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Discussion Groups | Piclist | sampling frequency
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
Re: [fpga-cpu] Xilinx bitgen problem - Guil...@h... - Jan 4 20:04:00 2001
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Hi! Maybe what I'm going to said is stupid, but "the clk has no source".... What clk is that??? Are you using the fpga external clock??? If you are not, I think you my try it, by using pin 13. That's what I think... sorry if it's dumb... hehe ;P Thanks for listening... Jorge, Guilherme ----- Original Message ----- From: "Bharath Kumar" <bharath.kumar@w...> To: <f...@egroups.com> Sent: Thursday, January 04, 2001 6:58 AM Subject: [fpga-cpu] Xilinx bitgen problem > hi All, > I tried my first design using design manager yesterday... > I was able to succesfully complete the flow upto Place and Route(PAR).... but > "Bitgen" is giving some problem as follows: > **************************************************************************** ********* > Running DRC > ERROR:DesignRules:368 - Netcheck: Sourceless. Net clk has no source. > ERROR:DesignRules:10 - Netcheck: The signal "clk" is completely unrouted. > **************************************************************************** ************* > > I couldnt get the exact meaning of the above message...Please help me. > > thanks and Regards, > Bharath > Bangalore, INDIA > > > [Non-text portions of this message have been removed] > To Post a message, send it to: f...@eGroups.com > To Unsubscribe, send a blank message to: f...@eGroups.com |
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Re: [fpga-cpu] Xilinx bitgen problem - Guil...@h... - Jan 4 20:04:00 2001
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Hi! Maybe what I'm going to said is stupid, but "the clk has no source".... What clk is that??? Are you using the fpga external clock??? If you are not, I think you my try it, by using pin 13. That's what I think... sorry if it's dumb... hehe ;P Thanks for listening... Jorge, Guilherme ----- Original Message ----- From: "Bharath Kumar" <bharath.kumar@w...> To: <f...@egroups.com> Sent: Thursday, January 04, 2001 6:58 AM Subject: [fpga-cpu] Xilinx bitgen problem > hi All, > I tried my first design using design manager yesterday... > I was able to succesfully complete the flow upto Place and Route(PAR).... but > "Bitgen" is giving some problem as follows: > **************************************************************************** ********* > Running DRC > ERROR:DesignRules:368 - Netcheck: Sourceless. Net clk has no source. > ERROR:DesignRules:10 - Netcheck: The signal "clk" is completely unrouted. > **************************************************************************** ************* > > I couldnt get the exact meaning of the above message...Please help me. > > thanks and Regards, > Bharath > Bangalore, INDIA > > > [Non-text portions of this message have been removed] > To Post a message, send it to: f...@eGroups.com > To Unsubscribe, send a blank message to: f...@eGroups.com |
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Re: [BasicX] New file uploaded to basicx - Rais...@y... - Apr 25 19:40:00 2001
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you don't know where i can get a neon sign transformer do you? ----- Original Message ----- From: Westhoff To: b...@yahoogroups.com Sent: Wednesday, April 25, 2001 7:17 PM Subject: Re: [BasicX] New file uploaded to basicx The schematic is labeled as a 20KVolt supply. That is quite high for electrolysis of water and would need a large amount of current. The easiest way to do this is to get an old neon sign transformer the larger the better. They will produce the high voltage at a fairly high current. However, you could easily KILL yourself with a supply of this type. 20KVolts will jump about an inch gap and maintain an arc at an even larger distance. I don't think it is a proper application for electrolysis of water. Raistlin Majere wrote: > do you know where these parts can be purchased from so that i can build it? > ----- Original Message ----- > From: GTBecker@R... > To: b...@yahoogroups.com > Sent: Tuesday, April 24, 2001 2:19 PM > Subject: Re: [BasicX] New file uploaded to basicx > > > a file has been uploaded to the Files area of the basicx group. > > That's a ~10kVDC power supply, powered by 12VDC. Schematic components to the > left of the transformer core are those of a blocking oscillator; on the right, > half-wave rectifier and smoothing capacitor. > > This might be an automobile neon supply or maybe an afterburner ignitor... > > Tom Becker > --... ...-- > GTBecker@R... GTBecker@O... > The RighTime Clock Company, Inc., Cape Coral, Florida USA > www.RighTime.com > > Yahoo! Groups Sponsor Yahoo! Groups Sponsor Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [Non-text portions of this message have been removed] |
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Re: [BasicX] New file uploaded to basicx - Rais...@y... - Apr 25 19:40:00 2001
