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eeprom_i2c driver: added EXTERNAL_EEPROM_WP_PIN configuration option. (#12617)

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Purdea Andrei 2021-06-22 05:34:28 +03:00 • committed by GitHub
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docs/eeprom_driver.md
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@ -31,6 +31,9 @@ Currently QMK supports 24xx-series chips over I2C. As such, requires a working i
`#define EXTERNAL_EEPROM_PAGE_SIZE` | Page size of the EEPROM in bytes, as specified in the datasheet | 32
`#define EXTERNAL_EEPROM_ADDRESS_SIZE` | The number of bytes to transmit for the memory location within the EEPROM | 2
`#define EXTERNAL_EEPROM_WRITE_TIME` | Write cycle time of the EEPROM, as specified in the datasheet | 5
`#define EXTERNAL_EEPROM_WP_PIN` | If defined the WP pin will be toggled appropriately when writing to the EEPROM. | _none_
Some I2C EEPROM manufacturers explicitly recommend against hardcoding the WP pin to ground. This is in order to protect the eeprom memory content during power-up/power-down/brown-out conditions at low voltage where the eeprom is still operational, but the i2c master output might be unpredictable. If a WP pin is configured, then having an external pull-up on the WP pin is recommended.
Default values and extended descriptions can be found in `drivers/eeprom/eeprom_i2c.h`.