Structure coding and initialization

[Plzhelp]

Dear All,

I have coded a small structure and initialized it. I am getting some error while compiling this code. How can I resolve this problem?? I will be grateful for your help.

C code:
struct ver_id
{
U32 address;
U32 mode_val;
U32 rst_val;

U32 majVer : 12;
struct regDef majVer_rD;

U32 minVer : 20;
struct regDef minVer_rD ;
};

struct ver_id initval = {initval.address = 0x0, initval.rst_val = 0x00100000, initval.majVer = 1, initval.majVer_rD.maskVal=0xFFF00000,
initval.majVer_rD.mode=READ , initval.minVer = 0,initval.minVer_rD.maskVal=0x000FFFFF,initval.minVer_rD.mode=READ };


Error flashed by Visual Studio compiler:

1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(30): error C2099: initializer is not a constant
1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(30): error C2099: initializer is not a constant
1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(30): error C2099: initializer is not a constant
1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(30): error C2099: initializer is not a constant
1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(31): error C2099: initializer is not a constant
1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(31): error C2099: initializer is not a constant
1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(31): error C2099: initializer is not a constant
1>c:\users\anmukher\documents\visual studio 2010\projects\structures\structures\ppcs_pma_reg.c(31): error C2099: initializer is not a constant


Thanks in advance.

 

[krazyfencer]

Hello,

Your problem is that you can't initialize structs like that. When initializing a struct with the {} syntax, you want to just provide a list of all the values of the members *in the order declared in the struct*. If the member is another struct, you can define the submembers using another {}. Try this (assuming that your definition of the struct regDef has the fields defined in the order maskVal, mode with no other members in the struct):

/* Edit, the forum ate my whitespace that made the comment line up with the values. Let me know if the syntax doesn't make sense... */
/* addr mode_val rst_val majVer majVer_rd maskVal mode end minVer minVer_rd maskVal mode end end_of_struct */
struct ver_id initval = {0x0, 0x0, 0x00100000, 1, { 0xFFF00000, READ }, 0, { 0x000FFFFF, READ } };

I can't run it because I don't have your definition of struct regDef, but assuming it is something like:

struct regDef {
U32 maskVal;
U32 mode;
};

Where READ is defined as some number, this should work (hopefully). Let me know...

 

[emma2409]

struct ver_id
{
U32 address;
U32 mode_val;
U32 rst_val;

U32 majVer : 12;
struct regDef majVer_rD;

U32 minVer : 20;
struct regDef minVer_rD ;
};

in this i think you are trying to declare a structure inside another one which is not allowed