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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>This posting actually helped me solve my
problem too, BUT you do not need to perform step 3, instead, use the NUTO/S Configuration
tool and set the UART1 to Half Duplex, PORTD and Bit 5.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It works a treat!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Douglas</span></font></st1:place><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
en-nut-discussion-bounces@egnite.de
[mailto:en-nut-discussion-bounces@egnite.de] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Zheng Anding<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, 14 May 2004 7:45
a.m.<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Ethernut
User Chat</st1:PersonName> (English)<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [En-Nut-Discussion]
Ethernut II RS485 Communication</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi Dusan,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks for your reply and kindly help. Actually I've figured out the
solution for Ethernut II RS-485 with the great help of Mr.Damian. Here I would
like to give my credit to Mr.Damian. I couldn't finish it without his help.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>It's a little bit difference from yours since I use Ethernut II and use
UART0 as RS232 and UART1 as RS485. I would like to contribute out since
it looks like so far I havn't seen any similar post. Hope this will
help some beginners like me to get into the board faster and save some time for
more other codes. The procedure are:<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>0. Follow the hardware manual to configure the UART0 as RS232 and UART1
as RS485...;<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>1. Follow the hardware manual and decide which pin you want to use as a
toggle pin. Here I use PD5 which is set by shorten Pin1&2, 3&4 of JP2
on board;<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2. Take a look at board and find the correct screw pin for 485A &
485B. Here I found a mistake on hardware manual that the position of RS485 A/B
is different from which is drawn in manual. Actually it's swapped. On board you
should read D(DC) - S(Shield) - A(RS485A) and B(RS485B). Hook up A(RS485A) to
High(+) and B(RS485B) to Low(-) of your own 485 device or RS232/485 converter;<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>3. Modify nut/include/cfg/modem.h. Since I want to use UART0 as RS232
and UART1 as RS485. So what I did is comment out all the "define
UART1***" under "#if 1"except the following three
definitions. Then change the UART0 to UART1. And change the UART1_HDX_BIT value
to 5 since I decide to use PD5 as a toggle pin;<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>#if 1<br>
/* Define half duplex for RS485 */<br>
#define UART1_HDX_PORT PORTD<br>
#define UART1_HDX_DDR DDRD<br>
#define UART1_HDX_BIT 5<br>
#endif<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>4. Since I use ICCAVR, I use nutconf.exe under \ethernut\nut to rebuild
the Nut/OS libs. After running this utility, all the new built
libs will be automatically copied into ICCAVR's library directory. You
dont need to do anything to copy by yourself;<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>5. Here are a piece of my initialization code which is working fine on
Ethernut II board. I'm using latest Nut/OS 3.4.2.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>// More other includes files .....<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>#include <dev/usartavr.h><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>int got;<br>
FILE *uart0, *uart1;<br>
u_long baud = 9600, flag = USART_MF_HALFDUPLEX;<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>NutRegisterDevice(&devUsartAvr0, 0, 0);<br>
NutRegisterDevice(&devUsartAvr1, 0, 0);<br>
<br>
uart0 = fopen("uart0", "r+b");<br>
uart1 = fopen("uart1", "r+b");<br>
<br>
_ioctl(_fileno(uart0), UART_SETSPEED, &baud);<br>
_ioctl(_fileno(uart1), UART_SETSPEED, &baud);<br>
_ioctl(_fileno(uart1), UART_SETFLOWCONTROL, &flag);<br>
<br>
for (;;)<br>
{<br>
got = fread(RecBuf, 1, 32, uart1);<br>
fprintf(uart0, "Receive %d bytes...\n", got);<br>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> NutSleep(1000);<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
fwrite(WriteBuf, 1, 11, uart1); <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> fprintf(uart0, "Write 11 bytes...\n");<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
NutSleep(1000);<br>
}<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>6. Rebuild All of your project and you should be able to use RS485 now.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>BTW, you've to get the latest usartavr.c which I got from Mr.Damian and
I'm sure you can download it from somewhere else...<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Let me know if I mistake anything or any questions about it. Thanks.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Regards,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Alex<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<b><i><span style='font-weight:bold;font-style:italic'>Dusan Ferbas <dferbas@dfsoft.cz></span></i></b>
wrote:<o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid #1010FF 1.0pt;padding:0cm 0cm 0cm 2.0pt;
margin-left:1.9pt;margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi Alex,<br>
<br>
you need to modify SW. First is to enable direction pin toggling (see 1). <br>
Then properly initialize usart - use new driver and set USART_MF_HALFDUPLEX <br>
mode (see 3 below).<br>
<br>
You can live also with original Nut sources if you will set speed after <br>
changing flow control mode. See example below.<br>
<br>
You can omit setting speed if you use Damian Slee's bug correction. Look <br>
for it in discussion archive 17th February, 16th April (BugFix: Usart half <br>
duplex mode... )<br>
<br>
Anyway: CVS maintainers what about to incorporate Damian's fixes ?<br>
<br>
----<br>
1) nut/include/cfg/modem.h<br>
<br>
For RS485 you do not need RTS/CTS so only following has to be enabled. <br>
Whole block is by default "#if 0". Do not enable (allow define) for <br>
..._RTS/CTS_.... This adds more code and also processing within USART driver.<br>
<br>
#if 1<br>
/* Define half duplex for RS485 */<br>
#define UART0_HDX_PORT PORTD<br>
#define UART0_HDX_DDR DDRD<br>
#define UART0_HDX_BIT 4<br>
#endif<br>
<br>
2) recompile Nut/OS libraries with 'make install'<br>
<br>
3) example of initialization: call as InitUart0(9600);<br>
<br>
FILE *InitUart0(u_long baud)<br>
{<br>
FILE *uart;<br>
<br>
//u_long cooked_mode = 0; /* disable <br>
replacing \n with \r\n */<br>
<br>
NutRegisterDevice(&devUsartAvr0, 0, 0);<br>
uart = fopen("uart0", "r+b"); /* select binary <br>
mode */<br>
<br>
u_long flags = USART_MF_HALFDUPLEX;<br>
_ioctl(_fileno(uart0), UART_SETFLOWCONTROL, &flags); /* due to <br>
bug in Nut/OS 3.5.0 do this BEFORE SETSPEED */<br>
_ioctl(_fileno(uart), UART_SETSPEED, &baud);<br>
//following is set automatically when binary mode is selected<br>
//_ioctl(_fileno(uart), UART_SETCOOKEDMODE, &cooked_mode);<br>
<br>
return uart;<br>
}<br>
<br>
>But I cann't get anything from my slave device so far. My questions are:<br>
><br>
>1. Is there anything special for the hardware se tting? Did I setup my <br>
>board correctly?<br>
>2. I knew the 485 on Ethernut is half duplex and have to use PD5 / PD4 to <br>
>control the data direction, but based on Nut/OS, do I still need to do <br>
>this? Is there any existing RS-485 UART driver for Nut/OS now?<br>
>3. If the above answer is NO, do I have to wirte ISR for Mega128 to send <br>
>and receive package?<br>
><br>
>Thanks for any kindly help.<br>
><br>
>Sincerely,<br>
>Alex<br>
<br>
<br>
Dusan Ferbas<br>
www.dfsoft.cz <br>
<br>
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</blockquote>
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