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Yes, there is
a very good description about how to implement this feature in Application Note
AN1933/D.
Art
Johnson
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Yes, there is
a very good description about how to implement this feature in Application Note
AN1933/D.
Art
Johnson
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A convienent feature built into the chip is the usage of Quad timers C2
and C3. If you can setup a PWM unit as your base time, the
ADC's can be triggered to start a conversion using timers C2 and C3.
Then, a single interrupt routine can be used to read the conversion results,
process the data, and start the DAC update process. I do not use the EVM
SPI based DAC, but use the ADC data in this way.
Jerry.
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Motorola has 2 excellent Application Notes about the ADCs: AN1933/D "Synchronizing of On-Chip Analog to Digital Converter on DSP56F80x DSPs" AN1947/D "DSP56800 ADC" You can get them at: http://e-www.motorola.com/brdata/PDFDB/docs/AN1933.pdf http://e-www.motorola.com/brdata/PDFDB/docs/AN1947.pdf Motorola has many links to Application Notes for the DSP56F80x DSP chips, just go to their website at: http://e-www.motorola.com/webapp/sps/site/homepage.jsp?nodeIdM0ylgz6wY Then select the chip you are using (for example, DSP56F805): - In the Search area (top right) enter DSP56F805 and press Go - Click on the link to "DSP56F805 Product Summary Page" - On this page scroll down to "DSP56F805 Documentation" - You will see a section titled "Application Note", this has links to all the Application Notes that apply to the DSP56F805 chip I hope this helps. Regards, Art Johnson Senior Systems Analyst PMC Prime Mover Controls Inc. 3600 Gilmore Way Burnaby, B.C., Canada V5G 4R8 Phone: 604 433-4644 FAX: 604 433-5570 Email: http://www.pmc-controls.com -----Original Message----- From: swaroop [mailto:] Sent: Wednesday, September 25, 2002 6:48 AM To: Subject: [motoroladsp] Question about timers of 56F807 hi Iam working with the ADCs and DAC of a DSP56F807 EVM. I want to use two Quadrature timers for the 2 ADCs to retrieve the samples through the conversion complete callback functions .....n two auxillary timers for giving the digtal signal to the DAC to two different channels through two timer ISRs. then how should i design all these timers such that i can go through all the process without missing any step...i.e retrieving the signals from adc, processing it and then giving it back to the dacs.... At how much frequencies i should sample my incoming signals and what are the priorities i should give to my interrupts.....like callbacks n timerISRs......... How should I go ahead actually... this might be a simple thing for u all knowledgeable guys.... but iam very novice to this field.... please give me a helping hand to me... thanks in advance... swaroop _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/motoroladsp More Groups: http://www.dsprelated.com/groups.php3 ">http://docs.yahoo.com/info/terms/ |
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hi Iam working with the ADCs and DAC of a DSP56F807 EVM. I want to use two Quadrature timers for the 2 ADCs to retrieve the samples through the conversion complete callback functions .....n two auxillary timers for giving the digtal signal to the DAC to two different channels through two timer ISRs. then how should i design all these timers such that i can go through all the process without missing any step...i.e retrieving the signals from adc, processing it and then giving it back to the dacs.... At how much frequencies i should sample my incoming signals and what are the priorities i should give to my interrupts.....like callbacks n timerISRs......... How should I go ahead actually... this might be a simple thing for u all knowledgeable guys.... but iam very novice to this field.... please give me a helping hand to me... thanks in advance... swaroop |
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