View source for Pico-1.28-Round-LCD-HAT

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== Pico 1.28" Round LCD HAT ==
Pico 1.28” Round LCD HAT is a 1.28-inch display HAT with 240 x 240 resolution, 65K RGB colors, clear and colorful displaying effect, and a joystick, designed for the Raspberry Pi Pico to expand its engagement via SPI communication by providing a standard 40 pin Pico GPIO interface. The Pico 1.28" Round LCD HAT includes an integrated GC9A01 display driver and SPI interface, reducing the number of IO pins required. It features a 5-input joystick that is connected to the Pico 1.28” Round LCD HAT through a stackable GPIO connector header on the inside.

=== Features ===
<li> Raspberry Pi Pico compatibility. </li>
<li> 4-wire SPI Communication. </li>
<li> Standard Raspberry Pi Pico 40 Pins GPIO. </li>
<li> 4 directions + attached band Central press button Joystick Control  </li>
</br>

=== Specifications ===
<li> Operating Voltage - 3.3 V </li>
<li> Pixels - 240×240 resolution </li>
<li> Pixel Size - 0.135 × 0.135mm </li>
<li> Display Colour - 65K RGB </li>
<li> Display Driver -  GC9A01 </li>

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[[File:Pico_round_LCD.png|thumb|left|alt=Pico 1.28 Round LCD HAT| Buy it From : ''[https://shop.sb-components.co.uk/products/1-28-round-lcd-hat-for-pico Click Here]'']]
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== Pinout ==
<table class="wikitable">
<tr> <th>PICO 1.28" LCD HAT </th> <th>PICO Pins </th></tr>

<tr> <td> LCD DIN </td> <td> GP11 </td></tr>
<tr> <td> LCD CLK </td> <td> GP10 </td></tr>
<tr> <td> LCD DC </td> <td> GP8 </td></tr>
<tr> <td>LCD CS</td> <td> GP9 </td></tr>
<tr> <td> LCD RST </td> <td> GP12 </td></tr>
<tr> <td> LCD BL </td> <td> GP13 </td></tr>
<tr> <td> JOYSTICK UP </td> <td> GP18 </td></tr>
<tr> <td> JOYSTICK DOWN </td> <td> GP20 </td></tr>
<tr> <td>JOYSTICK LEFT</td> <td> GP21 </td></tr>
<tr> <td>JOYSTICK RIGHT</td> <td> GP17 </td></tr>
<tr> <td>JOYSTICK SELECT</td> <td> GP19 </td></tr>

</table>

== Installation ==
==== MicroPython ====
*  For running this HAT, you require these components :
** Raspberry Pi Pico X 1
** Pico 1.28" Round LCD HAT X 1
** USB Cable X 1

* Copy or clone code from Github.
https://github.com/sbcshop/PICO-1.28-Round-LCD-HAT/

* Stack Pico 1.28 Round LCD HAT with Raspberry Pi Pico, Make sure USB symbol on LCD HAT should be on the same side as of PICO USB.

* Press and hold  '''BOOTSEL''' pin of Raspberry Pi Pico and connect the USB cable, it will create a drive as RPI-RP2.

* Now drag and drog/copy '''firmware.uf2''' file from firmware folder to RPI-RP2 Drive. It will reboot your raspberry pi pico.

* Open Thonny IDE and Choose interpreter as MicroPython (Raspberry Pi pico).
[[File:Thonny-interpreter.PNG|600px]]

* Now you can run example codes from the '''Pico_Example_mpy''' folder in Thonny Ide. For example, Open the '''hello.py''' file in thonny and click on the green play button to run this example.
[[File:Pico_Round_lcd_HAT_thonny.PNG]]

It will print "Hello" on Round LCD. You can use the joystick to change the LCD color.

==== Working Example ====
* This module was tested on Raspberry Pi Pico. You need to provide a SPI object and the pin to use for the DC pin of the screen.

<source lang="python">
import machine
import gc9a01
spi = SPI(1, baudrate=40000000, sck=Pin(10), mosi=Pin(11))
tft = gc9a01.GC9A01(spi, 240, 240, reset=Pin(12, Pin.OUT), cs=Pin(9, Pin.OUT), dc=Pin(8, Pin.OUT), backlight=Pin(13, Pin.OUT), rotation=0)
tft.init()
</source>


==== Functions and Arguments ==== 
* <source inline>  gc9a01.GC9A01(spi, width, height, reset, dc, cs, backlight, rotation, buffer_size) </source>
required arguments:
<source>
`spi` spi device
  `width` display width
  `height` display height
</source>

optional args:
<source>
  `reset` reset pin
  `dc` dc pin
  `cs` cs pin
  `backlight` backlight pin
  `rotation` Orientation of display.
  `buffer_size` 0= buffer dynamically allocated and freed as needed.

  Rotation | Orientation
  -------- | --------------------
     0     | 0 degrees
     1     | 90 degrees
     2     | 180 degrees
     3     | 270 degrees
     4     | 0 degrees mirrored
     5     | 90 degrees mirrored
     6     | 180 degrees mirrored
     7     | 270 degrees mirrored
</source>
If buffer_size is specified it must be large enough to contain the largest bitmap, font character, and/or JPG used (Rows * Columns *2 bytes). Specifying a buffer_size reserves memory for use by the driver otherwise, memory required is allocated and free dynamically as it is needed. Dynamic allocation can cause heap fragmentation so garbage collection (GC) should be enabled.

'''This driver supports only 16bit colors in RGB565 notation.'''

* <source inline> GC9A01.on() </source>

Turn on the backlight pin if one was defined during init.

* <source inline> GC9A01.off() </source>

Turn off the backlight pin if one was defined during init.

* <source inline> GC9A01.pixel(x, y, color) </source>

Set the specified pixel to the given color.

* <source inline> GC9A01.line(x0, y0, x1, y1, color) </source>

Draws a single line with the provided color from (x0, y0) to (x1, y1).

* <source inline> GC9A01.hline(x, y, length, color) </source>

Draws a single horizontal line with the provided color and length in pixels. Along with vline, this is a fast version with reduced number of SPI calls.

* <source inline> GC9A01.vline(x, y, length, color) </source>

Draws a single horizontal line with the provided color and length in pixels.

* <source inline> GC9A01.rect(x, y, width, height, color) </source>

Draws a rectangle from (x, y) with corresponding dimensions

* <source inline> GC9A01.fill_rect(x, y, width, height, color) </source>

Fill a rectangle starting from (x, y) coordinates

Source code credit : https://github.com/russhughes/gc9a01_mpy

== Resources ==
<b> Github </b>
* [https://github.com/sbcshop/PICO-1.28-Round-LCD-HAT Source Code]