'Ze Odyssey Of The Removed Keys Mac OS

'Ze Odyssey Of The Removed Keys Mac OS

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The Odyssey (Mac abandonware from 1994) To date, Macintosh Repository served 1392345 old Mac files, totaling more than 273335.8GB!
1 Open an elevated command prompt. 2 Copy and paste the slmgr /upk command into the elevated command prompt, and press keyEnter /kry to uninstall the product key. (see screenshot below) 3 Click/tap on OK when the product key has successfully been uninstalled. (see screenshot below).
On an Intel-based Mac: Choose Apple menu  Restart, then immediately press and hold one of these key combinations, depending on what you want to do, until you see a spinning globe appear: Install the latest version of macOS compatible with your computer: Press and hold Option-Command-R.
The Odyssey (Mac abandonware from 1994) To date, Macintosh Repository served 1392345 old Mac files, totaling more than 273335.8GB! I would get DiskWarrior. Get the physical disk because you will need to boot from it. You can try to salvage your files by connecting your mac to another via firewire and see if you can boot your mac into target disk mode. If successful on that you can pull of the files you want to save because if D.
editThe ODYSSEY – STM32MP157C is a single board computer that based on STM32MP157C, a dual-core Arm-Cortex-A7 core processor operating at 650Mhz. The processor also integrates an Arm Cortex-M4 coprocessor, which makes it suitable for real-time task. The ODYSSEY – STM32MP157C is created in a form of SoM(system on module) plus a Carrier board. The SoM has consisted of the MPU, PMIC, RAM and the carrier board is in Raspberry Pi form factor. The carries board includes all the necessary peripherals including Gigabytes Ethernet, WiFi/BLE, DC Power，USB Hosts, USB-C, MIPI-DSI, DVP for camera, audio, etc. With this board, customers can fast evaluate the SoM and deploy the SoM on their own carrier board easily and quickly.
Features¶Dual-core Arm-Cortex-A7 core processor with Cortex-M4 integrated
SoM(system on module) includes MPU, PMIC, RAM. 
Raspberry Pi 40-Pin Compatible Carrier Board.
Compact size and powerful
open source hardware/SDK/API/BSP/OS
Specification¶ItemValues
Peripheral Interface2 x USB Host
1 x gigabit Ethernet interface
1 x 3.5mm audio interface
1 x MIPI DSI display interface
1 x DVP camera interface
2 x Grove (GPIO & I2C)
1 x SD card interface (on the back of the board)
WiFi/BluetoothWiFi 802.11 b/g/n 2.4GHz
Bluetooth 4.1
On-board LED1 x reset LED
3 x user-defined LED
1 x power LED
Power1 x DC interface (12V/2A power input is recommended)
1 x USB Type - C
Button1 x reset button
1 x user button
1 x dial code key
dimension56mm x 85mm
Operating temperature0 ~ 75 ℃
Application¶Industrial (CAN-Ethernet gateways etc )
White goods(refrigerators,microwaves etc )
Medical(data loggers etc)
High-end wearables(VR device etc)
Smart Home Devices
Hardware Overview¶ODYSSEY – STM32MP157C consists of two parts: Carrier board and Seeed SoM - STM32MP157C.
Carrier board hardware details follow:
1.Carrier board : Install the Seeed SoM-STM32MP157C area, if the user wants to remove the core board, slowly tilt the core board up and then remove, never remove by hand.
2.DC Power Input Port : 12V~24V/2A (12V/2A power input is recommended)(5.5x2.1mm center-positive barrel).
3.ETH Interface : Network cable interface can be connected to gigabit level network.
4.USB Host: Two USB Host ports.
5.USB Device: USB 2.0 Type C. If Type C is used as board power input, a 5V/3A power adapter should be used.
6.Digital Grove Interface: Connect the Grove interface to the digital pin. 
7.IIC Grove Interface: Connect the Grove interface to the IIC pin.
8.American Standard 3.5mm: Audio interface. Labo #0000 mac os.
9.MIPI DSI Interface: Connect to a display with a MIPI DSI interface(FPC 20Pin 1.0mm).
10.40 PIN GPIO Interface: Compatible with Raspberry Pi's 40-PIN.
11.AP6236: 2.4G WiFi & BT 4.2 control chip.
12.Slide Switch: Can be used to select SD card or eMMC to start.
13.Debug UART: The system default debugging serial port can enter this serial port to access the system, we'll talk more about how to do that later.
