WRITE_ZSCTRL(9) Internal Functions WRITE_ZSCTRL(9)NAME
write_zsctrl - Write to a Z8530 control register
void write_zsctrl(struct z8530_channel * c, u8 val);
The Z8530 channel
Value to write
Write directly to the control register on the Z8530
Alan Cox <firstname.lastname@example.org>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 WRITE_ZSCTRL(9)
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PPI(4) BSD Kernel Interfaces Manual PPI(4)NAME
ppi -- user-space interface to ppbus parallel 'geek' port
Minor numbering: unit numbers correspond directly to ppbus numbers.
The ppi driver provides a convenient means for user applications to manipulate the state of the parallel port, enabling easy low-speed I/O
operations without the security problems inherent with the use of the /dev/io interface.
All I/O on the ppi interface is performed using ioctl() calls. Each command takes a single u_int8_t argument, transferring one byte of data.
The following commands are available:
Get and set the contents of the data register.
Get and set the contents of the status register.
Get and set the contents of the control register. The following defines correspond to bits in this register. Setting a bit in the
control register drives the corresponding output low.
Get and set the contents of the EPP control register.
Get and set the contents of the ECP control register.
Read and write the ECP FIFO (8-bit operations only).
To present the value 0x5a to the data port, drive STROBE low and then high again, the following code fragment can be used:
val = 0x5a;
ioctl(fd, PPISDATA, &val);
ioctl(fd, PPIGCTRL, &val);
val |= STROBE;
ioctl(fd, PPISCTRL, &val);
val &= ~STROBE;
ioctl(fd, PPISCTRL, &val);
The inverse sense of signals is confusing.
The ioctl() interface is slow, and there is no way (yet) to chain multiple operations together.
The headers required for user applications are not installed as part of the standard system.
BSD January 2, 1998 BSD
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