Hi there,

I think i lack some basic understanding of how to use emwin library and the underlying driver infrastructure.

It would be much appreciated if you could help me understand the big picture here.

My setup:
I have an NXP LPC4367 mcu mounted on a custom PCB. This mcu has an lcd controller (i am not sure which is this controller. I think it is ST7565S).
I also have a 2.4'' TFT Display Module DT024CTFT which has an ILI9341 lcd controller.

What i want to do:
Clearly i want to interface this external tft display with my mcu.

Questions:
1. There are 2 lcd controllers. Mcu has its own and display module also has its own.
What controller needs to be configured? Both or choose which controller will do the job?

2. I want to use segger emwin precompiled library for nxp mcus. Where can i find LCDConf files so that i can port examples of other targets to my own?

Thanks a lot in advance

Hi!

Thanks a lot for the reply.

I am using a 16bit (5-6-5) rgb interface.

So the case is that i have to configure mcu lcd controller registers AND write to ili9341 registers to achieve communication?

Hi,

Thanks again for the help. It's been really useful.

Is there available any sample emwin project that is close to my needs (with rgb interface) so that i can leverage it?

Hi,

Thanks a lot for the previous help.

I ve tried some things but hard fault exceptions occur.

In my current setup i don't have an external sdram. So i am trying to fit emwin inside internal ram which is 32kb. Can i achieve that?
From various examples i found out that it isn't required to set an external address.

Inside LCDConf.c i don't set LCD_SetVRAMAddrEx(0, (void *)VRAM_ADDR)
and in i just set static U32 aMemory to hold emwin inside internal ram?

Is this the case?

Hi,

Great. I ll follow your suggestions and try this out.

FYI I have a custom board with an LPC4367 and a display module that uses ili9341. I am waiting for an external sdram to come, so i ll freeze this setup for a while.

Meanwhile i ll try to fix an adafruit 1.8 TFT with ST7735 controller (internal memory 384k) interfaced with an lpc4367 dev board.

I will use serial spi interface, GUIDRV_FlexColor driver and take advantage the internal display memory (384k).

So to make it clear my questions are:

Inside lcdconf.c i don't have to set LCD_SetVRAMAddrEx. RIght? Does this mean the 384k memory will be in use because i m going to use serial interface for communcation?

Inside GuiConf.c when i use GUI_ALLOC_AssignMemory what memory should i allocate?

Sorry if my questions are kind of noobish!

Hi,

After setting up st7735 1,8 TFT with lpc4367 dev board with flexcolor driver and spi communication I see on screen random dark color pixels.

After debugging i noticed that code stucks at pDevice = GUI_DEVICE_CreateAndLink(GUIDRV_FLEXCOLOR, GUICC_M565, 0, 0);

It does not throw any kind of exception but it never moves beyond that point.

Any help or idea?

Hi,

Thanks again for the reply.

I managed to overcome the silent crash at GUI_DEVICE_CreateAndLink but now i have a hardfault exception somewhere inside GUI_Init.

I attach my configuration files in case you can make a suggestion etc.

In my main function i do board initializations, a default timer is set and only GUI_Init() and GUI_SetBkColor(GUI_RED) are called.

I am trying to debug code and LCDconf and guiconf don't cause any ecxeption.

After exiting GUI_X_Init function inside GUI_X.c file which is unimplemented, program returns to GUI_Init() that lies in main and after a few seconds it crashes.

In disassembly the last instruction i can see at debug is 1a001de1 (GUI_X_Init):

1a001dd1: push {r3, r4, r5, lr}
1a001dd3: bl 0x1a001da0 <GUI__Config>
1a001dd7: ldr r5, [pc, #180] ; (0x1a001e8c <GUI_Init+188>)
1a001dd9: ldr r3, [pc, #180] ; (0x1a001e90 <GUI_Init+192>)
1a001ddb: ldr r4, [pc, #184] ; (0x1a001e94 <GUI_Init+196>)
1a001ddd: movs r2, #46 ; 0x2e
1a001ddf: strb r2, [r3, #0]
1a001de1: bl 0x1a000298 <GUI_X_Init>
1a001de5: ldr r3, [r5, #0]
1a001de7: adds r2, r3, #4
1a001de9: str r2, [r3, #60] ; 0x3c
1a001deb: add.w r2, r3, #8
1a001def: str r2, [r4, #20]
1a001df1: ldrb r2, [r3, #17]
1a001df3: str r3, [r3, #56] ; 0x38
1a001df5: str r3, [r3, #64] ; 0x40
1a001df7: ldr r3, [pc, #160] ; (0x1a001e98 <GUI_Init+200>)
1a001df9: ldr.w r0, [r3, r2, lsl #2]
1a001dfd: ldr r3, [r0, #12]
1a001dff: add.w r1, r4, #8
1a001e03: ldr r3, [r3, #48] ; 0x30
1a001e05: blx r3
1a001e07: ldr r3, [pc, #148] ; (0x1a001e9c <GUI_Init+204>)
1a001e09: str r3, [r4, #96] ; 0x60
1a001e0b: ldr r3, [pc, #148] ; (0x1a001ea0 <GUI_Init+208>)
1a001e0d: ldr r3, [r3, #0]
1a001e0f: str r3, [r4, #28]
1a001e11: ldr r3, [r5, #0]
1a001e13: adds r3, #8
1a001e15: str r3, [r4, #20]
1a001e17: movs r3, #1
1a001e19: strb r3, [r4, #24]


Question.
Is it necessary to offer an implementation for both single and multiple PortAPI writes and reads?
I only want to use PortAPI.pfWrite8_A0 and PortAPI.pfWrite8_A1.

p.s.
I did configure the ST7735 controller and set background colors when porting from an arduino adafruit library for my TFT.
So spi part is good.

I have figured it out and now it is working!

Thanks a lot for the help so far.

I implemented also the multiple write functions pfWriteM8_A0 and pfWriteM8_A1 and now it works.

I do see that some emwin functions don't work and others do.
GUI_SetBkColor doesnt change the background color while GUI_DispDecAt works correctly.