Recent posts to String type object length in CANopen OD?https://forge.codesys.com/forge/talk/CODESYS-V2/thread/0ffd2da45b/2020-02-27T21:49:39.372000ZRecent posts to String type object length in CANopen OD?String type object length in CANopen OD?2020-02-27T21:49:39.372000Z2020-02-27T21:49:39.372000Zjusbe99https://forge.codesys.com/u/jusbe99/https://forge.codesys.come53f511cb35b511c610cf2f53d39ec7a246d0b4e<div class="markdown_content"><p>ODEntries is an ARRAY OF STRUCT.</p>
<p>But that was a valid test, thanks!</p></div>String type object length in CANopen OD?2020-02-27T21:49:37.877000Z2020-02-27T21:49:37.877000Zt.lundahlhttps://forge.codesys.com/u/t-lundahl/https://forge.codesys.come6ba895b0489681831ecf4e6121112e2a5041bbb<div class="markdown_content"><p>Wasn't The ODEntries[] an array. </p>
<p>I made an declaration yesterday with STRING<span>[255]</span> it's became 256 in length.</p></div>String type object length in CANopen OD?2020-02-27T21:49:36.363000Z2020-02-27T21:49:36.363000Zjusbe99https://forge.codesys.com/u/jusbe99/https://forge.codesys.come0c8bee242d8ff8abf1d3268c7bc8bdb0dc2ecaf<div class="markdown_content"><p>It is not an array. It is a STRING type variable, with length 4.</p>
<p>But wait a moment, does STRING(4) mean same as an ARRAY<span>[0..4]</span> OF BYTE, when thinking it with memory space needs? </p></div>String type object length in CANopen OD?2020-02-27T21:49:32.161000Z2020-02-27T21:49:32.161000Zt.lundahlhttps://forge.codesys.com/u/t-lundahl/https://forge.codesys.coma2315f06328dc8f498fe4219e7c81d40936b0ee0<div class="markdown_content"><p>If you declare an array as array<span>[4]</span> the size will be 5 (0-4).</p></div>String type object length in CANopen OD?2020-02-27T21:49:30.658000Z2020-02-27T21:49:30.658000Zjusbe99https://forge.codesys.com/u/jusbe99/https://forge.codesys.com87eedef08c0aaada614650a89a990769232c4420<div class="markdown_content"><p>Yes, it is a NULL character, the fifth one I mean.</p>
<p>So, it looks like the OD needs to have that extra place too, to have the memory organized. It works if I manually set the ODEntries[].wLen=4. Then I can send it by expedited SDO. Or maybe just limit the object to 3 characters. </p>
<p>Thanks nOrM!</p></div>String type object length in CANopen OD?2020-02-27T21:49:26.474000Z2020-02-27T21:49:26.474000Zndzied1https://forge.codesys.com/u/ndzied1/https://forge.codesys.comc99e451d66cc209f453020e89ebff572e9c25442<div class="markdown_content"><p>I am not anywhere where I can test it but in most programming languages a sting will have a null character (0x00) as a deliminator so that the processor knows where the string ends.</p>
<p>Can you move the object character by character? Whatever is reading it would have to know that it doesn't contain a null delimiter but it should be possible.</p></div>String type object length in CANopen OD?2020-02-27T21:49:24.971000Z2020-02-27T21:49:24.971000Zjusbe99https://forge.codesys.com/u/jusbe99/https://forge.codesys.com369e799aee77690b0a8bca60a9f330c0435966c1<div class="markdown_content"><p>Does anyone know, why a string variable takes one bytes more in ODEntries[] array, than it is defined in code?</p>
<p>I have a CANopen OD object, which is four characters long. Like this: variableName:STRING(4):='ABCD'. </p>
<p>But in ODEntries[] array its length is 5 (ODEntries[].wLen=5). Why is it like this? </p>
<p>I would like to read this object by expedited SDO, and now it doesn't fit in four bytes. Damn.</p>
<p>And I'am working with CoDeSys 2.3.9.4</p></div>