4d Systems 3.5" TFT Intelligent Display Module SK-35DT SK-35DT Data Sheet

Product codes

SK-35DT

4D SYSTEMS uLCD-35DT Display Module

uLC

-35

spl

The counters can be read and written at any time.

Please  refer  to  the  table  in  section  4.4  ‘Alternate
Pin  Functions  –  Overview’  for  details  on  which
GPIO can be configured for this.

To enable the Pin Counter function on a GPIO pin,
the following 4DGL function is used:

pin_Counter(pin, mode, OVFfunction);

Where  ‘pin’  is  the  GPIO  pin  compatible  with  this
particular  function,  ‘mode’  is  the  type  of  trigger
used to count  on  such as Rising/Falling/Edge, and
‘OVFfunction’ is the user function to call when the
counter overflows, if desired.

Please  refer  to  the  separate  document  titled
'DIABLO16-4DGL-Internal-Functions.pdf'  for  more
information  on  how  to  use  the  Pin  Counter
functions, along with the separate document titled
‘DIABLO16-Processor-Datasheet-REVx.x.pdf’.

Quadrature In

4.11.

There are two Quadrature Input channels available
on the DIABLO16 processor, which requires 2 GPIO
pins each.

Please refer to the table on the previous page for
details  on  which  GPIO  can  be  configured  for
Quadrature Input.
Quadrature  Input  allows  a  quadrature  encoder  to
be connected, and the position counter and delta
counter can be read at any time.

To enable the Quadrature Input  function on a  set
of GPIO pins (2 pins required), the following 4DGL
function is used:

Qencoderx(PHApin, PHBpin, mode);

Where ‘Qencoderx’ is substituted for Quencoder1
or  Quencoder2  accordingly,  ‘PHApin’  is  the  pin
connected to the A Phase of the Encoder, ‘PHBpin’
is the pin connected to the B Phase of the Encoder,
and ‘mode’ is not currently used so is to be set to
zero (0).

Please  refer  to  the  separate  document  titled
'DIABLO16-4DGL-Internal-Functions.pdf'  for  more
information  on  how  to  use  the  Quadrature  Input
functions, along with the separate document titled
‘DIABLO16-Processor-Datasheet-REVx.x.pdf’.

Analog Inputs

4.12.

Please  refer  to  the  table  in  section  4.2  for  details
on  which  GPIO  can  be  configured  to  be  analog
inputs.

The  analog  inputs  on  the  DIABLO16  have  a  range
of 0 to 3.3V, each with a max resolution of 12-bits.

The analog inputs can be read using three modes,
standard  mode,  averaged  mode  or  high  speed
mode.

Standard  Mode  results  in  a  sample  being
immediately  read.  Standard  Mode  can  read  over
40000 values per second. Operates at 12-bit.

Averaged  Mode  results  in  a  16  sample  being
immediately  read  and  their  average  returned.
Averaged  Mode  can  read  approximately  20000
values per second. Operates at 12-bit.

Highspeed Mode  collects a  user  specified number
of samples at a  user specified rate/frequency and
can  execute  a  user  function  when  complete.  The
updated  value  updates  approximately  250000
times across 1-4 channels. Operates at 10-bit.

Note:  The  various  analog  modes  can  interfere
with  the  operation  of  the  touch  screen  if  their
functions  are  called  too  frequently.  It  is
recommended  to  limit  the  calls  of  the  analog
functions  to  a  maximum  of  once  every
millisecond. Please refer to the Internal Functions
documentation  for  further  information  on  this
topic.

To enable a GPIO to be used as an Analog Input for
Standard or Averaged modes, the following 4DGL
function is used to set the pin:

pin_Set(mode, pin);

Where ‘mode’ is the desired mode defined above,
either Standard or Averaged, and ‘pin’ is the GPIO
compatible with this function which is to become
an Analog Input.

For highspeed mode, the following 4DGL function
is used to set the pin and define the parameters:

ana_HS(rate, samples, 1buf, 2buf, 3buf, 4buf, func);

Where ‘rate’ is the number of samples per second,
‘samples’ is the number of samples to collect per
channel, ‘1buf’  ‘4buf’ are the buffer addresses
for the 4 channels, and ‘func’ is the user function