User Manual

Hexiwear Workstation
Page 19
Hexiwear Workstation board features two reset
buttons, which can be used to manually reset the
respective MCUs of the docked Hexiwear (Figure
20). Holding K64W RESET button while powering the
system, will boot the DAPLink programmer in the
MAINTENANCE mode. This allows re-programming of
the onboard OpenSDA programmer, in case when the
internal programmer fi rmware has been damaged,
for any reason.
BUTTONS
LEDs
Figure 16: I/O group push buttons
Figure 17: Button press level DIP switch
Figure 18: I/O group LEDs
Figure 19:
SW4.1 through
SW4.5 switches
are used to
enable group
LEDs
The logic state of all Hexiwear digital inputs may be
controlled using the push buttons (Figure 16).
Hexiwear Workstation board contains 8 LEDs in each
group (except the group 4, which has 7 LEDs), which
can be used for visual indication of the logic state on
each pin. (Figure 18) An active LED indicates that a
logic HIGH level (logic 1) is present on the pin. In order
to enable LEDs on a specifi c group, it is necessary to
set the corresponding switch ON.
Each I/O group has 8 buttons. The tri-state DIP
switch, labeled as “BUTTON PRESS LEVEL” (SW7),
is available for selecting which logic state will be
applied to the corresponding group pins, when the
button is pressed. Each of the SW7 DIP switches
controls the behavior of the entire group to which it
is assigned (G0 to G4) (Figure 17)
For example, If the SW7.1 switch is in the up
position, then pressing any button in group 0 will
apply a logic HIGH state to the corresponding pin,
connecting it to the VCC via the 220 ohm resistor,
used for protection. The same principle applies for
down position, but this time, a logic LOW state will
be applied. If DIP switch is in the middle position,
neither of two logic states will be applied, and the pin
Switches SW4.1 to SW4.5 are used to turn on LED
functionality for each group, respectively. To protect
both LEDs and the Hexiwear platform itself, every
LED is connected to group pins via the 10K resistor,
limiting the current to an acceptable level. (Figure 19)
CONNECTIVITY
Reset Buttons
Figure 20: Reset buttons
is left to fl oat. Shorting jumpers J22 for up position
(and J23 for down position, respectively), will bypass
the 220 ohm resistor, allowing buttons to connect
pins to VCC (or GND), directly.