Re: fsk on si5351
The si5351bx routines used in Allards code and in the uBitx already do bulk transfers:toggle quoted messageShow quoted text
See post https://groups.io/g/BITX20/message/34362
Though doing FSK by i2c writes to the Si5351 will make for abrupt frequency transitions, which will cause adjacent channel interference.
The Si5351 does seem to not create any runt clocks during such transitions though.
The Si5340 has an SPI inerface allowing much faster writes, so you could do the transition as a series of smaller steps.
Farhan build an NBFM transmitter using the Si5351 by pulling around the 25mhz reference oscillator.around.
That's probably the best approach.
On Mon, Jan 8, 2018 at 03:41 am, Rod Self wrote: