rajadey150@gmail.com wrote: ↑2024-03-21 6:50
Sir i have 3.5 restouch display i want interface with Luckfox Pico Max,so i will do this step
i mean do we require change it manually or we have write our own code
please help in tutorial very confusing
The example on the Wiki
https://wiki.luckfox.com/Luckfox-Pico/RKNN-example/ is implemented using the framebuffer.
1.The software part of SPI communication with the screen is implemented by the kernel, utilizing mmap to map the screen display to a segment of memory. When data is written to this memory segment, the kernel automatically communicates with the screen via SPI to display the data.
2.The hardware pin configuration is also done in the device tree.
Theoretically, using SPI for read/write operations is possible, but it may result in significant efficiency losses, potentially leading to a lower display frame rate. Therefore, it is recommended to configure it as a framebuffer device.
If you intend to use the LCD as an SPI device, you need to make the following modifications:
1.Ensure that the screen can be driven correctly, referring to the tutorial
https://wiki.luckfox.com/Luckfox-Pico/L ... Touch-LCD/；
2.open
/cpp/main.cc in
https://github.com/luckfox-eng29/luckfo ... ce_facenet
3.Remove the parts related to the framebuffer:
Code: Select all
// Delete framebuffer Init
/*
int fb = open("/dev/fb0", O_RDWR);
if(fb == -1)
{
close(fb);
return -1;
}
size_t screensize = FB_HIGHT * FB_WEIGHT * 2;
uint16_t* framebuffer = (uint16_t*)mmap(NULL, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fb, 0);
cv::Mat rgb565Image(240, 240, CV_16UC1);
*/
//Delete img show
/*
cv::resize(bgr, bgr, cv::Size(240,240), 0, 0, cv::INTER_LINEAR);
for (int i = 0; i < bgr.rows; ++i) {
for (int j = 0; j < bgr.cols; ++j) {
uint16_t b = (bgr.at<cv::Vec3b>(i, j)[0] >> 3);
uint16_t g = (bgr.at<cv::Vec3b>(i, j)[1] >> 2) << 5;
uint16_t r = (bgr.at<cv::Vec3b>(i, j)[2] >> 3) << 11;
rgb565Image.at<uint16_t>(i, j) = r | g | b;
framebuffer[i * FB_HIGHT + j] = rgb565Image.at<uint16_t>(i, j);
}
}
*/
4.Replace the deleted parts with LCD screen initialization and image writing operations:
Code: Select all
//LCD Init
if(DEV_ModuleInit() != 0){
DEV_ModuleExit();
exit(0);
}
SD_Init();
LCD_SCAN_DIR lcd_scan_dir = SCAN_DIR_DFT;
LCD_Init(lcd_scan_dir,800);
Paint_CreatImage();
//Show Image(This needs to be self-implemented)
Due to the difference in resolution between the 3.5-inch res-touch display and the Pico-LCD-1.3 used in the example, you need to resize the image to fit using Opencv-mobile for final image display.
if you want to use the screen as a Framebuffer device, you need to make the following modifications:
1.Modify the resolution:
Code: Select all
int width = xxx;
int height = xxx;
2.Modify the resolution after image scaling:
Code: Select all
cv::resize(bgr, bgr, cv::Size(xxx,xxx), 0, 0, cv::INTER_LINEAR);
Due to the model's structure, the input and output images used in the example are square, and no letterbox operation has been done. If you need to input rectangular images, you need to add a letterbox algorithm to ensure the correct flow of the model.
I hope this information is helpful to you. If you encounter any difficulties during the implementation process, feel free to ask for assistance.