| .. _ipm_esp32: |
| |
| ESP32 Soft-IPM example |
| ###################### |
| |
| Overview |
| ******** |
| This simple example can be used with multicore ESP32 Soc, and demonstrates |
| the software intercore messaging mechanism to be used in AMP applications. |
| |
| ESP32 has two CPU named APP and PRO, in this simple example PRO send a |
| message to the APP using the IPM driver, and waits for the APP response |
| message and prints its contents on console. |
| |
| ESP32 intercore messaging has up two four channels, the 0 and 1 are |
| reserved for BT and WIFI messages, and channels 2 and 3 is free to |
| any application, each channel supports up to 64 bytes of data per |
| message, so high level protocol is responsible to fragment larger |
| messages in chunks of 64bytes. |
| |
| Building and Running the Zephyr Code |
| ************************************ |
| |
| The sample requires two build commands to run, first of all |
| you need to build the esp32_net firmware as follows: |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/drivers/ipm/ipm_esp32/ipm_esp32_net |
| :board: esp32_net |
| :goals: build |
| :compact: |
| |
| Copy output file build/zephyr/esp32_net_firmware.c to samples/drivers/ipm/ipm_esp32/src, |
| then build the main project and flash as stated earlier, and you would see the following output: |
| |
| .. code-block:: console |
| |
| *** Booting Zephyr OS build zephyr-v3.0.0-1911-g610f489c861e *** |
| PRO_CPU is sending a fake request, waiting remote response... |
| PRO_CPU received a message from APP_CPU : APP_CPU: This is a response |
| PRO_CPU is sending a fake request, waiting remote response... |
| PRO_CPU received a message from APP_CPU : APP_CPU: This is a response |
| PRO_CPU is sending a fake request, waiting remote response... |
| PRO_CPU received a message from APP_CPU : APP_CPU: This is a response |
| PRO_CPU is sending a fake request, waiting remote response... |
| PRO_CPU received a message from APP_CPU : APP_CPU: This is a response |
| PRO_CPU is sending a fake request, waiting remote response... |
| PRO_CPU received a message from APP_CPU : APP_CPU: This is a response |
| PRO_CPU is sending a fake request, waiting remote response... |
| PRO_CPU received a message from APP_CPU : APP_CPU: This is a response |
| PRO_CPU is sending a fake request, waiting remote response... |
| PRO_CPU received a message from APP_CPU : APP_CPU: This is a response |
