VAR-SOM-MX7 FreeRTOS for M4 PingPong demo
Prerequisites
Before you begin, ensure to read Complete Developers Guide and follow sections 2,3 and 4.
Build the demo
cd ~/var-som-mx7_m4-freertos/freertos-variscite/examples/var-som-mx7_m4 cd demo_apps/rpmsg/pingpong_freertos cd armgcc export ARMGCC_DIR=~/var-som-mx7_m4-freertos/gcc-arm-none-eabi-5_4-2016q3 ./build_all.sh > /dev/null
Copy the demo binary to the BOOT (FAT32) partition of the bootable SD card:
cp release/rpmsg_pingpong_freertos_example.bin /media/BOOT
Gracefully eject the SD card from your host machine, and plug it in the EVK.
Connect UART2 using pins J5.5 (RX) and J5.7 (TX) and configure the connection on your host PC as 115200 8N1 for the Cortex-M4 debug UART.
Connect a micro-USB cable to the DEBUG port and configure the connection on your host PC as 115200 8N1 for the regular (Cortex-A7) debug UART.
Power on the board and hit any key on the Cortex-A7 terminal to stop autoboot and get to the U-Boot command line.
Setup and save the U-Boot environment:
setenv use_m4 yes setenv fdtfile undefined setenv m4bootdata 0x007F8000 setenv m4image rpmsg_pingpong_freertos_example.bin saveenv
Start Cortex-M4 demo
run m4boot
After the boot process succeeds, the Cortex-M4 terminal displays the following information:
RPMSG PingPong FreeRTOS RTOS API Demo... RPMSG Init as Remote
Start Cortex-A7 core
run bootcmd
Then login from Yocto console and load the pingpong module:
modprobe imx_rpmsg_pingpong
After the Linux ping-pong master side module is installed, the Cortex-M4 terminal displays something like:
Name service handshake is done, M4 has setup a rpmsg channel [1 ---> 1024] Get Data From Master Side: 0 Get Data From Master Side: 11 Get Data From Master Side: 22 Get Data From Master Side: 33 Get Data From Master Side: 44 ...
A video of the demo starting on our target is available here: