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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- Shell Script Operation under Linux --><HTML><HEAD><TITLE>Shell Script Operation under Linux</TITLE><META HTTP-EQUIV="content-type" CONTENT="text/html; charset=iso-8859-1"></HEAD><BODY BACKGROUND="spiral.gif" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#990099" ALINK="#FF0000"><TABLE WIDTH="98%"><TR><TD WIDTH=60 VALIGN=BOTTOM NOWRAP><IMG SRC="transp.gif" ALT="" WIDTH=60 HEIGHT=20></TD><TD><!-- Ab hier Seitentext: --><P><BIG><BR><STRONG><U>III.4 Shell Script Operation under Linux</U></STRONG></BIG></P><P><BIG>If serial I/O is only used for program upload, shell script operation may bethe most convenient way of testing with the shortest turn-around cycles.The sample script file below, shows the principles of operating<NOBR>BOOT-51</NOBR> from a PC, running under Linux, with shell commands:</BIG></P><P><STRONG><CODE> #!/bin/sh<BR> stty 9600 sane clocal -crtscts -hupcl </dev/ttyS1 # until stty 1.16<BR> # stty -F /dev/ttyS1 9600 sane clocal -crtscts -hupcl # stty 2.0 or later<BR> reset51 /dev/lp0<BR> sleep 1<BR> asem $1.a51<BR> echo "U" >/dev/ttyS1<BR> cp $1.hex /dev/ttyS1<BR> echo "G 8000" >/dev/ttyS1<BR></CODE></STRONG></P><P><BIG>In this example, serial I/O is done over serial port <EM>/dev/ttyS1</EM>,and the target system can be reset over printer port <EM>/dev/lp0</EM>.<BR>First of all, the serial port <EM>/dev/ttyS1</EM> is initialized to the desiredbaudrate of 9600 Baud, <NOBR>8 data</NOBR> bits, <NOBR>1 stop</NOBR> bit,no parity and no handshake with the <STRONG>stty</STRONG> command.(If your <STRONG>stty</STRONG> is version <NOBR>2.0</NOBR> or later, better usethe new command syntax with the <NOBR>-F</NOBR> option, as shown in commentary!)<BR>Then the <STRONG>reset51</STRONG> program provided is executed to reset the targetsystem via printer port <EM>/dev/lp0</EM>. After that, the <STRONG>sleep</STRONG> commandwaits until <NOBR>BOOT-51</NOBR> has recovered from reset, fully outputits sign-on message, and is ready for a command.<BR>Now <NOBR>ASEM-51</NOBR> is invoked to assemble the application program.<BR>When finished, the <NOBR>BOOT-51</NOBR> upload command 'U' is echoed to<EM>/dev/ttyS1</EM>, and the Intel-HEX file is also simply copied to thatserial port.<BR>Finally the application program is started at address 8000H with thecommand <NOBR>'echo "G 8000" >/dev/ttyS1'</NOBR>.<BR>To test an application program <NOBR><EM>myprog.a51</EM></NOBR> with the aboveshell script (stored in a file <EM>test51</EM>), simply type</BIG></P><P><BIG><BLOCKQUOTE><STRONG><CODE>test51 myprog</CODE></STRONG></BLOCKQUOTE></BIG></P><P><BIG>at the shell prompt, and see what you get.<BR>Of course this was only a minimized example! In general you will not onlyhave to modify serial port, baudrate, reset port, and start address foryour local requirements, but also to do something for plausibility checkingand error handling.<BR>For this, the more sophisticated script file <STRONG>boot</STRONG> has been provided.It allows an easy change of all configuration parameters with any ASCIIeditor. For further information see the commentary inside <STRONG>boot</STRONG>.<BR>In principle, <STRONG>boot</STRONG> contains only those configuration data!(The actual work is done by another script <STRONG>upload</STRONG> provided, which isinvoked by <STRONG>boot</STRONG>. If your <STRONG>stty</STRONG> command is version 2.0 or later,better use the script file <STRONG>upload.new</STRONG> instead!)<BR>A program <NOBR><EM>myprog.a51</EM></NOBR> can now be assembled, uploaded andstarted with</BIG></P><P><BIG><BLOCKQUOTE><STRONG><CODE>boot myprog</CODE></STRONG></BLOCKQUOTE></BIG></P><P><BIG>To get the <STRONG>boot</STRONG> script running, ensure that you have full read/writeaccess to the serial port used as upload device!