[ts-7000] Re: TS-7800 green LED woes

["Harold" <>]

"start" is a pointer to unsigned int, which is a 4-byte data type. Therefore, 
"(start + 0x8)" is the address 0xE8000020. Try this:

volatile unsigned char *start;

--- In  "craignied" <> wrote:
>
> Any idea why the following isn't turning on the green LED on the TS-7800?  
> The user manual claims that the Lattice FPGA's core is at base physical 
> address 0xe8000000, and the green LED is bit 30 at offset 0x8 
> (http://www.embeddedarm.com/about/resource.php?item=393#appendixB) ?
> 
> 
> int main(int argc, char **argv)
> {
>       volatile unsigned int *start, *LED;
>       int fd = open("/dev/mem", O_RDWR|O_SYNC);
>       assert(fd != -1);
>       
>       start = (unsigned int *)mmap(0, getpagesize(), PROT_READ|PROT_WRITE, 
> MAP_SHARED, fd, 0xE8000000);
>       LED = (unsigned int *)(start + 0x8);
>       while( 1 )
>       {
>               *LED = 0x40000000;
>       }
> 
>       close( fd );
>       return 0;
> }
> 
> TIA,
> Craig
>




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