Hi，
I want to measure the time of two signals to calculate the speed and sent the data with BLE. I find the SD effect the GPIOTE_interrupt sometimes, when I try to use GPIOTE and timer to calcluate the time . So I use the PPI function, connect the NRF_GPIOTE->EVENTS_IN[ ] to the NRF_TIMER2->TASKS. But the program can not boot up with PPI and GPIOTE_interrupt and SD. I debugged the program. Looks it go to the "System Reset".
If I use PPI and GPIOTE interrupt without BLE SD, it works well. I can measure the time accurately. If I use PPI with SD and disable the interrupt, it works well. If I use the GPIOTE interrupt with SD and disable the PPI, it works well too.
void time1_init(void)
{
NRF_TIMER2->MODE = TIMER_MODE_MODE_Timer;
NRF_TIMER2->PRESCALER = 4;
NRF_TIMER2->CC[2] = (50000U);
NRF_TIMER2->INTENSET = TIMER_INTENSET_COMPARE2_Enabled << TIMER_INTENSET_COMPARE2_Pos;
NRF_TIMER2->SHORTS = (TIMER_SHORTS_COMPARE2_CLEAR_Enabled << TIMER_SHORTS_COMPARE2_CLEAR_Pos);
NVIC_ClearPendingIRQ(TIMER2_IRQn);
NVIC_SetPriority(TIMER2_IRQn,3);
NVIC_EnableIRQ(TIMER2_IRQn);
// NRF_TIMER2->TASKS_START = 1;
}
void ppi_init(void)
{
// Configure PPI channel 0 to start Timer 2
NRF_PPI->CH[0].EEP = (uint32_t)(&NRF_GPIOTE->EVENTS_IN[0]);
NRF_PPI->CH[0].TEP = (uint32_t)(&NRF_TIMER2->TASKS_START);
// Configure PPI channel 1 to capture Timer2
NRF_PPI->CH[1].EEP = (uint32_t)(&NRF_GPIOTE->EVENTS_IN[1]);
NRF_PPI->CH[1].TEP = (uint32_t)(&NRF_TIMER2->TASKS_CAPTURE[0]);
// Enable only PPI channels 0 and 1.
NRF_PPI->CHEN = (PPI_CHEN_CH0_Enabled << PPI_CHEN_CH0_Pos) | (PPI_CHEN_CH1_Enabled << PPI_CHEN_CH1_Pos);
}
void EXIT_KEYS_Init(void)
{
nrf_gpio_cfg_input(S1,GPIO_PIN_CNF_PULL_Pullup);
nrf_gpio_cfg_input(S2,GPIO_PIN_CNF_PULL_Pullup);
// NVIC_SetPriority(GPIOTE_IRQn,1);
NRF_GPIOTE->CONFIG[0] = (GPIOTE_CONFIG_POLARITY_HiToLo << GPIOTE_CONFIG_POLARITY_Pos)
| (S1 << GPIOTE_CONFIG_PSEL_Pos)
| (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos);
NRF_GPIOTE->CONFIG[1] = (GPIOTE_CONFIG_POLARITY_HiToLo << GPIOTE_CONFIG_POLARITY_Pos)
| (S2 << GPIOTE_CONFIG_PSEL_Pos)
| (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos);
NVIC_EnableIRQ(GPIOTE_IRQn); //must disable GPIOTE interrupt or PPI
NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_IN0_Set << GPIOTE_INTENSET_IN0_Pos;
NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_IN1_Set << GPIOTE_INTENSET_IN1_Pos;
}
int main(void)
{
uint16_t speeds;
time1_init();
EXIT_KEYS_Init();
ppi_init();
// Initialize
leds_init();
timers_init();
buttons_init();
uart_init();
ble_stack_init();
gap_params_init();
services_init();
advertising_init();
conn_params_init();
sec_params_init();
simple_uart_putstring(START_STRING);
advertising_start();
LED_Init();
capture_state=1;
for (;;)
{........}
}
I use the example S110 \experimental\ble_app_uart.
SofeDevices: S110 6.0.0
Board: PCA10001
IC: nRF51822 xxaa
Any idea about it?
