licheepi nano(f1c100s)驱动st7789v的tft屏幕，内核打印成功加载了，在dev/目录下也有fb0节点，但是echo > /dev/fb0无任何反应，屏幕只是一直有很暗的光，那位大佬遇到过类似的问题吗？
root@lichee:~# ls -l /dev/fb0
crw-rw---- 1 root video 29, 0 May 27 21:02 /dev/fb0
root@lichee:~# echo 11111111111111111111111 > /dev/fb0
// 屏幕无任何反应内核打印：
[ 2.498064] usbhid: USB HID core driver
[ 2.502139] fbtft_of_value: buswidth = 8
[ 2.506165] fbtft_of_value: debug = 0
[ 2.509831] fbtft_of_value: rotate = 90
[ 2.513662] fbtft_of_value: fps = 30
[ 3.264917] sunxi-mmc 1c0f000.mmc: fatal err update clk timeout
[ 4.014923] sunxi-mmc 1c0f000.mmc: fatal err update clk timeout
[ 4.964919] sunxi-mmc 1c0f000.mmc: fatal err update clk timeout
[ 5.192597] Console: switching to colour frame buffer device 30x16
[ 5.200044] graphics fb0: fb_st7789v frame buffer, 240x135, 63 KiB video memory, 4 KiB buffer memory, fps=33, spi1.0 at 32 MHz
[ 5.225619] NET: Registered protocol family 17离线