problem with nrf52832 gpio

RE: problem with nrf52832 gpio

toddyu — Tue, 11 Oct 2022 09:15:13 GMT

R52:10K;R41:1M;K5DET2 is GPIO input;K5DET1 is GPIO output.The two pins are connected with a 10Kohm resistor and a switch.There are 6 switches in my design.P0.20 and P0.22 are only mentioned as example.When the switch is open,the voltage level of output pin is 3.6V,the input pin is 0V.When the switch is closed,I expect the voltage level on the input pin would be 3.6V.But actually the voltage level varied,3.6V,2.6V,2V,0.4V,e.g.

RE: problem with nrf52832 gpio

toddyu — Tue, 11 Oct 2022 08:11:39 GMT

#define J11_IN 22
#define J11_OUT 20
int main(void)
{
bool erase_bonds;

log_init();
NRF_LOG_INFO("TX_TANZHUAN %s started %s %s.", APP_VERSION, __DATE__, __TIME__);

timers_init();
leds_init(&erase_bonds);
gpiote_init();
record_init();
set_sensor_id(Readid());
NRF_LOG_INFO("id:%s", get_sensor_id());
nrf_gpio_cfg(
J11_OUT,
NRF_GPIO_PIN_DIR_OUTPUT,
NRF_GPIO_PIN_INPUT_DISCONNECT,
NRF_GPIO_PIN_PULLUP,
NRF_GPIO_PIN_S0H1,
NRF_GPIO_PIN_NOSENSE);

nrf_gpio_cfg_output(J9_OUT);
nrf_gpio_pin_set(J11_OUT);
nrf_gpio_pin_set(J9_OUT);
nrf_gpio_cfg_input(J9_IN,NRF_GPIO_PIN_NOPULL);
// nrf_gpio_cfg_input(J10_IN,NRF_GPIO_PIN_NOPULL);
nrf_gpio_cfg(
J11_IN,
NRF_GPIO_PIN_DIR_INPUT,
NRF_GPIO_PIN_INPUT_CONNECT,
NRF_GPIO_PIN_NOPULL,
NRF_GPIO_PIN_S0S1,
NRF_GPIO_PIN_NOSENSE);

NRF_LOG_INFO("num8 %d",nrf_gpio_pin_read(J8_IN));
NRF_LOG_INFO("num9 %d",nrf_gpio_pin_read(J9_IN));
NRF_LOG_INFO("num10 %d",nrf_gpio_pin_read(J10_IN));
NRF_LOG_INFO("num11 %d",nrf_gpio_pin_read(J11_IN));
NRF_LOG_INFO("num6 %d",nrf_gpio_pin_read(J6_IN));
while(1);

RE: problem with nrf52832 gpio

Turbo J — Tue, 11 Oct 2022 08:07:49 GMT

Show us code. Note that you can pullup resistors on GPIO inputs that are only a bit larger than 10k per datasheet.

That could explain your 2V resulting voltage on the pin.