Hi All,
I'm trying to get started with TouchGFX.
I'm currently working with a NUCLEO-L496ZG eval board connected to an NHD-2.8-240320AF-CSXP-FT (320 x 240 TFT LCD with ST7789 internal controller.)
I've successfully connected up the display via FMC and been able to display colors and images and such to the screen, just using statements like
*(__IO uint16_t *)(0x60000000) = command;
*(__IO uint16_t *)(0x60020000) = data;
to send data to the command and data registers, and everything seems to be working well.
Now I'm trying to bring in TouchGFX into the mix and I'm having a difficult time. I've read through the board bring up process, and where I think I'm having trouble is knowing which functions to modify from the generated code to integrate the ST7789 driver code I've written.
To give you an idea of what I've tried and what my setup is, here's what my TouchGFX setup looks like in the IOC:
After generating the code, I used TouchGFX designer and opened the ApplicationTemplate.touchgfx.part file and then added a simple splash bitmap to the default screen:
(I know, I could quit being an electrical engineer and draw pictures in paint for a living, right?)
I then generated code, went back to STM32CubeIDE re built with no errors.
On first debug session, nothing happened on the LCD, which makes sense since I hadn't modified any of the generated code. Based on the example here FMC and SPI Display Interface | TouchGFX Documentation I realized I was probably supposed to modify flushFrameBuffer in the TouchGFXHAL.cpp file, so I did so like this:
void TouchGFXHAL::flushFrameBuffer(const touchgfx::Rect& rect)
{
// Set Cursor
TFT_setAddress_WidthHeight(rect.x, rect.y, rect.width, rect.height);
TFT_flushFrameBuffer(frameBuffer0);
}
That didn't make any difference, and I noticed that setting a breakpoint within this function, the flushFrameBuffer function doesn't seemed to get called anyways, and it was at this point that I realized there is too much I don't know/ don't understand. I don't even know of "frameBuffer0" points to the frame buffer I created in the TouchGFX part of the IOC file. According to a note in there, the framebuffer is supposed to be called "framebuf" but the compiler doesn't recognize that.
I realize that I'm missing a big chunk of knowledge here, so please forgive my ignorance. Could someone point me in the right direction?
Hello @BWKidd ,
First of all I have to say that I am quite impressed by your paint masterpiece!
Regarding your TouchGFX issue, I will do my best to assist you.
Can you explain how you were able to display colors and images using FMC.
I assume you wrote the data and commands using the HAL FMC functions. I assume that "0x60000000" is the memory address for the command register that you mentioned in STM32CubeMx in the FMC section (same for data on memory 0x60020000).
1 )
What is your Data size (8 or 16 bits) ?
I think that for 16 bits it should work with FMC interface but for 8 bits it has to be custom and the functions must be modified.
2 )
Let's try first to no modify the generated functions.
Also maybe try with a simple colored box first.
3 )
You can create projects using the H5 boards.
Some uses FMC 8 bits with custom interface, others uses FMC 16 bits with FMC interface :
You could get inspired by those and look if they have something different than yours.
4 )
What is your compiler?
Do you generate code from STM32SubeMx selecting the STM32CubeIde toolchain?
Somehow your "Flash" button (in the bottom right corner) in Designer is not pink, doesn't look clickable, it would be easier in the beginning to flash from Designer
5 )
Also, could you share you ioc file?
Regards,
Edit :
The STM32H573I-DK_EXT-FLASH (the second from the left) that is using 8 bits data and custom interface is using the same driver as you.
Data sheet found on digikey (Digikey link for your screen ) link to the driver datasheet : Driver ST7789V datasheet
And This is the screen used in the application, according to the file TouchGFXHAL.cpp :
You can find the TouchGFXHAL.cpp file in the project folder path ProjectName\TouchGFX\target\.
Find attached a zipped file of the project STM32H573I-DK_EXT-FLASH.
Hello @GaetanGodart ,
Thank you for your complements on my artwork 🙂
I'm using STM32CubeIDE Version 1.14.1, and I'm using TouchGFX Designer 4.23.0. I created my project, ioc, etc using the CubeIDE, and then opened the .part file in Designer to add that bitmap. I see what you mean about the launch button not being clickable. I'll take a look at the sample projects that you sent and try starting a new project from Designer.
To give you a little more detail on how I'm able to communicate with the display using the FMC without using TouchGFX, I've got the FMC setup like so:
Specifically, i'm using 16 bit mode.
My hardware connections are as follows:
To communicate with the display via FMC, I've defined two helper macros:
#define TFT_writeCommand(command) (*(__IO uint16_t *)(0x60000000) = command)
#define TFT_writeData(data) (*(__IO uint16_t *)(0x60020000) = data)
I initialize my display in the setup portion of void main() like so:
HAL_GPIO_WritePin(DISP_RES_GPIO_Port, DISP_RES_Pin, GPIO_PIN_RESET); // Activate Reset (Reset = Low)
HAL_Delay(100);
HAL_GPIO_WritePin(DISP_RES_GPIO_Port, DISP_RES_Pin, GPIO_PIN_SET); // Reset line to HIGH
HAL_Delay(100);
TFT_writeCommand(SLPOUT);//exit SLEEP mode
HAL_Delay(100);
//MADCTL: memory data access control
TFT_writeCommand(MADCTL);
TFT_writeData(MX+MV);
... etc
(i'm happy to provide the full code if that helps, but its just fairly standard ST7789 driver stuff)
And then I can color the screen blue (for instance) by doing something like this:
//X address set
TFT_writeCommand(CASET);
TFT_writeData(0);
TFT_writeData(0);
TFT_writeData(0x01);
TFT_writeData(0x3F);
//Y address set
TFT_writeCommand(RASET);
TFT_writeData(0);
TFT_writeData(0);
TFT_writeData(0);
TFT_writeData(0xEF);
TFT_writeCommand(RAMWR); // Memory Write
const uint16_t colorWord = 0x001F; // RGB565 Blue
for (unsigned long b = 0; b < 320*240; b++) {
TFT_writeData(colorWord);
}
I've attached my IOC file.
It will probably be a few days before I get a chance to dig into those examples and try recreating the project, but when I do, I'll post what I find. Thank you so much for your responses and advice!
