B4R Question Help to write a simple hello world on that board

Bokka · Apr 28, 2020

Hello everyone!

I just bought this Arduino board to do some tests:

(http://imgur.com/xFMHt4E)

But I ask you for help to get started.

I have already configured the arduino IDE to download the software to the board and I have already tried a small application (that works).

Could someone please post a very simple program that makes "Hello world" appear on the display?

Do you need any particular library or is it already included in B4R by default?

Thanks so much!

Bokka · Apr 29, 2020

With that example code taken from the forum, the display remains black

B4X:

Sub Process_Globals
     Public Serial1 As Serial
     Private ssd As AdafruitSSD1306
     Private vx = 3, vy = 3 As Int
     Private px, py As Int
     Private radius As Int = 3
     Private tmr As Timer
End Sub


Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    ssd.InitializeI2C(23, 21)
    ssd.ClearDisplay
    tmr.Initialize("tmr_Tick", 10)
    tmr.Enabled = True
End Sub

Private Sub tmr_Tick
    ssd.GFX.DrawCircle(px, py, radius, ssd.BLACK, True)
    px = px + vx
    py = py + vy
    If px - radius <= 0 Then vx = Abs(vx)
    If px + radius >= ssd.GFX.Width Then vx = -Abs(vx)
    If py - radius <= 0 Then vy = Abs(vy)
    If py + radius >= ssd.GFX.Height Then vy = -Abs(vy)
    ssd.GFX.DrawCircle(px, py, radius, ssd.WHITE, True)
    ssd.Display 'apply the drawings
End Sub

I'm using the "rAdafruitGFX" and the "rAdafruitSSD1306" libraries.

Also, looking at the schematic of the card, I tried to change the row

"ssd.InitializeI2C (23, 21)"

with

"ssd.InitializeHSPI (16,23,5)"

But without success

derez · Apr 29, 2020

the board is esp32 , not arduino. See this:

rAdafruitSSD1306 and ESP32S

I tried to compile this clock code example with ESP32S board but I got this compilation error. any ideas? Thanks B4R Version: 2.60 Parsing code. (0.00s) Building folders structure. (0.01s) Compiling code. (0.04s) Building project (0.01s) Compiling & deploying Ino project (DOIT ESP32...

www.b4x.com

janderkan · Apr 29, 2020

Your board have, as you can see on your picture, a display based on the ST7789V chip and you use a software library for a display based on the SSD1306 driver.
I dont know the difference, but maybee that is your problem.

Bokka · Apr 29, 2020

So currently it is not possible to use B4R to program this board (at least the part of the OLED display) ....?

In all cases thank you very much for the answers ?

janderkan · Apr 29, 2020

Bokka said:
So currently it is not possible to use B4R to program this board (at least the part of the OLED display) ....?

In all cases thank you very much for the answers ?

I said that I dont know, that is not the same as ' it is not possible '.
I use this TTGO board with display, and it works perfect.

Bokka · Apr 29, 2020

janderkan said:
I said that I dont know, that is not the same as ' it is not possible '.
I use this TTGO board with display, and it works perfect.

In arduino I also use the "TTGO LoRa32-OLED V1" card, but mine seems to be different from what you actually use, already from the pin scheme it seems to have less stuff.

janderkan · Apr 29, 2020

Also if you search in the forum for the driver there are 2 posts that maybee can be used with your driver.
https://www.b4x.com/android/forum/t...uino-and-a-st7735r-tft-display.83038/#content
https://www.b4x.com/android/forum/threads/st7735r-tft-lcd-driver-needed.82945/#post-525228

thetahsk · Apr 29, 2020

Bokka said:
So currently it is not possible to use B4R to program this board (at least the part of the OLED display) ....?

In all cases thank you very much for the answers ?

Check this example and port it to B4R.

poky/ESP32_eSPI_snake

Using TFT_eSPI Arduino library with TTGO T-Display module onboard IPS ST7789V 1.14 Inch 135x240 LCD and mapping onboard two buttons for snake game play - poky/ESP32_eSPI_snake

github.com

Bokka · Apr 29, 2020

thetahsk said:
Check this example and port it to B4R.

poky/ESP32_eSPI_snake

Using TFT_eSPI Arduino library with TTGO T-Display module onboard IPS ST7789V 1.14 Inch 135x240 LCD and mapping onboard two buttons for snake game play - poky/ESP32_eSPI_snake

github.com

That example works perfect, but the library for ST7735r seems not compatible with ST7789V

Michael1968 · Apr 29, 2020

if there is a working Arduino lib...
--check if you can use inline C

Bokka · Apr 30, 2020

Michael1968 said:
if there is a working Arduino lib...
--check if you can use inline C

Ok, I can take the library used by the snake example (ESP32_eSPI_snake) and that library works fine. But I absolutely don't know how to use it on B4R.

The best is to have a B4R api from that library.

Btw thanks again for the help and the replies!

Michael1968 · Apr 30, 2020

starting point for inline C...read:

https://www.b4x.com/android/forum/threads/inline-c-c.65714/
https://www.b4x.com/android/forum/threads/mini-battery-display-inline-c.79311/

thetahsk · Apr 30, 2020

before starting with Arduino IDE / B4R update the firmware of the board,
for details look at : https://github.com/Xinyuan-LilyGO/TTGO-T-Display

Bokka · Apr 30, 2020

thetahsk said:
before starting with Arduino IDE / B4R update the firmware of the board,
for details look at : https://github.com/Xinyuan-LilyGO/TTGO-T-Display

Ok, did it

Bokka · Apr 30, 2020

It is too difficult for me to implement C code inside a B4X project. I understand that there are guides that explain well how to do it, but unfortunately I don't have so much time to devote to learning this thing, I hoped that there was a faster way with a library ready to focus more on my goal. I also probably made a mistake buying this board which is not completely compatible (for the moment) with the current libraries for B4R.
Too bad because I managed to get the wifi going, connect the card to the internet and probably I would have easily (once the bread board arrived) to do some experiments with some LEDs, but the fact of not being able to go without problems LCD makes me crazy

I thank you very much for the help you have tried to give me and I wish you good luck for everything!

Thanks again.

thetahsk · Apr 30, 2020

now you can follow the second link from janderkan

ST7735R TFT LCD driver needed

Hi Guys, I know this has been requested before, but the request was, in my opinion, badly addressed, asking for a "Graphics Display library", which already exists (https://www.b4x.com/android/forum/threads/radafruitgfx.68904/) The oficial adafruit libray can he found here...

www.b4x.com

Bokka · Apr 30, 2020

I have already tried to follow that discussion. The examples in the topic are no longer compatible with the new version of the library.

I still tried to write something myself quickly, but it doesn't work (compiled without problems but the display remains black without any text)

The AdafruitSSD1306 library is not compatble with ST7789V (I think).

The code is the following:

B4X:

Sub Process_Globals
    Public Serial1 As Serial
    Private st As AdafruitSSD1306

End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    st.InitializeHSPI(16, 23, 5)
    st.ClearDisplay 
    st.GFX.ConfigureText(1, st.WHITE, False)
    st.GFX.DrawText("Try text")
    st.Display
End Sub

viriato · Nov 12, 2020

Hi Bokka,
I just received the same board ESP32 TTGO T-Display same as yours
Have you been able to use it with B4R ?
if yes and if possible I will appreciate if you can share the code
Thank you

B4R Question Help to write a simple hello world on that board

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