14.JST 1.0mm: 3VRTC battery interface.
15.RST Key: system reset key.
16.PWR Button: Long press about 8S to shut down, short press to boot.
17.User Button: User programmable buttons.
18.PWR LED: Development board power led.
Corposprint mac os. 19.User LED: User programmable led.
20.ACA-5036-A2-CC-S: Onboard 2.4G ceramic antenna. Superman movie free.
Multitouch 1 8 4 download free. 21.The IPEX 1 generation: External 2.4 G external antenna seat(When using an external antenna, need remove R49, R51 0Ω welding)
22. SD card slot: Is the area where a micro-sd card with the system is inserted.
23.DVP camera interface : Connect to camera with DVP interface (FPC 20Pin 1.0mm).
24.KSZ9031: 1000M Network cable drive network card.
25.STMPS2252MTR: Power switch chip.
26.MP9943: Buck DCDC Power chip.
27.WM8960: Audio codec chip.
28.MP2161: Buck DCDC Power chip.
Pin Function¶ODYSSEY - STM32MP157C's 40-pin is fully compatible with Raspberry Pi's 40PIN, including GPIO, IIC, UART, SPI, IIS and PWM pins.
Introduction To Software¶Preparatory Work¶Materials Required
ODYSSEY – STM32MP157C
Wi-Fi network
4GB (or more memory) SD card and SD card reader
PC or Mac
USB To Uart Adapter (optional)
12V/2A DC interface adapter for power supply (optional)
A USB type-c cable
Caution
Please plug the USB cable gently, otherwise you may damage the interface.Please use the USB cable with 4 wires inside, the 2 wires cable can't transfer data. If you are not sure about the wire you have, you can click here to buyMirror Installation
Like Raspberry Pi, you need to install the ODYSSEY – STM32MP157C image from your SD card to get it up and running. Super space agency mac os. We offer two ways to start ODYSSEY – STM32MP157C. You can boot from an SD card or from eMMC.
A. Boot from SD card
Step 1. Select the firmware you want to download:
Step 2. Connect an SD card to a PC or MAC with an SD card reader, an SD card with more than 4G memory is required.
Step 3.'ze Odyssey Of The Removed Keys Mac Os Download
Note
they mean to start up failed if the USER LED does not blink.Please check the boot switch whether it is SD_CARD.Step 5. After writing the image to the SD card, insert the SD card into ODYSSEY – STM32MP157C. Use USB type-c port to power the Carrier board. Do not take out the SD card during writing. ODYSSEY – STM32MP157C will boot from the SD card, you can see the PWR and USER LED lighting on SOM. Now, go to the next section: the serial console.
B. Boot from eMMC
Note
If you want to Boot from eMMC, you have to access next section: the serial console first.Step 1. the process is the same as A. Boot from SD card if you first start up the ODYSSEY – STM32MP157C.
Step 2. Edit /boot/uEnv.txt to start eMMC boot then reboot.
Step 3. Wait for the USER LED bright continuously.that indicate the eMMC boot successfully if the USER LED bright continuously.
Step 4. Power off and unplug the SD card.
Step 5. Set the slide switch to EMMC and restart.
Serial Console
Now your ODYSSEY – STM32MP157C is up, you may want to access your Linux system through the console, then set up Network, and so on. A serial port access method is provided for Linux access:
UART port - Used to debug low-level problems.(recommend)
Connect via UART port
In this section, we'll walk you through the use of the USB to TTL adapter, which connects to the ODYSSEY – STM32MP157C's Uart port(Located at the upper right of ODYSSEY – STM32MP157C), to establish a connection between your computer and ODYSSEY -STM32MP157C.
Step 1. Connect Uart port To PC/Mac using USB To TTL Adapter.If you don't have USB To TTL Adapter, click HERE to buy.（RX->TX,TX->RX）
Step 2. Using the following serial debugging tools, the baud rate is 115200:
Windows : Use PUTTY, select Serial protocol, fill in the COM port corresponding to ODYSSEY -STM32MP157C,115200 baud rate, 8 bit, no parity bits, a stop bit 1, no flow control.
Linux : Depending on the USB To TTL Adapter, should be screen /dev/ttyACM0(,1, and so on) 115200 or screen /dev/ttyUSB0(,1, and so on) 115200.
Mac : Depending on the USB To TTL Adapter, should be screen /dev/cu.usbserial1412(,1422, and so on) 115200 or screen /dev/cu.usbmodem1412(,1422, and so on) 115200.
