Replacing SHIFTOUT with USB - off the BS2 coding subject!!
This is off the subject of BS2 coding.
I have partially finished my BS2 project of interfacing the DDS (direct digital synthesis) oscillator to SDR (software defined radio). Since the main (audio) processing is done by PC audio card I am looking into replacing the BS2 controller. It is now setting the DDS oscillator via SHIFTOUT.
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I need to build / find a device which would interface via USB. Ideally directly - no serial to USB conversion. However, I do have commercial USB to serial interface working with my other radio and may use that for starters. But I really need to replicate the SHIFTOUT software in hardware.
Any constructive comments on this would be appreciated.
Thanks for reading.
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I have partially finished my BS2 project of interfacing the DDS (direct digital synthesis) oscillator to SDR (software defined radio). Since the main (audio) processing is done by PC audio card I am looking into replacing the BS2 controller. It is now setting the DDS oscillator via SHIFTOUT.
·
I need to build / find a device which would interface via USB. Ideally directly - no serial to USB conversion. However, I do have commercial USB to serial interface working with my other radio and may use that for starters. But I really need to replicate the SHIFTOUT software in hardware.
Any constructive comments on this would be appreciated.
Thanks for reading.
··
Comments
If you really want to provide a hardware-only interface, you might start with the FTDI USB to parallel FIFO chips. These look like a serial port to the PC, but present the data in 8-bit parallel form with some handshaking lines. You could use a 555 timer to produce the clock output and a parallel to serial shift register (74HC165?) to shift out the data. You'd need a counter and some sequencing logic to start things when data shows up and stop things when the data's been shifted out.