 | | Swan scheduling bug?
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I'm starting to use the swan firmware and I'm having a problem with the scheduling. It seems like a task with a long wait does not yield properly to other tasks. Here the NQC code sample: task taska() { WaitMS(150); AddToDatalog(9900); } task main() (...) (19 years ago, 22-Sep-05, to lugnet.robotics.rcx)
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| | pbrick and firmware
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Palm 130, pbrick, rcx 1.0 Can the palm 130 with pbrick be used to control an rcx that doesn't have firmware downloaded? My suspicion is that it won't work without the firmware. Tammy (19 years ago, 22-Sep-05, to lugnet.robotics.rcx)
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| | Re: time sampling under the rcx standard OS
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(...) Here's a code byte from my LegWay code. ---- int MotorSpeedArray[32] = {1,3,2,0}; // Speeds // ... later in the program... if (sys_time>CheckTime) // check system timer - is it time to check sensors again? { L1 = ReadSensor(SENSOR_1); L3 = (...) (19 years ago, 21-Sep-05, to lugnet.robotics.rcx.nqc)
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| | Re: time sampling under the rcx standard OS
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Hi Steve, As I'm quite new to BrickOS and to C programming, I'm sorry I'm not sure I understood what you meant, neither how you do this : (...) - Do you check the sensor at a higher rate, and only send a command to the motor at 1kHz ? - How do you (...) (19 years ago, 21-Sep-05, to lugnet.robotics.rcx.nqc)
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| | position servoing under BrickOS
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Thanks to your advices, Dick, Matt, and Steve, I've been very happy to solve my time sampling problems, installing BrickOS, which runs the rcx fast enough to get a proper position servoing (using rotation or light sensor, and a PID controller). I (...) (19 years ago, 20-Sep-05, to lugnet.robotics.rcx)
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| | error in using brickOS under Bricx Command Center
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Dear all, I am new to Lego Mindstorms programming. Recently I installed Bricx Command Center in Windows XP Home following the instructions in (URL) I am able to use NQC and leJOS but not brickOS under Bricx Command Center. (Downloading the brickOS (...) (19 years ago, 17-Sep-05, to lugnet.robotics.rcx.legos)
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| | Re: time sampling under the rcx standard OS
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(...) Well, in BrickOS, my loops usually execute at > 1kHz, so I usually just set it to check the sensor, and set the motor every 1ms. So it just keeps checking the clock. (...) Yes. There's an option that lets you download an "SREC" type of file. I (...) (19 years ago, 19-Sep-05, to lugnet.robotics.rcx.nqc)
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| | Re: time sampling under the rcx standard OS
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(...) Sorry, I didn't explain. This program only aims at checking the loop frequency capability of the rcx firmware, implementing a PWM. The rotation sensor is only used as a potentiometer knob, allowing me to determine by hand the PWM pulse as (...) (19 years ago, 19-Sep-05, to lugnet.robotics.rcx.nqc)
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| | Re: time sampling under the rcx standard OS
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Thank you Matt, the RCX loops much faster with your advices : about 10 loops per second. But as this frequency depends on the calculations included in the loop, I’m afraid this will not be enough. So I tried to download (URL) but it just appears as (...) (19 years ago, 18-Sep-05, to lugnet.robotics.rcx.nqc)
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| | Re: time sampling under the rcx standard OS
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Thank you Dick, for advicing me to switch to the faster firmware, I’m sure I need both a 1-millisecond basic clock, and the 128 power level capability. So I tried to download it from (URL) but it just appears as a text file, which I don’t know how (...) (19 years ago, 18-Sep-05, to lugnet.robotics.rcx.nqc)
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