https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545596#M13104 <HTML><HEAD></HEAD><BODY><SPAN>bump</SPAN></BODY></HTML> Sun, 19 Jun 2016 01:13:29 GMT lpcware 2016-06-19T01:13:29Z https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545595#M13103 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I have a LPCxpresso1549 board and I'm new to LPC MCUs.</P><P>I'm desperately looking for a tutorial / code example / application note which shows how to capture an audio or other signal (mono or several channels) with a given sample rate and a given numer of samples corresponding to a certain duration.</P><P>It would be great if the ADC is coupled with DMA so that the captured signal is stored in a given SRAM array in the background without any CPU load.</P><P>Perhaps the whole recording process can be controlled and triggered by a SCT in the background?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>My use case:</P><P>The LPC1549 has two fast ADCs with 2 MSample/s and I want to record a mono and stereo signals with at least 500kS/s, so this should be easily possible. I need to sample 1024 points and want to do a FFT and other signal processing afterwards.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I'm pretty shure that thousands of engineers have the same or similar use case, so please, dear NXP support, provide us with an example or application note on this topic</P></BODY></HTML> Fri, 17 Jun 2016 13:02:45 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545595#M13103 martinlorenz 2016-06-17T13:02:45Z https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545596#M13104 <HTML><HEAD></HEAD><BODY><SPAN>bump</SPAN></BODY></HTML> Sun, 19 Jun 2016 01:13:29 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545596#M13104 lpcware 2016-06-19T01:13:29Z https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545597#M13105 <HTML><HEAD></HEAD><BODY><P>Do NXP people read this forum?</P><P>I would be glad to hear a comment from them.</P></BODY></HTML> Mon, 25 Jul 2016 08:57:39 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545597#M13105 martinlorenz 2016-07-25T08:57:39Z https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545598#M13106 <HTML><HEAD></HEAD><BODY><P>Hi </P><P>there is not a sample like you need but you can check all the samples on the </P><H1 style="font-family: Lato, Arial, sans-serif; font-weight: 400; color: #333333; font-size: 26px;"><A href="http://www.nxp.com/products/software-and-tools/hardware-development-tools/lpcxpresso-boards/lpcopen-software-development-platform-lpc15xx:LPCOPEN-SOFTWARE-FOR-LPC15XX?code=LPCOPEN-SOFTWARE-FOR-LPC15XX&amp;nodeId=0152101A027D8D">LPCOpen Software Development Platform LPC15XX</A>​</H1><P></P><P>I hope this will help you.</P><P>Regards </P><P>Vicente Gomez</P></BODY></HTML> Tue, 26 Jul 2016 21:30:57 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545598#M13106 vicentegomez 2016-07-26T21:30:57Z https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545599#M13107 <HTML><HEAD></HEAD><BODY><P>Easy enough to make the ADC sample at any given frequency just by setting Burst (bit 27) in the SEQA control register so that it runs continuously, and then choosing a value for CLKDIV (bits 0:7 of CTRL) so that it runs at the required speed, but why such a high sample rate? A 1024 point FFT at 500kSamples/second isn't going to show anything below 500Hz.</P></BODY></HTML> Mon, 26 Sep 2016 19:42:58 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545599#M13107 ianbenton 2016-09-26T19:42:58Z https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545600#M13108 <HTML><HEAD></HEAD><BODY><P>Why such a high sample rate?</P><P>Off course we don't have an ordinary audio application.</P><P>But we want to measure ultrasonic signals at frequencies far above 20kHz.</P><P>And therefore we need such high sample rates!</P></BODY></HTML> Fri, 07 Oct 2016 06:14:26 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Audio-signal-recording-with-ADC-and-DMA/m-p/545600#M13108 martinlorenz 2016-10-07T06:14:26Z