- 設(shè)備樹文件
kernel/arch/arm/boot/dts/rk3506b-luckfox-lyra-pi-w.dts
2.引腳圖
image.png
- 點(diǎn)屏幕
CLK ==> RM_IO27
MOSI ==> RM_IO26
CS ==> RM_IO25
DC ==> RM_IO24 (GPIO1_B1)
RES ==> RM_IO8 (GPIO0_B0)
BLK ==> RM_IO7 (GPIO0_A7)
&spi0 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&rm_io27_spi0_clk &rm_io26_spi0_mosi &rm_io25_spi0_csn0>;
/* spidev@0 {
compatible = "rockchip,spidev";
spi-max-frequency = <10000000>;
reg = <0>;
};
*/
st7735r@0{
status = "okay";
compatible = "sitronix,st7735r";
reg = <0>;
spi-max-frequency = <60000000>;
fps = <30>;
buswidth = <8>;
debug = <0x7>;
led-gpios = <&gpio0 RK_PA7 GPIO_ACTIVE_HIGH>;//BL
dc-gpios = <&gpio1 RK_PB1 GPIO_ACTIVE_HIGH>; //DC
reset-gpios = <&gpio0 RK_PB0 GPIO_ACTIVE_LOW>; //RES
};
};
./build.sh kernel-config #打開fbtft和st7735r
./build.sh kernel #編譯內(nèi)核
燒錄內(nèi)核
scp上傳ko文件(最快驗(yàn)證方法，也可以打包rootfs重?zé)贿^會比較慢)
scp output/kernel-modules/lib/modules/6.1.99/kernel/drivers/staging/fbtft/fbtft.ko root@192.168.123.100:/lib/modules/6.1.99/kernel/drivers/staging/fbtft/
scp output/kernel-modules/lib/modules/6.1.99/kernel/drivers/staging/fbtft/fb_st7735r.ko root@192.168.123.100:/lib/modules/6.1.99/kernel/drivers/staging/fbtft/
調(diào)試方法
- 確認(rèn)設(shè)備樹節(jié)點(diǎn)是否被匹配
ls /sys/bus/spi/devices/ #應(yīng)該看到類似spi0.0
cat /sys/bus/spi/devices/spi0.0/modalias #應(yīng)該是spi:st7735r
- 手動加載ko
insmod /lib/modules/6.1.99/kernel/drivers/staging/fbtft/fbtft.ko
insmod /lib/modules/6.1.99/kernel/drivers/staging/fbtft/fb_st7735r.ko
