Dear All ,
I am a little stumped.... Basically first i was working with the beacon app on sdk 12 on the 51822 chip. Now I have moved to the 52382 chip.
I modified the app to run with my requirements. I added a timer to fire at every 5 seconds to check the input pin. and set advertising intervals to 10 seconds. I was getting really good current consumption of 8ua when broadcasting. and 2ua when sleeping.
But then I moved to sdk 16 and 52382 chip, only added a TWI I2c , connected to a mp121 capacitive touch sensor. All was going well until I started checking the final step of current consumption. The consumption was hitting 6ma when using the TWI(meaning sending and reading data).. which seems obsurd.... I disabled nrf Log but did not help at all. When the chip goes in a system power of mode the consumption is still hitting 70ua.
I read somewhere that the TWI' Consumption is not that high only around .5ma max when running.(I am hitting 6ma also when i just read one register)
Here is my code for twi init.
/**
* @brief UART initialization.
*/
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_mp121_config = {
.scl = 19,
.sda = 4,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, twi_handler, NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&m_twi);
}
My repeated timer which is triggered every 5 seconds:-
/**@brief Timeout handler for the repeated timer.
*/
static void repeated_timer_handler(void * p_context)
{
nrf_gpio_cfg_input(3,NRF_GPIO_PIN_PULLUP);
nrf_gpio_cfg_sense_input(3,NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);
//readRegister8(MPR121_E0BV);
// readRegister16(MPR121_TOUCHSTATUS_L);
if(m_sample==1)//(nrf_gpio_pin_read(3)==0)
{
NRF_LOG_INFO("Button Pressed.");
advertising_stop();
advertising_init(1,0);
advertising_start();
nrf_gpio_cfg_default(23);
DelCounter=0;
}
else
{
DelCounter=DelCounter+1;
NRF_LOG_INFO("DelCounter %d.",DelCounter);
if(DelCounter>9)
{
sd_power_system_off();
}
}
}
My main:-
*/
int main(void)
{
// Initialize.
uint32_t err_code;
log_init();
NRF_LOG_INFO("Beacon example started.");
NRF_LOG_FLUSH();
timers_init();
twi_init();
MP121_set_mode();
NRF_LOG_FLUSH();
//leds_init();
create_timers();
err_code = app_timer_start(m_repeated_timer_id, APP_TIMER_TICKS(5000), NULL);
APP_ERROR_CHECK(err_code);
power_management_init();
ble_stack_init();
//sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);
advertising_init(0,0);
// nrf_gpio_cfg_input(3,BUTTON_PULL);
//nrf_gpio_cfg_sense_input(3, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);
// APP_ERROR_CHECK(err_code);
// Start execution.
advertising_start();
// Enter main loop.
// Enter main loop.
for (;; )
{
// power_manage();
idle_state_handle();
}
}
Powe Functions:-
/**@brief Function for handling the idle state (main loop).
*
* @details If there is no pending log operation, then sleep until next the next event occurs.
*/
static void idle_state_handle(void)
{
if (NRF_LOG_PROCESS() == false)
{
nrf_pwr_mgmt_run();
}
}
/**@brief Function for doing power management.
*/
static void power_manage(void)
{
uint32_t err_code = sd_app_evt_wait();
APP_ERROR_CHECK(err_code);
}
