dsp56k - DSP56001 interface device
ssize_t read(int fd, void *data, size_t length);
ssize_t write(int fd, void *data, size_t length);
int ioctl(int fd, DSP56K_UPLOAD, struct dsp56k_upload *program);
int ioctl(int fd, DSP56K_SET_TX_WSIZE, int wsize);
int ioctl(int fd, DSP56K_SET_RX_WSIZE, int wsize);
int ioctl(int fd, DSP56K_HOST_FLAGS, struct dsp56k_host_flags *flags);
int ioctl(int fd, DSP56K_HOST_CMD, int cmd);
The dsp56k device is a character device with major number 55 and minor number 0.
The Motorola DSP56001 is a fully programmable 24-bit digital signal processor
found in Atari Falcon030-compatible computers. The dsp56k
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)
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 control the dsp56k
- resets the DSP56001 and uploads a program. The third ioctl(2)
argument must be a pointer to a struct dsp56k_binary with members
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
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 status member.
- 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.
DSP56000/DSP56001 Digital Signal Processor User's Manual
This page is part of release 3.74 of the Linux man-pages
description of the project, information about reporting bugs, and the latest
version of this page, can be found at