Re: [9fans] 9front on raspberry pi

[Chris McGee <newton688@gmail.com>]

> On Nov 7, 2016, at 6:44 AM, arisawa <arisawa@ar.aichi-u.ac.jp> wrote:
> 
> by the way I said about raspi 1
>> the display size is 1920x1200.
>> when I try to resize a window, the mouse cursor flips and it is difficult to resize.
> This phenomenon was stopped when I connected lan cable.
> I don’t know the reason.

Interesting data point. Thank you. I tend to keep mine plugged into an active Ethernet switch. I'll try without to see if I can narrow down the problem.

> 
> I looked the source code and I guess for raspi 1:
> Plan9    BCM    pin
> GPIO0    17    11
> GPIO1    18    12
> GPIO2    27    13
> GPIO3    22    15
> GPIO4    23    16
> GPIO5    24    18
> GPIO6    25    18
> GPIO7     4     7
> GPIO8    28    24
> GPIO9    29    21
> GPIO10    30    ?
> GPIO11    31    ?
> SDA         2     3
> SCL         3     5
> CE1         7    26
> CE0         8    24
> MISO     9    21
> MOSI    10    19
> SCLK    11    23
> TxD        14     8
> RxD        15    10
> 
> and I tried some experiments.
> 
> (a) turn led light on/off that is connected to GPIO0 pin

Cool, good to know that part is working for others.

> 
> term% echo function out GPIO0 >ctl
> term% echo 1 > GPIO0
> term% echo 0 > GPIO0
> term% 
> 
> the result is OK.
> 
> (b) read GPIO1 status
> 
> term% echo function in GPIO1 >ctl
> 
> I expected:
> term% cat GPIO1    # low voltage
> 0
> term%
> 
> however I have:
> term% cat GPIO1    # low voltage
> 000000...
> 
> I expected:
> term% cat GPIO1    # high voltage
> 1
> term%
> 
> however I have:
> term% cat GPIO1
> 111111...
> 
> is this a feature or bug?
> 

This part is inherited and merged in from original 9front source code. As we discussed before there seems to be no manual page. I'm not sure the intended behaviour and I have not yet tried reading from a gpio pin myself.

So in either case on the read it just repeats forever until interrupted?

Chris