Segmentation Fault

[RickSeiden]

Hello,

I'm using a Pi Zero W with a generic ili9340 display. I've got it wired as per your instructions in the README.md. I followed the directions that you have labeled just for the Raspberry Pi and did not receive any errors. during setup/compiling. When everything was done I ran:

./demo

from the Raspberry-ili9340spi directory and received the following error:

Your TFT resolution is 240 x 320. Your TFT offsetx is 0. Your TFT offsety is 0. Segmentation fault

I looked through the issues and saw a recommendation to someone to use bmc2835 1.6.4, so I used the only Raspberry Pi instructions to use 1.64 instead. I still receive the same error.

Thank you

[nopnop2002]

I don't have Pi Zero W. Do you have some other Pi?

[RickSeiden]

Actually, I was just trying it out on a Pi 3 B, although I just swapped the SD card and didn't do a fresh install. I ended up with the same result.

[nopnop2002]

OK Change some code of demo.c & try.

    // You can change font file
    FontxFile fx32G[2];
    FontxFile fx24G[2];
    FontxFile fx16G[2];
    Fontx_init(fx32G,"./fontx/ILGH32XB.FNT","./fontx/ILGZ32XB.FNT"); // 16x32Dot Gothic
    Fontx_init(fx24G,"./fontx/ILGH24XB.FNT","./fontx/ILGZ24XB.FNT"); // 12x24Dot Gothic
    Fontx_init(fx16G,"./fontx/ILGH16XB.FNT","./fontx/ILGZ16XB.FNT"); // 8x16Dot Gothic
    printf("pass1\n");

    FontxFile fx32M[2];
    FontxFile fx24M[2];
    FontxFile fx16M[2];
    Fontx_init(fx32M,"./fontx/ILMH32XF.FNT","./fontx/ILMZ32XF.FNT"); // 16x32Dot Mincyo
    Fontx_init(fx24M,"./fontx/ILMH24XF.FNT","./fontx/ILMZ24XF.FNT"); // 12x24Dot Mincyo
    Fontx_init(fx16M,"./fontx/ILMH16XB.FNT","./fontx/ILMZ16XF.FNT"); // 8x16Dot Mincyo
    printf("pass2\n");

    lcdInit(screenWidth, screenHeight, offsetx, offsety);
    printf("pass3\n");
    lcdReset();
    printf("pass4\n");
    lcdSetup();
    printf("pass5\n");

[RickSeiden]

Hello

I have not made any changes to tft.config.

I hade already put in some debugging code in demo.c. I only made changes to the main function.

int main(int argc, char **argv)
{
    int i;
    int screenWidth = 0;
    int screenHeight = 0;
    int offsetx = 0;
    int offsety = 0;
    char dir[128];
    char cpath[128];

printf("argv[0]=%s\n",argv[0]);
    strcpy(dir, argv[0]);
    for(i=strlen(dir);i>0;i--) {
        if (dir[i-1] == '/') {
          dir[i] = 0;
          break;
        } // end if
    } // end for
printf("dir=%s\n",dir);
    strcpy(cpath,dir);
    strcat(cpath,"tft.conf");
printf("cpath=%s\n",cpath);
    if (ReadTFTConfig(cpath, &screenWidth, &screenHeight, &offsetx, &offsety) == 0) {
        printf("%s Not found\n",cpath);
        return 0;
    }
printf("ReadTFTConfig:screenWidth=%d height=%d\n",screenWidth, screenHeight);
    printf("Your TFT resolution is %d x %d.\n",screenWidth, screenHeight);
    printf("Your TFT offsetx    is %d.\n",offsetx);
    printf("Your TFT offsety    is %d.\n",offsety);


    // You can change font file
printf("fontx 0");
    FontxFile fx32G[2];
printf("fontx 1");
    FontxFile fx24G[2];
    FontxFile fx16G[2];
    Fontx_init(fx32G,"./fontx/ILGH32XB.FNT","./fontx/ILGZ32XB.FNT"); // 16x32Dot Gothic
    Fontx_init(fx24G,"./fontx/ILGH24XB.FNT","./fontx/ILGZ24XB.FNT"); // 12x24Dot Gothic
    Fontx_init(fx16G,"./fontx/ILGH16XB.FNT","./fontx/ILGZ16XB.FNT"); // 8x16Dot Gothic
printf("fontx 2");

This is what I get when I compile and run it:

argv[0]=./demo
dir=./
cpath=./tft.conf
width=240 height=320
ReadTFTConfig:screenWidth=240 height=320
Your TFT resolution is 240 x 320.
Your TFT offsetx    is 0.
Your TFT offsety    is 0.
Segmentation fault

It's weird because the first statement after the printf that outputs my offsety is just another printf, and I never see the output from that.

[RickSeiden]

Hello again,

I started with a fresh install of the latest version of Raspberry PI OS, did sudo apt-get update, sudo apt-get upgrade and then followed the Rapsberry Pi only instructions. I did have to run sudo apt-get install git half way through, but other than that, I ran everything as the instructions indicated. I still get the segmentation fault error.

[RickSeiden]

I figured it out. I was running

./demo

When I run

sudo ./demo

it works fine. So it's a permissions issue.

[nopnop2002]

Older OS don't require permissions.

There may be a bug in the latest OS.