The FLASH driver can be swapped out depending on the needs of the keyboard, or whether extra hardware is present.
| Driver | Description |
|---|---|
FLASH_DRIVER = spi |
Supports writing to almost all NOR Flash chips. See the driver section below. |
Currently QMK supports almost all NOR Flash chips over SPI. As such, requires a working spi_master driver configuration. You can override the driver configuration via your config.h:
config.h override |
Description | Default Value |
|---|---|---|
#define EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN |
SPI Slave select pin in order to inform that the FLASH is currently being addressed | none |
#define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR |
Clock divisor used to divide the peripheral clock to derive the SPI frequency | 8 |
#define EXTERNAL_FLASH_PAGE_SIZE |
The Page size of the FLASH in bytes, as specified in the datasheet | 256 |
#define EXTERNAL_FLASH_SECTOR_SIZE |
The sector size of the FLASH in bytes, as specified in the datasheet | (4 * 1024) |
#define EXTERNAL_FLASH_BLOCK_SIZE |
The block size of the FLASH in bytes, as specified in the datasheet | (64 * 1024) |
#define EXTERNAL_FLASH_SIZE |
The total size of the FLASH in bytes, as specified in the datasheet | (512 * 1024) |
#define EXTERNAL_FLASH_ADDRESS_SIZE |
The Flash address size in bytes, as specified in datasheet | 3 |
!> All the above default configurations are based on MX25L4006E NOR Flash.