ESP32 custom flash partitions

[dparkinson]

How can I set up custom flash partitions for an ESP32 MSBuild project?

Specifically, I want some partitions reserved for some data (Type = data, SubType = nvs?). I’d give it a unique name so I know what it’s used for in my program when I call the

esp_partition_find_first(
ESP_PARTITION_TYPE_DATA,
ESP_PARTITION_SUBTYPE_DATA_NVS,
“my_data”);

Do I need to run the esp-idf tool to first generate a partitions.bin file before creating a new project? (see http://esp-idf.readthedocs.io/en/latest/api-guides/partition-tables.html and  partition_table/gen_esp32part.py).

 

[support]

Hi,

Yes, please run the esp-idf tool, generate a new partitions.bin file and specify a path to it on the first page of VisualGDB Project Properties.

[dparkinson]

Thanks! I was able to get something that seems to work.

It seems I had to make a custom partition type in the range 0x40-0xFE. Otherwise, if I make it general NVS data, the WiFi will try to store wifi configuration data in that space. (I was using your WiFi server example/tutorial as the starting point for the project).  The subtype then has to be O (instead of nvs) or the gen_esp32part.py doesn’t like it.

I left the other partitions alone so hopefully the WiFi portion will continue to work, correctly. (It seems to be working so far).

# Name, Type, SubType, Offset, Size, Flags
factory, app, factory, 0x010000, 1M,
rfdata, data, phy, 0x110000, 0x40000,
wifidata, data, nvs, 0x150000, 0x40000,

--------------- App Partitions-----------
--- App Partition 1 ---
pPartition->type 0
pPartition->subtype 0
pPartition->address 0x00010000
pPartition->size 0x00100000
pPartition->label factory
pPartition->encrypt 0
--------------- Data Partitions-----------
--- Data Partition 1 ---
pPartition->type 1
pPartition->subtype 2
pPartition->address 0x00150000
pPartition->size 0x00040000
pPartition->label wifidata
pPartition->encrypt 0

--- Data Partition 2 ---
pPartition->type 1
pPartition->subtype 1
pPartition->address 0x00110000
pPartition->size 0x00040000
pPartition->label rfdata
pPartition->encrypt 0

So, my new partition.csv table looked something like this

# Name, Type, SubType, Offset, Size, Flags
# Note: if you change the phy_init or app partition offset, make sure to change the offset in Kconfig.projbuild
factory, app, factory, 0x010000, 1M,
rfdata, data, phy, 0x110000, 0x40000,
wifidata, data, nvs, 0x150000, 0x40000,
my_data, 0x40, 0, 0x190000, 0x10000

[support]

Hi,

Thanks for sharing this, good to know that it works.

[Author]

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