Page
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Document number 296194 Version 2
24
th
January 2020
Command
Arguments
Function
h
Help, returns list of commands.
help
c
<Cal_1> <Cal_2>
<Cal_3>
…
<Cal_n>
Updates the calibration data. Here
n
is the number
of symbols on the display. Each symbol can have a
unique PWM weightings which allow for display
non-uniformity to be corrected for. Each symbol can
be corrected by a weighting of 0.5x to 1.5x with six
bit resolution. This calibration data will be saved to
the EEPROM on the ATMega and reloaded when the
driver is power cycled.
cOn
Turns the calibration feature on. The write frame
command will need to be run after to see the
effects.
cOff
Turns the calibration feature off. The write frame
command will need to be run after to see the
effects.
u
<Value1> <Value2>
…
<Value n>
Updates all values in the software frame buffer. This
will reset all the values in the software frame buffer
with the specified value, an eight bit (integer, 0-255)
PWM value for all the symbols.
ua
<Value>
Updates all values in the software frame buffer. This
will reset all the values in the software frame buffer
with the specified value, an eight bit (integer, 0-255)
PWM value for all the symbols
ud
<C> <Digit> <Value>
Updates a seven segment element in the software
frame buffer.
C
- the character to show on the seven
segment element (0-9, A-F).
D
igit - the digit number
specifies which seven segment element to update.
V
alue - the eight bit (integer, 0-255) PWM value for
the seven segment element.
us
<Symbol> <Value>
Updates a single symbol's, an eight bit (integer, 0-
255) PWM value in the software frame buffer.
v
<Voltage>
Sets the LED anode voltage. The voltage can be set
between 0.0 and 5.0 (volts). The DAC has eight bit
resolution which equates to a voltage resolution of
20mV. The specified voltage may not match the
output voltage exactly. The output voltage depend
on the board voltage which the firmware assumes to
be 5V. For an accurate voltage a direct measurement
on the driver board is needed.