http://forums.leaflabs.com/topic.php?id=74079 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:04:48 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=74079#post-104831 Tue, 29 Oct 2013 05:41:11 +0000 ventosus 104831@http://forums.leaflabs.com/ <p>@fb44</p> <p>The sampling of the ADC is by default configured to be triggered by software, but you can configure it to be triggered by a timer.</p> <p>You have to use libmaple for that though. Here some keywords to look for in this forum and in the libmaple/wirish sources.</p> <p>e.g. use:<br /> <code><br /> adc_set_extsel(dev, ADC_EXT_EV_TIM1_CC1); // trigger by channel1 of timer1<br /> </code><br /> when initializing the ADC peripheral instead of:<br /> <code><br /> adc_set_extsel(dev, ADC_EXT_EV_SWSTART);<br /> </code></p> <p>To get a notice about the end of conversion, you may want to<br /> - monitor the end-of-conversion status flag (ADC_SR_EOC)<br /> - set up an ADC interrupt (void __adc_irq(void))<br /> - or use DMA if you want to sample more than one ADC channel </p> http://forums.leaflabs.com/topic.php?id=74079#post-104828 Mon, 28 Oct 2013 16:05:40 +0000 ftb44 104828@http://forums.leaflabs.com/ <p>Hi everyone,</p> <p>I am about to use the Maple in a project with a little bit of DSP, and I am worried about the fact that I can only sample once per analogRead(). To me this suggests that my sample rate might not be constant! Has anyone written anything that could work around this non-determinism? I know that the Maple is capable of incredibly fast analog reads, and I have a few ideas on how to stabilize the time between samples--but I feel like there must be better coders out there who have already solved this problem. </p>