TWI Low power mode

RE: TWI Low power mode

Murugan — Thu, 02 Aug 2018 07:32:04 GMT

Problem solved. I am just add few lines in power manage function "static void power_manage(void) " . Anyway thank you @haakonsh.

static void power_manage(void)
{
#if (__FPU_USED == 1)
__set_FPSCR(__get_FPSCR() & ~(0x0000009F));
(void) __get_FPSCR();
NVIC_ClearPendingIRQ(FPU_IRQn);
#endif
__WFE();

uint32_t err_code = sd_app_evt_wait();
APP_ERROR_CHECK(err_code);
}

RE: TWI Low power mode

Murugan — Thu, 02 Aug 2018 04:46:35 GMT

When i need battery value i call this function . That time only take 5 ma Current. After few seconds going to 50uA.

void Read_Battery_Volt(void){
uint32_t err_code;
adc_configure();nrf_delay_ms(10);
err_code = nrf_drv_saadc_sample();
APP_ERROR_CHECK(err_code);nrf_delay_ms(10);
err_code = nrf_drv_saadc_sample();
APP_ERROR_CHECK(err_code);nrf_delay_ms(10);
err_code = nrf_drv_saadc_sample();
APP_ERROR_CHECK(err_code);nrf_delay_ms(10);
nrf_drv_saadc_uninit();
}

RE: TWI Low power mode

haakonsh — Wed, 01 Aug 2018 10:47:51 GMT

Do you mind sharing the configuration of the SAADC driver?
Are you putting the CPU to sleep whenever you're not using it?

RE: TWI Low power mode

Murugan — Wed, 01 Aug 2018 07:04:35 GMT

Thanks for reply. My ADC part also take 5ma but it is going to disabled and consume low current. But i cant disable the TWI module.

RE: TWI Low power mode

haakonsh — Tue, 31 Jul 2018 12:49:17 GMT

you need to take care when using the drivers in blocking mode as the nrf_delay_ms() functions are implemented as asm NOP instructions and it will therefore not put the CPU to sleep. If you want to sleep while waiting you need to set up an RTC to time out after the given timout period and put the CPU to sleep with the following calls:
__WFE();

__SEV();

__WFE();.