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RSS订阅原创 Fragment Tips
Fragment A+ ViewPager: SensorListFragment + SensorDeviceFramgent ViewpagerFragment B: SensorDetailFragment1. Create A by replace2. Create A by replace + addBackStack3. C
2016-09-02 17:55:47
232
原创 Audio Codec
DECLARE_TLV_DB_SCALE宏定义的mixer control，它所代表的值按一个固定的dB值的步长变化。该宏的第一个参数是要定义变量的名字，第二个参数是最小值，以0.01dB为单位。第三个参数是变化的步长，也是以0.01dB为单位。如果该control处于最小值时会做出mute时，需要把第四个参数设为1。
2016-01-29 15:37:40
1477
原创 lockup detector in kernel
Soft lockup and hardlockupDoc1. 抢占被长时间关闭而导致进程无法调度（soft lockup）2. 中断被长时间关闭而导致更严重的问题（hard lockup）More info please refer to Documentations/lockup_watchdogs.txtCodeImplementedin kernel/watch
2015-07-24 14:56:13
741
原创 spinlock implementation with arm
1 ARCH_SPIN_LOCK /UNLOCKTake armv7 code for example, its codes is much clear and easy tounderstandCodes static inline void arch_spin_lock(arch_spinlock_t *lock){ unsigned long tm
2015-07-22 14:38:04
568
原创 pm runtime management
2. pm runtime introduction2.1 pm_runtimedocumentationDocumentation/power/runtime_pm.txt2.2 RuntimePM Device FieldsCommon for runtime PM status:.runtime_status = RPM_SUSPENDED;.disable
2015-07-16 09:53:03
538
原创 The C program language
1. .h文件中慎定义static变量，否则每一个包含此.h的c文件都会得到一个独立的变量，这可能不是你想要的。
2015-07-08 10:16:01
638
原创 Set up start development environment on ubuntu-12.04.1
1、安装unbutu-12.04.3系统， VMware , Win7 32 bitAttention: 把网线断开，否则安装很慢 ,安装前选定自己的硬件配置（network, mem, display,ect）Problem: I'm installing Ubuntu 12.04 on. So far the last step "Reticulating Splines"
2015-06-29 10:14:35
659
原创 sys node for g sensor KXT_9
This is the gsensor KXT_9 driver sysfs interface, any suggestion is welcomeSysfs NodesAttrDescriptionCommentintervalr/wGet/Set g sensor polling rate
2014-01-03 14:37:10
784
原创 sys interface for mpu9250
This is the gsensor MPU9250 driver sysfs interface according to my understanding; need to ask vendor for more information about sys interfaceSysfs NodesAttrDescriptionC
2014-01-03 14:34:18
1426
原创 Test DMA Module
mount -t debugfs none /sys/kernel/debug/inmod dmatest,ko （Android shell, generic comand no effecte）chmod 777 /sys/kernel/debug/dmatest/*echo dma0chan0 > /sys/kernel/debug/dmatest/channel ec
2013-12-24 16:31:01
1040
Advanced Configuration and Power Interface Specification Revision4.0
2012-09-19
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