LPC43xx dual core procedure

Document created by jorge_plascencia Employee on Apr 25, 2016Last modified by jorge_plascencia Employee on Apr 27, 2016
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Build procedures

Open the M0 and M4 projects by clocking on the uvproj files. Make sure the 'iram' version of the project is selected in the target seleciton window. Select the Build target item from the Project menu to build the images. Build the M0 version of the project first, as the M0 binary is used for the M4 version. The FLASH version of the project works the same way as the IRAM version, but runs out of FLASH while using IRAM for RW data. When building the FLASH version, make sure both the M0 and M4 binaries are built using the FLASH configuration. Build the M0 version first, and then the M4 version. The BOOT1 to BOOT4 jumpers on the Hitex board should be setup as BOOT1-1-2, BOOT2-2-3, BOOT3-2-3, and BOOT4-1-2.

Opened M0 project shown below



Opened M4 project shown below


Start the debug session

Connect the Keil ULink2 JTAG debugger to the Hitex LPC4350 board's 10-pin JTAG connector. Power up the board by plugging in a 5.0v supply into the power plug (X14).

On my board, the boot configuration was set as follows: BOOT1-1-2, BOOT2-2-3, BOOT3-2-3, BOOT4-2-3. Make sure the JTAG is setup correctly for dual-core debugging.

In the M4 project window, select the Start/stop Debug Session item from the debug menu to load the image into the board. The image should load and run until the main() function.


At this point, you can select run from the debug menu to start the M4 core. The M4 core will initialize the system and board and boot the M0 core. Both the M0 and M4 core will be running FreeRTOS and the red, blue, and green LEDs will start blinking.

Let the M4 core run for a few seconds and then select stop from the debug menu. The red LED will stop blinking (indicating the M4 core is stopped), while the blue and green LEDs will continue blinking. After a short time, the green LED will quit blinking and only the blue LED will blink. The green LED is controlled by the shared memory queue the M4 core populates. When the M4 core was stopped, the filling of the queue on the M4 side was stopped, so the M0 core continued processing what was left in the queue until it ran out on entries.

Restart the M4 core and both the red and green LEDs will start blinking again. Stop the M4 core and wait until the green LED stops blinking. Leave the M4 core stopped and switch to the M0 project. Select Start/stop Debug Session item from the debug menu to connect to the running process. The M0 core will stop once you do this. Make absolutely sure that the debug options for loading the image into memory or altering system configuration via the linker init file are dsiabled, as we don't want to reload and restart the process that was kicked off from the M4 core.

At this point, both the M0 and M4 debug sessions are halted. You can start and stop or single step via each session independently! Select run from the M0 or M4 sessions' debug menu to restart only that core. Depending on which core you've started, the red or blue LED (and possibly green for the M0 core if the queue has data) will start blinking.

You can view the state of shared memory queue in real-time by opening a memory window and typing in the address 0x10080000. You'll see the M4 and M0 indexes incrementing.