文章目录

  • 硬件分析
  • 一、修改设备树
  • 二、增加Linux驱动配置
  • 三、构建Buildroot文件系统
  • 使用I2c工具调试
  • 意外收获
    • RAW看图软件 7yuv
  • 测试

参考：https://blog.51cto.com/u_15294654/3111978
参考：https://blog.csdn.net/xiangkezhi167810/article/details/112257386

硬件：

  • Linux：linux-zero-5.2.y
  • U-Boot：u-boot-3s-current
  • Buildroot：buildroot-2020.02.4

操作步骤：

  • 修改设备树
  • 增加Linux配置
  • 重新构建一个buildroot文件系统
  • 测试

硬件分析

在Lichee Pi Zero Dock开发板上实现：
由上可以知道：
CSI_SDA：PE22
CSI_SCK：PE21


如上RGB_LCD接口与CSI摄像头接口无法同时使用！！

一、修改设备树

sun8i-v3s.dtsi

     // camera use for 20220709csi1: csi@1cb4000 {compatible = "allwinner,sun8i-v3s-csi";reg = <0x01cb4000 0x1000>;interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;clocks = <&ccu CLK_BUS_CSI>,<&ccu CLK_CSI1_SCLK>,<&ccu CLK_DRAM_CSI>;clock-names = "bus", "mod", "ram";resets = <&ccu RST_BUS_CSI>;status = "disabled";};pio: pinctrl@1c20800 {compatible = "allwinner,sun8i-v3s-pinctrl";reg = <0x01c20800 0x400>;interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;clocks = <&ccu CLK_BUS_PIO>, <&osc24M>, <&osc32k>;clock-names = "apb", "hosc", "losc";gpio-controller;#gpio-cells = <3>;interrupt-controller;#interrupt-cells = <3>;emac_rgmii_pins: emac-rgmii-pins {pins = "PD0", "PD1", "PD2", "PD3", "PD4","PD5", "PD7", "PD8", "PD9", "PD10","PD12", "PD13", "PD15", "PD16", "PD17";function = "emac";drive-strength = <40>;};i2c0_pins: i2c0-pins {pins = "PB6", "PB7";function = "i2c0";};pwm0_pins: pwm0 {pins = "PB4";function = "pwm0";};pwm1_pins: pwm1{pins = "PB5";function = "pwm1";};uart0_pb_pins: uart0-pb-pins {pins = "PB8", "PB9";function = "uart0";};lcd_rgb666_pins_a: lcd-rgb666-pe {pins = "PE0", "PE1", "PE2", "PE3", "PE4", "PE5","PE6", "PE7", "PE8", "PE9", "PE10", "PE11","PE12", "PE13", "PE14", "PE15", "PE16", "PE17","PE18", "PE19", "PE23", "PE24";function = "lcd";};mmc0_pins: mmc0-pins {pins = "PF0", "PF1", "PF2", "PF3","PF4", "PF5";function = "mmc0";drive-strength = <30>;bias-pull-up;};mmc1_pins: mmc1-pins {pins = "PG0", "PG1", "PG2", "PG3","PG4", "PG5";function = "mmc1";drive-strength = <30>;bias-pull-up;};spi0_pins: spi0-pins {pins = "PC0", "PC1", "PC2", "PC3";function = "spi0";};/*******camera use for 20220709 start************/csi1_8bit: csi1-8bit@0 {pins     = "PE6","PE7","PE8","PE9","PE10","PE11","PE12","PE13","PE14","PE15";bias-disable;function = "csi";};csi1_clk: csi1-clk@0 {pins = "PE0","PE2","PE3";bias-disable;function = "csi";};csi1_mclk: csi1-mclk@0 {pins = "PE1";bias-disable;function = "csi";};i2c1_pins: i2c1 {pins = "PE21", "PE22";function = "i2c1";};/***********camera use for 20220709 end**********/};