Step 3. The default user name is debian, the password is temppwd
Step 4. If you don't have USB to TTL Adapter, you can also use Arduino. If you use Arduino, connect one end of the jumper to the Arduino's RESET pin and the other end to the Arduino's GND pin. This will bypass your Arduino's ATMEGA MCU and turn your Arduino into a USB to TTL adapter. Please refer HERE Video tutorial. Now connect the GND pin of Arduino to the GND pin of ODYSSEY -STM32MP157C's Uart port. Connect Rx pins on Arduino to Rx pins on ODYSSEY -STM32MP157C's Uart port. Connect the Tx pin on the Arduino to the Tx pin on the ODYSSEY -STM32MP157C Uart port. Finally, connect the Arduino to the PC/Mac via the Arduino's USB cable. Now check to see if your PC/Mac has found your Arduino by typing the following command:
You should get feedback like this:Now follow the steps above to connect to ODYSSEY – STM32MP157C via a serial connection. This is usually what we need to do when we first boot up, as you will then set up ODYSSEY – STM32MP157C for Wi-Fi connection and then SSH connection.Network Settings
A. Ethernet connection
You can connect to the network using an Ethernet cable. Just plug in the Ethernet cable to the Internet.Now, go to the next section: the Basic tool install.
B. Wi-Fi Settings
Note
If you want to using Wi-Fi, you have to access next section: Basic tool install first.Step 1. Check the version of Linux kernel in the current environment and install the header file of kernel version.
Step 2. Make and install driver of stm32p1 from seeed-linux-dtverlays in the GitHub.
Step 3. add dtbo package in /boot/uEnv.txt to make it become effective after reboot.
Step 4. Connect the wifi
Configure the ODYSSEY – STM32MP157C network through the network management tool connmanctl, which has been installed on the ODYSSEY -STM32MP157C image. Follow these instructions to easily complete the configuration. 
Now use the following command to find ODYSSEY – STM32MP157C's IP address. 
Basic tool install
1.SSH
SSH, short for Secure Shell, is formulated by the Network Working Group of IETF. SSH is a security protocol based on the application layer. SSH is a more reliable protocol that provides security for remote login sessions and other network services. There is no SSH protocol in the image provided by us, so we need to configure it through the serial port, so as to realize the communication between the device and the computer through SSH protocol. Enter the following command to install the SSH service in ODYSSEY -STM32MP157C.
Next, we'll use SSH to access ODYSSEY – STM32MP157C. Windows users can use third-party SSH clients. For Linux/Mac users, the SSH client is built in.
Windows users : Use PUTTY, select SSH protocol, fill in the correct IP address and click open. The user name is debian and the password is temppwd.
Linux/Mac users :
Note
If the performance experience degrades while using SSH, please switch to a more accessible WiFi network.2.GIT
Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
3.MAKE
4.WGET
Bluetooth Setting Up
Step 1. Check the version of Linux kernel in the current environment and install the header file of kernel version.
Step 2. Make and install driver of stm32p1 from seeed-linux-dtverlays in the GitHub.
Step 3. add dtbo package in /boot/uEnv.txt to make it become effective after reboot.
Activate the bluetooth
Then activate the bluetooth by the command:
Connect the bluetooth
Step 1. Scan the bluetooch by using bluetoothctl
the bluetoothctl is a tool that controls the Bluetooth to connect the other Bluetooth.
Step 2. Now using the command pair + device ID to match bluetooth device with the ODYSSEY – STM32MP157C.
Step 3. When you see the messega Pairing successful, tap connect + device ID.
If Connection successful pops up, configuration!
CANBUS Communication¶The following is the process of CANBUS communication using 2 Channel CAN BUS FD Shield for Raspberry Pi based on ODYSSEY -- STM32MP157C, first use Seeeduino V4.2 to collect the environment temperature and humidity, and then through the Seeeduino V4.2 CAN - BUS shields V2 above and the ODYSSEY – STM32MP157C Channel 2 CAN BUS FD shields above for Raspberry Pi communication.
Preparation Work¶Materials Required
ODYSSEY - STM32MP157C
Wi-Fi network
4GB (or more than 4GB) SD card and SD card reader
PC or Mac
USB To Uart Adapter(optional)
12V/2ADC interface adapter for power supply (optional)
A USB type-c cable
Two double-male dupont lines
Hardware Connection
Step 1. According to the installation guide insert 2 Channel CAN BUS FD Shield for Raspberry Pi onto ODYSSEY - STM32MP157C.
