I have12 input pins to my application. But the code fails when I try to add the fifth button.
Is there a limit to how many input signals I can add?
static void gpio_inputs_init(void)
{
uint32_t err_code;
if (!nrf_drv_gpiote_is_init())
{
err_code = nrf_drv_gpiote_init();
APP_ERROR_CHECK(err_code);
}
setup_button(PIN_BUTTON_0);
setup_button(PIN_BUTTON_1);
setup_button(PIN_BUTTON_2);
setup_button(PIN_BUTTON_3);
setup_button(PIN_BUTTON_4);
setup_button(PIN_BUTTON_5);
setup_button(PIN_BUTTON_6);
setup_button(PIN_BUTTON_7);
setup_button(PIN_BUTTON_8);
setup_button(PIN_BUTTON_9);
setup_button(PIN_BUTTON_CLEAR);
setup_button(PIN_BUTTON_OK);
}
static void setup_button(nrf_drv_gpiote_pin_t pin)
{
uint32_t err_code;
nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false);
in_config.pull = NRF_GPIO_PIN_PULLUP;
err_code = nrf_drv_gpiote_in_init(pin, &in_config,
in_pin_event_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_gpiote_in_event_enable(pin, true);
}
I have single stepped my code and it is channel_port_alloc() that is called by nrf_drv_gpiote_in_init() that returns NO_CHANNELS:
ret_code_t nrf_drv_gpiote_in_init(nrf_drv_gpiote_pin_t pin,
nrf_drv_gpiote_in_config_t const * p_config,
nrf_drv_gpiote_evt_handler_t evt_handler)
{
ASSERT(pin < NUMBER_OF_PINS);
ret_code_t result = NRF_SUCCESS;
/* Only one GPIOTE channel can be assigned to one physical pin. */
if (pin_in_use_by_gpiote(pin))
{
result = NRF_ERROR_INVALID_STATE;
}
else
{
int8_t channel = channel_port_alloc(pin, evt_handler, p_config->hi_accuracy); <---- **** This function gives the error ****
if (channel != NO_CHANNELS)
{
if (p_config->is_watcher)
{
nrf_gpio_cfg_watcher(pin);
}
else
{
nrf_gpio_cfg_input(pin,p_config->pull);
}
if (p_config->hi_accuracy)
{
nrf_gpiote_event_configure(channel, pin,p_config->sense);
}
else
{
m_cb.port_handlers_pins[channel-NUMBER_OF_GPIO_TE] |= (p_config->sense)<< SENSE_FIELD_POS;
}
}
else
{
result = NRF_ERROR_NO_MEM;
}
}
return result;
}
