Hi Alfred,
On Fri, Jun 16, 2017 at 07:02:47PM +0200, Alfred Schilken wrote:
> Hello all, I’m experimenting with mynewt for several weeks now and I’m
> especially impressed by the statistics, logging and image update
> functionality.
> I’m having problems with getting all the statistics using newtmgr via BLE.
>
> I took bleprph as base, added ADC and enabled several stats, logs and so on.
> To reduce flash size I had to switch off debug and reduce the logging.
>
> When I started the program I got an Assert-reboot-loop.
> The target board is a bbc microbit.
>
> This seems to be cause of the error:
> ble_att_svr_entry_mem = malloc(
> OS_MEMPOOL_BYTES(ble_hs_max_attrs, sizeof (struct ble_att_svr_entry)));
> if (ble_att_svr_entry_mem == NULL) {
> rc = BLE_HS_ENOMEM;
> goto err;
> }
Fitting BLE and newtmgr into 16kB requires some creativity :). There
are certainly some memory and mbuf optimizations that could be made, we
just need to go through the exercise of scouring the code.
> I tweaked these four config values to fix the crash-loop.
> BLE_ACL_BUF_COUNT: 4 # was 4
> BLE_ACL_BUF_SIZE: 128 # was 255
> MSYS_1_BLOCK_COUNT: 4 # was 12
> MSYS_1_BLOCK_SIZE: 292 # was 292
>
> The program boots now, I can see and connect to the BLE services and all this
> is fine.
>
> If I use newtmgr via ble transport to read the statistics, some of them are
> responding, others return just Error: 2.
> mpstat and taskstat also don’t work.
> But „image list“ is working, I could even upload a new image.
>
>
> My question is:
> What are the best config settings to reduce ram usage, so that an app runs in
> 16 kb with least impact on functionality?
I was able to get mpstats working on a 16kB device with the following
mbuf settings:
MSYS_1_BLOCK_COUNT: 11
MSYS_1_BLOCK_SIZE: 200
> Some hints to reduce flash size would also be appreciated :-)
You might want to look into the split image functionality:
https://mynewt.apache.org/latest/os/modules/split/split. This allows
you dedicate more flash space to your application code. I don't think
this will help with your immediates issues, however, since BLE and
newtmgr would both need to go into the loader image.
Chris
