arm Linux 驱动LED子系统 测试

发布时间:2017-7-1 11:26:36编辑:www.fx114.net 分享查询网我要评论
本篇文章主要介绍了"arm Linux 驱动LED子系统 测试 ",主要涉及到arm Linux 驱动LED子系统 测试 方面的内容,对于arm Linux 驱动LED子系统 测试 感兴趣的同学可以参考一下。

Linux内核在3.0以上引入了设备树概念(具体哪个版本不清楚)在编译内核后需要将与之对应的dtb文件也下载人板子上才能使内核与硬件关联起来。

dtb文件是有dts文件编译后生成的:例如

/* * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. *//* * AM335x Starter Kit * http://www.ti.com/tool/tmdssk3358 *//dts-v1/;#include "am33xx.dtsi"#include <dt-bindings/pwm/pwm.h>/ {    model = "TI AM335x EVM-SK";    compatible = "ti,am335x-evmsk", "ti,am33xx";    cpus {        cpu@0 {            cpu0-supply = <&vdd1_reg>;        };    };    memory {        device_type = "memory";        reg = <0x80000000 0x10000000>; /* 256 MB */    };    vbat: fixedregulator@0 {        compatible = "regulator-fixed";        regulator-name = "vbat";        regulator-min-microvolt = <5000000>;        regulator-max-microvolt = <5000000>;        regulator-boot-on;    };    lis3_reg: fixedregulator@1 {        compatible = "regulator-fixed";        regulator-name = "lis3_reg";        regulator-boot-on;    };    leds {        pinctrl-names = "default";        pinctrl-0 = <&user_leds_s0>;        compatible = "gpio-leds";        led@1 {            label = "zyrD1:green:usr0";            gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;            default-state = "off";        };        led@2 {            label = "zyrD2:green:usr1";            gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;            default-state = "off";        };        led@3 {            label = "zyrD4:green:mmc0";            gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;            linux,default-trigger = "mmc0";            default-state = "off";        };        led@4 {            label = "zyrD3:green:heartbeat";            gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;            linux,default-trigger = "heartbeat";            default-state = "off";        };    };    gpio_buttons: gpio_buttons@0 {        compatible = "gpio-keys";        #address-cells = <1>;        #size-cells = <0>;        switch@1 {            label = "button0";            linux,code = <0x100>;            gpios = <&gpio2 3 GPIO_ACTIVE_HIGH>;        };        switch@2 {            label = "button1";            linux,code = <0x101>;            gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;        };        switch@3 {            label = "button2";            linux,code = <0x102>;            gpios = <&gpio0 30 GPIO_ACTIVE_HIGH>;            gpio-key,wakeup;        };        switch@4 {            label = "button3";            linux,code = <0x103>;            gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;        };    };    backlight {        compatible = "pwm-backlight";        pwms = <&ecap2 0 50000 PWM_POLARITY_INVERTED>;        brightness-levels = <0 58 61 66 75 90 125 170 255>;        default-brightness-level = <8>;    };    sound {        compatible = "ti,da830-evm-audio";        ti,model = "AM335x-EVMSK";        ti,audio-codec = <&tlv320aic3106>;        ti,mcasp-controller = <&mcasp1>;        ti,codec-clock-rate = <24000000>;        ti,audio-routing =            "Headphone Jack",       "HPLOUT",            "Headphone Jack",       "HPROUT";    };};&am33xx_pinmux {    pinctrl-names = "default";    pinctrl-0 = <&gpio_keys_s0 &clkout2_pin>;    user_leds_s0: user_leds_s0 {        pinctrl-single,pins = <            0x10 (PIN_OUTPUT_PULLDOWN | MUX_MODE7)    /* gpmc_ad4.gpio1_4 */            0x14 (PIN_OUTPUT_PULLDOWN | MUX_MODE7)    /* gpmc_ad5.gpio1_5 */            0x18 (PIN_OUTPUT_PULLDOWN | MUX_MODE7)    /* gpmc_ad6.gpio1_6 */            0x1c (PIN_OUTPUT_PULLDOWN | MUX_MODE7)    /* gpmc_ad7.gpio1_7 */        >;    };    gpio_keys_s0: gpio_keys_s0 {        pinctrl-single,pins = <            0x94 (PIN_INPUT_PULLDOWN | MUX_MODE7)    /* gpmc_oen_ren.gpio2_3 */            0x90 (PIN_INPUT_PULLDOWN | MUX_MODE7)    /* gpmc_advn_ale.gpio2_2 */            0x70 (PIN_INPUT_PULLDOWN | MUX_MODE7)    /* gpmc_wait0.gpio0_30 */            0x9c (PIN_INPUT_PULLDOWN | MUX_MODE7)    /* gpmc_ben0_cle.gpio2_5 */        >;    };    i2c0_pins: pinmux_i2c0_pins {        pinctrl-single,pins = <            0x188 (PIN_INPUT_PULLUP | MUX_MODE0)    /* i2c0_sda.i2c0_sda */            0x18c (PIN_INPUT_PULLUP | MUX_MODE0)    /* i2c0_scl.i2c0_scl */        >;    };    uart0_pins: pinmux_uart0_pins {        pinctrl-single,pins = <            0x170 (PIN_INPUT_PULLUP | MUX_MODE0)    /* uart0_rxd.uart0_rxd */            0x174 (PIN_OUTPUT_PULLDOWN | MUX_MODE0)        /* uart0_txd.uart0_txd */        >;    };    clkout2_pin: pinmux_clkout2_pin {        pinctrl-single,pins = <            0x1b4 (PIN_OUTPUT_PULLDOWN | MUX_MODE3)        /* xdma_event_intr1.clkout2 */        >;    };    ecap2_pins: backlight_pins {        pinctrl-single,pins = <            0x19c 0x4    /* mcasp0_ahclkr.ecap2_in_pwm2_out MODE4 */        >;    };    cpsw_default: cpsw_default {        pinctrl-single,pins = <            /* Slave 1 */            0x114 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* mii1_txen.rgmii1_tctl */            0x118 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* mii1_rxdv.rgmii1_rctl */            0x11c (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* mii1_txd3.rgmii1_td3 */            0x120 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* mii1_txd2.rgmii1_td2 */            0x124 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* mii1_txd1.rgmii1_td1 */            0x128 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* mii1_txd0.rgmii1_td0 */            0x12c (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* mii1_txclk.rgmii1_tclk */            0x130 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* mii1_rxclk.rgmii1_rclk */            0x134 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* mii1_rxd3.rgmii1_rd3 */            0x138 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* mii1_rxd2.rgmii1_rd2 */            0x13c (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* mii1_rxd1.rgmii1_rd1 */            0x140 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* mii1_rxd0.rgmii1_rd0 */            /* Slave 2 */            0x40 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a0.rgmii2_tctl */            0x44 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a1.rgmii2_rctl */            0x48 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a2.rgmii2_td3 */            0x4c (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a3.rgmii2_td2 */            0x50 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a4.rgmii2_td1 */            0x54 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a5.rgmii2_td0 */            0x58 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a6.rgmii2_tclk */            0x5c (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a7.rgmii2_rclk */            0x60 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a8.rgmii2_rd3 */            0x64 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a9.rgmii2_rd2 */            0x68 (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a10.rgmii2_rd1 */            0x6c (PIN_INPUT_PULLDOWN | MUX_MODE2)    /* gpmc_a11.rgmii2_rd0 */        >;    };    cpsw_sleep: cpsw_sleep {        pinctrl-single,pins = <            /* Slave 1 reset value */            0x114 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x118 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x11c (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x120 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x124 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x128 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x12c (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x130 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x134 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x138 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x13c (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x140 (PIN_INPUT_PULLDOWN | MUX_MODE7)            /* Slave 2 reset value*/            0x40 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x44 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x48 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x4c (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x50 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x54 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x58 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x5c (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x60 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x64 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x68 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x6c (PIN_INPUT_PULLDOWN | MUX_MODE7)        >;    };    davinci_mdio_default: davinci_mdio_default {        pinctrl-single,pins = <            /* MDIO */            0x148 (PIN_INPUT_PULLUP | SLEWCTRL_FAST | MUX_MODE0)    /* mdio_data.mdio_data */            0x14c (PIN_OUTPUT_PULLUP | MUX_MODE0)            /* mdio_clk.mdio_clk */        >;    };    davinci_mdio_sleep: davinci_mdio_sleep {        pinctrl-single,pins = <            /* MDIO reset value */            0x148 (PIN_INPUT_PULLDOWN | MUX_MODE7)            0x14c (PIN_INPUT_PULLDOWN | MUX_MODE7)        >;    };    mmc1_pins: pinmux_mmc1_pins {        pinctrl-single,pins = <            0x160 (PIN_INPUT | MUX_MODE7) /* spi0_cs1.gpio0_6 */        >;    };    mcasp1_pins: mcasp1_pins {        pinctrl-single,pins = <            0x10c (PIN_INPUT_PULLDOWN | MUX_MODE4) /* mii1_crs.mcasp1_aclkx */            0x110 (PIN_INPUT_PULLDOWN | MUX_MODE4) /* mii1_rxerr.mcasp1_fsx */            0x108 (PIN_OUTPUT_PULLDOWN | MUX_MODE4) /* mii1_col.mcasp1_axr2 */            0x144 (PIN_INPUT_PULLDOWN | MUX_MODE4) /* rmii1_ref_clk.mcasp1_axr3 */        >;    };};&uart0 {    pinctrl-names = "default";    pinctrl-0 = <&uart0_pins>;    status = "okay";};&i2c0 {    pinctrl-names = "default";    pinctrl-0 = <&i2c0_pins>;    status = "okay";    clock-frequency = <400000>;    tps: tps@2d {        reg = <0x2d>;    };    lis331dlh: lis331dlh@18 {        compatible = "st,lis331dlh", "st,lis3lv02d";        reg = <0x18>;        Vdd-supply = <&lis3_reg>;        Vdd_IO-supply = <&lis3_reg>;        st,click-single-x;        st,click-single-y;        st,click-single-z;        st,click-thresh-x = <10>;        st,click-thresh-y = <10>;        st,click-thresh-z = <10>;        st,irq1-click;        st,irq2-click;        st,wakeup-x-lo;        st,wakeup-x-hi;        st,wakeup-y-lo;        st,wakeup-y-hi;        st,wakeup-z-lo;        st,wakeup-z-hi;        st,min-limit-x = <120>;        st,min-limit-y = <120>;        st,min-limit-z = <140>;        st,max-limit-x = <550>;        st,max-limit-y = <550>;        st,max-limit-z = <750>;    };    tlv320aic3106: