BLE multiple services and characteristics not working, error code 4 after service_init() function

[Namdev]

Hello,

I am new to Nordic platform, previously i had worked on TI controller.

I have three questions to ask:

1) My firmware consists of four services, each service has around 8-10 characterisitics. Now i have initialized four services. Its working fine and i am able to see the service list in nRF connect.

I start adding characteristics to the service, say) i have added 4 characteristics in each service it works fine. If i add one more characteristic in any of the service it starts going to  app_error_fault_handler(NRF_FAULT_ID_SDK_ERROR, 0, (uint32_t)(&error_info)); function.

2) I have read this tutorial found in github and implementing the same: 

https://github.com/bjornspockeli/custom_ble_service_example

Here we are asked to increase the RAM size when we add vendor specific UUID. can someone explain me if there is any equation or measurable parameter on how much RAM should be increased? How much RAM does each service consume. I use 128 bit UUID.

3) I have also increased the vendor_count to 4 but still its causing problem. 

I hope to receive a response in the earliest as i am in a critical stage.

Thanks & regards

Namdev Nayak

[Simonr]

Hi Namdev

Depending on your IDE, the build window (at least in SES) tells you how much your RAM/Flash needs to increase if that's the problem. What IDE are you using anyway? Also, are you able to see what function the app_error_fault_handler is called from? When in the application does this error occur.

You can also check if this error is called when you include one specific characteristic to a specific service or if it always occurs when you try adding characteristic number X total.

Best regards,

Simon

[HuanVH]

Find RAM in this post

[Namdev]

Hi Simon,

I am using SES(Segger embedded studio). 

the problem is:

there are four services. I have added 4 characteristics in service 1.

again 3 characteristics in service 2, 3 characterisitcs in service 3 and 5 characteristics in service 4.

Now if i add even a single characteristic in any of the service it will return error code 4.

static void services_init(void)
{
ret_code_t err_code;
ble_cus_init_t cus_init;
ble_calib_init_t calib_init;
ble_oper_init_t oper_init;
ble_config_init_t config_init;
ble_device_init_t device_init;

nrf_ble_qwr_init_t qwr_init = {0};

// Initialize Queued Write Module.
qwr_init.error_handler = nrf_qwr_error_handler;

err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
APP_ERROR_CHECK(err_code);

 memset(&calib_init, 0, sizeof(calib_init));
err_code = service 1(&c_cus, &calib_init);
 APP_ERROR_CHECK(err_code);

memset(&oper_init, 0, sizeof(oper_init))
err_code = service2(&o_cus, &oper_init);
APP_ERROR_CHECK(err_code);

 memset(&config_init, 0, sizeof(config_init))
 err_code = service3(&g_cus, &config_init);
 APP_ERROR_CHECK(err_code);

memset(&device_init, 0, sizeof(device_init));

err_code = service4(&d_cus, &device_init);
APP_ERROR_CHECK(err_code);

/*It is crashing after it completes this initialization*/

}

[Simonr]

Hi Namdev

What function is it that returns this error? Try stepping through the code in order to see which function it is that returns error code 4.

You can check out this and this link in order to check that you're adding multiple characteristics/services to your application correctly.

Best regards,

Simon

[Namdev]

in the service init the last function which is getting initialized returns the error. if i add an extra characterisitic to any of the service. 

I personally feel i need to increase the RAM size but i am still not sure why we need to improve the RAM size. i am just adding the multiple characterisitics under a service. 

I have implemented in the same way as mentioned in the other question posted in the forum.