EPGPIO(4) | Device Drivers Manual | EPGPIO(4) |
epgpio
—
epgpio0 at epsoc? addr 0x80840000 size 0xcc intr 59
gpio* at epgpio?
options EPGPIO_PORT_A_MASK=0xXX
options EPGPIO_PORT_B_MASK=0xXX
options EPGPIO_PORT_C_MASK=0xXX
options EPGPIO_PORT_D_MASK=0xXX
options EPGPIO_PORT_E_MASK=0xXX
options EPGPIO_PORT_F_MASK=0xXX
options EPGPIO_PORT_G_MASK=0xXX
options EPGPIO_PORT_H_MASK=0xXX
epgpio
driver provides support for the on-board
General Purpose I/O (GPIO) pins on the Cirrus Logic EP93xx series of
processors. There are 8 GPIO ports (Ports A though H) each having 8 GPIO pins
available (note: early revisions of some EP9301 processors have some ports
with less than eight pins available on each port; check the documentation for
your specific processor).
The epgpio
driver provides a
gpio(4) controller interface
and will attach each port as a separate
gpio(4) device with 8 pins
available. All pins are bidirectional; when used as inputs they should not
be driven beyond TTL voltage levels, but for exact details on the electrical
interface the documentation for the specific evbarm board should be
consulted.
epgpio
driver.
options EPGPIO_PORT_A_MASK=0xXX
options EPGPIO_PORT_B_MASK=0xXX
options EPGPIO_PORT_C_MASK=0xXX
options EPGPIO_PORT_D_MASK=0xXX
options EPGPIO_PORT_E_MASK=0xXX
options EPGPIO_PORT_F_MASK=0xXX
options EPGPIO_PORT_G_MASK=0xXX
options EPGPIO_PORT_H_MASK=0xXX
Each of these options is a bitmask specifying the pins available to the gpio(4) controller for the corresponding port. Pins should be disabled if they are not available or are being used by the hardware for other purposes. The default mask is “0xff” for all ports.
EPGPIO_PORT_A_MASK
is set to “0x2c”,
Port A pins 1, 3, and 5 will appear as
gpio(4) pins 0, 1, and 2
respectively.
February 22, 2009 | NetBSD 9.4 |