01-17-2018, 11:06 PM
130, and thew screen locker locks forever , only usable for a few minutes after a reset button reboot, I have finally gotten the locking stopped, but now the screensaver doesn't work either.
I bought these two rock64's intending to replace a pi that throws away keyboard and mouse events, while running this kernel, 4.4.4-rt9-v7+ #7 SMP PREEMPT RT Mon Mar 7 14:53:11 UTC 2016 armv7l GNU/Linux
but otherwise is running a raspbian jessie quite well. Unfortunately those missed keyboard/mouse events can leave a 1500 lb machine moving something rapidly, until it runs into the end of the mechanics. Or worse yet, runs a cutting tool into a chuck that might be spinning 900 rpm. Thats 40 lbs of spinning steel and it will be damaged at a minimum, which might be a $1000 repair.
So I need two things, the first of which I have, but haven't built and installed, which is the latest rt-kernel. Then I need to find out if the SPI is fast enough using the kernels driver. We have a user-space SPI driver for the pi's that writes 32 bit packets at 42 megabaud, and then reads the 32 bit responses at 25 megabaud. Repeat 1000 times a second. Much slower than that and the position commands, buy the time they are echo'd back to the control program, are too stale and the control program thinks there is a following error in the hardware.
So theres two problems I need to fix before I can run metal carving machinery with it. The kernels spi driver has been said to do about 10 megabaud, and that just won't cut it. But I have to try.
Cheers, gene83
I bought these two rock64's intending to replace a pi that throws away keyboard and mouse events, while running this kernel, 4.4.4-rt9-v7+ #7 SMP PREEMPT RT Mon Mar 7 14:53:11 UTC 2016 armv7l GNU/Linux
but otherwise is running a raspbian jessie quite well. Unfortunately those missed keyboard/mouse events can leave a 1500 lb machine moving something rapidly, until it runs into the end of the mechanics. Or worse yet, runs a cutting tool into a chuck that might be spinning 900 rpm. Thats 40 lbs of spinning steel and it will be damaged at a minimum, which might be a $1000 repair.
So I need two things, the first of which I have, but haven't built and installed, which is the latest rt-kernel. Then I need to find out if the SPI is fast enough using the kernels driver. We have a user-space SPI driver for the pi's that writes 32 bit packets at 42 megabaud, and then reads the 32 bit responses at 25 megabaud. Repeat 1000 times a second. Much slower than that and the position commands, buy the time they are echo'd back to the control program, are too stale and the control program thinks there is a following error in the hardware.
So theres two problems I need to fix before I can run metal carving machinery with it. The kernels spi driver has been said to do about 10 megabaud, and that just won't cut it. But I have to try.
Cheers, gene83
