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Forum Index : Microcontroller and PC projects : MMB4L: MMBasic for Linux alpha release
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| lizby Guru  Joined: 17/05/2016 Location: United StatesPosts: 3008 |
Running and editing and rerunning the program listed above for flashing LEDs. It always works, but the extra characters appear on the prompt line. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
Thanks, I'll try and take a look over the weekend once I dust off a Pi Zero. Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
32-bit i686 build: https://github.com/thwill1000/MMB4L/blob/main/binaries/mmb4l-2021.01.00-a1-i686-glibc-2.17.tgz Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3008 |
Notes: in the .nanorc file, before the "include" statement, I put "set constantshow" so that the line number you are on in nano will be displayed. "set linenumbers" would number each line, but I haven't done that. I was very hopeful with > OPEN "COM1: baud=9600" AS #5 > but then: > PRINT #5, "Hello, MMB4L" Error: File number is not open That leads to the question, what is on your todo list? For better or worse, we have become accustomed to mmbasic developers not having other computing projects (or jobs) that might take away from developing toys for us greedy users. ;-} Personally, I'd like to see 1) serial comms; 2) JSON$; 3) the big one: HDMI output on the pi (which makes it a less generic Linux). This would enable such things as GPS, Lew's weather station, ESP-01 functions, and Tinine's (serial) bluetooth controllers, and serial communications to other 'mites. Some of that can probably be done now using the SYSTEM command and the ability to read and write files. Then all the other I/O goodies. All in all, great job, Tom. Thanks. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
TODO In no particular order within each section - and unfortunately I do have a "real" job that I have been neglecting and need to get back to. Required for version 1 release Add option to PAUSE controlling whether it nanosleeps or not - or an OPTION to MMBasic controlling all sleep behaviour Implement SEARCH PATH Implement command-line RUN shortcut '*' Ensure all Peter's "preprocessor tricks" implemented in programs and at command-line Allow program to be specified on Linux command-line when MMBasic is launched Implement variable/sub/function hash tables Make output from LS more like that of CMM2 Have another look at the other settings recommended for raw console mode Make all function keys reprogrammable Implement OPTION persistence Work through CMM2 manual implementing missing commands/functions Review all uses of void* Implement safety checks on PEEK/POKE calls - should these be optional ? - should address alignment of PEEK/POKE be optional ? Implement serial I/O Implement command-line shortcut for SYSTEM command, e.g. '!ls' Implement command-line path completion Implement support for ~ at start of paths Implement MM.INFO(EXITSTATUS) to retrieve exit code from SYSTEM command To infinity and beyond Build on macOS Rewrite pre-processor Implement SWAP - not difficult, just not urgent and not compatible with other MMs Integrate 'pigpio' with Raspberry Pi build High resolution graphics Best wishes, Tom Edited 2021-09-24 22:38 by thwill Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| Rado Regular Member  Joined: 27/11/2020 Location: CroatiaPosts: 59 |
How do you intend to use PEEK/POKE? If you run them in user space, they are fun, but can't do much. If you allow them in elevated privileges account, they might be really dangerous to use - crash the machine, steal other user's data, etc. There might be a better use for them to control /proc - and that would be fun, too. And dangerous with elevated privileges, too. :) |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
They will only work within the virtual address space of the MMB4L process, I'm not sure how you would do otherwise without explicit use of shared memory, and in any case it's not something that I consider sane. If you want to go crazy then there is the SYSTEM command. There will be a pair of options "OPTION PEEK UNSAFE" and "OPTION POKE UNSAFE" both by default "OFF". If these are OFF then PEEK/POKE will report an error when used outside of the areas of memory that MMB4L has allocated for variable storage and the BASIC heap. Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
This is a really cool project, Tom. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3008 |
Digital input and output on the Pi Zero W with MMB4L Youtube video: MMB4L digital input and output The code activates weak pullups. Pressing a button on the 4-button module pulls the pin low. The LEDs reflect the pin state. ' pin.bas -- digital I/O with MMB4L ' dim integer i,j,k,p(4)=(0,12,16,20,21) dim integer pState(16) dim integer q(4)=(0,25,8,7,1), dout=1, din=0 for i=1 to 4 setpin p(i),dout cmd$="sudo echo '1' > /sys/class/gpio/gpio"+str$(p(i))+"/value" system(cmd$) pause 500 next for i=1 to 4 setpin q(i),din cmd$="sudo echo '0' > /sys/class/gpio/gpio"+str$(p(i))+"/value" system(cmd$) pause 500 next do for i=1 to 4 open "/sys/class/gpio/gpio"+str$(q(i))+"/value" for input as #1 a$=input$(1,#1): close #1 ' 0 or 1 cmd$="sudo echo '"+a$+"' > /sys/class/gpio/gpio"+str$(p(i))+"/value" ' print cmd$ system(cmd$) next i pause 2000 loop sub setpin(pinno as integer, pinmode as integer) local string dirname$, cmd$ dirname$="/sys/class/gpio/gpio"+str$(pinno) if not MM.INFO(EXISTS DIR dirname$) then cmd$="sudo echo '"+str$(pinno)+"' > /sys/class/gpio/export 2>/dev/null" ' print cmd$ system(cmd$) endif if pinmode then cmd$="sudo echo 'out' > "+dirname$+"/direction" else cmd$="sudo echo 'in' > "+dirname$+"/direction" endif system(cmd$) end sub PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
