http://forums.leaflabs.com/topic.php?id=86 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:17:14 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=86&page=2#post-1443 Wed, 29 Sep 2010 19:42:53 +0000 StephenFromNYC 1443@http://forums.leaflabs.com/ <p>Wednesday September 29, 2010</p> <p>Hello,</p> <p>The possible problem with strcmp() does not involve micros(). I just wanted to use micros() as a course tool to diagnose the problem.</p> <p>I started a new thread to describe my problem with strcmp().</p> <p><a href="http://forums.leaflabs.com/topic.php?id=209" rel="nofollow">http://forums.leaflabs.com/topic.php?id=209</a></p> <p>Thanks for the help!</p> <p>Stephen from NYC </p> http://forums.leaflabs.com/topic.php?id=86&page=2#post-1427 Tue, 28 Sep 2010 18:18:13 +0000 perry 1427@http://forums.leaflabs.com/ <p>Hi stephen,</p> <p>Can you post the most minimal sample code you can make that exhibits the problem? </p> http://forums.leaflabs.com/topic.php?id=86&page=2#post-1420 Tue, 28 Sep 2010 09:59:11 +0000 StephenFromNYC 1420@http://forums.leaflabs.com/ <p>Tuesday September 28, 2010</p> <p>Hello,</p> <p>I was wondering if someone can give me a complete list of the files I need to copy from the github repository to my Windows XP Professional SP3 system to implement the micros() function.</p> <p>I am currently using Maple-IDE 0.0.6.</p> <p>I have some code (originally written for the Arduino Duemilanove) which uses the strcmp() function to interpret a command sent from the system to the microcontroller. I want to determine the execution time of one call to strcmp() in different situations (eg. different values of the string being compared).</p> <p>The code works on the Arduino (yes, I included the string.h file), but when I use the modified code (eg. deleted Serial.begin() and using SerialUSB()) on the Maple it pauses for several seconds every 21st iteration of the while loop. The delay I experience is different at each "hiccup". Sometimes it pauses at 42 (getting through the 21st iteration of the while loop) or 63 (getting through the 21st and 42nd iteration of the while loop), etc. I think I once saw the code reach the 168th iteration without stopping, but this is not common.</p> <p>I am speculating the problem might involve timing, so I want to see if the execution of strcmp is slower or faster every 21n iteration. This is why I cannot execute strcmp 1000X and then use millis().</p> <p>If I can create a short version of my code which produces the problem I will post the code another time.</p> <p>Thanks for the help!</p> <p>Stephen from NYC </p> http://forums.leaflabs.com/topic.php?id=86&page=2#post-662 Tue, 03 Aug 2010 00:08:20 +0000 bnewbold 662@http://forums.leaflabs.com/ <p>Programs do run privileged, though in some cases further flags must be configured to actually access registers. In this case libmaple has access, so usercode will too. </p> <p>It does look like we should be able to get micros() and delay() to work without too much pain. </p> http://forums.leaflabs.com/topic.php?id=86#post-648 Wed, 28 Jul 2010 19:06:08 +0000 gbulmer 648@http://forums.leaflabs.com/ <p>Sorry for asking for more information on Systick. </p> <p>I used my Mac's Spotlight, and found "PM0056 Programming manual, STM32F10xxx Cortex-M3 programming manual", and the register is described in:<br /> "4.5.3 SysTick current value register (STK_VAL) ...<br /> Bits 23:0 CURRENT[23:0]: Current counter value<br /> The VAL register contains the current value of the SysTick counter.<br /> Reads return the current value of the SysTick counter."<br /> So it looks like micros() could be implemented by reading that value, and a bit of math to scale it. plus the value of millis.</p> <p>Do programs run 'privileged', so that it can read those values? </p> http://forums.leaflabs.com/topic.php?id=86#post-647 Wed, 28 Jul 2010 18:45:45 +0000 gbulmer 647@http://forums.leaflabs.com/ <p>Excellent news on fixing SerialUSB on XP. Well done. That is very pleasing.