tlv320aic3106@1b {        compatible = "ti,tlv320aic3106";        reg = <0x1b>;        status = "okay";        /* Regulators */        AVDD-supply = <&vaux2_reg>;        IOVDD-supply = <&vaux2_reg>;        DRVDD-supply = <&vaux2_reg>;        DVDD-supply = <&vbat>;    };};&usb {    status = "okay";    control@44e10620 {        status = "okay";    };    usb-phy@47401300 {        status = "okay";    };    usb@47401000 {        status = "okay";    };};&epwmss2 {    status = "okay";    ecap2: ecap@48304100 {        status = "okay";        pinctrl-names = "default";        pinctrl-0 = <&ecap2_pins>;    };};#include "tps65910.dtsi"&tps {    vcc1-supply = <&vbat>;    vcc2-supply = <&vbat>;    vcc3-supply = <&vbat>;    vcc4-supply = <&vbat>;    vcc5-supply = <&vbat>;    vcc6-supply = <&vbat>;    vcc7-supply = <&vbat>;    vccio-supply = <&vbat>;    regulators {        vrtc_reg: regulator@0 {            regulator-always-on;        };        vio_reg: regulator@1 {            regulator-always-on;        };        vdd1_reg: regulator@2 {            /* VDD_MPU voltage limits 0.95V - 1.26V with +/-4% tolerance */            regulator-name = "vdd_mpu";            regulator-min-microvolt = <912500>;            regulator-max-microvolt = <1312500>;            regulator-boot-on;            regulator-always-on;        };        vdd2_reg: regulator@3 {            /* VDD_CORE voltage limits 0.95V - 1.1V with +/-4% tolerance */            regulator-name = "vdd_core";            regulator-min-microvolt = <912500>;            regulator-max-microvolt = <1150000>;            regulator-boot-on;            regulator-always-on;        };        vdd3_reg: regulator@4 {            regulator-always-on;        };        vdig1_reg: regulator@5 {            regulator-always-on;        };        vdig2_reg: regulator@6 {            regulator-always-on;        };        vpll_reg: regulator@7 {            regulator-always-on;        };        vdac_reg: regulator@8 {            regulator-always-on;        };        vaux1_reg: regulator@9 {            regulator-always-on;        };        vaux2_reg: regulator@10 {            regulator-always-on;        };        vaux33_reg: regulator@11 {            regulator-always-on;        };        vmmc_reg: regulator@12 {            regulator-min-microvolt = <1800000>;            regulator-max-microvolt = <3300000>;            regulator-always-on;        };    };};&mac {    pinctrl-names = "default", "sleep";    pinctrl-0 = <&cpsw_default>;    pinctrl-1 = <&cpsw_sleep>;};&davinci_mdio {    pinctrl-names = "default", "sleep";    pinctrl-0 = <&davinci_mdio_default>;    pinctrl-1 = <&davinci_mdio_sleep>;};&cpsw_emac0 {    phy_id = <&davinci_mdio>, <0>;    phy-mode = "rgmii-txid";};&cpsw_emac1 {    phy_id = <&davinci_mdio>, <1>;    phy-mode = "rgmii-txid";};&mmc1 {    status = "okay";    vmmc-supply = <&vmmc_reg>;    bus-width = <4>;    pinctrl-names = "default";    pinctrl-0 = <&mmc1_pins>;    cd-gpios = <&gpio0 6 GPIO_ACTIVE_HIGH>;};&sham {    status = "okay";};&aes {    status = "okay";};&gpio0 {    ti,no-reset-on-init;};&mcasp1 {        pinctrl-names = "default";        pinctrl-0 = <&mcasp1_pins>;        status = "okay";        op-mode = <0>;          /* MCASP_IIS_MODE */        tdm-slots = <2>;        /* 4 serializers */        serial-dir = <  /* 0: INACTIVE, 1: TX, 2: RX */            0 0 1 2        >;        tx-num-evt = <1>;        rx-num-evt = <1>;};&tscadc {    status = "okay";    tsc {        ti,wires = <4>;        ti,x-plate-resistance = <200>;        ti,coordinate-readouts = <5>;        ti,wire-config = <0x00 0x11 0x22 0x33>;    };};

