xCAT - OLED display options
OLED display panel EncoderCAT has an optional small OLED display. |
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The display identifies the operated encoder and stays with that encoder until another is operated.
For each encoder, the user can configure for the OLED display (with xCAT) :
- Description, eg: "RF power" as above
- Units (eg: watts, Hz, kw, dB),
- Scaling of CAT value ie: (value x multiplier) / divisor
- Optional decimal point eg: change 75 watts to 0.075 kw
- Lookup table, eg: value 1 -> 300Hz 2 -> 600Hz 3 -> 1000Hz
My prototype uses a small 128 x 32 pixel monochrome display.
These are available from a number of eBay suppliers and cost approximately £4.00.
The display unit does not contain font data.
I have two proportional font character sets in the firmware:
- one 16 bits high for the data and one 8 bits high for the description.
I2C address: All the SSD1306 display that I found had address = 0x70
... so this is fixed in the code. If other addresses are encountered, then the code can be changed
or an address setting field added to the xCAT configuration data.
Display configuration options only affect the display.
They have no effect on the encoder's action on the radio.
xCAT encoder configuration has five fields that control the display:
- Description - this is a text description of up to 21 characters.
It is displayed at the top of the display in 8 bit high font. - units - up to six characters displayed after the value, eg MHz, ms etc
- mult - this is a multiplier for scaling the value for display.
- div - this is a divisor for scaling of the data for display
- decp - if non- zero this put a decimal point in the displayed value.
- lookup - if checked, the CAT value will be used as the index for the encoder's
lookup table. The displayed value is the value from the table.
The presented lookup value can be modified using mult, div and decp.
Scaling
The scaling calculation is (CAT value) x mult /div
Thus mult = 100 and div = 255 will scale values 0 - 255 to 0 - 100
(as in the RF power example in xCAT examples Icom )
The default value for no scaling are mult = 1 and div = 1
Decimal point
Setting decp to a value greater than zero introduces a decimal point in the display.
eg: 3.562300 MHz decp = 6
1.8 ms decp = 1
Lookups - see next page: xCAT - OLED display lookups