# Partitions
## Partition table
A file called **partitions.csv** is located in the root of the esp-idf project folder. With content similar to:
```
# Name,   Type,  SubType, Offset,   Size, Flags
nvs,      data,  nvs,     0x9000,   0x4000,
otadata,  data,  ota,     0xd000,   0x2000,
phy_init, data,  phy,     0xf000,   0x1000,
ota_0,    app,   ota_0,   0x10000,  0x120000,
ota_1,    app,   ota_1,   0x130000, 0x120000,
config,   data,  phy,     0x250000, 0x4000,
logging,  data,  phy,     0x254000, 0x145000,
```
## Updating a partition table
### Switch to custom partitions
You must tell ESP-IDF to stop using the default layout and look at your new CSV file instead. In **idf.py menuconfig** navigate to Partition Table.Change Partition Table Type from "Single factory app" to Custom partition CSV file. Ensure the Custom partition CSV filename setting is set to partitions.csv. Press S to save and Q to quit.
### Build partition table
Edit the contents of the partitions.csv file and run the following commands:
```
idf.py menuconfig
idf.py partition-table
idf.py build
```
### Write Partition Table to ESP32
Flash the partition table by:
```
idf.py -p /dev/ttyUSB0 partition-table-flash
```
Or you can do a full flash which will also write the table.
```
idf.py -p /dev/ttyUSB0 flash
```
### Read Partition Table from ESP32
Read the Partition Table Flashed on a Connected ESP32If you want to pull the partition table off a physical ESP32 board to see what is currently flashed on it, you can use the target partition-table-dump.
```
idf.py -p [PORT] partition-table-dump
```
It invokes esptool.py in the background to read the binary partition data directly from the chip's flash memory (always located at offset 0x8000 or 0x9000 depending on your SDK configuration) and prints the structure to your terminal.  
## Erase a partition area
```
esptool --port /dev/ttyUSB0 erase_region 0x254000 0x145000
```
## Full Flash
```
idf.py -p /dev/ttyACM0 flash
python -m esptool --chip esp32c3 -p /dev/ttyACM0 -b 460800 --before default-reset --after hard-reset write-flash --flash-mode dio --flash-size 4MB --flash-freq 80m 0x0 build/bootloader/bootloader.bin 0x8000 build/partition_table/partition-table.bin 0xd000 build/ota_data_initial.bin 0x10000 build/LCR-Meter.bin 0x250000 default.config
```
### Write Application to partition
```
python -m esptool --chip esp32c3 -p /dev/ttyACM0 -b 460800 --before default_reset --after hard-reset write_flash --flash-mode dio --flash-size 4MB --flash-freq 80m 0x10000 build/ESR-Meter.bin
```
### Read from partition
```
esptool --port /dev/ttyACM0  write-flash --flash-mode qio  0x250000 default.config
```
### Write Config to partition 
```
esptool --port /dev/ttyACM0  write-flash --flash-mode qio  0x250000 default.config
```
###  Read CONFIG from partition
```
esptool --port /dev/ttyACM0 -b 460800 --before default-reset --chip esp32c3  read-flash 0x250000 4096 downloaded.config
```