DSP56K(4) | Linux Programmer's Manual | DSP56K(4) |
NAME
dsp56k - DSP56001 interface deviceSYNOPSIS
#include <asm/dsp56k.h>
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);
CONFIGURATION
The dsp56k device is a character device with major number 55 and minor number 0.DESCRIPTION
The Motorola DSP56001 is a fully programmable 24-bit digital signal processor found in Atari Falcon030-compatible computers. The dsp56k special 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 control the dsp56k device:
- DSP56K_UPLOAD
- 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.
- DSP56K_SET_TX_WSIZE
- 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.
- DSP56K_SET_RX_WSIZE
- 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.
- DSP56K_HOST_FLAGS
-
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.
- DSP56K_HOST_CMD
- 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.
FILES
/dev/dsp56kSEE ALSO
linux/include/asm-m68k/dsp56k.h, linux/drivers/char/dsp56k.c, http://dsp56k.nocrew.org/ DSP56000/DSP56001 Digital Signal Processor User's ManualCOLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.2012-08-05 | Linux |