类似于淘宝的网站建设,iis默认网站停止,工程建设数字化管理平台,图片在线制作网站1、前言
充电LED灯控制是Android设备的基本功能#xff0c;主要用于提示设备的电池状态#xff0c;充电状态#xff0c;满电状态#xff0c;低电状态#xff0c;很多手机厂商还使用呼吸效果来显示#xff0c;普通的低端设备会使用两个LED灯表示#xff0c;红灯表示充电…1、前言
充电LED灯控制是Android设备的基本功能主要用于提示设备的电池状态充电状态满电状态低电状态很多手机厂商还使用呼吸效果来显示普通的低端设备会使用两个LED灯表示红灯表示充电和低电绿灯表示满电。 之前写的文章 《Android充电系统介绍》
2、kernel 层控制充电LED
代码位置主要在kernel/driver/power/power_supply_leds.c /* Battery specific LEDs triggers. */
static void power_supply_update_bat_leds(struct power_supply *psy)
{union power_supply_propval status;unsigned long delay_on 0;unsigned long delay_off 0;if (power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, status))return;dev_dbg(psy-dev, %s %d\n, __func__, status.intval);switch (status.intval) {case POWER_SUPPLY_STATUS_FULL:led_trigger_event(psy-charging_full_trig, LED_FULL);led_trigger_event(psy-charging_trig, LED_OFF);led_trigger_event(psy-full_trig, LED_FULL);led_trigger_event(psy-charging_blink_full_solid_trig,LED_FULL);break;case POWER_SUPPLY_STATUS_CHARGING:led_trigger_event(psy-charging_full_trig, LED_FULL);led_trigger_event(psy-charging_trig, LED_FULL);led_trigger_event(psy-full_trig, LED_OFF);led_trigger_blink(psy-charging_blink_full_solid_trig,delay_on, delay_off);break;default:led_trigger_event(psy-charging_full_trig, LED_OFF);led_trigger_event(psy-charging_trig, LED_OFF);led_trigger_event(psy-full_trig, LED_OFF);led_trigger_event(psy-charging_blink_full_solid_trig,LED_OFF);break;}
}如果想在kernel 层控制led灯就需要在这里修改代码会需要使用到trigger相关的东西要理解什么是trigger可以看下面的链接
https://blog.csdn.net/sgmenghuo/article/details/38322141 trigger主要是做led灯的一些效果的东西默认有default-on 对应打开led的trigger还有none对应关闭LED的trigger。 被[ ]括起来的就是当前trigger的值然后回触发对应trigger的.activate函数。
Trigger的代码位置在 kernel/drivers/leds/trigger
3、framework控制led灯
为了统一控制led接口Android有一个自己的框架控制led灯
Framework-Hal-kernel-hardware
设置对应的LED灯颜色主要在
Framework/base/core/res/res/values/config.xml color nameconfig_defaultNotificationColor#ffffffff/color!-- Default LED on time for notification LED in milliseconds. --integer nameconfig_defaultNotificationLedOn500/integer!-- Default LED off time for notification LED in milliseconds. --integer nameconfig_defaultNotificationLedOff2000/integer!-- Default value for led color when battery is low on charge --integer nameconfig_notificationsBatteryLowARGB0xFFFF0000/integer !-- Default value for led color when battery is medium charged --integer nameconfig_notificationsBatteryMediumARGB0xFFFF0000/integer!-- Default value for led color when battery is fully charged --integer nameconfig_notificationsBatteryFullARGB0xFF00FF00/integer!-- Default value for LED on time when the battery is low on charge in miliseconds --integer nameconfig_notificationsBatteryLedOn125/integer充电状态灯指示状态函数调用
frameworks\base\services\core\java\com\android\server\BatteryService.java
/**
* Synchronize on BatteryService.
