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ESP32 Tutorial Partition Mapping

Howto map Partitions from SPI-Flash to Memory

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First create a data partition and load binary data into it. Then you can access the partition via a pointer on Array very quickly, at least 3 times faster than SPIFF.

First change Partition Tables in Arduino:

Folder: C:\Users\XXXXX\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\tools\partitions

Create a New File, as Example "Storage.csv":

# Name,Type,SubType,Offset,Size,Flags
nvs,data,nvs,0x9000,0x5000,
otadata,data,ota,0xe000,0x2000,
app0,app,ota_0,0x10000,0x140000,
eeprom,data,0x99,0x150000,0x1000,
storage,data,0x99,0x151000,0x200000,
spiffs,data,spiffs,0x351000,0xaf000,

0,

Change board.txt for your Board:

Folder: C:\Users\XXXXX\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\

lolin32.menu.PartitionScheme.default=Default
lolin32.menu.PartitionScheme.default.build.partitions=default
lolin32.menu.PartitionScheme.no_ota=No OTA (Large APP)
lolin32.menu.PartitionScheme.no_ota.build.partitions=no_ota
lolin32.menu.PartitionScheme.no_ota.upload.maximum_size=2097152
lolin32.menu.PartitionScheme.min_spiffs=Minimal SPIFFS (Large APPS with OTA)
lolin32.menu.PartitionScheme.min_spiffs.build.partitions=min_spiffs
lolin32.menu.PartitionScheme.min_spiffs.upload.maximum_size=1966080
-->lolin32.menu.PartitionScheme.custom=Custom Storage
-->lolin32.menu.PartitionScheme.custom.build.partitions=storage
-->lolin32.menu.PartitionScheme.custom.upload.maximum_size=1966080

Make a Test Sketch and Upload it to reconfigure Partitions and check storage Partitioning in Board Menu before.

Now you can upload a Image with esp32 Flash Tool from here:

https://www.espressif.com/en/support/download/other-tools

Example Sketch:

const esp_partition_t* part;
spi_flash_mmap_handle_t handle;
void* data;
esp_err_t err;

void setup() {
part = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, "storage");
esp_partition_find(ESP_PARTITION_TYPE_DATA,ESP_PARTITION_SUBTYPE_ANY, "storage");
err = esp_partition_mmap(part, 0, part->size, SPI_FLASH_MMAP_DATA, (const void**)&data, &handle);
  
if (err != ESP_OK)
  {
    printf("esp_partition_mmap failed. (%d)\n", err);
    //delay(10000);
    abort();
  }
//Example for Display data without overhead:
 vspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
digitalWrite(5, LOW); //pull SS slow to prep other end for transfer
unsigned long offset=0;
vspi->writeBytes((uint8_t*)data + offset, width*height * 3);
digitalWrite(5, HIGH); //pull ss high 
}
}

void loop(){
}

  • 1
    ESP32 Partition Mapping, Create a new Partition CSV-File

    First change Partition Tables in Arduino:

    Folder: C:\Users\XXXXX\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\tools\partitions

    Create a New File, as Example "Storage.csv":

    # Name,Type,SubType,Offset,Size,Flags
    nvs,data,nvs,0x9000,0x5000,
    otadata,data,ota,0xe000,0x2000,
    app0,app,ota_0,0x10000,0x140000,
    eeprom,data,0x99,0x150000,0x1000,
    storage,data,0x99,0x151000,0x200000,
    spiffs,data,spiffs,0x351000,0xaf000,
  • 2
    Changes in board.txt

    Change board.txt for your Board:

    Folder: C:\Users\XXXXX\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\

    lolin32.menu.PartitionScheme.default=Default
    lolin32.menu.PartitionScheme.default.build.partitions=default
    lolin32.menu.PartitionScheme.no_ota=No OTA (Large APP)
    lolin32.menu.PartitionScheme.no_ota.build.partitions=no_ota
    lolin32.menu.PartitionScheme.no_ota.upload.maximum_size=2097152
    lolin32.menu.PartitionScheme.min_spiffs=Minimal SPIFFS (Large APPS with OTA)
    lolin32.menu.PartitionScheme.min_spiffs.build.partitions=min_spiffs
    lolin32.menu.PartitionScheme.min_spiffs.upload.maximum_size=1966080
    -->lolin32.menu.PartitionScheme.custom=Custom Storage
    -->lolin32.menu.PartitionScheme.custom.build.partitions=storage
    -->lolin32.menu.PartitionScheme.custom.upload.maximum_size=1966080
  • 3
    Choose in Board-Menu your Board and Partition Options "Storage"

    Now you can upload a Binary Image with esp32 Flash Tool from here:

    https://www.espressif.com/en/support/download/other-tools

View all 4 instructions

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