Acceleration active and deactivate GPS

RE: Acceleration active and deactivate GPS

Håkon Alseth — Fri, 24 Apr 2020 14:47:20 GMT

Hi Hoang,

Can this be your issue? The timer is by default 16 bit, so it will not be able to count as long as 60 secs:

https://infocenter.nordicsemi.com/topic/ps_nrf9160/timer.html?cp=2_0_0_5_15_4_18#register.BITMODE

You can use the kernel timer API as well, since you already have the "schedule to main" functionality implemented.

https://docs.zephyrproject.org/1.12.0/kernel/timing/timers.html#defining-a-timer

To get it reoccurring, remember to add this to the _start function call:

k_timer_start(&my_sync_timer, K_SECONDS(10), K_SECONDS(10);
 
Kind regards,
Håkon

RE: Acceleration active and deactivate GPS

Hoang — Thu, 23 Apr 2020 14:02:38 GMT

Hi Håkon Alseth,

in the timer.zip

#define TIMEOUT 60000 //milisecond 

static u32_t timestamp_prev;
int counter ;
bool gps_enable_timeout; 

nrfx_timer_t my_timer = NRFX_TIMER_INSTANCE(0);
nrfx_timer_config_t my_timer_config = NRFX_TIMER_DEFAULT_CONFIG;

void timer_cb(nrf_timer_event_t event_type, void * p_context) {
    
    timestamp_prev = k_uptime_get_32();
    counter += 1;
    printk("counter: %d \r",counter);
    printk("timestamp_prev: %d \n\r",timestamp_prev); 
    printk("set_gps_enable----------\r");
    printk("start GPS ..\n");
    set_gps_enable(true);
    gps_enable_timeout = true ; 

    printk("gps_enable_timeout: %d \n\r", gps_enable_timeout); 
}

void main() {

    printk("Timer sample started\n");
    counter = 0; 
    gps_enable_timeout = false; 

    IRQ_CONNECT(DT_NORDIC_NRF_TIMER_TIMER_0_IRQ_0, 
                DT_NORDIC_NRF_TIMER_TIMER_0_IRQ_0_PRIORITY, 
                nrfx_isr, 
                nrfx_timer_0_irq_handler, 
                0);


    my_timer_config.frequency = NRF_TIMER_FREQ_31250Hz;
    
    nrfx_err_t err = nrfx_timer_init(&my_timer, &my_timer_config, timer_cb);
    if (err != NRFX_SUCCESS) {
        printk("timer_init error: %d\n", err);
        return;
    }

    // Set the timer to trigger every second.
    
      uint32_t time_ticks = nrfx_timer_ms_to_ticks(&my_timer, TIMEOUT);
      printk("Setting compare, timeout after %d ticks\n", time_ticks ); 
    
  // nrfx_timer_compare(&my_timer, NRF_TIMER_CC_CHANNEL0, nrfx_timer_ms_to_ticks(&my_timer, TIMEOUT), true);
     nrfx_timer_compare(&my_timer, NRF_TIMER_CC_CHANNEL0,time_ticks, true);
   
    
     printk("Starting timer\n");
     nrfx_timer_enable(&my_timer);
    
     printk("Timer started\n");
    
    
}

I changed the TIMEOUT to 60000 (miliseconds), I expected the timer will "trigger" after TIMEOUT

But, it always trigger after 1s.

I check the document: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v16.0.0%2Fgroup__nrfx__timer.html&cp=7_1_6_9_0_37_1_10&anchor=ga949efcc263af88d63ecdce7eaa3d5761

Did I misunderstand somewhere?

Thanks,

Best Regards,

Hoang

RE: Acceleration active and deactivate GPS

Håkon Alseth — Wed, 22 Apr 2020 14:00:08 GMT

Hi Hoang,

Its not stated directly that you shouldn't call socket operations directly from interrupt, nor that the kernel timers are executed in interrupt context, and we should document this a bit better. I'll write it down as a improvement and report it internally.

Kind regards,

Håkon

RE: Acceleration active and deactivate GPS

Hoang — Wed, 22 Apr 2020 13:05:40 GMT

Thank Håkon Alseth,

I will read and try to understand your guide. Thanks a lot ( Sorry, I don't have knowledge about programming )

BR,

Hoang Nguyen

RE: Acceleration active and deactivate GPS

Håkon Alseth — Wed, 22 Apr 2020 12:46:39 GMT

Hi,

You are asserting because a kernel function is called from interrupt context. Try setting a flag and handle it in main, or push the work to a workqueue instead.

Note that all socket operations will trigger an interrupt to communicate with the modem, so no socket functions should be called from an interrupt.