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you don't know where i can get a neon sign transformer do you? ----- Original Message ----- From: Westhoff To: b...@yahoogroups.com Sent: Wednesday, April 25, 2001 7:17 PM Subject: Re: [BasicX] New file uploaded to basicx The schematic is labeled as a 20KVolt supply. That is quite high for electrolysis of water and would need a large amount of current. The easiest way to do this is to get an old neon sign transformer the larger the better. They will produce the high voltage at a fairly high current. However, you could easily KILL yourself with a supply of this type. 20KVolts will jump about an inch gap and maintain an arc at an even larger distance. I don't think it is a proper application for electrolysis of water. Raistlin Majere wrote: > do you know where these parts can be purchased from so that i can build it? > ----- Original Message ----- > From: GTBecker@R... > To: b...@yahoogroups.com > Sent: Tuesday, April 24, 2001 2:19 PM > Subject: Re: [BasicX] New file uploaded to basicx > > > a file has been uploaded to the Files area of the basicx group. > > That's a ~10kVDC power supply, powered by 12VDC. Schematic components to the > left of the transformer core are those of a blocking oscillator; on the right, > half-wave rectifier and smoothing capacitor. > > This might be an automobile neon supply or maybe an afterburner ignitor... > > Tom Becker > --... ...-- > GTBecker@R... GTBecker@O... > The RighTime Clock Company, Inc., Cape Coral, Florida USA > www.RighTime.com > > Yahoo! Groups Sponsor Yahoo! Groups Sponsor Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [Non-text portions of this message have been removed] |
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Exceptions occur while debugging thru JTAG - Leig...@y... - Oct 28 10:34:00 2004
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While I'm debugging a device running a single EINT as FIQ and timers & uart through IRQ, I tend to get exceptions (undef, swi, prefetch, data) occuring randomly while I'm stepping through the code. Currently, I don't have any code done for these exceptions. I've also experienced data aborts whenever I use the JTAG to download, & debug code. I reverted back to ISP downloading (serial port) because of this. However, the JTAG doesn't seem to be crashing as the JTAG always shows the PC excecuting the undefined exception vectors. So, I'm not sure what could be causing these exceptions to happen. Any ideas/suggestions? best regards, Leighton |
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Exceptions occur while debugging thru JTAG - Leig...@y... - Oct 28 10:34:00 2004
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While I'm debugging a device running a single EINT as FIQ and timers & uart through IRQ, I tend to get exceptions (undef, swi, prefetch, data) occuring randomly while I'm stepping through the code. Currently, I don't have any code done for these exceptions. I've also experienced data aborts whenever I use the JTAG to download, & debug code. I reverted back to ISP downloading (serial port) because of this. However, the JTAG doesn't seem to be crashing as the JTAG always shows the PC excecuting the undefined exception vectors. So, I'm not sure what could be causing these exceptions to happen. Any ideas/suggestions? best regards, Leighton |
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sampling frequency - emr uygur - Jan 25 17:25:00 2005
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Hi,
I want to increase sampling frequency during analog to
digital conversion. i am using ccs c compiler and i could not find any function for this.
Any help from anyone is much appreciated.
Thanks.
Emrah UYGUR
ALL-NEW Yahoo! Messenger - all new features - even more fun! |
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Re: sampling frequency - mikerey35475 - Jan 27 21:28:00 2005
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--- In , emr uygur <emruygur@y...> wrote: > Hi, > > I want to start my analog digital conversion with a sampling frequency of 1 Khz and few minutes later i must increase it to 2 Khz and it goes on. > I need help about the increasing sampling frequency, i do not know how to do this??? > Thanks for your interest.. > --------------------------------- > ALL-NEW Yahoo! Messenger - all new features - even more fun! If you are using a PIC with an A/D converter you can generate an interrupt on timer 0 or timer 1 overflow. Write an Interrupt Service Routine that starts your conversion, wait for conversion to complete, return to your main program and await the next interrupt. Since you do not mention which PIC you are using (or even if you using a PIC at all) it is hard to give much more of an answer. But let's say you are using a 16F877, then read the data sheet DS30292C staring at page 47 thru page 56. This covers timer 0, timer 1, and timer 2 and explains how to set-up the timer for generating the interrupt and presetting the timer to generate the interrupt at the correct time. The Mid-Range Refernce Guide DS31011A, also has info on timers in it. Read sections 11 thru 13 to get info on all three timers and how to set them up. Both of the documents are available at http://www.microchip.com Another good reference is Myke Predko's book Programming and Customizing PICmicro Controllers. Interrupts and timers are covered starting on page 196. Mike |
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