<BR>If a printer port is employed as reset device, the <STRONG>reset51</STRONG> programrequires root privileges! (see below)</BIG></P><P><BIG>Finally, the <STRONG>reset51</STRONG> program provided, may be worth a detailed explanation:When invoked, <STRONG>reset51</STRONG> forms a reset pulse of the duration <pulsewidth>at the D0 and D1 outputs of a PC printer <port>, or at the DTR output of aserial <port>:</BIG></P><P><BLOCKQUOTE><BIG><STRONG><CODE>reset51 /dev/<port> [<pulsewidth>]</CODE></STRONG></BIG></BLOCKQUOTE></P><P><TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0><TR><TD VALIGN=TOP><BIG>Legal <port> values are:</BIG></TD> <TD NOWRAP> </TD> <TD NOWRAP><BIG>lp0, lp1, lp2,<BR> ttyS0, ttyS1, ttyS2, ttyS3,<BR> cua0, cua1, cua2, cua3,<BR> null</BIG></TD></TR></TABLE></P><P><BIG>Under Linux with kernels <NOBR>2.0.x</NOBR> the printer ports are assignedto fixed I/O base addresses<NOBR>(lp0 = 3BCH</NOBR>, <NOBR>lp1 = 378H</NOBR>, <NOBR>lp2 = 278H)</NOBR>.<BR>From kernel <NOBR>2.2.0</NOBR>, the parport layer has been introduced,providing dynamic printer port assignment. If your <NOBR>2.2.x</NOBR> kerneldoesn't contain parport layer support or the <EM>/proc</EM> file system, youshould recompile it respectively. This should also make PCI bus printer portsavailable as reset devices.<BR><STRONG>reset51</STRONG> can only handle the four standard PC serial ports ttyS0 thru ttyS3.(However, the <STRONG>boot</STRONG> script described above should also work with non-standardserial ports, because it operates them with the <STRONG>stty</STRONG> command only!)<BR>The serial ports ttyS0 and cua0 are equivalent, and so are ttyS1 and cua1,and so on.<BR>If <EM>/dev/null</EM> is specified as <port>, <STRONG>reset51</STRONG> delays onlyfor <pulsewidth> ms.</BIG></P><P><BIG>The optional parameter <pulsewidth> is the duration of the reset pulse in ms.<BR>Legal values are: 1 <= <pulsewidth> <= 65535. (default is 50)<BR>When invoked without parameters, a help screen is displayed.<BR>In case of error, <STRONG>reset51</STRONG> returns the exit code 1, 0 otherwise.<BR>When executed, <STRONG>reset51</STRONG> forms a positive pulse at D0 <NOBR>(pin 2)</NOBR>,and a negative pulse at D1 <NOBR>(pin 3)</NOBR> of a PC printer port, or a"high" pulse <NOBR>(-12 V !!!)</NOBR> at the DTR output of a serialport respectively.<BR>If the default pulse width of <NOBR>50 ms</NOBR> is too short to reset the<NOBR>MCS-51</NOBR> board, specify a greater pulse width.</BIG></P><P><BIG>Since <STRONG>reset51</STRONG> needs direct access to I/O ports, it requires root privileges!To make it available for all users, set the owner to "root" and set the<NOBR>"set-user-id"-bit</NOBR>:</BIG></P><P><BIG><BLOCKQUOTE><STRONG><CODE>chown root reset51<BR>chmod u+s reset51</CODE></STRONG></BLOCKQUOTE></BIG></P><P><BIG>For shell script operation, a reset line is highly recommended! If you don'thave it, you will always have to press the reset button of the target system,before invoking the <STRONG>boot</STRONG> script. Since this may easily be forgotten,it is better to automate this step.</BIG></P><!-- Seitentext Ende --><P><BR><BR><CENTER><TABLE WIDTH="70%"><TR><TH><A HREF="boot51.htm"><IMG SRC="home.gif" ALT="[contents]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH> <TH><A HREF="boperat.htm"><IMG SRC="up.gif" ALT="[up]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH> <TH><A HREF="butils.htm"><IMG SRC="back.gif" ALT="[back]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH> <TH><A HREF="bblink.htm"><IMG SRC="next.gif" ALT="[next]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH></TR></TABLE></CENTER></P></TD></TR></TABLE></BODY></HTML>⌨️ 快捷键说明
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