E9V2 PWM 扩展口怎么应用,linux4.1内核
麻烦你们能给一个,E9V2 PWM 扩展口的应用实例吗?linux4.1内核谢谢了 修改内核源码中arch/arm/boot/dts/imx6qdl-sabresd.dtsi(imx6q corec),arch/arm/boot/dts/e9qdl-sabresd.dtsi(e9卡片电脑),
在&pwm1下添加,搜索pwm1可以搜索到
&pwm1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm1>;
status = "okay";
};
&pwm2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm2>;
status = "okay";
};
&pwm3 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm3>;
status = "okay";
};
在pinctrl_pwm1下面添加,搜索pinctrl_pwm1可以搜索到
pinctrl_pwm1: pwm1grp {
fsl,pins = <
MX6QDL_PAD_SD1_DAT3__PWM1_OUT 0x1b0b1
>;
};
pinctrl_pwm2: pwm2grp {
fsl,pins = <
MX6QDL_PAD_SD1_DAT2__PWM2_OUT 0x1b0b1
>;
};
pinctrl_pwm3: pwm3grp {
fsl,pins = <
MX6QDL_PAD_SD1_DAT1__PWM3_OUT 0x1b0b1
>;
}; 控制pwm
对应pwm2:
echo 0 > /sys/class/pwm/pwmchip2/export
对应pwm3:
echo 0 > /sys/class/pwm/pwmchip3/export
c). 设置PWM 周期和占空比,这里均为时间,单位为ns
echo 1000000000 > /sys/class/pwm/pwmchip2/pwm0/period
echo 500000000 > /sys/class/pwm/pwmchip2/pwm0/duty_cycle
使能pwm
echo 1 > /sys/class/pwm/pwmchip2/pwm0/enable support_lyl 发表于 2017-9-26 15:08
控制pwm
对应pwm2:
echo 0 > /sys/class/pwm/pwmchip2/export
可以了,给你32赞{:2_148:} jamesRobort 发表于 2017-9-26 18:55
可以了,给你32赞
你是怎么升级到4.1内核的?
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