CPEEKH - Revision history

http://wiki.mcselec.com/bavr/index.php?action=history&feed=atom&title=CPEEKH CPEEKH - Revision history 2026-06-03T00:18:19Z Revision history for this page on the wiki MediaWiki 1.18.6 http://wiki.mcselec.com/bavr/index.php?title=CPEEKH&diff=4989&oldid=prev Admin at 20:25, 13 December 2014 2014-12-13T20:25:16Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 20:25, 13 December 2014</td> </tr><tr><td colspan="2" class="diff-lineno">Line 69:</td> <td colspan="2" class="diff-lineno">Line 69:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"><span style="font-family: Arial;"></del>&nbsp;<del class="diffchange diffchange-inline"></span><span style="font-size: 10pt;"></del>While the AVR uses word addresses since all instructions are 2 bytes long, the Cpeek() function uses a byte address. You need to take that in consideration with for example a boot loader address. The Atmel data sheet will only mention word addresses. For example boot loader address $1000 in the data sheet is $2000 and $2001 byte address for Cpeek().<del class="diffchange diffchange-inline"></span></del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>&nbsp;While the AVR uses word addresses since all instructions are 2 bytes long, the Cpeek() function uses a byte address. You need to take that in consideration with for example a boot loader address. The Atmel data sheet will only mention word addresses. For example boot loader address $1000 in the data sheet is $2000 and $2001 byte address for Cpeek().</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= <span class="f_Header">See also</span> =</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= <span class="f_Header">See also</span> =</div></td></tr> </table>

Admin http://wiki.mcselec.com/bavr/index.php?title=CPEEKH&diff=4988&oldid=prev Admin at 20:25, 13 December 2014 2014-12-13T20:25:02Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 20:25, 13 December 2014</td> </tr><tr><td colspan="2" class="diff-lineno">Line 69:</td> <td colspan="2" class="diff-lineno">Line 69:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;<ins class="diffchange diffchange-inline"></span><span style="font-size: 10pt;">While the AVR uses word addresses since all instructions are 2 bytes long, the Cpeek() function uses a byte address. You need to take that in consideration with for example a boot loader address. The Atmel data sheet will only mention word addresses. For example boot loader address $1000 in the data sheet is $2000 and $2001 byte address for Cpeek().</ins></span></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= <span class="f_Header">See also</span> =</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= <span class="f_Header">See also</span> =</div></td></tr> </table>

Admin http://wiki.mcselec.com/bavr/index.php?title=CPEEKH&diff=4693&oldid=prev Admin at 13:24, 4 February 2014 2014-02-04T13:24:50Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 13:24, 4 February 2014</td> </tr><tr><td colspan="2" class="diff-lineno">Line 45:</td> <td colspan="2" class="diff-lineno">Line 45:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">CpeekH</del>(<del class="diffchange diffchange-inline">0</del>) <del class="diffchange diffchange-inline">will return </del>the first <del class="diffchange diffchange-inline">byte of the upper 64KB</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The similar Cpeek</ins>() <ins class="diffchange diffchange-inline">function only works on </ins>the first <ins class="diffchange diffchange-inline">64 KB page. It was intended for processors with memory up to 64 KB</ins>.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Since </del>the <del class="diffchange diffchange-inline">M103 has 64K words of code space </del>the <del class="diffchange diffchange-inline">LPM instruction can not access the 64 upper Kbytes</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">When processors were made by Atmel with larger memory like </ins>the <ins class="diffchange diffchange-inline">Mega128 (128 KB) </ins>the <ins class="diffchange diffchange-inline">cpeekH() function was added</ins>.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The CpeekH() function <del class="diffchange diffchange-inline">peeks in </del>the <del class="diffchange diffchange-inline">upper 64 KB</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The CpeekH() function <ins class="diffchange diffchange-inline">uses </ins>the <ins class="diffchange diffchange-inline">ELPM instruction instead of the LPM instruction that Cpeek() uses</ins>.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">This </del>function <del class="diffchange diffchange-inline">should be used with </del>the <del class="diffchange diffchange-inline">M103 or M128 only</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">&nbsp;</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Since the memory is broken up in page of 64 KB, the cpeekH() </ins>function <ins class="diffchange diffchange-inline">also access the memory in pages.</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">You can also omit the page number in which case the compiler will calculate </ins>the <ins class="diffchange diffchange-inline">proper page address</ins>.</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">&nbsp;</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>CpeekH(address,0) will work on the first page (first 64 KB)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>CpeekH(address,0) will work on the first page (first 64 KB)</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>CpeekH(<del class="diffchange diffchange-inline">addres</del>,1) will work on the second page (second 64 KB)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>CpeekH(<ins class="diffchange diffchange-inline">address</ins>,1) will work on the second page (second 64 KB)</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">&nbsp;</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">[[File:Notice.jpg]]When omitting the page, the compiler will calculate and load the page register automatically.</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><span style="font-family: Arial;">&nbsp;</span></div></td></tr> </table>

