ESP-IDF Adv. - Assign. 4.1 · Developer Portal

Table of Contents

Change partition table to Factory app, two ota definitions (guided)

WS00B - This article is part of a series.

Part 1: ESP-IDF Workshop: Advanced

Part 2: ESP-IDF Adv. - Lecture 1

Part 3: ESP-IDF Adv. - Assign. 1.1

Part 4: ESP-IDF Adv. - Assign. 1.2

Part 5: ESP-IDF Adv. - Assign. 1.3

Part 6: ESP-IDF Adv. - Lecture 2

Part 7: ESP-IDF Adv. - Assign. 2.1

Part 8: ESP-IDF Adv. - Assign. 2.2

Part 9: ESP-IDF Adv. - Assign. 4.2

Part 9: ESP-IDF Adv. - Lecture 3

Part 10: ESP-IDF Adv. - Assign. 3.1

Part 11: ESP-IDF Adv. - Assign. 3.2

Part 12: ESP-IDF Adv. - Assign. 3.3

Part 13: ESP-IDF Adv. - Lecture 4

Part 15: This Article

Part 16: ESP-IDF Adv. - Assign. 4.3

To perform OTA, we need a partition table with at least two partitions.

Assignment steps
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Check the current partition table
Change it to a different default partition table
Check the new partition table

Check the current partition table
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To check the current partition table loaded in your module, you need to:

Read the flash and dump the partition table in a .bin file
Convert the .bin file to a readable format

Read the flash
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To read the flash, use 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).

This creates a partition_table.bin file.

Convert the partition table
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Inside a terminal, use gen_esp32part.py.

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

You should get this output:

Parsing binary partition input...
Verifying table...
# ESP-IDF Partition Table
# Name, Type, SubType, Offset, Size, Flags
nvs,data,nvs,0x9000,24K,
phy_init,data,phy,0xf000,4K,
factory,app,factory,0x10000,1M,
coredump,data,coredump,0x110000,64K,

Change partition table
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Now we change the partition table, using the most appropriate default option selectable via menuconfig.

Open menuconfig: > ESP-IDF: SDK Configuration Editor (menuconfig)
→ Partition Table → Factory app, two OTA definitions

Since we’re now using two OTAs, the default flash configuration of 2MB is not enough, so we need to change it too

Open menuconfig: > ESP-IDF: SDK Configuration Editor (menuconfig)
→ Serial Flasher Config → Flash Size → 4MB

Check the new partition table
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Let’s do the same steps as before:

esptool.py -p <YOUR-PORT> read_flash 0x8000 0x1000 partition_table.bin
python $IDF_PATH/components/partition_table/gen_esp32part.py partition_table.bin

And you’ll get

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,factory,0x10000,1M,
ota_0,app,ota_0,0x110000,1M,
ota_1,app,ota_1,0x210000,1M,

Conclusion
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In this assignment you changed the partition table from Single factory app, no ota to the default Factory app, two ota definitions. Both of these partition table scheme are provided as default values from ESP-IDF. In the next assignment you will create a custom partition table.