sun8i-v3s-licheepi-zero-dock.dts

/**************dvp camera use for 20220709 start************/
&csi1 {status = "okay";pinctrl-names = "default";pinctrl-0 = <&csi1_clk &csi1_8bit>;port {csi1_ep: endpoint {remote-endpoint = <&ov2640_0>;hsync-active = <0>;vsync-active = <0>;bus-width = <10>;pclk-sample = <1>;};//  csi1_ep: endpoint {//            remote-endpoint = <&ov7725_0>;//          hsync-active = <0>;//             vsync-active = <1>;//             bus-width = <8>;//            pclk-sample = <1>;//          };};};&i2c1 {pinctrl-0 = <&i2c1_pins>;pinctrl-names = "default";status = "okay";// ov7725: camera@21 {//     compatible = "ovti,ov7725";//  reg = <0x21>;//   pinctrl-names = "default";//   pinctrl-0 = <&csi1_mclk>;//    clocks = <&ccu CLK_CSI1_MCLK>;//   clock-names = "xclk";//    assigned-clocks = <&ccu CLK_CSI1_MCLK>;//  assigned-clock-rates = <24000000>;//    port {//         ov7725_0: endpoint {//           remote-endpoint = <&csi1_ep>;//            //bus-width = <10>;//       };//  };// };ov2640: camera@30 {compatible = "ovti,ov2640";reg = <0x30>;pinctrl-names = "default";pinctrl-0 = <&csi1_mclk>;clocks = <&ccu CLK_CSI1_MCLK>;clock-names = "xvclk";assigned-clocks = <&ccu CLK_CSI1_MCLK>;assigned-clock-rates = <24000000>;port {ov2640_0: endpoint {remote-endpoint = <&csi1_ep>;bus-width = <10>;};};};
};
/**************dvp camera use for 20220709 end************/

编译设备树：make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- dtbs

二、增加Linux驱动配置

Linux源码根目录下运行命令：

make clean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- licheepi_zero_defconfig
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16


三、构建Buildroot文件系统

  • ffmpeg
  • fswebcam

使用I2c工具调试

可以用 i2ctools 里面的 i2cdetect 检测摄像头是否存在

# i2cdetect -y 10  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
# i2cdetect -y 00  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
#

