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 bi-directional handshaked host port.
To send a data stream to the signal processor, use write() to the device, and read() 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:
resets the DSP56001 and uploads a program. The third ioctl() 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 zero byte 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() 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.