disabling twi/i2c

RE: disabling twi/i2c

Vandita — Fri, 22 Jan 2016 23:54:57 GMT

This works to disable the i2c. Though the transfer function enables i2c if it is not enabled already which made it seem like i2c wasn't getting disabled. Issue was resolved.

RE: disabling twi/i2c

Vandita — Tue, 22 Dec 2015 17:10:09 GMT

I'm using twi_hw_master.c

RE: disabling twi/i2c

bjorn-spockeli — Fri, 18 Dec 2015 10:12:36 GMT

Are you using twi_hw_master.c or twi_sw_master.c?

RE: disabling twi/i2c

Vandita — Thu, 17 Dec 2015 15:04:21 GMT

Hey Bjorn, I tried these statements and still the i2c is working. I have added the code files to the question.

RE: disabling twi/i2c

bjorn-spockeli — Thu, 17 Dec 2015 10:42:38 GMT

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);

RE: disabling twi/i2c

Vandita — Wed, 16 Dec 2015 14:04:38 GMT

Hey Bjorn, Thanks for your response. I had earlier tried to use the nrf_drv_twi libraries but faced a lot of issues and moved to the incubated libraries instead. The nrf_drv_twi function takes a TWI instance as an argument and that's not available as I'm using the other libraries.

What other registers need to be written for disabling the TWI? Thanks, Vandita

RE: disabling twi/i2c

bjorn-spockeli — Wed, 16 Dec 2015 11:35:57 GMT

The drivers located in the incubated folder are decrepated. Use the nrf_drv_twi_disable function in the nrf_drv_twi driver, please refer the TWI Driver Documentation, found here.