*/public void updateLightsLocked() {final int level mBatteryProps.batteryLevel;final int status mBatteryProps.batteryStatus;if (level mLowBatteryWarningLevel) {if (status BatteryManager.BATTERY_STATUS_CHARGING) {// Solid red when battery is chargingmBatteryLight.setColor(mBatteryLowARGB);} else {// Flash red when battery is low and not chargingmBatteryLight.setFlashing(mBatteryLowARGB, Light.LIGHT_FLASH_TIMED,mBatteryLedOn, mBatteryLedOff);}} else if (status BatteryManager.BATTERY_STATUS_CHARGING|| status BatteryManager.BATTERY_STATUS_FULL) {if (status BatteryManager.BATTERY_STATUS_FULL || level 90) {// Solid green when full or charging and nearly fullmBatteryLight.setColor(mBatteryFullARGB);} else {if (isHvdcpPresent()) {// Blinking orange if HVDCP chargermBatteryLight.setFlashing(mBatteryMediumARGB, Light.LIGHT_FLASH_TIMED,mBatteryLedOn, mBatteryLedOn);} else {// Solid orange when charging and halfway fullmBatteryLight.setColor(mBatteryMediumARGB);}}} else {// No lights if not charging and not lowmBatteryLight.turnOff();}}}LightsService 管理LED
frameworks\base\services\core\java\com\android\server\lights\LightsService.java
private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode){//调用JNI函数设置状态setLight_native(mNativePointer, mId, color, mode, onMS, offMS, brightnessMode);}
static void setLight_native(JNIEnv* /* env */, jobject /* clazz */, jlong ptr,jint light, jint colorARGB, jint flashMode, jint onMS, jint offMS, jint brightnessMode){//调用HAL层接口设置指示灯状态devices-lights[light]-set_light(devices-lights[light], state);}获取HAL层接口函数
static jlong init_native(JNIEnv* /* env */, jobject /* clazz */){int err;hw_module_t* module;Devices* devices;devices (Devices*)malloc(sizeof(Devices));err hw_get_module(LIGHTS_HARDWARE_MODULE_ID, (hw_module_t const**)module);if (err 0) {devices-lights[LIGHT_INDEX_BACKLIGHT] get_device(module, LIGHT_ID_BACKLIGHT);devices-lights[LIGHT_INDEX_KEYBOARD] get_device(module, LIGHT_ID_KEYBOARD);devices-lights[LIGHT_INDEX_BUTTONS] get_device(module, LIGHT_ID_BUTTONS);devices-lights[LIGHT_INDEX_BATTERY] get_device(module, LIGHT_ID_BATTERY);devices-lights[LIGHT_INDEX_NOTIFICATIONS] get_device(module, LIGHT_ID_NOTIFICATIONS);devices-lights[LIGHT_INDEX_ATTENTION] get_device(module, LIGHT_ID_ATTENTION);devices-lights[LIGHT_INDEX_BLUETOOTH] get_device(module, LIGHT_ID_BLUETOOTH);devices-lights[LIGHT_INDEX_WIFI] get_device(module, LIGHT_ID_WIFI);} else {memset(devices, 0, sizeof(Devices));}return (jlong)devices;}中间层的代码位置主要在
Hardware/rockchip/liblight/
一个字节对应一种颜色一共有三个颜色想最终控制颜色就需要修改上面说的xml文件比如0x00ffffff,表示红蓝绿三个灯同时亮。具体代码如下
int set_battery_light(struct light_device_t* dev, struct light_state_t const* state)
{ int err 0; char red,blue,green; unsigned int colorRGB state-color 0x00ffffff;red (colorRGB 16) 0xFF; green (colorRGB 8) 0xFF; blue colorRGB 0xFF; pthread_mutex_lock(g_lock); LOGI(weiqifa set_battery_light 0x%x,state-color);err write_int(RED_LED_PATH, red?1:0);err write_int(BLUE_LED_PATH, blue?1:0);err write_int(GREEN_LED_PATH, green?1:0);pthread_mutex_unlock(g_lock); return 0;
} 然后控制的主要是led的设备节点led的设备节点主要是驱动层生成代码的位置如下kernel/driver/leds/
#define RED_LED_PATH sys/class/leds/red/brightness #define GREEN_LED_PATH sys/class/leds/green/brightness #define BLUE_LED_PATH sys/class/leds/blue/brightnessLed驱动对应的dts代码如下 leds: gpio-leds {compatible gpio-leds;led-green {┊ label green;gpios gpio7 8 GPIO_ACTIVE_HIGH;inux,default-trigger timer;default-state off;}; led-blue {┊ label blue;gpios gpio7 14 GPIO_ACTIVE_HIGH;inux,default-trigger timer;default-state off;}; led-red {┊ label red;gpios gpio7 15 GPIO_ACTIVE_HIGH;inux,default-trigger timer; default-state off;};}; 里面的linux,default-trigger 表示默认的trigger模式如果设置为none就是表示关闭现在我们的代码设置为timer表示用定时器的模式实际上我们没有编译定时器模式所以设置并没有生效。 欢迎关注微信公众号-嵌入式Linux
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