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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">You have to write a little state machine (or budget equivalent using flags), to keep track of which step in the process you’re up to.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I hope you’re not confusing register requests with process data. Process data can be read and written in a single cycle. Register requests (and other request types) require multiple cycles.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<P
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Shiva V M C <shivamachnalle@gmail.com>
<br>
<b>Sent:</b> Thursday, 14 February 2019 15:52<br>
<b>To:</b> Gavin Lambert <gavin.lambert@tomra.com><br>
<b>Subject:</b> Re: [etherlab-users] Userspace application.<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Gavin <o:p></o:p></p>
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<p class="MsoNormal">Can you please help me with a mentioned set of statements in a flow for writing value to a register and then reading again from the same register.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks in advance<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, 14 Feb, 2019, 3:50 AM Gavin Lambert <<a href="mailto:gavin.lambert@tomra.com">gavin.lambert@tomra.com</a> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">That’s not how you do register requests.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">For a write request, you first call ecrt_reg_request_data() to get a pointer and then write the data to be written into that buffer. Then you call ecrt_reg_request_write()
<i>once</i> to start the request. The request occurs asynchronously in the background and you have to call ecrt_reg_request_state() once per cycle to tell when it is completed. You must not try to start another read or write or alter the data in the write
buffer until after the request has completed (with success or failure).<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Reads are similar; you call ecrt_reg_request_read() once to start the request, then ecrt_reg_request_state() once per cycle until it reports success (or failure) and only then read
the resulting data out of the ecrt_reg_request_data() buffer.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Both operations may take an arbitrary number of cycles to complete, since they can be queued behind other requests.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">You
<i>can</i> start a read and write in the same cycle but only on separate request objects, and they will get queued anyway so there’s not much point. You absolutely should not try to sleep in the cyclic loop – the only sleep allowed in there is the “main” sleep
to wait for the next cycle.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p><strong><span style="font-family:"Calibri",sans-serif;color:#595959">Gavin Lambert</span></strong><b><span style="color:#595959"><br>
</span></b><span style="color:#595959">Senior Software Developer<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> etherlab-users <<a href="mailto:etherlab-users-bounces@etherlab.org" target="_blank">etherlab-users-bounces@etherlab.org</a>>
<b>On Behalf Of </b>Shiva V M C<br>
<b>Sent:</b> Thursday, 14 February 2019 00:59<br>
<b>To:</b> <a href="mailto:etherlab-users@etherlab.org" target="_blank">etherlab-users@etherlab.org</a><br>
<b>Subject:</b> [etherlab-users] Userspace application.</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi all,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have done with my user space application and I m able to run the application too.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Now I want to perform 2 exercise i.e.,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">1.ecrt_reg_request_write();<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">2.ecrt_reg_request_read();<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I m able to read the particular register,but couldn't able to write on any of the register.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">So,could any one help me whats happening?.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">This is my code snippet.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"> #define DigInSlavePos 0, 0<br>
#define Beckhoff_EL1240 0x00000002, 0x02312862<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I m doing this before activating master,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">if(!(sc_dig_in = ecrt_master_slave_config(master,DigInSlavePos,Beckhoff_EL1240)))<br>
{<br>
fprintf(stderr, "Failed to configure BeckHoff Salve.\n");<br>
return -1;<br>
}<br>
regis=ecrt_slave_config_create_reg_request(sc_dig_in,127);<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Then called cyclic_task as below
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">void cyclic_task()<br>
{<br>
ec_reg_request *regis;<br>
ecrt_master_receive(master);<br>
ecrt_domain_process(domain1);<br>
check_domain1_state(); //optional<br>
if (counter) counter--;<br>
else <br>
{ counter = FREQUENCY;<br>
blink = !blink;<br>
check_master_state(); //optional<br>
check_slave_config_states(); //optional;<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> ecrt_reg_request_write(regis,0xf80, 64);<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> sleep(1);<br>
ecrt_reg_request_read(regis,0xf80, 64);<br>
// send process data<br>
ecrt_domain_queue(domain1);<br>
ecrt_master_send(master);<br>
} <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">}<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">--
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><i>Thanks & Regards</i></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><i>Shiva V M C<br>
09880153358</i></b><o:p></o:p></p>
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