深海游弋的鱼 – 第 96 页

安卓版的Firefox如何关闭打开某些网页时自动启动本地APP

手机上已经安装了手机淘宝的APP，或者有天猫店铺网店的页面，比如飞歌导航的官网，如果Firefox打开这个网页，就会自动启动手机淘宝APP，导致整个系统非常卡顿。

下面我们看如何关闭这个功能，如下图：

继续阅读安卓版的Firefox如何关闭打开某些网页时自动启动本地APP

HPE iLO 4 用户指南

继续阅读HPE iLO 4 用户指南

CC13x0, CC26x0 SimpleLink ™ Wireless MCU Technical Reference Manual

继续阅读CC13x0, CC26x0 SimpleLink ™ Wireless MCU Technical Reference Manual

MPU6500寄存器相关信息

1.   First read the Register 117.
        Register 117 – Who Am I
        Reset value: 0x70
2. Reset mpu6500
  0x6B,0x80,//Reset the internal registers and restores the default settings. 
  0x68,0x03,//Auto selects the best available clock source – PLL if ready, else use the Internal oscillator(20M)
  0x6a,0x01,//Reset all gyro digital signal path, accel digital signal path, and temp digital signal path. This bit also clears all the sensor registers.
  0x68,0x00,//Internal 20MHz oscillator
  0x6a,0x00
3.Config mpu6500
    Register 25 – Sample Rate Divider (default 1khz)
    SAMPLE_RATE =
    INTERNAL_SAMPLE_RATE / (1 + SMPLRT_DIV)
    where INTERNAL_SAMPLE_RATE = 1kHz
    Register 26 – Configuration //!!
    Disables the FSYNC pin data to be sampled.
    Register 27 – Gyroscope Configuration
    Gyro Full Scale Select: 0x00:250,0x08:500,0x10:1000;0x18:2000  
    Register 28 – Accelerometer Configuration               
    Acc Full Scale select: 0x00:2g,0x08:4g,0x10:8g;0x18:16G   
    Register 29 – Accelerometer Configuration 2 (0x08, Acc Rate = 4KHz)
    Register 106 – User Control (0x10, SPI mode only. ，也可以使用IIC)
    Register 108 – Power Management 2
    0x00(All sensor on:acc;xyz,gyro:xyz)
    最好写入寄存器的值读出来看对不对。
4. 读取加速度和陀螺仪数据
Registers 59 to 64 – Accelerometer Measurements
59：acc_xout_h; 60：acc_xout_l  高位在前
61：acc_yout_h; 62：acc_yout_l
63：acc_zout_h; 64：acc_zout_l
Registers 65 and 66 – Temperature Measurement
65：temp_out_h; 66：temp_out_l
Registers 67 to 72 – Gyroscope Measurements
67：gyro_xout_h; 60：gyro_xout_l  高位在前
61：gyro_yout_h; 62：gyro_yout_l
63：gyro_zout_h; 64：gyro_zout_l
////////////////////////////////
1. 6500时钟选择 
An internal relaxation oscillator(20M) or MEMS oscillators。
2. FIFO : 512 字节，通过配置将什么数据写入FIFO(acc data,temp data,gyro data).
3. Interrupts 通过寄存器配置使能和如何触发。INT pin。
4 。Self-Test ,DMP ,             FactoryCalibration
6.  DLPF: 数字低通滤波器(digital low-pass filter);
7.  FSYNC:Frame synchronization digital input.Connect to GND if unused.
8. Communication with all registers of the device is performed using either I2C at 400kHz or SPI at 1MHz.
9. 16-bit ADCs: +-32768;
10. Auxiliary master I2C bus for reading data from external sensors (e.g. magnetometer)
11. 20MHz SPI serial interface for reading sensor and interrupt registers
 --平放acc z轴 为1g(9.8) ; 如果量程是16g，输出在2048左右（32768/16 = 2048） 
12. 校准，零漂

1. First read the Register 117.

Reset value: 0x70

2. Reset mpu6500

0x6B,0x80,//Reset the internal registers and restores the default settings.

