GNU Arm Embedded Toolchain

sizeof array of structure

Asked by yilmaz eyidogan

Hi,

I cannot get sizeof structure array.

typedef struct{
 uint16_t * registerType;
 uint16_t * ptrU16; //r+w to same pointer
 uint16_t (*mbReadFuncPtr)(void);
 uint16_t (*mbWriteFuncPtr)(void);
 uint8_t orderOfRegister;
}ST_MODBUS_HOLDING_REGISTER_TYPE;

const ST_MODBUS_HOLDING_REGISTER_TYPE stHoldingRegArray[] = {
 {RW_U16_PTR_VAL,
 (uint16_t *)&ulPar1 + 1,
 rwDummyFunc,
 rwDummyFunc,
 START_OF_WORD_REGISTER},

 {RW_U16_PTR_VAL,
 ((uint16_t *)&ulPar1),
 rwDummyFunc,
 rwDummyFunc,
 END_OF_DWORD_REGISTER},

 {LAST_DUMMY_REGITER}
};

void getSize(void){
       uint16_t sizeOfHoldingRegister = sizeof(stHoldingRegArray)/sizeof(ST_MODBUS_HOLDING_REGISTER_TYPE);
}

Above sizeof operand causes this error:
invalid application of 'sizeof' to incomplete type 'const ST_MODBUS_HOLDING_REGISTER_TYPE[] {aka const struct <anonymous>[]}'

I couldn't find any solution. Could you please help?
I am using 2016q2 version of compiler for STM32F030 programming with Coocox software.

Thanks in advance.

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yilmaz eyidogan
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Thomas Preud'homme (thomas-preudhomme) said : 		#1

Hi Yilmaz,

Can you provide a complete testcase, ie also provide the declaration of the types used in this example? Do you still have the error if removing the const keyword?

Best regards.

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yilmaz eyidogan (yilmaz-eyidogan) said : 		#2

Hello Thomas,

I have found my mistake. sizeof operand should be used after structure array. My main trunk is different from above code, so I couldn't catch the problem until I put here a note.

Thanks for your help.