Raspberry Pi 3 support about rpitx HOT 7 CLOSED

Works great on my Raspberry Pi 3 Model B, pin 12, Raspbian Jessie (pretty sure it's the Lite version without the GUI). I don't think I had to sudo raspi-config to change the Interfacing Options for this to work. Pretty sure I did a sudo apt-get update, however, even after the install script for rpitx (which I think includes one at the top).

I managed to get it to stream realtime from a USB-based microphone, noting that my Radio Shack digital mic shows up as plughw:1, transmitting mono on FM 87.9 Mhz:

arecord -D plughw:1 -f S16_LE -r 48000 /dev/stdout 2> /dev/null | ./pifm /dev/stdin /dev/stdout | sudo ./rpitx -m RF -i /dev/stdin -f 87900

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On my unmodified Rpi3 with the latest jessie full the "main" output frequency is a bit off. For example using the provided sample wav file:

sudo ./rpitx -m RF -i fm.ft -f 429000 -l
rpitx Version 0.2 compiled Jun 4 2017 (F5OEO Evariste) running on Master PLL = 1000000000

Warning : Using harmonic 3
memory: 1024 MB
processor: Broadcom BCM2837
i2cDevice: /dev/i2c-1
model: Model B Pi 3
manufacturer: Sony
pcb revision: 2
warranty void: no
revision: a02082
peripheral base: 0x3f000000
Jessie
Using mbox device /dev/vcio.
3616000 Size NUM PAGES 883 PAGE_SIZE 4096
MASH 1 Freq PLL# 6
Calibrate : ppm=-7 DMA 175ns:1592ns
WaitNano=15908 F1=95331192.105386 TuneFrequency 95333298.665365 F2=95333410.915862 Initial Resolution(Hz)=2218.810476 ResolutionPWMF 24.653450 NbStep=90 DELAYStep=9
****** STARTING TRANSMIT ********

gives the following output as received by gqrx:

I ask for 429.000Mhz but I get the signal on 430.665500Mhz . The only thing that's remarkable about this pi3 is that it is connected to a non hdmi monitor; should i try another one?

I tried sudo -s echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor as suggested in issue #21 but it didn't help. Let me know if i can run any needed test.

from rpitx.

I wait for my pi 3 to test. So I cant' tell if rpitx works or not.
About higher frequency, I have maybe some ticks to get higher even on Raspberry 2 but not yet tested.

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Do you have any news about raspberry pi 3?

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I have verified its working with Pi 3. Any news of this working on Pi Zero. I could not make it work

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@primeshp Any ideas/tests regarding the upper freq limit for PWM? (The old rp2 has about 125 MHz according to BCM2835 datasheet.)

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And btw, this project next will be ported over to a Raspberry Pi Zero W after the initial shake-down test so I should know more after testing this at the venue first to their 548.5 Mz—tuned Sennheiser receiver.

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