Step 2. Insert CAN BUS Shield V2 into Seeeduino V4.2.
Step 3. Connect Channel CAN BUS FD Shield for Raspberry Pi to can-bus Shield V2 using jumper wire.
2 Channel CAN BUS FD Shield for Raspberry PiCAN-BUS Shield V2
CAN_0_LCANL
CAN_0_HCANH
Step 4. Power ODYSSEY STM32MP157C and Seeeduino V4.2
Dependency installation
Step 1. Install the environment for python.
- Step 2. Install git.Step 3. Install the make related environment.
software installation¶Install CAN-HAT and LCD drivers
Step 1. Check the version of Linux kernel in the current environment and install the header file of kernel version.
Step 2. Make and install driver of stm32p1 from seeed-linux-dtverlays in the GitHub.
Step 3. add dtbo package in /boot/uEnv.txt to make it become effective after reboot.
Step 4. Check the driver whether install successfully by using dmesg, you will view the below information if it is successful.
Config CAN-HAT and LCD
Step 1. Configure can-bus
Step 2. Configure the lcd environment
Run the Demo¶Run the following code on 'ODYSSEY - STM32MP157C'
Run CanBus_SendForArduino.ino on Seeeduino V4.2.
Play with GPIO¶This part will introduce how to use grove.py to control GPIO and Grove Socket on ODYSSEY STM32MP157C.there exists two way to connect with the Grove Socket in this board. the one hand is using the Digital Grove Interface and IIC Grove Interface, the other is using ODYSSEY - STM32MP157C's 40-pin. The description of the PIN defines for the ODYSSEY - STM32MP157C's 40-pin please refer to Pin Function.It is convenient for you to use this ODYSSEY - STM32MP157C's 40-pin.So,Let's go.

Item	Values
Peripheral Interface	2 x USB Host 1 x gigabit Ethernet interface 1 x 3.5mm audio interface 1 x MIPI DSI display interface 1 x DVP camera interface 2 x Grove (GPIO & I2C) 1 x SD card interface (on the back of the board)
WiFi/Bluetooth	WiFi 802.11 b/g/n 2.4GHz Bluetooth 4.1
On-board LED	1 x reset LED 3 x user-defined LED 1 x power LED
Power	1 x DC interface (12V/2A power input is recommended) 1 x USB Type - C
Button	1 x reset button 1 x user button 1 x dial code key
dimension	56mm x 85mm
Operating temperature	0 ~ 75 ℃

2 Channel CAN BUS FD Shield for Raspberry Pi	CAN-BUS Shield V2
CAN_0_L	CANL
CAN_0_H	CANH

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'ze Odyssey Of The Removed Keys Mac Os 7Set to the gpio mode¶Step 1. Check the version of Linux kernel in the current environment and install the header file of kernel version.
Step 2. Make and install driver of stm32p1 from seeed-linux-dtverlays in the GitHub.
Step 3. add dtbo package in /boot/uEnv.txt to make it become effective after reboot.
Step 4. Install the environment for python3.
Digital output on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove - BuzzerGrove Base Hat for Raspberry Pi
Get ONE NowGet ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect the Grove Buzzer to D5 port of the Base Hat.
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
Note
we will hear sound from the buzzer if everything has been well.Digital Input on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove - ButtonGrove Base Hat for Raspberry Pi
Get ONE NowGet ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect the Grove Button to D5 port of the Base Hat.
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
Note
we will view some information at the terminal if the button has been pressed.ADC on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove - Temperature SensorGrove Base Hat for RasPi
Get ONE NowGet ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect the temperature sensor to port A0 of the Base Hat.
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
Note
we will view temperature data at the terminal if everything has been well.UART on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove Base Hat for RasPi
Get ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect RX To TX in Basehat using jumper
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
if we connect the TX to RX we will get hello seeder at terminal.and the location of TX and RX we can view Pin Function.
I2S on ODYSSEY-STM32MP157C¶In this section, we will explain the control principle of the Linux I2S programming. Now we will use I2S and ReSpeaker 2-Mics Pi HAT to tell you how to use it.
Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CReSpeaker 2-Mics Pi HAT
Get ONE NowGet ONE Now
Step 2. According to the installation hardware guide insert ReSpeaker 2-Mics Pi HAT onto ODYSSEY – STM32MP157C.