Admin http://wiki.mcselec.com/bavr/index.php?title=CPEEKH&diff=558&oldid=prev Admin: Created page with "= <span class="f_Header">Action</span> = Returns a byte stored in upper page of code memory of micro with more then 64KB such as M103, M128. <span style="font-family: Arial;..." 2013-02-08T13:18:59Z

<p>Created page with "= <span class="f_Header">Action</span> = Returns a byte stored in upper page of code memory of micro with more then 64KB such as M103, M128. <span style="font-family: Arial;..."</p> <p><b>New page</b></p><div>= <span class="f_Header">Action</span> =<br /> <br /> Returns a byte stored in upper page of code memory of micro with more then 64KB such as M103, M128.<br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> = <span class="f_Header">Syntax</span> =<br /> <br /> var =&nbsp;<span class="f_Syntax">CPEEKH</span>( address [,page] )<br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> = <span class="f_Header">Remarks</span> =<br /> <div style="padding: 0px; margin: 0px 0px 0px 4px;"><br /> {| width="604" cellspacing="0" cellpadding="1" border="1" style="border: 2px solid rgb(0, 0, 0); border-spacing: 0px; border-collapse: collapse;"<br /> |- style="vertical-align: top;"<br /> | valign="top" width="16%" style="width: 93px; border: 1px solid rgb(0, 0, 0);" | <br /> Var<br /> <br /> | valign="top" width="100%" style="width: 502px; border: 1px solid rgb(0, 0, 0);" | <br /> Numeric variable that is assigned with the content of the program memory at<br /> <br /> address<br /> <br /> |- style="vertical-align: top;"<br /> | valign="top" width="16%" style="width: 93px; border: 1px solid rgb(0, 0, 0);" | <br /> address<br /> <br /> | valign="top" width="100%" style="width: 502px; border: 1px solid rgb(0, 0, 0);" | <br /> Numeric variable or constant with the address location<br /> <br /> |- style="vertical-align: top;"<br /> | valign="top" width="16%" style="width: 93px; border: 1px solid rgb(0, 0, 0);" | <br /> page<br /> <br /> | valign="top" width="100%" style="width: 502px; border: 1px solid rgb(0, 0, 0);" | <br /> A numeric variable or constant with the page address. Each page is 64 KB.<br /> <br /> |}<br /> </div><br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> CpeekH(0) will return the first byte of the upper 64KB.<br /> <br /> Since the M103 has 64K words of code space the LPM instruction can not access the 64 upper Kbytes.<br /> <br /> The CpeekH() function peeks in the upper 64 KB.<br /> <br /> This function should be used with the M103 or M128 only.<br /> <br /> CpeekH(address,0) will work on the first page (first 64 KB)<br /> <br /> CpeekH(addres,1) will work on the second page (second 64 KB)<br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> = <span class="f_Header">See also</span> =<br /> <br /> [[PEEK]]&nbsp;,&nbsp;[[POKE]]&nbsp;,&nbsp;[[INP]]&nbsp;,&nbsp;[[OUT]]<br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> <span style="font-family: Arial;">&nbsp;</span><br /> <br /> = <span class="f_Header">Example</span> =<br /> <br /> <br/><source lang="bascomavr"><br /> '-----------------------------------------------------------------------------------------<br /> 'name : peek.bas<br /> 'copyright : (c) 1995-2005, MCS Electronics<br /> 'purpose : demonstrates PEEk, POKE, CPEEK, INP and OUT<br /> 'micro : Mega48<br /> 'suited for demo : yes<br /> 'commercial addon needed : no<br /> '-----------------------------------------------------------------------------------------<br /> <br /> $regfile = "m48def.dat" ' specify the used micro<br /> $crystal = 4000000 ' used crystal frequency<br /> $baud = 19200 ' use baud rate<br /> $hwstack = 32 ' default use 32 for the hardware stack<br /> $swstack = 10 ' default use 10 for the SW stack<br /> $framesize = 40 ' default use 40 for the frame space<br /> <br /> Dim I As Integer , B1 As Byte<br /> 'dump internal memory<br /> For I = 0 To 31 'only 32 registers in AVR<br /> B1 = Peek(i) 'get byte from internal memory<br /> Print Hex(b1) ; " ";<br /> 'Poke I , 1 'write a value into memory<br /> Next<br /> Print 'new line<br /> 'be careful when writing into internal memory !!<br /> <br /> 'now dump a part ofthe code-memory(program)<br /> For I = 0 To 255<br /> B1 = Cpeek(i) 'get byte from internal memory<br /> Print Hex(b1) ; " ";<br /> Next<br /> 'note that you can not write into codememory!!<br /> <br /> Out &H8000 , 1 'write 1 into XRAM at address 8000<br /> B1 = Inp(&H8000) 'return value from XRAM<br /> Print B1<br /> End<br /> </source><br/>{{Languages}}<br /> <br /> [[Category:BASCOM Language Reference]]</div>

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