Hi Rob,

What is a "schp" ?

Regards

TK

Group: DynoMotion	Message: 10099	From: rjreese29@ymail.com	Date: 9/2/2014
Subject: Re: Pwm and logic levels

Hi Tom, Here is a bit better of a question. How would you go about gaining control over turning the below program on and off with a bit? The below program is working for me now, but I just cannot gain io control over it I will be also implementing externalbuttons.c , so I am thinking estop function in this program might help me get there easier. Use estop function in this program to also stop the stepaspwm.c from stepping. #include "KMotionDef.h" // Example showing how any of the 8 Step and Direction // frequency generators may be used as a PWM //STEP_RATE_ADD 0x3c - write a 32 bit word - Bit31=enable, Bit27=Drive, Bits24-26=chan, 0-23= signed fraction of 16.666MHz //STEP_PULSE_LENGTH_ADD 0x06 - write a 6 bit word - 0-63 = # of 16.666MHz clocks to this address #define CLOCK 16.6666e6 main() { double DutyCycle, Period; int Frequency; int Pulse=50; // Fixed pulse length of 50/16.66MHz = 2us int StepChan = 4; // KFLOP Step Gen 4 IO10 Pin 36 - when high(1), this turns on the C4 Safety Charge pump for supermax SetBitDirection(36,1); FPGA(STEP_PULSE_LENGTH_ADD) = Pulse; DutyCycle= 0.33; // Note Duty Cycle can't be zero (useful range 0.02 - 0.98) Period = Pulse/DutyCycle; Frequency = (int)(0x7FFFFF/Period); printf("DutyCycle=%f, Pulse=%d clocks, Period=%f clocks\n",DutyCycle,Pulse,Period); FPGA(STEP_RATE_ADD+0) = Frequency; // put 23 bit frequency FPGA(STEP_RATE_ADD+1) = Frequency>>8; FPGA(STEP_RATE_ADD+2) = Frequency>>16; FPGA(STEP_RATE_ADD+3) = 0x88 + StepChan; // combine enable, Drive High and low mode, channel } Thanks Tom!! Rob

Group: DynoMotion	Message: 10101	From: Tom Kerekes	Date: 9/2/2014
Subject: Re: Pwm and logic levels

