cd
nano BB-SPI1-01-00A0.dts
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "BB-SPI1-01";
/* version */
version = "00A0";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.31",
"P9.29",
"P9.30",
"P9.28",
"P9.13",
"P9.12",
"spi1";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
pinctrl_spi1: pinctrl_spi1_pins {
pinctrl-single,pins = <
0x190 0x13 /* P9_31 = mcasp0_aclkx.spi1_sclk , OUTPUT_PULLUP | MODE3 */
0x194 0x33 /* P9_29 = mcasp0_fsx.spi1_d0 , INPUT_PULLUP | MODE3 */
0x198 0x13 /* P9_30 = mcasp0_axr0.spi1_d1 , OUTPUT_PULLUP | MODE3 */
0x19c 0x13 /* P9_28 = mcasp0_ahclkr.spi1_cs0 , OUTPUT_PULLUP | MODE3 */
0x164 0x12 /* P9_42 = GPIO0_7 = eCAP0_in_PWM0_out.gpio0[7] , OUTPUT_PULLUP | MODE2 */
>;
};
};
};
fragment@1 {
target = <&spi1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_spi1>;
cs-gpios = <&gpio4 17 0>, <&gpio1 7 0>;
spi1_0{
#address-cells = <1>;
#size-cells = <0>;
compatible = "spidev";
reg = <0>;
spi-max-frequency = <16000000>;
spi-cpha;
};
spi1_1{
#address-cells = <1>;
#size-cells = <0>;
compatible = "spidev";
reg = <1>;
spi-max-frequency = <16000000>;
// Mode 0 (CPOL = 0, CPHA = 0)
};
};
};
};
拷贝粘贴这些内容，然后ctrl+o,回车，保存这个文件。ctr+x,退出。nano编辑器。
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