduler.h we have Scheduler event handler type:

typedef void (*app_sched_event_handler_t)(void * p_event_data, uint16_t event_size);
Declare own function like than typedef:

void my_flash_event_func(void *data, uint16_t size); //this is event handler
In any place where it is need, we call:

app_sched_event_put(pointer_to_own_data, size_of_data, my_flash_event_func); //this is event

And sheduler will call your function "my_flash_event_func" with params: "pointer_to_own_data" and "size_of_data" like this:

my_flash_event_func(pointer_to_data, size_of_data);

RE: Examples using the scheduler

Locky — Tue, 07 Oct 2014 19:12:39 GMT

Could I interpret a lack of response as meaning there are a lack of available examples? The reason I made this post is as I'm developing my application, without a real-time event handler on the Nordic platofrm, I'm having to write alot of app_timers to simulate event handing. Timers are a very messy way of handling real-time events, and do not allow for any kind of queued processing? Hope someone can chime in. Thanks