[ts-7000] Re: Strange shifting variables

["berryma4" <>]

I got it!!!

In the gcc compiler book (5.33 Specifying Attributes of Types):

I needed: __attribute__ ((packed))

Like so:

typedef struct Reg_struct
{
    int32_t isConn;
    int32_t cfgIdx;
    int32_t cfgOff;
    int32_t regOff;
    int32_t regNum;
    int32_t regDir;
} __attribute__ ((packed)) Reg;



Thank you everyone for all your help!!!!!!!!!!!!!
Eric



--- In  Triffid Hunter <> wrote:
>
> On Tue, 1 Apr 2008, berryma4 wrote:
> 
> >
> >
> > Hello!
> >
> > I'm still having problems understanding what's wrong.  I've made some
> > changes (below is a new code snippet), adding the volatile and my g++
> > looks like this:
> >
> > It seems like I don't understand what I'm writing to.
> > preg->regOff = (TS_OUTB_DPORT_A)  //This doesn't work
> > preg->regOff = (TS_OUTB_DPORT_A << 16)  //While this does
> 
> try the functions from peekpoke.h on ts' ftp. gcc occasionally uses the 
> wrong instructions to read and write instead of 32 bit atomic ones,
which 
> does strange things to word aligned registers.
> 
>
ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7250-linux/samples/peekpoke.h is 
> the address.
> 
> > /* Declare register info structure */
> > typedef struct Reg_struct
> > {
> >    volatile unsigned int isConn;
> >    volatile unsigned int cfgIdx;
> >    volatile unsigned int cfgOff;
> >    volatile unsigned int regOff;
> >    volatile unsigned int regNum;
> >    volatile unsigned int regDir;
> > } Reg;
> 
> You may want to be explicit about how large these are, as int is
different 
> sizes on different platforms. #include <stdint.h> and declare them as 
> volatile uint32_t (uint32_t is unsigned 32 bit integer type).
> 
> > static asynStatus create(void* ppvt,asynUser* pasynUser,const char*
> > drvInfo, const char** pptypeName,size_t* psize)
> > {
> >    int addr = -1;
> >    volatile Reg* preg = NULL;
> >    volatile Port* pport = (Port*)ppvt;
> >
> >    switch( pport->type )
> >    {
> >    case TS_7200:
> > printf("XX0: 0x%x\n",preg->cfgOff);
> > printf("XX1: 0x%x\n",preg->regOff);
> 
> Looks like preg is being used here while initialised to NULL - is that 
> really what you want?
> 
> >        if( addr < 1 ){
> >           preg->cfgOff = (TS_DIOCR_DIRA << 16);
> 
> try PEEK32 here, see if it makes a difference
> 
> > printf("DirA: 0x%x 0x%x\n",preg->cfgOff,TS_DIOCR_DIRA);}
> 
> It would be interesting to disassemble the results (with objdump) and 
> compare
>



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