Software¶Step 1. Install alsa-utils by using apt
Step 2. Go to the dtbs file location and download the stm32mp1 dtb file.
Note: You can also download the stm32mp1 .dtb file here
Step 3. Config the uEnv.txt as following:
Change the dtb settings to
Step 4. reboot
Step 5. Go into the seeed-linux-dtverleys folder and configure soundstate as follow：
Step 6. Check the driver whether install successfully by using aplay and arecord, you will view the below information if it is successful.
Step 7. Now you can start playing with ReSpeaker 2-Mics Pi Hat! For simple record and play testing, run the following command:
To record an audio to test.wav:
To play the test.wav audio. Remember to plug in a headphone or speaker to output the audio.
https://gangsoft.mystrikingly.com/blog/the-legend-of-the-two-birds-mac-os. Note
if you cannot get any sound maybe you can reboot again.For more information about the ReSpeaker 2-Mics Pi HAT you can visit wiki
Resourses¶'ze Odyssey Of The Removed Keys Mac Os X[PDF]STM32MP157C Datasheet
[SCH]Seeed SoM - STM32MP157C
[SCH]ODYSSEY-STM32MP157C
[3Dfile]ODYSSEY-STM32MP157C
[OrCAD]ODYSSEY-STM32MP157C
[OrCAD]Seeed SoM - STM32MP157C
[PDF]ODYSSEY-STM32MP157C 2d file
[PDF]STM32 Reference Guide
[URL]Advanced system development
Tech Support¶Please submit any technical issue into our forum. 

ODYSSEY – STM32MP157C	Grove - Buzzer	Grove Base Hat for Raspberry Pi
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ODYSSEY – STM32MP157C	Grove - Button	Grove Base Hat for Raspberry Pi
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ODYSSEY – STM32MP157C	Grove - Temperature Sensor	Grove Base Hat for RasPi
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ODYSSEY – STM32MP157C	Grove Base Hat for RasPi
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ODYSSEY – STM32MP157C	ReSpeaker 2-Mics Pi HAT
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'ze Odyssey Of The Removed Keys Mac Os 7Set to the gpio mode¶Step 1. Check the version of Linux kernel in the current environment and install the header file of kernel version.
Step 2. Make and install driver of stm32p1 from seeed-linux-dtverlays in the GitHub.
Step 3. add dtbo package in /boot/uEnv.txt to make it become effective after reboot.
Step 4. Install the environment for python3.
Digital output on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove - BuzzerGrove Base Hat for Raspberry Pi
Get ONE NowGet ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect the Grove Buzzer to D5 port of the Base Hat.
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
Note
we will hear sound from the buzzer if everything has been well.Digital Input on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove - ButtonGrove Base Hat for Raspberry Pi
Get ONE NowGet ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect the Grove Button to D5 port of the Base Hat.
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
Note
we will view some information at the terminal if the button has been pressed.ADC on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove - Temperature SensorGrove Base Hat for RasPi
Get ONE NowGet ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect the temperature sensor to port A0 of the Base Hat.
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
Note
we will view temperature data at the terminal if everything has been well.UART on Basehat by using Grove.py¶Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CGrove Base Hat for RasPi
Get ONE NowGet ONE Now
Step 2. Plug the Grove Base Hat into ODYSSEY - STM32MP157C.
Step 3. Connect RX To TX in Basehat using jumper
Step 4. Connect the ODYSSEY - STM32MP157C to PC through USB cable.
Software¶Step 1. Install the Grove.py
Step 2. Download the source file by cloning the grove.py library.
Step 3. Excute below command to run the code.
if we connect the TX to RX we will get hello seeder at terminal.and the location of TX and RX we can view Pin Function.
I2S on ODYSSEY-STM32MP157C¶In this section, we will explain the control principle of the Linux I2S programming. Now we will use I2S and ReSpeaker 2-Mics Pi HAT to tell you how to use it.
Hardware¶Step 1. Things used in this project:
ODYSSEY – STM32MP157CReSpeaker 2-Mics Pi HAT
Get ONE NowGet ONE Now
Step 2. According to the installation hardware guide insert ReSpeaker 2-Mics Pi HAT onto ODYSSEY – STM32MP157C.
Software¶Step 1. Install alsa-utils by using apt
Step 2. Go to the dtbs file location and download the stm32mp1 dtb file.