各种折腾后终于出现了

# i2cdetect -y 10  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

成功的上电信息

U-Boot SPL 2017.01-rc2 (May 31 2022 - 23:43:42)
DRAM: 64 MiB
Trying to boot from MMC1U-Boot 2017.01-rc2 (May 31 2022 - 23:43:42 +0800) Allwinner TechnologyCPU:   Allwinner V3s (SUN8I 1681)
Model: Lichee Pi Zero
DRAM:  64 MiB
MMC:   SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environmentSetting up a 800x480 lcd console (overscan 0x0)
dotclock: 33000kHz = 33000kHz: (1 * 3MHz * 66) / 6
In:    serial@01c28000
Out:   serial@01c28000
Err:   serial@01c28000U-Boot 2017.01-rc2 (May 31 2022 - 23:43:42 +0800) Allwinner TechnologyCPU:   Allwinner V3s (SUN8I 1681)
Model: Lichee Pi Zero
DRAM:  64 MiB
MMC:   SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environmentSetting up a 800x480 lcd console (overscan 0x0)
dotclock: 33000kHz = 33000kHz: (1 * 3MHz * 66) / 6
In:    serial@01c28000
Out:   serial@01c28000
Err:   serial@01c28000
Net:   No ethernet found.
starting USB...
No controllers found
Hit any key to stop autoboot:  0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
reading /boot.scr
282 bytes read in 15 ms (17.6 KiB/s)
## Executing script at 41900000
reading zImage
4152248 bytes read in 213 ms (18.6 MiB/s)
reading sun8i-v3s-licheepi-zero-dock.dtb
12748 bytes read in 26 ms (478.5 KiB/s)
## Flattened Device Tree blob at 41800000Booting using the fdt blob at 0x41800000Loading Device Tree to 42df9000, end 42dff1cb ... OK
Cannot setup simplefb: node not foundStarting kernel ...[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.2.0-licheepi-zero (liefyuan@ubuntu) (gcc version 4.9.4 (Linaro GCC 4.9-2017.01)) #7 SMP Sun Jul 10 23:54:29 CST 2022
[    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: Lichee Pi Zero with Dock
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] percpu: Embedded 16 pages/cpu s34560 r8192 d22784 u65536
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 16256
[    0.000000] Kernel command line: console=ttyS0,115200 root=/dev/mmcblk0p2 rootwait panic=10 earlyprintk rw
[    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 55060K/65536K available (6144K kernel code, 289K rwdata, 1668K rodata, 1024K init, 252K bss, 10476K reserved, 0K cma-reserved, 0K highmem)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] rcu:     RCU event tracing is enabled.
[    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=1.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] random: get_random_bytes called from start_kernel+0x2f8/0x48c with crng_init=0
[    0.000000] arch_timer: cp15 timer(s) running at 24.00MHz (virt).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x588fe9dc0, max_idle_ns: 440795202592 ns
[    0.000008] sched_clock: 56 bits at 24MHz, resolution 41ns, wraps every 4398046511097ns
[    0.000020] Switching to timer-based delay loop, resolution 41ns
[    0.000219] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[    0.000463] Console: colour dummy device 80x30
[    0.000521] Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=240000)
[    0.000537] pid_max: default: 32768 minimum: 301
[    0.000700] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.000716] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.001531] CPU: Testing write buffer coherency: ok
[    0.002060] /cpus/cpu@0 missing clock-frequency property
[    0.002087] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.002881] Setting up static identity map for 0x40100000 - 0x40100060
[    0.003089] rcu: Hierarchical SRCU implementation.
[    0.003626] smp: Bringing up secondary CPUs ...
[    0.003648] smp: Brought up 1 node, 1 CPU
[    0.003657] SMP: Total of 1 processors activated (48.00 BogoMIPS).
[    0.003665] CPU: All CPU(s) started in SVC mode.
[    0.004748] devtmpfs: initialized
[    0.008397] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
[    0.008720] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.008752] futex hash table entries: 256 (order: 2, 16384 bytes, linear)
[    0.009001] pinctrl core: initialized pinctrl subsystem
[    0.010166] NET: Registered protocol family 16
[    0.010696] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.011923] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.011942] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.035912] SCSI subsystem initialized
[    0.036100] usbcore: registered new interface driver usbfs
[    0.036161] usbcore: registered new interface driver hub
[    0.036263] usbcore: registered new device driver usb
[    0.036489] mc: Linux media interface: v0.10
[    0.036528] videodev: Linux video capture interface: v2.00
[    0.036773] Advanced Linux Sound Architecture Driver Initialized.
[    0.038063] clocksource: Switched to clocksource arch_sys_counter
[    0.050446] NET: Registered protocol family 2
[    0.051295] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
[    0.051337] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.051364] TCP bind hash table entries: 1024 (order: 1, 8192 bytes, linear)
[    0.051388] TCP: Hash tables configured (established 1024 bind 1024)
[    0.051541] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[    0.051596] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[    0.051906] NET: Registered protocol family 1
[    0.053837] Initialise system trusted keyrings
