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diff --git a/docs/flash_driver.md b/docs/flash_driver.md new file mode 100644 index 0000000000..fa7fed5171 --- /dev/null +++ b/docs/flash_driver.md @@ -0,0 +1,24 @@ +# FLASH Driver Configuration :id=flash-driver-configuration + +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. + + +## SPI FLASH Driver Configuration :id=spi-flash-driver-configuration + +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. |