External EEPROM via I2C (Non-constant address declaration issue)

[Siva]

Hi,

EX_1.rar

Can I define "non-const" variable for writing data via I2C using "APP_TWI_Write" function? Similar for read.

When using External "EEPROM" one should define register address and data to be stored as a dynamic variable rather than const.

When I try to use macros, compiler says "error: initializer element is not constant".

Is it possible to communicate with EEPROM via I2C using "TWI transaction Manager"?

Any advice on this would be great.

Regards

Siva

[Jørgen Holmefjord]

Can you please upload the code? Which EEPROM are you using? Typically you send the address as TWI payload, which should not have to be const.

[Siva]

Hi,

I am using "24AA128(Microchip EEPROM)". I have now attached my code where I used macros.

[Jørgen Holmefjord]

Please have a look at the TWIS Slave and TWI Master mode drivers Example in the SDK. In this example a EEPROM TWI slave device is emulated and the master reads and writes to the device using the TWI master driver.

[Siva]

Is this the ideal way to do if I want to access both EEPROM and Capactive sensor? I have already developed my code for Capactive sensor using "TWI transaction Manager".

I am getting "undeclared error" messages while using TWI master driver on the following functions;

1. NRF_TWIMASTER_TWI_INST
2. NRF_TWIMASTER_TWI_INST 3.TWIMASTER_TWI_INST_INSTANCE_INDEX
3. TWI_MASTER_TWI_INST_USE_EASY_DMA

Any suggestion?

[Jørgen Holmefjord]

Please checout this post about the differences between app_twi and nrf_drv_twi. Which one you should use depends primarily on you preferences. app_twi is built on top of nrf_drv_twi, so they can basically perform the same operations. I cannot find the functions you are refering, can you explain where these functions are from?