dsp56k — DSP56001 interface device
|struct dsp56k_upload *program
|struct dsp56k_host_flags *flags
The Motorola DSP56001 is a fully programmable 24-bit
digital signal processor found in Atari Falcon030-compatible
file is used to control the DSP56001, and to send and receive
data using the bidirectional handshaked host port.
To send a data stream to the signal processor, use write(2) to the device, and read(2) to receive processed data. The data can be sent or received in 8, 16, 24, or 32-bit quantities on the host side, but will always be seen as 24-bit quantities in the DSP56001.
The following ioctl(2) calls are used to
resets the DSP56001 and uploads a program. The third
must be a pointer to a struct dsp56k_binary with
bin pointing to a
DSP56001 binary program, and
len set to the length of the program,
counted in 24-bit words.
sets the transmit word size. Allowed values are in the range 1 to 4, and is the number of bytes that will be sent at a time to the DSP56001. These data quantities will either be padded with zero bytes, or truncated to fit the native 24-bit data format of the DSP56001.
sets the receive word size. Allowed values are in the range 1 to 4, and is the number of bytes that will be received at a time from the DSP56001. These data quantities will either truncated, or padded with a null byte ('\0') to fit the native 24-bit data format of the DSP56001.
read and write the host flags. The host flags are four general-purpose bits that can be read by both the hosting computer and the DSP56001. Bits 0 and 1 can be written by the host, and bits 2 and 3 can be written by the DSP56001.
To access the host flags, the third ioctl(2) argument
must be a pointer to a struct dsp56k_host_flags. If
bit 0 or 1 is set in the
dir member, the corresponding bit in
out will be written to
the host flags. The state of all host flags will be
returned in the lower four bits of the
sends a host command. Allowed values are in the range 0 to 31, and is a user-defined command handled by the program running in the DSP56001.
Digital Signal Processor User's Manual
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Copyright (c) 2000 lars brinkhoff <larsnocrew.org>
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Modified, Thu Jan 27 19:16:19 CET 2000, larsnocrew.org