Hard fault when drawing bit map using STemWin on STM32F4

[rbs3rd]

Posted on May 19, 2014 at 19:07

When I try to display a bit map on my LCD, the STM32F4 jumps to the hard fault  handler. Because the library is in a binary format, I can't really see whats causing the fault. If I comment out the line, the hard fault doesn't happen. I am using other STemWin functions, GUI_SetColor, GUI_FillRect, GUI_SetFont, GUI_DispStringAt, and the LCD behaves exactly as I expect it to. I know that writing to a protected bank of SDRAM will cause an AHB error, and hard fault, so I've verified that the write protect bits are cleared. I'm looking for a recommendation on how to assess the root cause of the hard fault. 

#stemwin-stm32f429

[Tesla DeLorean]

Posted on May 20, 2014 at 17:03

I did not think that error could cause the M4 to experience a bus fault/hard fault. 

Well it doesn't directly, it's more likely a side effect of the code reading an unexpectedly large/wrong number and the resultant math causing it to try and access beyond the scope of the memory.

[francescatodiego]

Posted on May 20, 2014 at 18:52

Second, do you know where IAR specifies the stack size. 

From IAR ide: Project->options select Linker in category list Tab Config press Edit...button select Stack/Heap Sizes tab

[rbs3rd]

Posted on May 20, 2014 at 20:55

Thanks!

[rbs3rd]

Posted on July 30, 2014 at 16:32

The second revision of my HW did have the byte enables assigned correctly, and the hard fault was an issue no more!

[Tesla DeLorean]

Posted on July 30, 2014 at 16:54

The second revision of my HW did have the byte enables assigned correctly, and the hard fault was an issue no more!

Awesome, thanks for the follow up.