0x68,0x03,//Auto selects the best available clock source – PLL if ready, else use the Internal oscillator(20M)

0x6a,0x01,//Reset all gyro digital signal path, accel digital signal path, and temp digital signal path. This bit also clears all the sensor registers.

0x68,0x00,//Internal 20MHz oscillator

0x6a,0x00

3.Config mpu6500

SAMPLE_RATE =

INTERNAL_SAMPLE_RATE / (1 + SMPLRT_DIV)

where INTERNAL_SAMPLE_RATE = 1kHz

Disables the FSYNC pin data to be sampled.

Gyro Full Scale Select: 0x00:250,0x08:500,0x10:1000;0x18:2000

Acc Full Scale select: 0x00:2g,0x08:4g,0x10:8g;0x18:16G

0x00(All sensor on:acc;xyz,gyro:xyz)

最好写入寄存器的值读出来看对不对。

4. 读取加速度和陀螺仪数据

Registers 59 to 64 – Accelerometer Measurements

59：acc_xout_h; 60：acc_xout_l 高位在前

61：acc_yout_h; 62：acc_yout_l

63：acc_zout_h; 64：acc_zout_l

Registers 65 and 66 – Temperature Measurement

65：temp_out_h; 66：temp_out_l

Registers 67 to 72 – Gyroscope Measurements

67：gyro_xout_h; 60：gyro_xout_l 高位在前

61：gyro_yout_h; 62：gyro_yout_l

63：gyro_zout_h; 64：gyro_zout_l

////////////////////////////////

1. 6500时钟选择

An internal relaxation oscillator(20M) or MEMS oscillators。

2. FIFO : 512 字节，通过配置将什么数据写入FIFO(acc data,temp data,gyro data).

3. Interrupts 通过寄存器配置使能和如何触发。INT pin。

4 。Self-Test ,DMP , FactoryCalibration

6. DLPF: 数字低通滤波器(digital low-pass filter);

7. FSYNC:Frame synchronization digital input.Connect to GND if unused.

8. Communication with all registers of the device is performed using either I2C at 400kHz or SPI at 1MHz.

9. 16-bit ADCs: +-32768;

10. Auxiliary master I2C bus for reading data from external sensors (e.g. magnetometer)

11. 20MHz SPI serial interface for reading sensor and interrupt registers

--平放acc z轴为1g(9.8) ; 如果量程是16g，输出在2048左右（32768/16 = 2048）

12. 校准，零漂

详细的寄存器文档如下：

继续阅读MPU6500寄存器相关信息

macOS High Sierra下的minicom要如何按出 meta key ?

以前常在 Linux 的 Terminal 下使用 minicom 这个小程序来操作 USB to Serial (也就是 USB to RS-232) 来连接「数据采集卡」、Router、Switch 等网络设备

一般 Linux 底下的 minicom 使用 control + <Fn> 来操作一些 minicom 的一些特定功能
例如 control + x 就是 hang up 并退出 minicom

后来换成 OS X 之后的 minicom ，要求使用「meta key」组合键，如下图：

继续阅读macOS High Sierra下的minicom要如何按出 meta key ?

