Raspberry pi2 problem

[clotaireFrance]

Raspberry pi2 problem

[ChristopheJacquet]

You need to have a recent Linux kernel (possibly patched, I need to check this) because now PiFmRds needs the rpi-mailbox driver. I use a Raspbian from early August and it works out of the box.

I have this problem too, running Debian 9/testing (real debian, not raspbian) and latest 4.1 kernel

root@Raspberry-Pi:~/PiFmRds# mknod mbox c 100 0
mknod: ‘mbox’: File exists

[clotaireFrance]

What a fast reply!
'Just tried it on my other RspbB+, it works fine, so funny
Although I'm a mac gyver, this kind of code ilt's too difficult for me
Can't help you...

[ChristopheJacquet]

@SandPox: No need to run mknod, pi_fm_rds does this for you. But if it fails, it means your kernel lacks the required driver. I'm will update the message and doc when I figure out the specifics.

It works fine on my Raspbian with Linux 3.18.11 (but the kernel may have been patched with RPi-specific patches by the Raspbian team).

[ChristopheJacquet]

@SandPox: may you try to change the code here in pi_fm_rds.c?

if (mknod(MBFILE, S_IFCHR|0600, makedev(100, 0)) < 0)

Change 100 into 249.

May you also send me the output of ls -l /dev/vcio?

Thanks.

[clotaireFrance]

I get

crw-rw---T 1 root video 249, 0 janv. 1 1970 /dev/vcio

[clotaireFrance]

sorry i will change the value and retry

one minute

[ChristopheJacquet]

You will also need to change MAJOR_NUM 100 to 249 in mailbox.h.

[clotaireFrance]

i do this in 5 minutes
( the soft is able to run with the first change in pi_fm_rds.c)

[ChristopheJacquet]

Ah great :) Don't bother, I checked again, the change in mailbox.h will have no effect.

[clotaireFrance]

so:
first change on pi_fm_rds.c the soft run
second change on mailbox.h the rasp is blocked

i get:

Allocating physical memory: size = 3403776 ioctl_set_msg failed:-1
mem_ref = 3403776 ioctl_set_msg failed:-1
bus_addr = 33f000 virt_addr = 0x76813000

[ChristopheJacquet]

Ah interesting, I did not expect that, thanks :)

[clotaireFrance]

My test
I reset MAJOR_NUM at value 100 in mailbox.h
the soft run, i can hear stereo_44100.wav at good frequency with RDS on my radio

but it seems to be in mono

[ChristopheJacquet]

That's weird, stereo should not be affected by the issue we're discussing here. I'll do some tests later.

[clotaireFrance]

it's emmiting in stereo but the sound is in mono

anyway
good job, T Y.

[ChristopheJacquet]

I pushed a new version: hopefully it fixes the problems you reported with the device file. It tries to use /dev/vcio, then create a device 249 (new allocation), then create a file with major 100 (old allocation).

wow, new commit working... thanks

[clotaireFrance]

Hello,

Now Working fine for Raspberry Pi 2 ! Thanks!