Hello,
I am trying to set a data breakpoint expression on a global array or global variable but I don't seem to be able to.
Each time I set a data breakpoint I get a '?' next to the breakpoint. See attached picture.
uint8_t ble_ad[HB_BLE_AD_BUFF_SIZE_MAX].
I am using segger Embedded Studio v5.60 and nRF52833 SoC.
Thank you.
Kind regards
Mohamed
Hello Mohamed,
I created a global array named 'ble_ad' to try and reproduce this here, but it seemed to work for me. In your case, when you start typing your expression, does the variable get displayed up in the suggestion list as shown here:
?
Kind regards,
Vidar
Hi Vidar,
Thank you for the quick response.
What you did worked for me too. I ran into problems when I tried to use a data breakpoint expression applied to that variable. I suggest you edit your data breakpoint and try to use the expression I am using ble_ad[4] != 0 or any other C-like expression.
After restarting SES IDE I can now set the data breakpoint expression without getting the '?' next to it. Very odd!
However, the program is not breaking as expected. I checked this by setting a breakpoint at the line where ble_ad[6] is assigned the value 0x19 and it does execute this line an breaks.
ble_ad[6] = LINK_LINE_TYPE_HOMEBEACON;
Note, is an enum, defined ia header file as
typedef enum eLinkLineType
{
LINK_LINE_TYPE_AGENCY = 0x00, /**< ? */
LINK_LINE_TYPE_BUILDING_OWN = 0x01, /**< ? */
...
LINK_LINE_TYPE_HOMEBEACON = 0x19U,
...
} link_PacketType_t;
Thank you.
Kind regards
Mohamed
Hi Mohamed,
I see the same as you now when I try to configure the breakpoint to trigger on a specific value. I do not get the question mark next to it, but it does not break either. I wonder if this may be an issue with Segger embedded studio because it does break when I try to configure the same breakpoint in Segger Ozone.
Kind regards,
Vidar
Hi Vidar,
I downloaded Ozone and got it running but I still cannot set a data breakpoint with a C-like expression. See screen capture below. The OK field remains always greyed out and the only option available is 'Cancel'. What am I doing wrong?
Kind regards
Mohamed
Hi Mohammed,
In Ozone, the value condition is specified at the end and not as a part of the expression. Please try to do it like this:
Also, notice that the value mask is set to '0'. '1's in the mask are used to mark bits to ignore.
Kind regards,
Vidar
Great! it works now Thank you. The moral is "Read the user manual" 
I am chasing an intermittent bug which could be caused by a possible stack overflow. How do I set a data breakpoint that is triggered when ble_[6] != 0x19?
One more question. how do I capture the debugging logs appearing in the Terminal window in a text file automatically?
Kind regards
Mohamed
I am glad to hear that it worked!
I am chasing an intermittent bug which could be caused by a possible stack overflow. How do I set a data breakpoint that is triggered when ble_[6] != 0x19?
I do not think the HW comparators on Cortex M4 support these kinds of expressions. It does not appear to be supported in Ozone, at least.
An alternative (not as good as a breakpoint) may be to use trace in Ozone and sample the register value periodically. This way you can monitor whether the array element is overwritten or not.
One more question. how do I capture the debugging logs appearing in the Terminal window in a text file automatically?
The documentation explains how you can do it in Ozone, but it is not something I have tried myself. For SES you can do it like this:
