Re: [ECOS] HAL register write problem

["jeremy" <chienyul at home dot com>]

Thanks.
I tried it, but still didn't work. And I found a strange thing.
I wrote a simple program like this:

#include <cyg/hal/hal_io.h>
int main(void)
{
HAL_WRITE_UINT8(0x3ffe014,0x6);
HAL_WRITE_UINT8(0x3ff5000,0x8);
HAL_WRITE_UINT32(0x3ff5004,0x12345678);
HAL_WRITE_UINT16(0x3ff4000,0x123);
 return 0;
}

After load and run it (i got a gdb-stub to do it), I used JEENI to
check the registers, and all these registers are written correctly.
But if I put the same code in plf_stub.c (which is compiled to a
ROM image), only HAL_WRITE_UNIT8 works after power-on.
The only difference is, the test program is compiled using packages
from "default" template and is start-up from  RAM, but the stub image
is compiled using "stub" template. One has kernal the other doesn't.
Do I need to add any package when compiling stub in order to use
16-bit and 32-bit HAL_WRITE ?
Thanks a lot!!

Jeremy




----- Original Message -----
From: "Grant Edwards" <grante@visi.com>
To: "jeremy" <chienyul@home.com>
Cc: <ecos-discuss@sourceware.cygnus.com>
Sent: Friday, January 19, 2001 8:37 AM
Subject: Re: [ECOS] HAL register write problem


> On Thu, Jan 18, 2001 at 11:17:55AM -0800, jeremy wrote:
>
> > #define CYG_DEVICE_SERIAL_RS232_UART_UBRDIV \
> >     ((volatile cyg_uint16 *) CYG_DEVICE_SERIAL_RS232_UART_BASE +
0x14)
>
> Are you sure that you want
>         ((volatile cyg_uint16 *)XXX + 0x14)
> and not
>         ((volatile cyg_uint16 *)(XXX+0x14))
>
> I've been bitten by that one...
>
> --
> Grant Edwards
> grante@visi.com
>
 jeremy wrote:
>>
>>My platform is Samsung KS32C50100, which operates in big-endian mode.
>> I got some problem with writing to register using HAL_WRITE function.
>> For example, in plf_stub.c where I put the UART initialization
function
>> in,
>> Here I write some initialize value to UART control registers,
>>  HAL_WRITE_UINT8 (CYG_DEVICE_SERIAL_RS232_UART_UTXBUF, 0x0);
>>  HAL_WRITE_UINT8 (CYG_DEVICE_SERIAL_RS232_UART_URXBUF, 0x0);
>>  HAL_WRITE_UINT16(CYG_DEVICE_SERIAL_RS232_UART_UBRDIV, 0x280);
>>
>> The first two lines for writing 8-bits registers works fine. But the
>> last line doesn't write
>> anything into the 16-bits register. I defined that 16-bits register
>> like this in the first part
>> of the program:
>> #define CYG_DEVICE_SERIAL_RS232_UART_UBRDIV \
>>     ((volatile cyg_uint16 *) CYG_DEVICE_SERIAL_RS232_UART_BASE +
0x14)

>At a guess, you were probably intending to write

>#define CYG_DEVICE_SERIAL_RS232_UART_UBRDIV \
>    ((volatile cyg_uint16 *) (CYG_DEVICE_SERIAL_RS232_UART_BASE +
0x14))

>because adding 0x14 to something cast to a pointer to a 16-bit type
will
>increment it by 2*0x14=0x28 bytes.

>Jifl
>--
>Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223)
271062
>Un cheval, pas du glue. Pas du cheval, beaucoup du glue. ||
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