Glcd not working.....

[amjadali56]

First of all Great Project and work.... Thanks a lot for such good job and sharing.
I'm using Devkit V1 ! No matter what I do, stuck on no-display LCD.... I'm using ST7902, tried both HW-SPI and SW-SPI but no luck...
LCD is driven by 5V also the LCD-IO pins are connect directly without any extra components.
Only LCD is connected to board, SD, POT and BTN are not connected.
No Change in Code. Except "platform = espressif32@3.5.0" and for SW-SPI "U8G2_ST7920_128X64_F_SW_SPI u8g2{U8G2_R3, 16, 2, 15, 22}; "_
Checked the LCD and board with both SW-SPI and HW SPI example code which worked fine....

[positron96]

Hi. I can provide limited advice only, since I do not have access to your hardware.

1. Add debug UART output to the code and see what it does and what is does not. Maybe it hangs somewhere at the start.
2. Gradually transform example code that works into project code and see where it stops working. Or the other way around.

Off the top of my head I can suggest looking at display bus speed (it's set to 600000 in main.cpp)

[amjadali56]

looks like the problem is here

C:/Users/Amjad Ali/.platformio/packages/framework-arduinoespressif32@3.10006.210326/cores/esp32/esp32-hal-spi.c: In function 'spiTransferBytesNL':
C:/Users/Amjad Ali/.platformio/packages/framework-arduinoespressif32@3.10006.210326/cores/esp32/esp32-hal-spi.c:922:39: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
                 uint8_t * last_out8 = &result[c_longs-1];
                                       ^
C:/Users/Amjad Ali/.platformio/packages/framework-arduinoespressif32@3.10006.210326/cores/esp32/esp32-hal-spi.c:923:40: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
                 uint8_t * last_data8 = &last_data;

[amjadali56]

OK.... Problem solved :) The issue is in the Espressif@^3.5.0 library esp32-hal-spi.c file where there is an incompatible pointer.
...../platformio/packages/framework-arduinoespressif32@3.10006.210326/cores/esp32/esp32-hal-spi.c
The ‘result’ and ‘last_data’ are initialized as uint32_t.

The original code:
uint8_t * last_out8 = &result[c_longs-1];
uint8_t * last_data8 = &last_data;

To this:
uint32_t * last_out8 = &result[c_longs-1];
uint32_t * last_data8 = &last_data;

I made this change and it worked for me. Hope it help someone else..... Cheers and many many thanks for such a good project....

[positron96]

I'm very glad that you've fixed it! On a side note, I probably need to pin the version of ESP SDK to one that worked for me.

[amjadali56]

Please do mention ESP SDK which worked for you......