mailbox_mutex#
Overview#
The mailbox_mutex example shows how to use mailbox mutex.
In this example: The core 0 sends address of shared variable to core 1 by mailbox. Both cores trying to get mutex in while loop, after that updates shared variable and sets mutex, to allow access other core to shared variable.
Supported Boards#
FRDM-MCXN947
Hardware requirements
Type-C USB cable
FRDM-MCXN947 board
Personal Computer
Board settings
No special settings are required.
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a type-c USB cable between the PC host and the MCU-Link USB port (J17) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
The log below shows example output of the Mailbox mutex example in the terminal window:
Mailbox mutex example
Copy CORE1 image to address: 0x2004e000, size: 6940
Core1 has mailbox mutex, update shared variable to: 1
Core0 has mailbox mutex, update shared variable to: 2
Core1 has mailbox mutex, update shared variable to: 3
Core0 has mailbox mutex, update shared variable to: 4
Core1 has mailbox mutex, update shared variable to: 5
.
.
.
Note: The “Copy CORE1 image to address…” log message is not displayed on the terminal window when MCUXpresso IDE is used. In case of MCUXpresso IDE the secondary core image is copied to the target memory during startup automatically.
FRDM-MCXN947T
Hardware requirements
Type-C USB cable
FRDM-MCXN947T board
Personal Computer
Board settings
No special settings are required.
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a type-c USB cable between the PC host and the MCU-Link USB port (J17) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
The log below shows example output of the Mailbox mutex example in the terminal window:
Mailbox mutex example
Copy CORE1 image to address: 0x2004e000, size: 6940
Core1 has mailbox mutex, update shared variable to: 1
Core0 has mailbox mutex, update shared variable to: 2
Core1 has mailbox mutex, update shared variable to: 3
Core0 has mailbox mutex, update shared variable to: 4
Core1 has mailbox mutex, update shared variable to: 5
.
.
.
Note: The “Copy CORE1 image to address…” log message is not displayed on the terminal window when MCUXpresso IDE is used. In case of MCUXpresso IDE the secondary core image is copied to the target memory during startup automatically.
LPCXpresso55S69
Hardware requirements
Mini/micro USB cable
LPCXpresso55s69 board
Personal Computer
Board settings
No special settings are required.
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (P6) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
The log below shows example output of the Mailbox mutex example in the terminal window:
Mailbox mutex example
Copy CORE1 image to address: 0x20033000, size: 3556
Core1 has mailbox mutex, update shared variable to: 1
Core0 has mailbox mutex, update shared variable to: 2
Core1 has mailbox mutex, update shared variable to: 3
Core0 has mailbox mutex, update shared variable to: 4
Core1 has mailbox mutex, update shared variable to: 5
.
.
.
Note: The “Copy CORE1 image to address…” log message is not displayed on the terminal window when MCUXpresso IDE is used. In case of MCUXpresso IDE the secondary core image is copied to the target memory during startup automatically.
MCX-N5XX-EVK
Hardware requirements
Mini/micro USB cable
MCX-N5XX-EVK board
Personal Computer
Board settings
No special settings are required.
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the PC host and the MCU-Link USB port (J5) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
The log below shows example output of the Mailbox mutex example in the terminal window:
Mailbox mutex example
Copy CORE1 image to address: 0x2004e000, size: 6940
Core1 has mailbox mutex, update shared variable to: 1
Core0 has mailbox mutex, update shared variable to: 2
Core1 has mailbox mutex, update shared variable to: 3
Core0 has mailbox mutex, update shared variable to: 4
Core1 has mailbox mutex, update shared variable to: 5
.
.
.
Note: The “Copy CORE1 image to address…” log message is not displayed on the terminal window when MCUXpresso IDE is used. In case of MCUXpresso IDE the secondary core image is copied to the target memory during startup automatically.
MCX-N9XX-EVK
Hardware requirements
Mini/micro USB cable
MCX-N9XX-EVK board
Personal Computer
Board settings
No special settings are required.
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the PC host and the MCU-Link USB port (J5) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
The log below shows example output of the Mailbox mutex example in the terminal window:
Mailbox mutex example
Copy CORE1 image to address: 0x2004e000, size: 6940
Core1 has mailbox mutex, update shared variable to: 1
Core0 has mailbox mutex, update shared variable to: 2
Core1 has mailbox mutex, update shared variable to: 3
Core0 has mailbox mutex, update shared variable to: 4
Core1 has mailbox mutex, update shared variable to: 5
.
.
.
Note: The “Copy CORE1 image to address…” log message is not displayed on the terminal window when MCUXpresso IDE is used. In case of MCUXpresso IDE the secondary core image is copied to the target memory during startup automatically.