ESP-IDF C5 - Assign. 2.2

In this assignment, you’ll set a custom partition table using VS Code.

Assignment steps

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1. Enable the custom partition table in menuconfig.
2. Add a spiffs partition using the partition table editor.
3. Build and flash the new partition table.
4. Read the partition table again to confirm the change.

Enable the custom partition table in menuconfig

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1. Open menuconfig: > ESP-IDF: SDK Configuration Editor (menuconfig)

2. Go to Partition Table → Custom Partition Table CSV.

   This tells ESP-IDF to build the project’s partition table from a CSV file that you edit yourself, instead of one of the built-in schemes.

Add a spiffs partition using the partition table editor

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1. Open the editor: > ESP-IDF: Open Partition Table Editor UI
2. Copy the partition table from Assignment 2.1 as your starting point.
3. Add a spiffs partition after the existing entries.

Build and flash the new partition table

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1. Build the partition table: > ESP-IDF: Build Partition Table
2. Flash the partition table: > ESP-IDF: Flash (UART) Your Project

Read the partition table again to confirm the change

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Read the partition table back from flash, as you did in Assignment 2.1, to confirm the new spiffs partition was written correctly.

1. Read the flash and dump the partition table into a .bin file using esptool.py:

   esptool.py -p <YOUR-PORT> read_flash 0x8000 0x1000 partition_table.bin

   <YOUR-PORT> is the same port you use to flash the device (e.g. /dev/tty.usbmodem1131101 or COM25).

2. Convert the partition_table.bin file to a readable format using gen_esp32part.py:

   python $IDF_PATH/components/partition_table/gen_esp32part.py partition_table.bin

   You get this output:

   Parsing binary partition input...
   Verifying table...
   # ESP-IDF Partition Table
   # Name, Type, SubType, Offset, Size, Flags
   nvs,data,nvs,0x9000,16K,
   otadata,data,ota,0xd000,8K,
   phy_init,data,phy,0xf000,4K,
   factory_app,app,factory,0x10000,1M,
   ota_0,app,ota_0,0x110000,1M,
   ota_1,app,ota_1,0x210000,1M,
   fs,data,spiffs,0x310000,64K,

   The table now includes the fs partition, confirming that the custom partition table with the spiffs filesystem was flashed successfully.

Conclusion

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In this assignment, you built a custom partition table CSV based on the OTA scheme from the previous assignment and added a spiffs partition for a filesystem. You then built, flashed, and verified the new partition table. With the partition table in place, you’re ready to move on to OTA updates.

Next step

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Next step → Lecture 3

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