Hello,
I would like to attach interrupts to the following pins on the P0 GPIO and the P1 GPIO:
P0:
- 21
- 23
- 27
P1:
- 11
- 12
- 13
- 14
- 15
However, it seems that there is only one GPIOTE instance on the NRF52840 (which corresponds to P0).
How would I go about attaching interrupts to the P1 pins?
To give you some background, I am developing on an Arduino Nano 33 BLE, and would like to have interrupts attached to pins on both GPIO instances through its NRF52840.
Right now, the calling the function: init_gpio_interrupts() causes the board to freeze a few 100 clock cycles later.
// Rising Edge Interrupt for GPIO (D2-9) Events
extern "C" void GPIOTE_IRQHandler_v() {
if (NRF_GPIOTE->EVENTS_IN[0] == 1)
{
NRF_GPIOTE->EVENTS_IN[0] = 0;
// Code Here
}
else if (NRF_GPIOTE->EVENTS_IN[1] == 1)
{
NRF_GPIOTE->EVENTS_IN[1] = 0;
// Code Here
}
else if (NRF_GPIOTE->EVENTS_IN[2] == 1)
{
NRF_GPIOTE->EVENTS_IN[2] = 0;
// Code Here
}
else if (NRF_GPIOTE->EVENTS_IN[3] == 1)
{
NRF_GPIOTE->EVENTS_IN[3] = 0;
// Code Here
}
else if (NRF_GPIOTE->EVENTS_IN[4] == 1)
{
NRF_GPIOTE->EVENTS_IN[4] = 0;
// Code Here
}
else if (NRF_GPIOTE->EVENTS_IN[5] == 1)
{
NRF_GPIOTE->EVENTS_IN[5] = 0;
// Code Here
}
else if (NRF_GPIOTE->EVENTS_IN[6] == 1)
{
NRF_GPIOTE->EVENTS_IN[6] = 0;
// Code Here
}
else if (NRF_GPIOTE->EVENTS_IN[7] == 1)
{
NRF_GPIOTE->EVENTS_IN[7] = 0;
// Code Here
}
}
#define GPIO_P0 0UL
#define GPIO_P1 1UL
#define D2_PIN_NUM 11UL
#define D3_PIN_NUM 12UL
#define D4_PIN_NUM 15UL
#define D5_PIN_NUM 13UL
#define D6_PIN_NUM 14UL
#define D7_PIN_NUM 23UL
#define D8_PIN_NUM 21UL
#define D9_PIN_NUM 27UL
constexpr uint32_t GPIOTE_PIN_NUMS[] = {D2_PIN_NUM,
D3_PIN_NUM,
D4_PIN_NUM,
D5_PIN_NUM,
D6_PIN_NUM,
D7_PIN_NUM,
D8_PIN_NUM,
D9_PIN_NUM};
constexpr uint32_t GPIOTE_PINS[] = {D2,
D3,
D4,
D5,
D6,
D7,
D8,
D9};
constexpr uint32_t NUM_GPIOTE_PINS = sizeof(GPIOTE_PINS) / sizeof(uint32_t);
enum NRF_GPIOTE_CONFIG_POS
{
GPIOTE_CONFIG_MODE_POS = 0UL,
GPIOTE_CONFIG_PSEL_POS = 8UL,
GPIOTE_CONFIG_PORT_POS = 13UL,
GPIOTE_CONFIG_POLARITY_POS = 16UL,
GPIOTE_CONFIG_OUTINIT_POS = 20UL
};
void configure_digital_pins_for_gpiote()
{
NRF_GPIOTE->CONFIG[0] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D7_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P0 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
NRF_GPIOTE->CONFIG[1] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D8_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P0 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
NRF_GPIOTE->CONFIG[2] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D9_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P0 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
NRF_GPIOTE->CONFIG[3] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D2_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P1 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
NRF_GPIOTE->CONFIG[4] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D3_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P1 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
NRF_GPIOTE->CONFIG[5] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D4_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P1 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
NRF_GPIOTE->CONFIG[6] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D5_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P1 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
NRF_GPIOTE->CONFIG[7] = (1UL << GPIOTE_CONFIG_MODE_POS) |
(D6_PIN_NUM << GPIOTE_CONFIG_PSEL_POS) |
(GPIO_P1 << GPIOTE_CONFIG_PORT_POS) |
(NRF_GPIOTE_POLARITY_LOTOHI << GPIOTE_CONFIG_POLARITY_POS);
}
void configure_gpiote_for_events()
{
configure_digital_pins_for_gpiote();
// Enable GPIOTE Interrupts
nrf_gpiote_int_enable(NRF_GPIOTE_INT_IN0_MASK |
NRF_GPIOTE_INT_IN1_MASK |
NRF_GPIOTE_INT_IN2_MASK |
NRF_GPIOTE_INT_IN3_MASK |
NRF_GPIOTE_INT_IN4_MASK |
NRF_GPIOTE_INT_IN5_MASK |
NRF_GPIOTE_INT_IN6_MASK |
NRF_GPIOTE_INT_IN7_MASK);
NVIC_SetVector(GPIOTE_IRQn, (uint32_t)&GPIOTE_IRQHandler_v);
NVIC_SetPriority( GPIOTE_IRQn, 1UL );
NVIC_EnableIRQ( GPIOTE_IRQn );
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///
/// INITIALIZATION
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void init_gpio_interrupts()
{
init_event_buffer_ptrs();
configure_gpiote_for_events();
}
Thanks!