[    0.054221] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[    0.091499] Key type asymmetric registered
[    0.091523] Asymmetric key parser 'x509' registered
[    0.091629] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
[    0.091643] io scheduler mq-deadline registered
[    0.091650] io scheduler kyber registered
[    0.092688] sun4i-usb-phy 1c19400.phy: Couldn't request ID GPIO
[    0.096547] sun8i-v3s-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[    0.097017] sun8i-v3s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pb not found, using dummy regulator
[    0.167079] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[    0.170636] printk: console [ttyS0] disabled
[    0.190953] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 37, base_baud = 1500000) is a U6_16550A
[    0.697756] printk: console [ttyS0] enabled
[    0.727134] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.733764] ehci-platform: EHCI generic platform driver
[    0.739291] ehci-platform 1c1a000.usb: EHCI Host Controller
[    0.744902] ehci-platform 1c1a000.usb: new USB bus registered, assigned bus number 1
[    0.752904] ehci-platform 1c1a000.usb: irq 26, io mem 0x01c1a000
[    0.788077] ehci-platform 1c1a000.usb: USB 2.0 started, EHCI 1.00
[    0.795319] hub 1-0:1.0: USB hub found
[    0.799290] hub 1-0:1.0: 1 port detected
[    0.803921] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.810249] ohci-platform: OHCI generic platform driver
[    0.815802] ohci-platform 1c1a400.usb: Generic Platform OHCI controller
[    0.822527] ohci-platform 1c1a400.usb: new USB bus registered, assigned bus number 2
[    0.830491] ohci-platform 1c1a400.usb: irq 27, io mem 0x01c1a400
[    0.903204] hub 2-0:1.0: USB hub found
[    0.907044] hub 2-0:1.0: 1 port detected
[    0.914442] usbcore: registered new interface driver usb-storage
[    0.921774] input: 1c22800.lradc as /devices/platform/soc/1c22800.lradc/input/input0
[    0.931108] sun6i-rtc 1c20400.rtc: registered as rtc0
[    0.936173] sun6i-rtc 1c20400.rtc: RTC enabled
[    0.940914] i2c /dev entries driver
[    0.945914] input: ns2009_ts as /devices/platform/soc/1c2ac00.i2c/i2c-0/0-0048/input/input1
[    0.954949] sun8i-v3s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pe not found, using dummy regulator
[    0.968494] ov2640 1-0030: ov2640 Product ID 26:42 Manufacturer ID 7f:a2
[    0.975209] i2c i2c-1: OV2640 Probed
[    0.981754] sunxi-wdt 1c20ca0.watchdog: Watchdog enabled (timeout=16 sec, nowayout=0)
[    0.990488] sun8i-v3s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pf not found, using dummy regulator
[    1.026966] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 16384 KB
[    1.034281] sun8i-v3s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pg not found, using dummy regulator
[    1.069095] sunxi-mmc 1c10000.mmc: initialized, max. request size: 16384 KB
[    1.077208] usbcore: registered new interface driver usbhid
[    1.082879] usbhid: USB HID core driver
[    1.089091] sun4i-codec 1c22c00.codec: ASoC: codec-analog@01c23000 not registered
[    1.096596] sun4i-codec 1c22c00.codec: Failed to register our card
[    1.104161] Initializing XFRM netlink socket
[    1.108592] NET: Registered protocol family 17
[    1.113693] Registering SWP/SWPB emulation handler
[    1.119763] Loading compiled-in X.509 certificates
[    1.131462] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regulator
[    1.142959] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[    1.148811] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 3
[    1.158534] hub 3-0:1.0: USB hub found
[    1.162464] hub 3-0:1.0: 1 port detected
[    1.169009] debugfs: Directory '1c22c00.codec' with parent 'V3s Audio Codec' already present!
[    1.177558] sun4i-codec 1c22c00.codec: ASoC: Failed to create component debugfs directory: -17
[    1.187657] sun4i-codec 1c22c00.codec: Codec <-> 1c22c00.codec mapping ok
[    1.195003] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.204437] sun6i-rtc 1c20400.rtc: setting system clock to 1970-01-01T00:00:05 UTC (5)
[    1.212778] vcc5v0: disabling
[    1.215756] ALSA device list:
[    1.218785]   #0: V3s Audio Codec
[    1.222988] mmc0: new high speed SDHC card at address 1234
[    1.230765] mmcblk0: mmc0:1234 SA32G 29.1 GiB
[    1.237685]  mmcblk0: p1 p2
[    1.264226] random: fast init done
[    1.284676] EXT4-fs (mmcblk0p2): recovery complete
[    1.290566] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    1.298848] VFS: Mounted root (ext4 filesystem) on device 179:2.
[    1.306699] devtmpfs: mounted
[    1.310953] Freeing unused kernel memory: 1024K
[    1.315631] Run /sbin/init as init process
[    1.432930] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
Starting syslogd: OK
Starting klogd: OK
Running sysctl: OK
Starting mdev... OK
modprobe: can't change directory to '5.2.0-licheepi-zero': No such file or directory
Initializing random number generator: OK
Saving random seed: [    2.895596] random: dd: uninitialized urandom read (512 bytes read)
OK
Starting system message bus: [    2.956060] random: dbus-uuidgen: uninitialized urandom read (12 bytes read)
[    2.963489] random: dbus-uuidgen: uninitialized urandom read (8 bytes read)
done
Starting network: OK
Starting dhcpcd...
no valid interfaces found
no interfaces have a carrier
forked to background, child pid 149
#

