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sarfata / pi-blaster

PWM on the Raspberry pi - done properly (in hardware, stable)
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Error at raspberry pi 3 #89

Open Temeteron opened 7 years ago

Temeteron commented 7 years ago

I am using this library via a tutorial, which is working for everyone but me. So i thought that the problem is probably at the pi-blaster library.

After running: ./pi-blaster 22 && echo "22=1" > /dev/pi-blaster where pi-blaster is the executable of the pi-blaster.c, i got the following output:

Using hardware: PWM
Number of channels: 1
PWM frequency: 100 Hz
PWM steps: 1000
Maximum period (100 %): 10000us
Minimum period (0.100%): 10us
pi-blaster: Page 0 not present (pfn 0xa100000000016864)

I am not understanding what is the meaning of the last line. ???

By trying the command: echo "22=1" > /dev/pi-blaster i got no output and the servo motor didn't work.

Thanks in advance

Temeteron commented 7 years ago

I found the problem. The tutorial i was using probably had an older version of this library.

Nevertheless, please comment about the meaning of the last line of the output: pi-blaster: Page 0 not present (pfn 0xa100000000016864)

mvelebit commented 6 years ago

Could you post the fix which you utilized? Thanks in advance

Temeteron commented 6 years ago

This worked for me:

echo "0=0.1" > /dev/pi-blaster

A full running example on an aquarium can be found here, which contains an implementation that combines some of the tutorials of resin. More specifically a nodeJs server with a frontend and the pi-blaster module to control a servo motor through a web page and eventually feed your fishes.

polymathuk commented 3 years ago

I am having the exact same problem. The command outputs:

Using hardware:                   PWM
Number of channels:                 1
PWM frequency:                 100 Hz
PWM steps:                       1000
Maximum period (100  %):      10000us
Minimum period (0.100%):         10us
pi-blaster: Page 0 not present (pfn 0xa100000000015c1e)

The file pi-blaster.c contains a function make_pagemap(void) which I assume generates the error line, but I have no idea what it means. I'm not getting a process running in top for pi-blaster and assigning values like: echo "1=0.2" > /dev/pi-blaster has no effect on the actual pins. Using a 1.12 Pi from 2011