The fact that that works is somewhat unexpected - I guess a side-effect of everything being a file. Innovative work @lizby, Tom. Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3008 |
Thanks. I had to check these things out with pi@raspberrypi:~ $ cat /sys/class/gpio/gpio12/direction in pi@raspberrypi:~ $ cat /sys/class/gpio/gpio12/value 0 pi@raspberrypi:~ $ echo "out" > /sys/class/gpio/gpio12/direction pi@raspberrypi:~ $ cat /sys/class/gpio/gpio12/direction out I forgot to mention that in order to get the "gpio" command (used for setting the weak pullup), I had to install WiringPi (sudo apt-get update; sudo apt-get install wiringpi). ~ Edited 2021-09-25 02:38 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
Thanks Mick. I rearranged the score but Geoff and Peter were the composers and it looks like Lance is making it dance. Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3008 |
When I tried to run the program I posted above after power-cycling, it failed. I realized that I had run it after getting equivalent code to run in a bash script. That had apparently initialized some things. I also realized that I had forgotten to put the weak pullup line into the MMB4L code. After inserting that line and fiddling, I realized that it had to run as root for the setup of the gpio to work. So, after starting with "sudo mmbasic", this now works: ' Pin.bas performs digital I/O with linux4MMB ' dim integer i,j,k,p(4)=(0,12,16,20,21) dim integer pState(16) dim integer q(4)=(0,25,8,7,1), dout=1, din=0 for i=1 to 4 setpin p(i),dout cmd$="sudo echo '1' > /sys/class/gpio/gpio"+str$(p(i))+"/value" system(cmd$) pause 500 next for i=1 to 4 setpin q(i),din cmd$="sudo echo '0' > /sys/class/gpio/gpio"+str$(p(i))+"/value" system(cmd$) pause 500 next do for i=1 to 4 open "/sys/class/gpio/gpio"+str$(q(i))+"/value" for input as #1 a$=input$(1,#1): close #1 ' 0 or 1 cmd$="sudo echo '"+a$+"' > /sys/class/gpio/gpio"+str$(p(i))+"/value" ' print cmd$ system(cmd$) next i pause 2000 loop sub setpin(pinno as integer, pinmode as integer) local string dirname$, cmd$ dirname$="/sys/class/gpio/gpio"+str$(pinno) if not MM.INFO(EXISTS DIR dirname$) then cmd$="sudo echo '"+str$(pinno)+"' > /sys/class/gpio/export 2>/dev/null" ' print cmd$ system(cmd$) endif dirname$=dirname$+"/direction" if pinmode then cmd$="sudo echo 'out' > "+dirname$ else cmd$="sudo echo 'in' > "+dirname$ system(cmd$) cmd$="gpio -g mode "+str$(pinno)+" up" ' set weak pullup endif ' ?pinno,cmd$ system(cmd$) end sub ~ Edited 2021-09-25 12:06 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2285 |
hi, have you tried: sudo adduser $USER gpio (from: https://raspberrypi.stackexchange.com/questions/40105/access-gpio-pins-without-root-no-access-to-dev-mem-try-running-as-root no guarantees, i don't have a RPi here to check the above, but it looks hopeful. cheers, rob :-) |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3649 |
Classic sign that the permissions are set to stop users doing potentially dangerous/naughty things (as you'd expect, that's the default). Rob's idea looks good, but if it doesn't work look at the owner of the gpio ports. John |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3008 |
pi@raspberrypi:~ $ sudo adduser $USER gpio The user `pi' is already a member of `gpio'. So no joy there. Thanks. How do I do that? I thought it might have been the "sudo"s in the code. Removing them all got further in the program, but it again died with a "permission" error. Oddly, if I reran, it got further, and after doing that 8 times, it ran fine. Running with "sudo mmbasic" also works fine with the "sudo"s in the code removed. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
It's not good to have to run MMBasic as root - even with sudo. There's no control over what might be connected to ports etc. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3008 |
Pi-Cromite always ran with "sudo mmbasic". No problems detected by me, and none that I know of reported. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
Tut Tut! The user should *never* need root access to run anything under linux. That's what it has a permissions system for. ;) It's why, on the RPi, the root account is disabled by default and you are pushed towards using sudo for the odd occasions where you need root access. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
It's not my area, but I've had the briefest of looks and it appears you are expected to have sudo priviliges to access the GPIO on the Pi. One possibility is to configure the pigpio daemon to run on startup with the necessary privileges and then communicate with the daemon as a normal user ... I'll leave that as an exercise for the reader. Possibly WiringPi has some similar workflow available. Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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