意外收获

RAW看图软件 7yuv

测试

视频录制：

ffmpeg -f video4linux2 -s 800x600 -r 30 -i /dev/video0 test.avi

ffmpeg -f v4l2 -s 800x600 -r 30 -i /dev/video0 test.avi

拍摄照片：

fswebcam -S 20 -d /dev/video0 -p UYVY -r 800x600 --dumpframe dump.bin fswebcam.jpg
fswebcam -S 1 -d /dev/video0 -p UYVY -r 800x600 test.jpg

不知道为啥，照片有横纹：

全志V3s学习记录（13）OV2640的使用相关推荐

  1. 【目录】全志V3S学习记录

    全志V3s从一次接触到现在已经有两年了!现在复盘一下! 使用的硬件开发板有: Lichee zero Lichee zero dock CherryPi PC V3s Mangopi v3s SINV ...

  2. 全志V3s学习记录（5）uboot：传参（boot.scr）参数配置（script.bin）

    文章目录 一.boot.scr的简介与制作 1.1 BSP内核配置 1.2 主线内核配置 1.3 使用mkimage工具 使用mkimage生成boot.scr 拷贝boot.scr到启动卡的第一分区 ...

  3. 全志V3s学习记录（4）uboot：开机logo

    文章目录 一.制作JPG图片并处理成BMP格式 二.修改开机LOGO 增加logo显示配置 三.logo居中 参考: 全志v3s学习笔记(3)--u-boot开机logo替换 参考: 开机logo替换 ...

  4. 全志V3s学习记录（1）资料汇总

    文章目录 一.相关网站论坛 二.开发环境分类 2.1 Camdriod官方SDK 2.2 主线Uboot + Bsp内核 2.3 主线Uboot + 主线Linux 三.芯片资源介绍 3.1 Lich ...

  5. 全志V3s学习记录--ESP8089的使用

    文章目录 一.构建一些Networking相关的工具 二.STA模式--连接WiFi 2.1 加载模块 2.2 打开wlan0 2.3 连接WiFi(wpa_supplicant) 第一步:编辑`vi ...

  6. springboot @cacheable不起作用_Springboot学习记录13 使用缓存：整合redis

    本学习记录的代码,部分参考自gitee码云的如下工程.这个工程有详尽的Spingboot1.x教程.鸣谢! https://gitee.com/didispace/SpringBoot-Learnin ...

  7. 全志v3s学习笔记（1）——基础简介及资料

    资料: 荔枝派资料下载站 荔枝派Zero 用户指南 荔枝派github 荔枝派中文论坛 荔枝派Zero指南-看云 坑网 开发环境分类: (参考:Zero的开发环境分类) 1.Camdriod 官方SD ...

  8. 全志v3s学习笔记（5）——主线Linux编译与烧录

    一.安装交叉编译环境 交叉编译环境跟uboot使用的一样. 参考:arm-linux-gnueabihf 交叉编译工具链安装 二.下载linux源码 # 默认是zero-4.10.y分支: git c ...

  9. 量子信息-学习记录13

    ch.13. 量子计算机的物理实现(续) 量子计算机的基本事实   定义:τQ\tau_QτQ​是量子系统在抵抗量子噪声,并维持自身的量子特性时所能够持续的最短时间 τQ=min⁡{T1,T2}\ta ...

最新文章

  1. 安卓饼状图设置软件_话单及银行卡交易智能分析软件
  2. RIM更新PlayBook基于QNX的操作系统
  3. 79. Word Search
  4. python从入门到精通书-Python从入门到精通
  5. [New Portal]Windows Azure Virtual Machine (5) 配置VM的Endpoints
  6. linux 获取内核线程数,如何从命令行获取Linux中的CPU /内核数量？
  7. Maven项目中引入spring-test单元测试 @RunWith与@ContextConfigration报错
  8. redis缓存穿透-解决方案
  9. 如何做一个国产数据库(七) 网络传输 java做订阅客户端
  10. 解决pip2安装不成功的问题
  11. 公布几个流氓软件分析报告——哇哇资讯精灵
  12. mysql查询一个表有哪些索引_如何查看某张数据库表上都有哪些索引（转）
  13. system函数 fork函数
  14. python怎么获取lol皮肤名称_英雄联盟手游免费皮肤获取攻略 LOL免费皮肤怎么得...
  15. 深入浅出net泛型编程[转载] - 天轰穿.net/vs2005/ajax入门 - 博客园
  16. SCIEI 英文PAPER投稿经验【转】
  17. 关于自己看百度修改c盘下的用户名，更改了注册表里的profilelist文件，重启后恢复原始桌面并提示注销问题与解决方案。
  18. 大数据时代背景下的商标注册风险及应对方法
  19. 和平精英服务器维护到几点,和平精英停服到几点钟？4月4日停服时间公告[多图]...
  20. Ping通外网但就是不能打开所有网页

热门文章

  1. ABAP-01 SAP基础
  2. javax，java
  3. Matlab系列之数组（矩阵）的生成
  4. 美国软件开发实习生月薪排行榜
  5. BackTrack安装
  6. html 图片纵向拉伸,css如何让图片拉伸？
  7. 大数据平台技术——Scala+Hbase学习
  8. HBase简介及安装
  9. Linux操作系统 - 信号
  10. onehot编码的意义