继续阅读Determining RF Angle of Arrival Using COTS Antenna Arrays: A Field Evaluation

ubuntu 16.04规避srsLTE报告”Sequence number synch failure“的BUG

参考ubuntu 16.04系统LimeSDR使用srsLTE搭建LTE实验环境构建实验环境,在实际运行时候，手机设备无法正常连接到基站，报告如下错误信息：

Received Attach Request 
Attach Request -- IMSI-style attach request
Attach Request -- UE is already attached.Attach request -- IMSI: 208920100001100
Attach request -- eNB-UE S1AP Id: 3, MME-UE S1AP Id: 3
Attach request -- Attach type: 2
Attach Request -- UE Network Capabilities EEA: 11110000
Attach Request -- UE Network Capabilities EIA: 11110000
Attach Request -- MS Network Capabilities Present: true
PDN Connectivity Request -- EPS Bearer Identity requested: 0
PDN Connectivity Request -- Procedure Transaction Id: 1
PDN Connectivity Request -- ESM Information Transfer requested: false
Downlink NAS: Sending Authentication Request
Plain UL NAS: Authentication Failure
Sequence number synch failure
Downlink NAS: Sent Authentication Request
DL NAS: Sent Downlink NAS Message. DL NAS Count=0, UL NAS count=1
DL NAS: MME UE S1AP id 3
Plain UL NAS: Authentication Failure
Sequence number synch failure
Downlink NAS: Sent Authentication Request
DL NAS: Sent Downlink NAS Message. DL NAS Count=0, UL NAS count=2
DL NAS: MME UE S1AP id 3
Received UE Context Release Request. MME-UE S1AP Id 3
UE is not ECM connected. No need to release S1-U. MME UE S1AP Id 3
UE is ECM IDLE.

Received Attach Request

Attach Request -- IMSI-style attach request

Attach Request -- UE is already attached.Attach request -- IMSI: 208920100001100

Attach request -- eNB-UE S1AP Id: 3, MME-UE S1AP Id: 3

Attach request -- Attach type: 2

Attach Request -- UE Network Capabilities EEA: 11110000

Attach Request -- UE Network Capabilities EIA: 11110000

Attach Request -- MS Network Capabilities Present: true

PDN Connectivity Request -- EPS Bearer Identity requested: 0

PDN Connectivity Request -- Procedure Transaction Id: 1

PDN Connectivity Request -- ESM Information Transfer requested: false

Downlink NAS: Sending Authentication Request

Plain UL NAS: Authentication Failure

Sequence number synch failure

Downlink NAS: Sent Authentication Request

DL NAS: Sent Downlink NAS Message. DL NAS Count=0, UL NAS count=1

DL NAS: MME UE S1AP id 3

Plain UL NAS: Authentication Failure

Sequence number synch failure

Downlink NAS: Sent Authentication Request

DL NAS: Sent Downlink NAS Message. DL NAS Count=0, UL NAS count=2

DL NAS: MME UE S1AP id 3

Received UE Context Release Request. MME-UE S1AP Id 3

UE is not ECM connected. No need to release S1-U. MME UE S1AP Id 3

UE is ECM IDLE.

初步分析BUG的原因是如下函数在重新生成同步序列号的时候出现错误：

bool resync_sqn_milenage(uint64_t imsi, uint8_t *auts)

1 2	bool resync_sqn_milenage(uint64_t imsi, uint8_t *auts)

目前还在分析，目前出现这个现象的时候，当EPC退出时候，应用一定向user_db.csv回写000000001b02，一旦出现这个数字，我们就没办法注册设备了。

目前的应对办法是把user_db.csv最后的SQN，要比设备最后一次通信记录的数据号大，如果SQN数字复位，可以让设备关机，应该就从0开始了。此问题还在持续跟进中。

作者：默默

安卓版的Firefox如何关闭打开某些网页时自动启动本地APP

HPE iLO 4 用户指南

CC13x0, CC26x0 SimpleLink ™ Wireless MCU Technical Reference Manual

MPU6500寄存器相关信息

macOS High Sierra下的minicom要如何按出 meta key ?

TI Code Composer Studio 7.4查看内存以及闪存的使用情况

Using GNU Radio for Signal Phase Measurements

SDR数模转换芯片相关的技术参数手册

Determining RF Angle of Arrival Using COTS Antenna Arrays: A Field Evaluation

ubuntu 16.04规避srsLTE报告”Sequence number synch failure“的BUG

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