Hi All,
I have a problem where I cannot seem to wake up my NRF52832 with a GPIO. I am first attempting this on my NRF52DK with an interrupt form an accelerometer.
I have put an excerpt of my code below, I hope it helps. I have cut out a lot of superfluous code relating to SAADC, TWI, LED OUTPUTS etc so I have omitted it, but I have believe that these are not part of the problem.
I have also tried to accomplish this with GPIOTE driver with no luck so I have put it back to basics for low power sake and gone to PORT method to sleep. I seem to be able to put it to sleep but nothing wakes it up.
There is code in my program to communicate to the accelerometer to reset the interrupt and that component is working fine (I used my logic analyser to verify) and I see that the input is correct (normally high, looking for a low signal to wake).
The GPIOTE_IRQHandler does run as expected before sd_app_evt_wait() is called and should trigger system to send data to my accelerometer (see attached logic screenshots), but as soon as the system sleeps (ON mode) it stops working. I have turned off all breakpoints as there is a FaultHandler issue when using a SoftDevice so I can't really debug this any further.
Need assistance!
#include "defines.h"
#include "nrf_drv_config.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "main.h"
#include "nrf.h"
#include "nrf_soc.h"
#include "nrf_gpio.h"
#include "nrf_drv_timer.h"
const nrf_drv_timer_t TIMER_SLEEP = NRF_DRV_TIMER_INSTANCE(0);
unsigned short system_state_machine; // Our system state machine
/******************************************************************************************
POWER CONTROL FUNCTIONS
- shutdown peripherals
******************************************************************************************/
void init_LowPower() {
NRF_POWER->DCDCEN = 1;
NRF_POWER->SYSTEMOFF = 0;
}
void enter_sleep() {
nrf_drv_timer_disable(&TIMER_SLEEP);
sd_app_evt_wait();
}
/******************************************************************************************
TIMER FUNCTIONS
- Handler
- initialisation
- timer reset
******************************************************************************************/
void sleep_timer_event_handler(nrf_timer_event_t event_type, void* p_context) {
system_state_machine = SYSTEM_SLEEP; // change to sleep mode
enter_sleep();
}
void init_timer() {
ret_code_t err_code;
err_code = nrf_drv_timer_init(&TIMER_SLEEP, NULL, sleep_timer_event_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&TIMER_SLEEP,NRF_TIMER_CC_CHANNEL0,nrf_drv_timer_ms_to_ticks(&TIMER_SLEEP, TIME_TO_SLEEP_MS),NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,true);
nrf_drv_timer_enable(&TIMER_SLEEP);
}
/******************************************************************************************
GPIO/GPIOTE FUNCTIONS
- initialisation for interrupts
- Handler
******************************************************************************************/
void init_gpio_interrupts() {
NRF_GPIOTE->INTENCLR = GPIOTE_INTENSET_PORT_Msk;
nrf_gpio_cfg_sense_input(PIN_ACCELEROMETER_INTA, GPIO_PIN_CNF_PULL_Pullup, GPIO_PIN_CNF_SENSE_Low);
NRF_GPIOTE->EVENTS_PORT = 1;
NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_PORT_Msk;
NVIC_SetPriority(GPIOTE_IRQn, APP_IRQ_PRIORITY_LOW); //optional: set priority of interrupt
NVIC_EnableIRQ(GPIOTE_IRQn);
}
void GPIOTE_IRQHandler(void) {
ret_code_t err_code;
if (system_state_machine == SYSTEM_SLEEP) wake_from_sleep();
system_state_machine = SYSTEM_WAKE; // change to wake mode
NRF_GPIOTE->EVENTS_PORT = 0;
nrf_gpio_pin_toggle(PIN_LED1);
nrf_drv_timer_clear(&TIMER_SLEEP);
}
void main(void) {
init_gpio_interrupts(); // Init Accelerometer Interrupts
init_LowPower(); // Init Low power mode
init_timer(); // Init timeout timer
nrf_drv_timer_clear(&TIMER_SLEEP);
}
