disabling twi/i2c

Question

Hey, I am using twi_hw_master.c and twi_master.h libraries for twi and want to disable i2c to save power when not in use. I use the following two lines to disable the i2c:

NRF_TWI1->ENABLE       = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; 

NRF_TWI1->POWER        = 0;

but it still works. What other steps do I need to take in order to disable the twi peripheral? I'm using nrf51822 on a custom board with sdk9.0. Thanks, Vandita

Code files: main.c latch_i2c.c

bjorn-spockeli · Accepted Answer

You'll have to set the following registers: NRF_TWI1->TASKS_STOP = 1; NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; NRF_TWI1->INTENCLR = (TWI_INTENCLR_STOPPED_Disabled << TWI_INTENCLR_STOPPED_Pos)| \ (TWI_INTENCLR_RXDREADY_Disabled << TWI_INTENCLR_RXDREADY_Pos)| \ (TWI_INTENCLR_TXDSENT_Disabled << TWI_INTENCLR_TXDSENT_Pos)| \ (TWI_INTENCLR_ERROR_Disabled << TWI_INTENCLR_ERROR_Pos)| \ (TWI_INTENCLR_BB_Disabled << TWI_INTENCLR_BB_Pos);