kopia lustrzana https://github.com/F5OEO/PiFmRds
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## FM-RDS transmitter using the Raspberry Pi's PWM
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## by Christophe Jacquet, F8FTK
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This program generates an FM modulation, with RDS (Radio Data System) data generated in real time.
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It is based on the FM transmitter created by [Oliver Mattos and Oskar Weigl](http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter), and later adapted to using DMA by [Richard Hirst](https://github.com/richardghirst).
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It is based on the FM transmitter created by [Oliver Mattos and Oskar Weigl](http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter), and later adapted to using DMA by [Richard Hirst](https://github.com/richardghirst). Christophe Jacquet adapted it and added the RDS transmitter.
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## How to use it?
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@ -99,6 +98,9 @@ The shaped biphase symbol is generated by a Python program called `generate_wave
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The samples are played by `pi_fm_rds.c` that is adapted from Richard Hirst's [PiFmDma](https://github.com/richardghirst/PiBits/tree/master/PiFmDma). The program was changed to support a sample rate of precisely 228 kHz, four times the RDS subcarrier's 57 kHz.
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### References
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* [EN 50067, Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the frequency range 87.5 to 108.0 MHz](http://www.interactive-radio-system.com/docs/EN50067_RDS_Standard.pdf)
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