Chapter 2. API Reference
A strategy to select the maximum allowed speed is to enumerate from the ESP_FLSH_SPEED_MAX-1 or
highest frequency supported by your flash, and decrease the speed until the probing success.
Values:
ESP_FLASH_5MHZ = 0
The flash runs under 5MHz.
ESP_FLASH_10MHZ
The flash runs under 10MHz.
ESP_FLASH_20MHZ
The flash runs under 20MHz.
ESP_FLASH_26MHZ
The flash runs under 26MHz.
ESP_FLASH_40MHZ
The flash runs under 40MHz.
ESP_FLASH_80MHZ
The flash runs under 80MHz.
ESP_FLASH_120MHZ
The flash runs under 120MHz, 120MHZ can only be used by main flash after timing tuning in system.
Do not use this directely in any API.
ESP_FLASH_SPEED_MAX
The maximum frequency supported by the host is ESP_FLASH_SPEED_MAX-1.
enum esp_flash_io_mode_t
Mode used for reading from SPI flash.
Values:
SPI_FLASH_SLOWRD = 0
Data read using single I/O, some limits on speed.
SPI_FLASH_FASTRD
Data read using single I/O, no limit on speed.
SPI_FLASH_DOUT
Data read using dual I/O.
SPI_FLASH_DIO
Both address & data transferred using dual I/O.
SPI_FLASH_QOUT
Data read using quad I/O.
SPI_FLASH_QIO
Both address & data transferred using quad I/O.
SPI_FLASH_OPI_STR = SPI_FLASH_OPI_FLAG
Only support on OPI flash, flash read and write under STR mode.
SPI_FLASH_OPI_DTR
Only support on OPI flash, flash read and write under DTR mode.
SPI_FLASH_READ_MODE_MAX
The fastest io mode supported by the host is ESP_FLASH_READ_MODE_MAX-1.
API Reference - Partition Table
Header File
• components/spi_flash/include/esp_partition.h
Espressif Systems 756
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