Attachments : ChargePumpOnOff-10101.c Hi Rob, See attached program.  As long as ServiceChargePump() is being called (add to a forever loop in your Initialization Program) then turning on and off IO Bit 46 (KFLOP LED) should activate and deactivate the charge pump. Please attach C files to post in the future otherwise the formatting gets messed up in the email. HTH Regards TK Group: DynoMotion Message: 10102 From: Rjreese29 Date: 9/2/2014 Subject: Re: Pwm and logic levels [1 Attachment] Thanks Tom, I'll give it a go and see what happens (with my lack of c knowledge and abundance of curiosity/drive to get this done) I'll attach files next time. Unfortunately most of my posts are on my phone...  Ya, that looks terrible. Thanks so much for being so patient and your help! Rob On Sep 2, 2014, at 10:59 AM, "Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com> wrote:   Hi Rob, See attached program.  As long as ServiceChargePump() is being called (add to a forever loop in your Initialization Program) then turning on and off IO Bit 46 (KFLOP LED) should activate and deactivate the charge pump. Please attach C files to post in the future otherwise the formatting gets messed up in the email. HTH Regards TK Group: DynoMotion Message: 10150 From: Rjreese29 Date: 9/8/2014 Subject: Re: Pwm and logic levels [1 Attachment] Hi Tom, This file works great for my charge pump. I can control it now. Thanks. Currently it is pulsing appropriately and turning the pump on and allowing me to enable my system. The logic level is low though (on my logic probe and a voltage of .80vdc) Would it be possible to get a pulse and a logic level of high with adjustments to this c file? Thank you, Rob On Sep 2, 2014, at 10:59 AM, "Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com> wrote:   Hi Rob, See attached program.  As long as ServiceChargePump() is being called (add to a forever loop in your Initialization Program) then turning on and off IO Bit 46 (KFLOP LED) should activate and deactivate the charge pump. Please attach C files to post in the future otherwise the formatting gets messed up in the email. HTH Regards TK Group: DynoMotion Message: 10151 From: Tom Kerekes Date: 9/8/2014 Subject: Re: Pwm and logic levels Hi Rob, I suppose you read 0.8V because we are programming a duty cycle of 33%.  So an output of ~2.4V x 33% would be 0.8V on average. You might change the duty cycle to 50% instead but basically I think it should work ok. But actually the pulse length and polarity is a global thing.  I believe you have Step and Direction Drives so that should be the primary thing that determines the setting.  Remove this line so that the FPGA pulse length is only set in your Initialization Program and not changed by this charge pump code.         FPGA(STEP_PULSE_LENGTH_ADD) = Pulse; Whatever the Pulse length number is set to in the initialization program set the same value in this line so it computes the right frequency to get the specified duty cycle: Pulse=50 Regards TK From: "Rjreese29 rjreese29@... [DynoMotion]" <DynoMotion@yahoogroups.com> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com> Sent: Monday, September 8, 2014 4:52 PM Subject: Re: [DynoMotion] Re: Pwm and logic levels   Hi Tom, This file works great for my charge pump. I can control it now. Thanks. Currently it is pulsing appropriately and turning the pump on and allowing me to enable my system. The logic level is low though (on my logic probe and a voltage of .80vdc) Would it be possible to get a pulse and a logic level of high with adjustments to this c file? Thank you, Rob On Sep 2, 2014, at 10:59 AM, "Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com> wrote:   Hi Rob, See attached program.  As long as ServiceChargePump() is being called (add to a forever loop in your Initialization Program) then turning on and off IO Bit 46 (KFLOP LED) should activate and deactivate the charge pump. Please attach C files to post in the future otherwise the formatting gets messed up in the email. HTH Regards TK From: "rjreese29@... [DynoMotion]" <DynoMotion@yahoogroups.com> To: DynoMotion@yahoogroups.com Sent: Tuesday, September 2, 2014 6:51 AM Subject: [DynoMotion] Re: Pwm and logic levels   Hi Tom, Here is a bit better of a question. How would you go about gaining control over turning the below program on and off with a bit? The below program is working for me now, but I just cannot gain io control over it I will be also implementing externalbuttons.c , so I am thinking estop function in this program might help me get there easier. Use estop function in this program to also stop the stepaspwm.c from stepping. #include "KMotionDef.h" // Example showing how any of the 8 Step and Direction // frequency generators may be used as a PWM //STEP_RATE_ADD 0x3c - write a 32 bit word - Bit31=enable, Bit27=Drive, Bits24-26=chan, 0-23= signed fraction of 16.666MHz //STEP_PULSE_LENGTH_ADD 0x06 - write a 6 bit word - 0-63 = # of 16.666MHz clocks to this address #define CLOCK 16.6666e6 main() { double DutyCycle, Period; int Frequency; int Pulse=50; // Fixed pulse length of 50/16.66MHz = 2us int StepChan = 4; // KFLOP Step Gen 4 IO10 Pin 36 - when high(1), this turns on the C4 Safety Charge pump for supermax SetBitDirection(36,1); FPGA(STEP_PULSE_LENGTH_ADD) = Pulse; DutyCycle= 0.33; // Note Duty Cycle can't be zero (useful range 0.02 - 0.98) Period = Pulse/DutyCycle; Frequency = (int)(0x7FFFFF/Period); printf("DutyCycle=%f, Pulse=%d clocks, Period=%f clocks\n",DutyCycle,Pulse,Period); FPGA(STEP_RATE_ADD+0) = Frequency; // put 23 bit frequency FPGA(STEP_RATE_ADD+1) = Frequency>>8; FPGA(STEP_RATE_ADD+2) = Frequency>>16; FPGA(STEP_RATE_ADD+3) = 0x88 + StepChan; // combine enable, Drive High and low mode, channel } Thanks Tom!! Rob