Kind regards,

Håkon

RE: Acceleration active and deactivate GPS

Hoang — Wed, 22 Apr 2020 00:51:49 GMT

Hi Håkon Alseth,

I tried:

1. accelerate trigger will :

1.1. Reset the timer: Timer

1.2. Start the timer: Timer

2. If the Timer > 5mn (no motion in 5mn) -->Stop --> enable GPS to find Stop-Position

So, I need a function for the timer , and i found :

https://devzone.nordicsemi.com/f/nordic-q-a/59950/timers-in-nrf9160-soc/244049#244049

And, i modified the timer_cb() to test:

void timer_cb(nrf_timer_event_t event_type, void * p_context) {
    printk("start GPS ..\n");
    gps_control_init(&application_work_q, gps_trigger_handler);
    printk("set_gps_enable----------\r");
    set_gps_enable(true);
}

i want i can start the GPS, but I got the error:

start GPS ..
 gps_control_init(struct k_work_q  gps_trigger_handler_t handler 

 device_get_binding ---------- 

 gps_trigger_set ---------- 

ASSERTION FAIL [!arch_is_in_isr()] @ C:/Demos/nordic/ncs_09032020/zephyr/kernel/include/ksched.h:269
	
[00:00:01.542,327] [1B][1;31m<err> os: r0/a1:  0x00000004  r1/a2:  0x0000010d  r2/a3:  0x00000001[1B][0m
[00:00:01.551,177] [1B][1;31m<err> os: r3/a4:  0x40008000 r12/ip:  0x00000000 r14/lr:  0x0002e7cb[1B][0m
[00:00:01.560,058] [1B][1;31m<err> os:  xpsr:  0x6100001f[1B][0m
[00:00:01.565,368] [1B][1;31m<err> os: s[ 0]:  0x00000000  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000[1B][0m
[00:00:01.575,988] [1B][1;31m<err> os: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000[1B][0m
[00:00:01.586,639] [1B][1;31m<err> os: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000[1B][0m
[00:00:01.597,259] [1B][1;31m<err> os: s[12]:  0x00000000  s[13]:  0x00000002  s[14]:  0x00000000  s[15]:  0x00000000[1B][0m
[00:00:01.607,910] [1B][1;31m<err> os: fpscr:  0x4000f000[1B][0m
[00:00:01.613,220] [1B][1;31m<err> os: Faulting instruction address (r15/pc): 0x00033284[1B][0m
[00:00:01.621,307] [1B][1;31m<err> os: >>> ZEPHYR FATAL ERROR 4: Kernel panic on CPU 0[1B][0m
[00:00:01.629,180] [1B][1;31m<err> os: Fault during interrupt handling

How can I use the timer to start the GPS?

Do you have any suggestions?

Thanks so much

RE: Acceleration active and deactivate GPS

Hoang — Tue, 21 Apr 2020 11:17:51 GMT

[quote userid="2115" url="~/f/nordic-q-a/60377/acceleration-active-and-deactivate-gps/245724"]How do you define the "STOP" position? Is it to be detected based on a sensor event, or a timeout event? How to distinguish a stop at a traffic light vs. an actual stop?[/quote]

I tried to use the timeout event, for example in 1mn, if no motion --> actual stop

[quote userid="2115" url="~/f/nordic-q-a/60377/acceleration-active-and-deactivate-gps/245724"]One way of doing this can be: if you store the time since last registered movement, then start the GPS a given amount of time after the last movement was detected.[/quote]

Ja, I will try this one 😃

Thanks

RE: Acceleration active and deactivate GPS

Håkon Alseth — Tue, 21 Apr 2020 07:24:59 GMT

Hi,

How do you define the "STOP" position? Is it to be detected based on a sensor event, or a timeout event? How to distinguish a stop at a traffic light vs. an actual stop?

One way of doing this can be: if you store the time since last registered movement, then start the GPS a given amount of time after the last movement was detected.

Kind regards,

Håkon

RE: Acceleration active and deactivate GPS

Hoang — Mon, 20 Apr 2020 19:58:39 GMT

[quote userid="2115" url="~/f/nordic-q-a/60377/acceleration-active-and-deactivate-gps/245557"]Do you want to stop the GPS, or start it again? These two functions enable/disable the gps_controller[/quote]

I want to start GPS again. For example, my thingy:91 is staying in my car, when the car is moving: start GPS and capture the start-Position, then stop GPS. When the car stops, start GPS again, and capture the stop-Position. During the moving time of the car, the THINGY:91 will sleep (to save the power), it just captures 2 positions: start and stop position.

RE: Acceleration active and deactivate GPS

Håkon Alseth — Mon, 20 Apr 2020 13:20:23 GMT

Hi,

[quote user=""]But, I dont know how to implement the step 2: when it stops, GPS will be activated again: Position-OFF[/quote]

Do you want to stop the GPS, or start it again? These two functions enable/disable the gps_controller library: https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/applications/asset_tracker/src/gps_controller/gps_controller.c#L125-L133

If you're using asset_tracker, as-is, you can also look at this function:

https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/applications/asset_tracker/src/main.c#L1221

Kind regards,

Håkon