emWin gives hard fault when displaying text with SSD1963

philiphills — Wed, 23 Aug 2017 14:31:05 GMT

I am using the NXP emWin (5.38a) library running on an LPC1768 to drive a 800 x 480 pixel LCD panel using a Solomon SSD1963 controller. Starting with the MCB1700 bsp as a template, I have configured emWin to use the FlexColor driver with 16 bpp, no cache, and a 16 bit parallel bus, and allocated 30K bytes of RAM for emWin. The display initializes properly, and I can execute various graphical commands such as GUI_SetColor, GUI_FillCircle, GUI_Clear, GUI_SetBkColor, GUI_SetPenSize, GUI_Drawline, etc. However, if I try to display any text, such as GUI_DispString, I get a hard fault within the library function GUIMONO_DispChar(). Looking at the faults register I see:

Faults = UndefInstr

Fault PC = 0x00003D40

= GUIMONO_DispChar + 108 in section .text

= No line number information available for address 0x3d40 <GUIMONO_DispChar+108>

Fault status registers:

IPSR = 0x1000003: 3 (HardFault)

CFSR = 00010000 (Configurable Fault Status Register)

HFSR = 40000000 (Hard Fault Status Register)

DFSR = 00000000 (Debug Fault Status Register)

MMAR = e000edf8 [INVALID] (MemManage Fault Address Register)

BFAR = e000edf8 [INVALID] (Bus Fault Address Register)

AFSR = 00000000 (Auxiliary Fault Status Register)

I am at a loss as to why this is happening. Any clues as to what might be the cause of the problem?

Re: emWin gives hard fault when displaying text with SSD1963

philiphills — Fri, 25 Aug 2017 12:47:47 GMT

I figured it out – I was using the wrong library. NXP documentation states “There is one set of library files for each of the 5 ARM cores and one for the x86 core.” I switched the library file to libemWin_M3.a and now can display text properly.

The clue was the fault UndefInstr; apparently the library was calling for an instruction not included in the M3 core of the LPC1768.

LPC MicrocontrollersのトピックemWin gives hard fault when displaying text with SSD1963

emWin gives hard fault when displaying text with SSD1963

Re: emWin gives hard fault when displaying text with SSD1963