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by qtxradio
Tue Jun 04, 2019 2:01 pm
Forum: Graphics, sound and multimedia
Topic: GPCLK0, trouble setting some frequencies
Replies: 12
Views: 2242

Re: GPCLK0, trouble setting some frequencies

OK, the spectrum pictures are quite informative. The zip file shows the same command with mash 0 .. 3. mash0 ignores the fraction so it is 500/20. Clean but not the right frequency mash1..3 show the correct frequency plus spurs and various levels of mashing. The second harmonic is higher than I woul...
by qtxradio
Mon Jun 03, 2019 10:52 am
Forum: Graphics, sound and multimedia
Topic: GPCLK0, trouble setting some frequencies
Replies: 12
Views: 2242

Re: GPCLK0, trouble setting some frequencies

I have looked at the minimal_clk example and it is a great help. I suspect that the pigs method is more subtle than the minimal_clk case, so don't fully understand why some frequencies are rounding while others not. But, as you suggested, it is linked to the complications round the mash filter and t...
by qtxradio
Sun Jun 02, 2019 3:19 pm
Forum: Graphics, sound and multimedia
Topic: GPCLK0, trouble setting some frequencies
Replies: 12
Views: 2242

Re: GPCLK0, trouble setting some frequencies

Thank you for the additional link, which I will look into next. I have had other stuff to attend to, then got back to this today. Following your question on integer/fractional parts, I made the following measurements using a spectrum analyser which is considerably more accurate than the scope I used...
by qtxradio
Thu May 30, 2019 2:44 pm
Forum: Graphics, sound and multimedia
Topic: GPCLK0, trouble setting some frequencies
Replies: 12
Views: 2242

Re: GPCLK0, trouble setting some frequencies

I have tried the wiringPi approach using the gpio terminal commands. But this time the highest frequency that is correctly set is round 2 MHz. Above that there is an error in the value, and setting a value above about 8 MHz doesn't do anything. Also, thanks for the code pointers, though I admit I'm ...
by qtxradio
Wed May 29, 2019 3:59 pm
Forum: Graphics, sound and multimedia
Topic: GPCLK0, trouble setting some frequencies
Replies: 12
Views: 2242

Re: GPCLK0, trouble setting some frequencies

Thank you, I will look into wiringPi, but I am still curious whether anyone can shed light on why the output is 'rounded' or 'truncated' for values such as the ones from 2.38 to 2.49 MHz.
by qtxradio
Wed May 29, 2019 2:15 pm
Forum: Graphics, sound and multimedia
Topic: GPCLK0, trouble setting some frequencies
Replies: 12
Views: 2242

GPCLK0, trouble setting some frequencies

I am trying to create a 24.576MHz clock from one of the GPCLK pins. Working from a NOOBS installation, and running pigpiod with pigs commands I can generate various frequencies on GPIO4, but above 23.7 MHz it seems to go wrong. For example, using pigs hc 4 <value> where value is a long int, then mea...
by qtxradio
Wed Feb 15, 2017 6:56 pm
Forum: General discussion
Topic: smtp configuration
Replies: 11
Views: 5580

Re: smtp configuration

Thank you for the help provided. I have stumbled on a solution, but still no idea why one address works while the other does not. Note, I do have only letters and numbers in the passwords. Anyway, I have found that if I omit the @gmail.com from the AuthUser entry for the new email address it does no...
by qtxradio
Tue Feb 14, 2017 2:26 pm
Forum: General discussion
Topic: smtp configuration
Replies: 11
Views: 5580

smtp configuration

I have had smtp mail working in the past but now cannot get mail to sent from an RPi when using a new gmail account This new account is just for the RPi because I am reluctant to put my personal email credentials into the ssmtp.conf file. File ssmtp.conf: (private stuff obscured) Debug=YES root=Some...
by qtxradio
Thu Aug 01, 2013 11:54 am
Forum: Beginners
Topic: Running IDLE with subprocess?
Replies: 0
Views: 325

Running IDLE with subprocess?

I have searched for this problem and found no help so I wonder if I am missing something very basic. Essentially in order to run IDLE on the RPi I have to also use the -n option. Is this normal? In my case, when I run IDLE (i.e from startx and a display connected directly to the RPi), either using t...

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