ADVERTISE DATA INTERRUPTS ADC FUNCTION

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Mon, 2020-11-16 08:27
#1
balaji
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ADVERTISE DATA INTERRUPTS ADC FUNCTION

Hi Dialog,

I have a follow up query from following thread

https://support.dialog-semiconductor.com/forums/post/dialog-smartbond-bluetooth-low-energy-%E2%80%93-software/ultrasonic-interface-using-timer

// My ADC configuration adc_config_t echo_pin_cfg = { .input_mode = ADC_INPUT_MODE_SINGLE_ENDED, .input = ADC_INPUT_SE_P0_6, .smpl_time_mult = 15, .continuous = true, .interval_mult = 0, .input_attenuator = ADC_INPUT_ATTN_4X, .chopping = false, .oversampling = 7 }; adc_init(&echo_pin_cfg); //Sample ISR code void timer_0_isr() { if ((counter % 4) == 0) // approx every 50 microsecond { adc_count = adc_get_sample(); sprintf((char *) tempbuff," %d , %d \n",adc_count,counter); uart_send(UART2, (uint8_t *) tempbuff, strlen(tempbuff), UART_OP_BLOCKING); } counter ++; }

FYI : The Timer 0 ISR reload value is 12.5 micro seconds

PROJECT USED :ble_app_peripheral

When I tried to debug my application i getgarbage values from my ADC channel, whenBLE starts advertising. Otherwise I get required ADC counts. This repeats for every3seconds as BLE interval is set for this value inuser_peripheral.hWhen I turn OffADV PACKETSthrough setting

// Default Handler Operations static const struct default_app_operations user_default_app_operations = { .default_operation_adv = NULL, // PREVIOUSLY ITS DEFINED AS user_app_adv_start };

inuser_callback_config.hI get proper output from my ADC channel.

P.S. check the attached file and do the needful.

I need clarification on why BLE ADV timer interrupts ADC channel, how to overcome it ?

Br,

BALAJI.

Keywords:
ADC SAMPLES
BLE ADV TIMER
Attachment:
PDF iconADC SAMPLES WITH PLOT.pdf
Device:
DA14580
Tue, 2020-11-17 16:01
PM_Dialog
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Joined:2018-02-08 11:03
Hi BALAJI,

Hi BALAJI,

Thanks for your post.

Can you please indicate which BLE device you are using? Is it DA14580 ( according to your initial post) or DA14531 TINY module ( according to your previous post) ?

Are you using any of the available sleep modes? What is the value of the app_default_sleep_mode variable in user_config.h header file?

Please keep in mind that the device can sleep between intervals ( advertising or connections). When the chip is sleeping, all the peripheral domains including ADC, UART and TIMERS are powered down.

You could use the app_easy_timer(), as it is using the BLE Timer and is available in sleep mode.

In the user_app_adv_start() you could also disable the app_adv_data_update_timer_used TIMER that is scheduling the next advertising data update.

Thanks, PM_Dialog

Thu, 2020-11-19 06:43
(Reply to #2)
balaji
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Hi Dialog,

Hi Dialog,

Sorry for late reply/

I'm using DA14531 module , for development usingDevelopment Kit - USB.

My sleep config

/****************************************** * Default sleep mode. Possible values are: * * - ARCH_SLEEP_OFF * - ARCH_EXT_SLEEP_ON * - ARCH_EXT_SLEEP_OTP_COPY_ON * ****************************************** */ static const sleep_state_t app_default_sleep_mode = ARCH_SLEEP_OFF;

I have following queries from your reply,

1. What is the BLE_ADV_INTERVAL? and from below config (user_peripheral.h)

/* Duration of timer for connection parameter update request */ #define APP_PARAM_UPDATE_REQUEST_TO (1000) // 1000*10ms = 10sec, The maximum allowed value is 41943sec (4194300 * 10ms) /* Advertising data update timer */ #define APP_ADV_DATA_UPDATE_TO (3000) // 3000*10ms = 30sec, The maximum allowed value is 41943sec (4194300 * 10ms) /* Manufacturer specific data constants */ #define APP_AD_MSD_COMPANY_ID (0xABCD) #define APP_AD_MSD_COMPANY_ID_LEN (2) #define APP_AD_MSD_DATA_LEN (sizeof(uint16_t))

I infer its3 secfor each ADV and after30 sec its updates ADV parameters . correct me if I'm wrong.

So if that is the case every 3 sec this ble_adv interrupts my timer ISR where I got stuck.

我的要求是配置定时器0为12.5米cro-seconds and run it till 40 ms , (counter value => 3200 * 12.5) , which is reset after 40 ms and wait for 12.5 micro-second and timer overflow and cycle repeats. Now this BLE_ADV interrupts my 40 ms loop and I get Garbage values in my ADC channel.

Note : BLE is the main update we are making in our product and we can't put it to SLEEP MODE as per our product specification.

I can share my full code, bcoz of IP i can't share here , so if any mail ID is provided it would be much easier to replicate my issue.

Thanks in advance

Br,

BALAJI

Thu, 2020-11-19 15:03
PM_Dialog
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Hi BALAJI,

Hi BALAJI,

The app_adv_data_update_timer_used timer elapses every APP_ADV_DATA_UPDATE_TO seconds. So, upon its expiration, the adv_data_update_timer_cb() is triggered in order to update the advertising data on the fly (specifically the manufacturer data)

>>> I infer its 3 sec for each ADV and after 30 sec its updates ADV parameters . correct me if I'm wrong.

Can you please clarify this statement – to be honest I didn’t get what you mean exactly.

Let’s take part by part – the SDK includes a peripheral example for the TIMER0. So, if you run it on non-BLE project, is the TIMER0 configured correctly and the callback is getting triggered as expected?

If yes, please run it in debug mode in a BLE example and add breakpoint on the timer_0_isr(). Does the breakpoint hit, so that the adc_get_sample() is executed ?

Thanks, PM_Dialog

Fri, 2020-11-20 03:56
balaji
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Hi Dialog,

Hi Dialog,

I have following config in user_callback_config.h

// Default Handler Operations static const struct default_app_operations user_default_app_operations = { .default_operation_adv = user_app_adv_start, };

So what this function actually do. Could you explain ?

What is the BLE advertisment interval used in BLE projects from SDK 6.0.12.1020 ?

Thanks in advance

Br,

BALAJI.

Fri, 2020-11-20 15:17
PM_Dialog
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Hi Balaji,

Hi Balaji,

First of all, I would strongly suggest you to use that lasted version of SDK which is SDK6.0.14.

This is the callback function that is responsible for the advertisement. If you remove the user_app_adv_start() and place NULL that device will not start advertising – of course you should put it into sleep mode. If you check the user_app_adv_start() source code, you will see that the app_easy_gap_undirected_advertise_get_active*( is creating the message that will be send to the BLE stack and the app_easy_gap_undirected_advertise_start() starts advertising for undirected connection.

The advertising intervals are set into the user_adv_conf structure in user_config.h header file. I would recommend first checking theBLE Advertising Tutorial (HTML)tutorial.

Thanks, PM_Dialog