TMS570 ... uint32 nt aligned exception

Fabio Poiati

Prodigy 95 points

Part Number: TMS570LS3137

after a cast of a packed struct, I have an UINT32 varaible

in the memory position like the picture

When I try to use that variable, the execution creates an exception with

reset by call at PC=0x10.

I think there are an option to resolve this exception ...

Thank

Fabio

over 1 year ago

0 jagadish gundavarapu over 1 year ago

TI__Guru 69811 points

Hi Fabio,

Can you please show the structure and variable declaration and how you are using?

Please paste your code?

--
Thanks & regards,
Jagadish.

0 Fabio Poiati over 1 year ago in reply to jagadish gundavarapu

Prodigy 95 points

thanks

the inciminated struct is

PACK_STRUCT_BEGIN
struct igmp_msg {
PACK_STRUCT_FIELD(u8_t igmp_msgtype);
PACK_STRUCT_FIELD(u8_t igmp_maxresp);
PACK_STRUCT_FIELD(u16_t igmp_checksum);
PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END

and the field creates the exception is igmp_group_address that is

PACK_STRUCT_BEGIN
struct ip_addr_packed {
PACK_STRUCT_FIELD(u32_t addr);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END

declaring

struct igmp_msg* igmp;

when you try to check the addr value

if (0!=igmp->igmp_group_address.addr)

the execution crash

0 jagadish gundavarapu over 1 year ago in reply to Fabio Poiati

TI__Guru 69811 points

Hi Fabio,

First of all, apologies for the delay, i am on vacation for last one week.

Still i am unable to understand your code completely. If possible, can you please create a simplest project and share it to me so that i can trigger and debug the issue at my end.

--
Thanks & regards,
Jagadish.

0 Fabio Poiati over 1 year ago in reply to jagadish gundavarapu

Prodigy 95 points

the piece of code is coming from lwip stack on github and the incrimanated file is igmp.c

0 jagadish gundavarapu over 1 year ago in reply to Fabio Poiati

TI__Guru 69811 points

Hi,

When i check this code, this is excluded from build.

I don't know how you enabled the build and how you added a variable.

So, if possible, please share a code and that would be helpful to me for easy debugging.

Even you can send through private message.

--
Thanks & regards,
Jagadish.

0 Fabio Poiati over 1 year ago in reply to jagadish gundavarapu

Prodigy 95 points

Thanks for your effort Jagadish

the lwip stack is customized in my big project and it is not so easy to estrapolate a part ....

but I can tell you that in my igmp.c there is an include with

/*
----------------------------------
---------- IGMP options ----------
----------------------------------
*/
/**
* LWIP_IGMP==1: Turn on IGMP module.
*/
#ifndef LWIP_IGMP
#define LWIP_IGMP 1
#endif

that enable the part that crashs

Thanks

Fabio