nrf52840, S140.
So for the past 1 or 2 weeks I have been fighting with this problem:
Now it turned out that the connection handle may actually be INVALID, it's 0!
So I debugged the wind out of the whole thing and found that I cannot change the value of the active connection handle"m_active_conn_handle", which I use to pass as the active connection handle to a variety of functions including for example sd_ble_hvx().
Here is the program:
else if (p_ble_evt->header.evt_id == BLE_GAP_EVT_CONNECTED)
{
uint32_t* error_code = &m_active_conn_handle;
m_active_conn_handle = (uint16_t)p_ble_evt->evt.gap_evt.conn_handle;
//m_active_conn_handle = 0x1234;
error_code = sd_ble_gatts_sys_attr_set(p_ble_evt->evt.gatts_evt.conn_handle, NULL, 0, 0);
}
I set a breakpoint at:
m_active_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
and then pressed F10. Instead of the right value (0x8e4), the m_active_conn_handle got set to 0x0000.
This is really strange? Making an uneducated guess, is this caused by allocating m_active_conn_handle at the wrong address, like some sort of read only RAM region? Or stack region? Or is this caused by RAM_BASE_ADDRESS not configured properly?
Also, a lot of error code won't show unless I play some "tricks", for example:
err_code = sd_ble_gatts_hvx(m_active_conn_handle, &hvx_params);
the err_code will not show when breakpointed, it will simply display "out of scope" in keil's watch window but if I write:
err_code_address = & err_code;
below it, and set the breakpoint there, the err_code_address will NOT display the address of err_code, still "out of scope", but err_code will now properly display if you move your mouse cursor over it!
All of these lead me to believe I have set certain memory address wrong, but then again, that's just my uneducated guess, here is my config in the magic wand:
Also, when calling
error_code = sd_ble_enable(&ble_enable,&USER_APP_RAM_BASE);
I'm using USER_APP_RAM_BASE = 0, which I know is a really, really bad idea but I can't modify its value to anything other than that either, for the same reason I can't modify the active connection handle's value.
Can someone please tell me what the whirlwind is going on??? Please help! Many thanks!
edit @endnode can you help me??
Edit: Quick answer: turn off optimization, and the problems "unable to change value, values not properly being displayed etc. are all gone.
