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8051 >> HI-TECH C PRO for the Silicon Labs 8051 MCU Family

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bstjacques
Tester

Reged: Jul 09 2007
Posts: 2

Array/Pointer Warning
#59972 - Fri Jun 06 2008 02:59 PM

Hi there,

I am recompiling a known Keil project with the latest Hi Tech compiler. This is a USB application using some reference code from SiLabs application notes. There are 3 string constants in code memory for the USB descriptors and an array that is supposed to point to each of the 3 strings.

The strings are declared like this:

const unsigned char String2Desc[STR2LEN] = ...

And the array of pointers to the strings is declared like this:

unsigned char* const StringDescTable[] =
{
String0Desc,
String1Desc,
String2Desc
};

I am getting warning "(359) illegal conversion between pointer types", but the code is still compiling. I would like get rid of the warning and be sure that everything is going to work correctly - any suggestions?

Aside from that, the program space with the Hi Tech compiler is 92% of what Keil is generating and the data space is coming in at 119%.

Thanks.

--------------------
Brian St Jacques

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bstjacques
Tester

Reged: Jul 09 2007
Posts: 2

Re: Array/Pointer Warning [Re: bstjacques]
#59982 - Fri Jun 06 2008 05:11 PM

So, I got rid of that warning by changing the declarations to:

code const unsigned char String2Desc[STR2LEN] =...

code const unsigned char* StringDescTable[] =
{
String0Desc,
String1Desc,
String2Desc
};

I still have a warning about the illegal conversion between pointer types, but it is because I am assigning one of the elements of StringDescTable to a generic unsigned char pointer variable that is not declared as "code const". Strange to me that it is described as "illegal" but only throws a warning?

My USB device is not enumerating correctly under the HT build, so I think I have it down to either this being the problem, or there is an initialization source file that Keil provides to be built in to your projects. I omitted this thinking that HiTech would generate their own initialization code, but maybe there is something needed in there?

--------------------
Brian St Jacques

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clyde
HI-TECH team member

Reged: Oct 16 2003
Posts: 622

Re: Array/Pointer Warning [Re: bstjacques]
#60022 - Sat Jun 07 2008 01:14 AM

It should be:
Code:


const unsigned char * const StringDescTable[] =
{
String0Desc,
String1Desc,
String2Desc
};

IOW this is a const array of pointers to const unsigned char.

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