How to work with twi event handler?

[Andreas]

Hi,

At the moment I try to communicate with an external EEPROM. Writing to the EEPROM seems to work. But when reading back the written data, the program breaks... :-(

Is the twi event handler called for every byte, I want to read? Or is the twi event handler called, when the complete data read for example 20byte is done?

Please find attached my complete eeprom read/write implementation (including twi_init and event handler). Maybe someone can have a look on it.

The programm is running on nRF51822 - AC, with the SDK8.1.0.

m24512.c

Regards, BTprogrammer

[Susheel Nuguru]

You will get an event for every nrf_drv_twi_tx and nrf_drv_twi_rx function called. That is full transfer, not for every byte.

The way you call __WFE is not good, it might result in your chip sleeping for ever.

Please replace below with your __WFE();

// Make sure any pending events are cleared
__SEV();
__WFE();
// Enter System ON sleep mode
__WFE();