Note: You can also download the stm32mp1 .dtb file here
Step 3. Config the uEnv.txt as following:
Change the dtb settings to
Step 4. reboot
Step 5. Go into the seeed-linux-dtverleys folder and configure soundstate as follow：
Step 6. Check the driver whether install successfully by using aplay and arecord, you will view the below information if it is successful.
Step 7. Now you can start playing with ReSpeaker 2-Mics Pi Hat! For simple record and play testing, run the following command:
To record an audio to test.wav:
To play the test.wav audio. Remember to plug in a headphone or speaker to output the audio.
https://gangsoft.mystrikingly.com/blog/the-legend-of-the-two-birds-mac-os. Note
if you cannot get any sound maybe you can reboot again.For more information about the ReSpeaker 2-Mics Pi HAT you can visit wiki
Resourses¶'ze Odyssey Of The Removed Keys Mac Os X[PDF]STM32MP157C Datasheet
[SCH]Seeed SoM - STM32MP157C
[SCH]ODYSSEY-STM32MP157C
[3Dfile]ODYSSEY-STM32MP157C
[OrCAD]ODYSSEY-STM32MP157C
[OrCAD]Seeed SoM - STM32MP157C
[PDF]ODYSSEY-STM32MP157C 2d file
[PDF]STM32 Reference Guide
[URL]Advanced system development
Tech Support¶Please submit any technical issue into our forum. 
Automatic Reference Counting (ARC) is a memory management feature of the Clangcompiler providing automatic reference counting for the Objective-C and Swiftprogramming languages. At compile time, it inserts into the object codemessagesretain and release[1][2] which increase and decrease the reference count at run time, marking for deallocation those objects when the number of references to them reaches zero.
'ze Odyssey Of The Removed Keys Mac Os CatalinaARC differs from tracing garbage collection in that there is no background process that deallocates the objects asynchronously at runtime.[3] Unlike tracing garbage collection, ARC does not handle reference cycles automatically. This means that as long as there are 'strong' references to an object, it will not be deallocated. Strong cross-references can accordingly create deadlocks and memory leaks. It is up to the developer to break cycles by using weak references.[4]
Apple Inc. deploys ARC in their operating systems, such as macOS (OS X) and iOS. Limited support (ARCLite)[5] has been available since Mac OS X Snow Leopard and iOS 4, with complete support following in Mac OS XLion and iOS 5.[6] Garbage collection was declared deprecated in OS X Mountain Lion, in favor of ARC, and removed from the Objective-C runtime library in macOS Sierra.[7][8]
Objective-C[edit]The following rules are enforced by the compiler when ARC is turned on:
retain, release, retainCount, autorelease or dealloc cannot be sent to objects. Instead, the compiler inserts these messages at compile time automatically, including [super dealloc] when dealloc is overridden.[9]
Programs cannot cast directly between id and void *.[9] This includes casting between Foundation objects and Core Foundation objects. Programs must use special casts, or calls to special functions, to tell the compiler more information about an object's lifetime.
An autorelease pool can be used to allocate objects temporarily and retain them in memory until the pool is 'drained'. Without ARC, an NSAutoreleasePool object can be created for this purpose. ARC uses @autoreleasepool blocks instead, which encapsulate the allocation of the temporary objects and deallocates them when the end of the block is reached.[9]
Programs cannot call the functions NSAllocateObject and NSDeallocateObject[9]
Programs cannot use object pointers in C structures (structs)[9]
Programs cannot use memory zones (NSZone)[9]
To properly cooperate with non-ARC code, programs must use no method or declared property (unless explicitly choosing a different getter) that starts with new.[9]
Property declarations[edit]ARC introduces some new property declaration attributes, some of which replace the old attributes.
Without ARCWith ARCWith ARCLite [Note 1]
retainstrong
assign (for object types)weakunsafe_unretained
copy
^ARCLite is ARC but without zeroing weak references (used when deploying to a less-capable operating environment than ARC requires).
Zeroing weak references[edit]Zeroing weak references is a feature in Objective-C ARC that automatically clears (sets to nil) weak-reference local variables, instance variables, and declared properties immediately before the object being pointed to starts deallocating. This ensures that the pointer goes to either a valid object or nil, and avoids dangling pointers. Prior to the introduction of this feature, 'weak references' referred to references that were not retaining, but were not set to nil when the object they pointed to was deallocated (equivalent to unsafe_unretained in ARC), thus possibly leading to a dangling pointer. The programmer typically had to ensure that all possible weak references to an object were set to nil manually when it was being deallocated. Zeroing weak references obviates the need to do this.
