NUS example - sd_ble_gatts_hvx returns error number 0x3003

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

Susheel Nuguru — Sun, 26 Jul 2015 16:57:04 GMT

glad to help :)

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

MANGO — Fri, 24 Jul 2015 03:11:12 GMT

LOL, you were right!!!

static void ble_evt_dispatch(ble_evt_t * p_ble_evt){
//volatile static uint8_t k = 0;
//volatile static uint32_t ev[20] = {0,};
//ev[k++] = p_ble_evt->header.evt_id;

It was my fault. I placed some code to understand the event procedures.

Since I kept recursively called ble_evt_dispatch, it did corrupted the memory.

Thanks Aryan!

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

Susheel Nuguru — Thu, 23 Jul 2015 13:21:25 GMT

I am not an expert in IAR, but in KEIL you can have watch points and can create a breakpoint when an address is changed. That will be useful if you can do the same in IAR. Try to set a breakpoint for modification of for example service_handle at 0X2000291A

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

MANGO — Thu, 23 Jul 2015 12:09:44 GMT

Hmm... This sounds like a big trouble...

Can you recommend me some analyzing tech for this?

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

Susheel Nuguru — Thu, 23 Jul 2015 11:17:46 GMT

They clearly seem to be different handles p_nus->service_handle p_nus->tx_handles p_nus->rx_handles these cannot change for a characteristic, seems like memory corruption

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

Susheel Nuguru — Thu, 23 Jul 2015 10:20:26 GMT

Did you compare if the contents of m_nus and hvx_params when it succeeds and when it failed. can you also show the contents of hvx_params like you did with m_nus.

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

MANGO — Thu, 23 Jul 2015 08:20:43 GMT

I modified ble_hrs.c. Execpt that, I didn't made a change.

Then what could be the reason for this?

Is there a chance that I made a pointer operation and changed some values of m_nus?

(Also, I apologize for writing the wrong error type. I edited it.)

RE: NUS example - sd_ble_gatts_hvx returns error number 0x3003

Susheel Nuguru — Thu, 23 Jul 2015 07:45:52 GMT

looking into SDK7.2\components\softdevice\s110\headers\ble_err.h

#define BLE_ERROR_INVALID_ATTR_HANDLE    (NRF_ERROR_STK_BASE_NUM+0x003) /**< Invalid attribute handle. */

seems like the p_hvx_params used in sd_ble_gatts_hvs has invalid handle in it. have you changed anything in this code or using it as it is? Just adding timer should not effect this unless the timer handler is trying to do and HVX before the handle is initialized.