</p> <p>On a different subject, I wonder if I am missing something about the Systick timer? I am interested in fixing micros().</p> <p>In document 13587 (STM32F103x8/xB, "Medium-density performance line ARM-based 32-bit MCU ..."), it says:<br /> "SysTick timer<br /> This timer is dedicated for OS, but could also be used as a standard downcounter. It<br /> features:<br /> ● A 24-bit downcounter<br /> ● Autoreload capability<br /> ● Maskable system interrupt generation when the counter reaches 0<br /> ● Programmable clock source"<br /> The 24-bit downcounter might be visible, but I haven't found any further useful information.</p> <p>I looked in document 13902 (RM0008 Reference manual), and the only information I can find it says is<br /> "9.1.1 SysTick calibration value register<br /> The SysTick calibration value is set to 9000, which gives a reference time base of 1ms with<br /> the SysTick clock set to 9 MHz (max HCLK/8)."</p> <p>Which sounds like other values could be set (and why use a 24-bit downcounter to count down from 9000, unless it can?)<br /> I've also tried searching ST.COM looking for Systick, and didn't find anything helpful.</p> <p>Any suggestions where I might find more information?<br /> I use micros() quite a lot in some Arduino code, so I am interested in digging around to fix it on Maple (in my 473uSec of spare time :-)</p> <p>GB </p> http://forums.leaflabs.com/topic.php?id=86#post-646 Wed, 28 Jul 2010 15:12:18 +0000 bnewbold 646@http://forums.leaflabs.com/ <p>Awesome! </p> http://forums.leaflabs.com/topic.php?id=86#post-642 Wed, 28 Jul 2010 09:25:24 +0000 leaflabsandy 642@http://forums.leaflabs.com/ <p>Quote: "Has anybody who was having trouble with SerialUSB under XP tried the 0.0.6 IDE?" </p> <p>Works for me. </p> <p>Quote: It worked in our testing, though I think it worked last time as well. </p> <p>It probably worked on the other platforms last time (0.5.0) but never on the XP platform<br /> for me. </p> http://forums.leaflabs.com/topic.php?id=86#post-637 Tue, 27 Jul 2010 21:37:58 +0000 bnewbold 637@http://forums.leaflabs.com/ <p>Has anybody who was having trouble with SerialUSB under XP tried the 0.0.6 IDE? Success/Failure? It worked in our testing, though I think it worked last time as well. </p> http://forums.leaflabs.com/topic.php?id=86#post-545 Tue, 13 Jul 2010 13:22:45 +0000 poslathian 545@http://forums.leaflabs.com/ <p>thanks for lining up your coverage in one place. VERY helpful! </p> <p>I agree the worst problem is the SerialUSB portability issue. Were working on a different direction there, hopefully well see some improvement soon. </p> http://forums.leaflabs.com/topic.php?id=86#post-543 Tue, 13 Jul 2010 13:03:03 +0000 bnewbold 543@http://forums.leaflabs.com/ <p>As an update... </p> <p>#1. Color fixed<br /> #3. Color fixed<br /> #4. Color fixed<br /> #6. Noted in docs<br /> #8. Noted in docs<br /> #9. Color fixed</p> <p>These changes should appear in 0.0.6 </p> http://forums.leaflabs.com/topic.php?id=86#post-513 Thu, 08 Jul 2010 18:07:47 +0000 perry 513@http://forums.leaflabs.com/ <p>We've been tracking issues internally, feel free to post issues on github and we'll update as necessary. </p> http://forums.leaflabs.com/topic.php?id=86#post-503 Thu, 08 Jul 2010 05:21:57 +0000 gbulmer 503@http://forums.leaflabs.com/ <p>Sorry Perry, a fair comment. I am v. busy till mid/late September, but if I get some time, I'll try to look at some. I don't use Windows, so I can't help there.</p> <p>Where are the issues tracked or recorded? I only see 4 at github. </p> http://forums.leaflabs.com/topic.php?id=86#post-499 Wed, 07 Jul 2010 13:38:35 +0000 perry 499@http://forums.leaflabs.com/ <br /> http://forums.leaflabs.com/topic.php?id=86#post-497 Wed, 07 Jul 2010 11:10:18 +0000 perry 497@http://forums.leaflabs.com/ <p>Hi guys,</p> <p>Please bear with us. I'll try to deal with each issue as I get to it. I'm sorry about the delay, I have a day job and very little time to work on this in my spare time :*(</p> <p>As always, patches are always encouraged, we're trying to encourage a true open source project here... </p>