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

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

Siva — Wed, 12 Oct 2016 10:32:59 GMT

Thanks it's Working.

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

Jørgen Holmefjord — Wed, 12 Oct 2016 07:49:51 GMT

The reason that you are getting these errors are because you have defined m_twi_master instance on line 170 in you main file with the argument MASTER_TWI_INST. This is not defined anywhere. You should use a number corresponding to the TWI instance you are using and have enabled in nrf_drv_config.h.

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

Siva — Tue, 11 Oct 2016 15:23:20 GMT

I have now uploaded my project "EX_1.rar".

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

Jørgen Holmefjord — Tue, 11 Oct 2016 14:33:20 GMT

None of this is defined in "../../components/drivers_nrf/twi_master/nrf_drv_twi.h":

NRF_TWIMASTER_TWI_INST
NRF_TWIMASTER_TWI_INST
TWIMASTER_TWI_INST_INSTANCE_INDEX
TWI_MASTER_TWI_INST_USE_EASY_DMA

Can you upload the project where you use TWI master driver?

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

Siva — Tue, 11 Oct 2016 14:22:57 GMT

I am using SDK v11.0.0

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

Jørgen Holmefjord — Tue, 11 Oct 2016 14:21:24 GMT

Which SDK version are you using?

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

Siva — Tue, 11 Oct 2016 13:52:23 GMT

Those errors are coming from "../../components/drivers_nrf/twi_master/nrf_drv_twi.h". I am not sure if it to do with declaration or something else.

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

Jørgen Holmefjord — Tue, 11 Oct 2016 13:41:38 GMT

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?

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

Siva — Tue, 11 Oct 2016 13:09:05 GMT

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;

NRF_TWIMASTER_TWI_INST
NRF_TWIMASTER_TWI_INST 3.TWIMASTER_TWI_INST_INSTANCE_INDEX
TWI_MASTER_TWI_INST_USE_EASY_DMA

Any suggestion?

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

Jørgen Holmefjord — Tue, 11 Oct 2016 11:04:43 GMT

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.

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

Siva — Tue, 11 Oct 2016 09:30:44 GMT

Hi,

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

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

Jørgen Holmefjord — Tue, 11 Oct 2016 09:23:27 GMT

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.