F1c100s self made development board debugging process

epidemic situation , After waiting for a long time, the board finally arrived .

What I use here is provided by the pit net boss tiny200 Development kit , Mango pie R3 The configuration file

1, Configure its media , What I use on the board is nor-spi-flash, Therefore, it is necessary to shield the device tree nand-flash Related nodes , Otherwise, there will be errors during startup .

2, Configuration screen , I have been troubled here for a long time , In fact, it only needs to be in uboot Configure the screen parameters inside , The others don't need to be changed , I think it's wrong , To modify panel, It has been changed for a long time. Many parameters are effective , It's a dead end , Finally, I saw the comments of the little friend of keng.com ：F1C100s How to initialize LCD Pin ？24bit How to change it to 18bit.RGB666 How to change it to 565..... / Full ambition SOC / WhyCan Forum( Wow, cool developer community )

linux If you use drm drive , Well then uboot irrelevant .
linux If you use simplefb drive , So that's the use uboot The initialization of the

I suddenly realized , Go directly to uboot Just modify the screen parameters

This is the time , I have another question , these le,ri,up, What is a parameter , After Baidu found the following information ：

U-boot Pass through ENV Set display device （ Such as LCD） Parameter method and format _ Han Banxian's blog -CSDN Blog

/******************************************************************
 *  Parse structure 
 ******************************************************************/
struct ctfb_res_modes {
    int xres; /*  Visible resolution  */
    int yres;
    /*  sequential :  All values are in pixel clock units （ Except, of course, the pixel clock itself ） */
    int pixclock; /*  Pixel clock （ Company ： Microsecond ） */
    int left_margin; /*  The number of pixel clocks synchronized from the row to the left edge of the image  */
    int right_margin; /*  The number of pixel clocks synchronized from the row to the right edge of the image  */
    int upper_margin; /*  The number of lines synchronized from the field to the top edge of the image  */
    int lower_margin; /*  The number of lines from field synchronization to the bottom edge of the image  */
    int hsync_len; /*  Line synchronization time length （ Pixel clocks ） */
    int vsync_len; /*  Field synchronization time length （ Row number ） */
    int sync; /* see FB_SYNC_* */
    int vmode; /* see FB_VMODE_* */
};

  Invalid parameter _lcd Parameter interpretation and refresh rate calculation ,LCD sequential _ Liu Wanxiang ExcelPro The blog of -CSDN Blog

You will know how to set the parameters , And the meaning of parameters .

Finally, let's take a look at the test results ：

3, Switch through console command USB Pattern , Refer to the following post

Thread Linux use shell Command switching OTG( Share )tiny200/licheepi nano|zero Can be used / Full ambition SOC / WhyCan Forum( Wow, cool developer community )

&usb_otg {
        dr_mode = "otg"; /*  Three options : otg / host / peripheral */
        status = "okay";
};

## Switch to host Pattern :
# echo host > /sys/devices/platform/soc/1c13000.usb/musb-hdrc.1.auto/mode
# [  117.758152] phy phy-1c13400.phy.0: Changing dr_mode to 1
[  118.414817] usb 1-1: new high-speed USB device number 3 using musb-hdrc
[  118.598193] usb-storage 1-1:1.0: USB Mass Storage device detected
[  118.611789] scsi host0: usb-storage 1-1:1.0
[  119.686198] scsi 0:0:0:0: Direct-Access     Mass     Storage Device   1.00 PQ: 0 ANSI: 0 CCS
[  119.703976] sd 0:0:0:0: [sda] 3842048 512-byte logical blocks: (1.97 GB/1.83 GiB)
[  119.725260] sd 0:0:0:0: Attached scsi generic sg0 type 0
[  119.739844] sd 0:0:0:0: [sda] Write Protect is off
[  119.771819] sd 0:0:0:0: [sda] No Caching mode page found
[  119.777288] sd 0:0:0:0: [sda] Assuming drive cache: write through
[  119.801571]  sda: sda1 sda2 sda3
[  119.817224] sd 0:0:0:0: [sda] Attached SCSI removable disk

#
## Switch to device Pattern :
# echo peripheral > /sys/devices/platform/soc/1c13000.usb/musb-hdrc.1.auto/mode
[  123.880272] phy phy-1c13400.phy.0: Changing dr_mode to 2
# [  123.890905] usb 1-1: USB disconnect, device number 3

The next step is to debug the camera .