nrf52 TWI excess current consumption

RE: nrf52 TWI excess current consumption

???? — Sat, 06 Apr 2019 09:13:35 GMT

I got the same issue as you, did you solve it at the end?

RE: nrf52 TWI excess current consumption

Dajgoro Labinac — Sun, 02 Jul 2017 16:49:06 GMT

Thats a bit different form what I have form the example, where do you get the &m_twi_master? Here is what I have:

void twi_init(void)
{
nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
nrf_drv_twi_enable(&m_twi);
}

And then I before each i2c operation i have functions to stop and start twi: EDIT:

I got it working, here are the modifications:

void twi_start(void)
{
	nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
	nrf_drv_twi_enable(&m_twi);
}

void twi_stop()
{
	nrf_drv_twi_uninit(&m_twi);
	*(volatile uint32_t *)0x40003FFC = 0;
	*(volatile uint32_t *)0x40003FFC;
	*(volatile uint32_t *)0x40003FFC = 1;
}

RE: nrf52 TWI excess current consumption

cedric — Sun, 02 Jul 2017 16:40:13 GMT

Here is what i've done :

twi_master_init();
	i2cTxBuffer[0]=REG_CTRL1;
	i2cTxBuffer[1]=0x4F;// 50Hz, Low power mode
	i2cTxBuffer[2]=0xC4;
	i2cTxBuffer[3]=0x80;
	i2cTxBuffer[4]=0x10;
	i2cTxBuffer[5]=0x08;
	i2cTxBuffer[6]=0x00;
	nrf_drv_twi_tx(&m_twi_master,ADDRESS,(uint8_t*)i2cTxBuffer,7,true);
	twi_master_uninit();
	twi_master_init();
	i2cTxBuffer[0]=REG_CTRL2;
	i2cTxBuffer[1]=0x4E;
	i2cTxBuffer[2]=0xdd;
	i2cTxBuffer[3]=0x88;
	i2cTxBuffer[4]=0x11;
	i2cTxBuffer[5]=0x12;
	i2cTxBuffer[6]=0x00;
	nrf_drv_twi_tx(&m_twi_master,ADDRESS_I2C_ADD,(uint8_t*)i2cTxBuffer,7,true);
	twi_master_uninit();

as you can see, I init transmit and then uninit. That's strange, but it works...

RE: nrf52 TWI excess current consumption

Dajgoro Labinac — Sun, 02 Jul 2017 16:25:10 GMT

I'm having the same issue with twi busy when attempting reconfiguration.

RE: nrf52 TWI excess current consumption

Paul Dunn — Thu, 16 Feb 2017 22:47:27 GMT

I'm still having the same trouble I described above. Can you confirm you think this solutions works when running a soft device? (I am using SD 332.) If I do a 'sd_app_evt_wait();' after the above, then a 'nrf_drv_twi_enable', I get error code 17 when I next try to use the TWI. Can you be more clear on what "Reconfiguration of TWI is required before next usage." (from errata 89) means.

RE: nrf52 TWI excess current consumption

Paul Dunn — Sat, 12 Nov 2016 21:05:36 GMT

Aryan - I get an error code 17 (busy). I initialize using nrf_drv_twi_init and nrf_drv_enable, then when I want to sleep I issue nrf_drv_twi_disable prior to the two instruction in Errata 89 (using the volatile keyword, as the current does not reduce without it, presumably because the compiler optimizes out the instructions), then when I wake up I nrf_drv_twi_enable, but get error 17 when I try to use the TWI.

RE: nrf52 TWI excess current consumption

Susheel Nuguru — Fri, 11 Nov 2016 11:10:52 GMT

but both return error codes

What error codes do you get and for which API?

RE: nrf52 TWI excess current consumption

Paul Dunn — Thu, 10 Nov 2016 23:25:53 GMT

I tried the above as well, and it does indeed solve the problem of excess current with the TWI disabled. However, once I've issued these instructions, I cannot get the TWI to work again. Errata 89 says "Reconfiguration of TWI is required before next usage". I tried re-initializing (nrf_drv_twi_init) and just re-enabling, but both return error codes, and the TWI does not work afterwards. I'm using SDK 11. Can you provide more details on what it takes to "reconfigure the TWI". The errata also mentions "Turn the TWI off and back on after it has been disabled". I assume that means to issue a nrf_drv_twi_disable prior to the above instructions; which is what I tried. Maybe provide a complete sequence of instructions to disable, then re-enable.

RE: nrf52 TWI excess current consumption

cedric — Thu, 25 Aug 2016 15:20:32 GMT

ok that works. I thought I4ve tried this errata workaround in all the tries I've made, but it actually works.

RE: nrf52 TWI excess current consumption

Susheel Nuguru — Thu, 25 Aug 2016 12:32:11 GMT

I should have been able to solve this case earlier but I missed to see one errata. Errata 89 tells that this is an anomaly inside the chip. And the work around is given. Just add below code when you want to disable TWI

For TWI0 for number 89 anomaly on nRF52

*(uint32_t *)(0x40003000 + 0xFFC ) = 0;
*(uint32_t *)(0x40003000 + 0xFFC ) = 1;

For TWI1 for number 89 anomaly on nRF52

*(uint32_t *)(0x40004000 + 0xFFC ) = 0;
*(uint32_t *)(0x40004000 + 0xFFC ) = 1;

I tested this personally and it works.

RE: nrf52 TWI excess current consumption

Susheel Nuguru — Thu, 25 Aug 2016 11:11:23 GMT

please attach your project.

RE: nrf52 TWI excess current consumption

cedric — Thu, 25 Aug 2016 11:09:35 GMT

n52832-QFAAB0-1610A1

RE: nrf52 TWI excess current consumption

Susheel Nuguru — Thu, 25 Aug 2016 11:03:38 GMT

I am not able to reproduce it in nRF52DK, Can you please attach your project and tell me exactly which version of nRF52 you are using. Give me the laser markings on the chip that says NRF52822XXXXXX, where X changes with chip versions

RE: nrf52 TWI excess current consumption

Susheel Nuguru — Thu, 25 Aug 2016 07:29:17 GMT

sorry, missed this post , i will check you code now and report you back soon

RE: nrf52 TWI excess current consumption

cedric — Wed, 24 Aug 2016 16:59:48 GMT

does someone has a solution? Is the chip bugged?

RE: nrf52 TWI excess current consumption

cedric — Tue, 23 Aug 2016 08:26:49 GMT

nrf52 0.9.2, the softdevice is S132

RE: nrf52 TWI excess current consumption

Susheel Nuguru — Tue, 23 Aug 2016 07:56:28 GMT

strange .... which sdk did you use? i can try it out and see on PCA10040 DK