红色部分为LED子系统调用硬件配置。dtb文件和Linux内核是怎么关联的呢?主要是通过这个参数:compatible = "gpio-leds";

在leds-gpio.c中有相同的参数传递,具体是怎么操作的,没有详细的去了解。

    return priv;err:    for (count = priv->num_leds - 2; count >= 0; count--)        delete_gpio_led(&priv->leds[count]);    return ERR_PTR(-ENODEV);}static const struct of_device_id of_gpio_leds_match[] = {    { .compatible = "gpio-leds", },    {},};#else /* CONFIG_OF_GPIO */static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev){    return ERR_PTR(-ENODEV);}#endif /* CONFIG_OF_GPIO */static int gpio_led_probe(struct platform_device *pdev){    struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);    struct gpio_leds_priv *priv;    int i, ret = 0;

进入内核xxxx/drivers/leds/将led-class.c、led-core.c、leds.h、leds-gpio.c文件拷出来以模块的方法编译出leds-gpio.ko加载入模块中

编译模块的Makfile:

ifneq ($(KERNELRELEASE),)obj-m := leds-gpio.oelseKDIR :=/home/zyr/Source_code/linux-3.14.65/all:    make -C $(KDIR) M=$(PWD) modules ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j8clean:    rm -f *.ko *.o *.mod.o *.mod.c *.symvers *.orderendif

编写led子系统的测试:

1、点亮熄灭LED

[root@zyr-am335x ]#cd /sys/class[root@zyr-am335x class]#lsbdi           hwmon         mem           regulator     ttyblock         i2c-adapter   misc          rtc           ubidma           i2c-dev       mmc_host      scsi_device   udcextcon        input         mtd           scsi_disk     usbmonfirmware      lcd           net           scsi_host     vcgpio          leds          phy           spi_master    vtconsolegraphics      mdio_bus      power_supply  thermal       watchdog[root@zyr-am335x class]#cd leds[root@zyr-am335x leds]#lszyrD1:green:usr0       zyrD3:green:heartbeatzyrD2:green:usr1       zyrD4:green:mmc0[root@zyr-am335x leds]#cd zyrD1\:green\:usr0/[root@zyr-am335x zyrD1:green:usr0]#echo 1 > brightness[root@zyr-am335x zyrD1:green:usr0]#echo 0 > brightness[root@zyr-am335x zyrD1:green:usr0]#

2、也可以编写测试程序LED_zixitong.c

/*********************************************************************       copyright (C) 2014 all rights reserved*            @file: 子系统_led.c*         @Created: 2017-6-27 14:00nd *          @Author: Yinrui Zhu*     @Description: test user leds *     @Modify Date: 2017-6-27 14:00*********************************************************************/#include <stdio.h>#include<stdlib.h>#include<unistd.h>#include<sys/ioctl.h>#include<sys/stat.h>#include<sys/select.h>#include<sys/time.h>#include<fcntl.h>#include<errno.h>#include<linux/input.h>int main(int argc, char *argv[]){    int ledn;    char *tmp;    int keys_fd;    //char timer=6;        tmp = (unsigned char*)malloc(64);        while(1)    {        sprintf(tmp, "echo 1 > /sys/class/leds/zyrD1:green:usr0/brightness");        printf("status led4%d on \n", ledn);        system(tmp);        usleep(1000*500);        sprintf(tmp, "echo 0 > /sys/class/leds/zyrD1:green:usr0/brightness");        printf("status led4%d on \n", ledn);        system(tmp);        usleep(1000*500);                sprintf(tmp, "echo 1 > /sys/class/leds/zyrD2:green:usr1/brightness");        printf("status led3%d on \n", ledn);        system(tmp);        usleep(1000*500);        sprintf(tmp, "echo 0 > /sys/class/leds/zyrD2:green:usr1/brightness");        printf("status led3%d on \n", ledn);        system(tmp);        usleep(1000*500);                    sprintf(tmp, "echo 1 > /sys/class/leds/zyrD3:green:heartbeat/brightness");        printf("status led1%d on \n", ledn);        system(tmp);        usleep(1000*500);        sprintf(tmp, "echo 0 > /sys/class/leds/zyrD3:green:heartbeat/brightness");        printf("status led1%d on \n", ledn);        system(tmp);        usleep(1000*500);                                //sprintf(tmp, "echo 1 > /sys/class/leds/evmsk:green:usr0/brightness");        printf("status led2%d on \n", ledn);        system("echo 1 > /sys/class/leds/zyrD4:green:mmc0/brightness");        usleep(1000*500);        //sprintf(tmp, "echo 0 > /sys/class/leds/evmsk:green:usr0/brightness");        printf("status led2%d on \n", ledn);        system("echo 0 > /sys/class/leds/zyrD4:green:mmc0/brightness");        usleep(1000*500);


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