ILI9331 on bluepill_f103c8

[banoz]

Hi,

I'm trying to make HelloWorld example to run on round ILI9331 display which is connected by parallel interface to STM32F103C8 based BluePill board. The init is like this:

/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
Arduino_DataBus *bus = new Arduino_STM32PAR8(PB5, PB6, PB4, PB3, GPIOA);

/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
Arduino_GFX *gfx = new Arduino_ILI9331(bus, PB7, 0 /* rotation */, false /* IPS */);

and it doesn't work ofc.

My question is can Arduino_ILI9331 work on parallel interface at all?

Thanks,
Vas

[banoz]

The display is this board https://www.aliexpress.com/item/2251832634390438.html

[moononournation]

@monte-monte any suggestion?

[banoz]

and I've checked the display is not broken by running this and getting the correct ID from reg 0x00

[monte-monte]

@banoz I have exactly the same display, and it works with bluepill. How did you wire it up exactly?

[banoz]

//Port data |D7 |D6 |D5 |D4 |D3 |D2 |D1 |D0 |
//Pin stm32 |PA7|PA6|PA5|PA4|PA3|PA2|PA1|PA0|

//Control pins |RD |WR |RS |CS |RST|
//Pin stm32    |PB3|PB4|PB5|PB6|PB7|

[banoz]

Here's the entire piece of code of the test that I'm running

#include <Arduino_GFX_Library.h>

#define GFX_BL DF_GFX_BL // default backlight pin, you may replace DF_GFX_BL to actual backlight pin

/* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
#if defined(DISPLAY_DEV_KIT)
Arduino_GFX *gfx = create_default_Arduino_GFX();
#else /* !defined(DISPLAY_DEV_KIT) */

/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
Arduino_DataBus *bus = new Arduino_STM32PAR8(PB5, PB6, PB4, PB3, GPIOA);

/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
Arduino_GFX *gfx = new Arduino_ILI9331(bus, PB7, 0 /* rotation */, false /* IPS */);

#endif /* !defined(DISPLAY_DEV_KIT) */
/*******************************************************************************
 * End of Arduino_GFX setting
 ******************************************************************************/

void setup(void)
{
    gfx->begin();
    gfx->fillScreen(BLACK);

#ifdef GFX_BL
    pinMode(GFX_BL, OUTPUT);
    digitalWrite(GFX_BL, HIGH);
#endif

    gfx->setCursor(10, 10);
    gfx->setTextColor(RED);
    gfx->println("Hello World!");

    pinMode(PC13, OUTPUT);

    delay(5000); // 5 seconds
}

void loop()
{
    gfx->setCursor(random(gfx->width()), random(gfx->height()));
    gfx->setTextColor(random(0xffff), random(0xffff));
    gfx->setTextSize(random(6) /* x scale */, random(6) /* y scale */, random(2) /* pixel_margin */);
    gfx->println("Hello World!");

    delay(1000); // 1 second
    digitalWrite(PC13, !digitalRead(PC13)); // toggle PC13
}

[banoz]

Just tried to change gfx->fillScreen(BLACK) to gfx->fillScreen(YELLOW) and it worked. But still no text on the screen.

[monte-monte]

@moononournation I've tested on my setup, that was laying around from the time I've made a commit #112 and it turns out that it doesn't work with version 1.1.9 that you've released after the one I was working with. So I guess something you've added apart from my commits broke the part I've wrote.
To be clear, I've just tested version 1.1.9 - not working, just after first text appears, everything stops and display is cleared, seems like MCU just crashes.
Then I've downloaded 1.1.8 and added only my commits for ILI9331 and STM32 parallel support. And now everything works again.

[monte-monte]

@moononournation aa8621f this commit brakes things.

[monte-monte]

@banoz you can try pull this and see if it will work for you #177

[banoz]

It helped, thank you!

[banoz]

Found a copy-paste issue
#define ILI9331_CABCCTL7 0xCD ///CABC Control 7
should be
#define ILI9331_CABCCTL7 0xCE ///CABC Control 7

[moononournation]

I just found there are double checking on the changes of the address window, please get update if it can fit it.
Sorry for I do not have ILI9331 and Bluepill in hand.

[monte-monte]

Yes the latest changes to ILI9331 works. Rotation is fine too.