LeafLabs Garden » Topic: PPM reader

LeafLabs Garden » Topic: PPM reader http://forums.leaflabs.com/topic.php?id=84 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:23:30 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://forums.leaflabs.com/search.php bnewbold on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-609 Fri, 23 Jul 2010 11:26:19 +0000 bnewbold 609@http://forums.leaflabs.com/ (0.0.6 released: <a href="http://leaflabs.com/2010/07/ide-0-0-6-release-horray/" rel="nofollow">http://leaflabs.com/2010/07/ide-0-0-6-release-horray/</a> ) Nate on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-577 Mon, 19 Jul 2010 14:13:55 +0000 Nate 577@http://forums.leaflabs.com/ Thanks for your hard work! I am really looking forward to 0.0.6. I will need to use a PWM out signal on one of the pins (already coded using timer 4). Will I be able to use timer interrupts on timers 1-3 without disabling timer 4? As far as suggestions, my vote goes to enabling attach (and detach) external interrupt functions, but I think getting release 0.0.6 out sooner with working timer interrupts would be best. Just my 2 cents. Thanks! bnewbold on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-571 Mon, 19 Jul 2010 00:14:38 +0000 bnewbold 571@http://forums.leaflabs.com/ Sigh, 0.0.6 didn't make it out this weekend. I spent all day hacking on the SerialUSB blocking issue and ended up with a partial solution, but still need to test and write it up. New target is Wednesday evening... ;( bnewbold on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-557 Thu, 15 Jul 2010 08:35:17 +0000 bnewbold 557@http://forums.leaflabs.com/ Hey Nate! My current timers code is on this branch: <a href="http://github.com/leaflabs/libmaple/tree/timers" rel="nofollow">http://github.com/leaflabs/libmaple/tree/timers</a> Caveats that I need to test/document are that configuring the timers will disable certain other functionality (especially PWM, which is itself implemented using the timers), and that the USB, Serial, and SysTick interrupts tend to conflict with the Timer interrupts making them a bit unreliable. There are notes in ./notes/timers and see ./example/test-timers.cpp for example code. We might also make API/functionality changes before release... any comments or suggestions would be appreciated! We were hoping to do 0.0.6 last night but are a bit behind; i'll be very disappointed if it isn't tested and out the door this weekend. Nate on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-551 Wed, 14 Jul 2010 17:28:18 +0000 Nate 551@http://forums.leaflabs.com/ I need to measure the frequency of an incoming TTL signal. Any help would be appreciated. Also, a couple of questions: 1. Can I get a hold of the untested code supporting timers (see last post)? 2. Any word on the release date of 0.0.6? Thanks for your help. poslathian on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-481 Mon, 05 Jul 2010 20:39:20 +0000 poslathian 481@http://forums.leaflabs.com/ I should also mention, that you can feel free to dig into hacking on libmaple and submitting patches, but I warn you that the timers on the stm32 are nastily complicated. Stay tuned though, last time I checked timer support was checked in but untested. poslathian on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-480 Mon, 05 Jul 2010 20:37:48 +0000 poslathian 480@http://forums.leaflabs.com/ pulseIn just moved up in the queue! In other news, timer interrupt support exists and is coming in 0.0.6, which may help you here too. We depend on users to figure out where to best spend our porting and expansion efforts, so thanks for the update! Ill post again here soon with an update on pulsein support leaflabsandy on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-472 Mon, 05 Jul 2010 15:07:48 +0000 leaflabsandy 472@http://forums.leaflabs.com/ 8/5/10 I got some bad news if this website docs are correct ... Under the Leaflabs docs "Maple-Arduino Compatability" pulseIn() unimplemented: On the TODO list! <------------<<<<<<< On the interrupts - I think they are still "work in progress" alduxvm on "PPM reader" http://forums.leaflabs.com/topic.php?id=84#post-470 Mon, 05 Jul 2010 11:59:38 +0000 alduxvm 470@http://forums.leaflabs.com/ Hi!! In my last project, i had the requirement to read a PPM channel coming from a RC receiver. In the arduino i use the timer1 with this code: ---------------------------------------- void setup_timer1(){ //Desactivar todas las interrupciones | disable all interupts TIMSK1 &= ~( _BV(TOIE1) | _BV(ICIE1) | _BV(OCIE1A) | _BV(OCIE1B)); //Fijar modo del timer | set timer mode TCCR1A &= ~( _BV(WGM11) | _BV(WGM10) ); TCCR1B &= ~( _BV(WGM12) | _BV(WGM13) | _BV(ICNC1)); //Capturar flanco de subida | capture raising edge TCCR1B |= _BV(ICES1); //capture raising edge //Prescaler 1/8 TCCR1B |= _BV(CS11); TCCR1B &= ~( _BV(CS12) | _BV(CS10) ); //Desactivar salidas | disable outputs TCCR1A &= ~( _BV(COM1A0) | _BV(COM1A1) | _BV(COM1B0) | _BV(COM1B1)); //Activar interrupcion de captura | enable capture interrupt TIMSK1 |= (1<<ICIE1); } ISR(TIMER1_CAPT_vect){ //static unsigned int lasticr; //icr at last caputre static unsigned char cserinp; //Entrada actual de servo | current input servo unsigned int licr; //TCCR1B ^= _BV(ICES1); //licr=ICR1-lasticr; //lasticr=ICR1; // TCNT1=0; if(ICR1>10000){ //Pulso muy largo, comenzar con nuevo frame | pulse too long, means start of new frame cserinp=0; }else{ //Pulso correcto, guardar medicion, ir al siguiente canal | pulse good, take reading, go to next channel serinp[cserinp]=((ICR1/2)); cserinp++; } TCNT1=0; } -------------------------------------- Im using interrupts to make it more efficient... the array "serinp" contains all the data from the 6 channels of my receiver. My question is, how to do this in the marvelous Maple?? because im updating all my project to the maple.... Any ideas?? has anyone ported the pulseIn function?? thanks!! cheers!!