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Hi, This is a 56F80x issue, and it's a rather speculative question for the group. Does anyone have any comments on the feasibility of re-using the PWM fault inputs as extra General Purpose Digital Inputs? Has anyone ever tried this? It seems like it might provide an additional source of "free" input pins for applications that use a lot of GPIO. Any comments are welcome. Thanks, Bill Yochum |
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Using PWM fault inputs as General Digital Inputs?
Started by ●September 23, 2002
Reply by ●September 24, 20022002-09-24
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Yes, we use them quite often as General Purpose Digital Inputs. We set the
PWM Disable Mapping Registers (PWMDISMAP1-2) to all zero (so the PWM ignores the Fault0-3 inputs), and read from the PWM Port Register (PMPORT). This is explained in Sections 11.7.9 and 11.7.12 in the DSP56F80x User's Manual. Example code is shown below. // Digital input data from PWMA current status and fault inputs: // Bit 6 = ISA2 // Bit 5 = ISA1 // Bit 4 = ISA0 // Bit 3 = FAULTA3 // Bit 2 = FAULTA2 // Bit 1 = FAULTA1 // Bit 0 = FAULTA0 UWord16 PwmA_dig_inputs; // Disable all fault mapping for PWMA ArchIO.PwmA.DisableMapping1Reg = 0; ArchIO.PwmA.DisableMapping2Reg = 0; // Read the PWMA digital inputs from the PMPORT register PwmA_dig_inputs = ArchIO.PwmA.PortReg; 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: Yochum, William [mailto:] Sent: Monday, September 23, 2002 9:03 AM To: Subject: [motoroladsp] Using PWM fault inputs as General Digital Inputs? Hi, This is a 56F80x issue, and it's a rather speculative question for the group. Does anyone have any comments on the feasibility of re-using the PWM fault inputs as extra General Purpose Digital Inputs? Has anyone ever tried this? It seems like it might provide an additional source of "free" input pins for applications that use a lot of GPIO. Any comments are welcome. Thanks, Bill Yochum _____________________________________ 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/ |
