Flash as EEPROM and what is the maximum size of memory configuration/supports

[Venkatesh P]

Hi Team,

    We need to use Flash as EEPROM and we have the following queries,

1. How much maximum size of Flash can be configured/emulated as EEPROM/NVM?

2. Whether below pins should be shorted as described below to access flash memory as emulated EEPROM?
Master [ 3- TWI_SCL_M,4- TWI_SDA _M]   Slave pins [ 31-EEPROM_SIM_SCL_S,30-EEPROM_SIM_SDA_S ]

Thanks,

Venkatesh

[JONATHAN LL]

Hi Venkatesh,

The documentation for TWI slave master shows where the the example is, in the config.h that you find in <InstallFolder>\examples\peripheral\twi_master_with_twis_slave you can see that the pin config. 

```

#define EEPROM_SIM_SCL_S         31   //!< Slave SCL pin.

#define EEPROM_SIM_SDA_S         30   //!< Slave SDA pin.
```

 
```

/* Master Configuration */

#define MASTER_TWI_INST     0       //!< TWI interface used as a master accessing EEPROM memory.

#define UART_TX_BUF_SIZE    1024    //!< UART TX buffer size.

#define UART_RX_BUF_SIZE    32      //!< UART RX buffer size.

#define TWI_SCL_M           3       //!< Master SCL pin.

#define TWI_SDA_M           4       //!< Master SDA pin.

#define IN_LINE_PRINT_CNT   (16u)   //!< Number of data bytes printed in a single line.
``` 

Master [ 3- TWI_SCL_M,4- TWI_SDA _M]   Slave pins [ 31-EEPROM_SIM_SCL_S,30-EEPROM_SIM_SDA_S ]

This will be correct yes.

 I dont have a max amount number but there is 256kB RAM on the nrf52840 so keep it below that. How much storage do you need?

 Regards,
Jonathan