From: "jeremy" <chienyul@home.com>
To: <ecos-discuss@sourceware.cygnus.com>
Subject: [ECOS] HAL register write problem
Date: Thu, 18 Jan 2001 14:07:00 -0000 [thread overview]
Message-ID: <000e01c08183$65c3bf00$7c6509c0@viatech.com> (raw)
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)
I tried to write it as a word register by HAL_WRITE_UINT32, doesn't work
either,
Only works when I use HAL_WRITE_UINT8, but this way only writes in 0x80
instead
of 0x280. So the only way I can write it is to use arm ldr instruction
in vectors.S, which
is not good because I'll have more 16&32 bits registers to write.
Can anyone help me with this?
Thanks a lot!
Chien-Yu
next reply other threads:[~2001-01-18 14:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-18 14:07 jeremy [this message]
2001-01-18 15:11 ` Gary Thomas
2001-01-18 19:04 ` Jonathan Larmour
2001-01-19 8:33 ` Grant Edwards
2001-01-19 19:37 ` jeremy
2001-01-22 0:40 ` Jesper Skov
2001-01-23 16:16 jeremy
2001-01-24 7:18 ` Grant Edwards
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='000e01c08183$65c3bf00$7c6509c0@viatech.com' \
--to=chienyul@home.com \
--cc=ecos-discuss@sourceware.cygnus.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).