Zeroing weak references are indicated by using the declared property attributeweak or by using the variable attribute __weak.
Zeroing weak references are only available in Mac OS X Lion (10.7) or later and iOS 5 or later, because they require additional support from the Objective-C runtime. However, some OS X classes do not currently support weak references.[9] Code that uses ARC but needs to support versions of the OS older than those above cannot use zeroing weak references, and therefore must use unsafe_unretained weak references. There exists a third-party library called PLWeakCompatibility [1] that allows one to use zeroing weak references even on these older OS versions.
Converting to[edit]Xcode 4.2 or later provides a way to convert code to ARC.[10] As of Xcode 4.5, it is found by choosing Edit > Refactor > Convert to Objective-C ARC. Although Xcode will automatically convert most code, some code may have to be converted manually. Xcode will inform the developer when more complex use cases arise, such as when a variable is declared inside an autorelease pool and used outside it or when two objects need to be toll-free bridged with special casts.
Swift[edit]In Swift, references to objects are strong, unless they are declared weak or unowned. Swift requires explicit handling of nil with the Optional type: a value type that can either have a value or be nil. An Optional type must be handled by 'unwrapping' it with a conditional statement, allowing safe usage of the value, if present. Conversely, any non-Optional type will always have a value and cannot be nil.
Accordingly, a strong reference to an object cannot be of type Optional, as the object will be kept in the heap until the reference itself is deallocated. A weak reference is of type Optional, as the object can be deallocated and the reference be set to nil. Unowned references fall in-between; they are neither strong nor of type Optional. Instead, the compiler assumes that the object to which an unowned reference points is not deallocated as long the reference itself remains allocated. This is typically used in situations where the target object itself holds a reference to the object that holds the unowned reference.
Swift also differs from Objective-C in its usage and encouragement of value types instead of reference types. Most types in the Swift standard library are value types and they are copied by value, whereas classes and closures are reference types and passed by reference. Because value types are copied when passed around, they are deallocated automatically with the reference that created them.[11]
See also[edit]References[edit]^Siracusa, John (July 20, 2011). 'Mac OS X 10.7 Lion: the Ars Technica review'. Ars Technica. Ars Technica. At section 'Automatic Reference Counting'. Retrieved November 17, 2016.CS1 maint: discouraged parameter (link)
^Kochan, Stephen G. (2011). Programming in Objective-C (4th ed.). Boston, Mass.: Addison-Wesley. pp. 408. ISBN978-0321811905.
^Hoffman, Kevin (2012). Sams teach yourself Mac OS X Lion app development in 24 hours. Indianapolis, Ind.: Sams. pp. 73. ISBN9780672335815.
^'General'. Automatic Reference Counting. LLVM.org. Retrieved 15 August 2012.CS1 maint: discouraged parameter (link)
^'Objective-C Feature Availability Index'. Apple, Inc. Retrieved 2013-10-14.CS1 maint: discouraged parameter (link)
^Sakamoto, Kazuki (2012). Pro Multithreading and Memory Management for iOS and OS X with ARC, Grand Central Dispatch and Blocks. Apress. pp. xii. ISBN978-1430241164.
^Siracusa, John (July 25, 2012). 'OS X 10.8 Mountain Lion: the Ars Technica review'. Ars Technica. At section 'Objective-C enhancements'. Retrieved November 17, 2016.
^'Xcode 8 Release Notes'. Apple Developer. October 27, 2016. Archived from the original on March 19, 2017. Retrieved March 19, 2017.
^ abcdefgh'Transitioning to ARC Release Notes'. Retrieved 14 September 2012.CS1 maint: discouraged parameter (link)
^'What's New in Xcode 4.2 – Automatic Reference Counting'. Apple Inc. Archived from the original on 20 August 2012. Retrieved 3 October 2012.CS1 maint: discouraged parameter (link)
^'Value and Reference Types'. Apple Developer. August 15, 2014. Retrieved November 17, 2016.
External links[edit]'Automatic Reference Counting' in The Swift Programming Language
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Automatic_Reference_Counting&oldid=971382203'

Without ARC	With ARC	With ARCLite ^{[Note 1]}
`retain`	`strong`
`assign` (for object types)	`weak`	`unsafe_unretained`
`copy`