FlexNet driver documentation
DG1SCR - driver for the DG1SCR DSP board
Driver for the DG1SCR DSP board.
This driver allows DG1SCR's DSP board to be used either as 1200 baud
AFSK modem or as 9600 baud FSK modem, compatible to the G3RUH standard.
The board works as a modem frontend, sending a serial bitstream to the
PC, which then decodes it (HDLC protocol). With 9600 baud, the analog output
MUST be filtered with an analog filter!
Starting with newer versions of Jürgen's monitor EPROMs, RTS is
used for hardware handshake and can no longer be used as PTT signal.
||description of the parameters
||the COM port number
||base address of the serial interface (if -c is not used)
||the IRQ number (if -c is used, -i must be placed
||invert DTR (DTR serves as the reset line for the DSP)
||left output attenuation (0..95dB)
||right output attenuation (0..95dB)
||output attenuation of both channels (0..95dB)
||left input gain (0..23dB)
||right input gain (0..23dB)
||input gain of both channels (0..23dB)
||use mic input
||switch off line out
||switch off headphone out
||switch off speaker out
The 9600 baud modem is sensitive to DC levels at the input. Make sure
that the receiver signal is centered around ground!
- Calibration finishes with some delay (maximum about 45secs at 1200
- Measurement of the TX delay of other stations is not supported
- The 9600 Baud modem requires an analog filter, because the computing
power of the DSP did not suffice for a better digital one
- The 20dB amp at the mic input is switched off. This is not possible
on pre revision E codecs. (the codec revision is displayed at the start
of the driver)
Thomas Sailer <email@example.com>