nrf52832 custom board: nrf_gpio_pin_write() does not work (nor nrf_gpio_pin_clear())

RE: nrf52832 custom board: nrf_gpio_pin_write() does not work (nor nrf_gpio_pin_clear())

JohnM — Sun, 06 May 2018 22:25:25 GMT

Yes you're absolutely right! The LED anode is connected to Vdd.

I didn't even think about that.

Thanks.

RE: nrf52832 custom board: nrf_gpio_pin_write() does not work (nor nrf_gpio_pin_clear())

Einar Thorsrud — Fri, 04 May 2018 08:33:49 GMT

Is the GPIO connected to the anode or cathode of the LED on your board? The reason I ask is that you write that the LED is on after the call to nrf_gpio_cfg_output(). However, this does not set the GPIO to '1', and the reset value of the OUT register is all zero. So essentially, it seems that your LED is connected with the anode to VDD and the cathode to VSS via the GPIO which causes it to be on when the GPIO is '0' and off when the GPIO is '1'. If this is the case, then calling nrf_gpio_pin_write(LED_1,1); or nrf_gpio_pin_set(LED_1); will turn off the LED.

RE: nrf52832 custom board: nrf_gpio_pin_write() does not work (nor nrf_gpio_pin_clear())

JohnM — Thu, 03 May 2018 12:24:36 GMT

nrf_gpio_cfg_output(LED_1);
NRF_GPIO_Type * reg        = nrf_gpio_pin_port_decode((uint32_t *)LED_1);
nrf_delay_ms(1000);
nrf_gpio_pin_write(LED_1,0):
reg        = nrf_gpio_pin_port_decode((uint32_t *)LED_1);
uint32_t        pins_state = reg->OUT;

Here is just BEFORE the nrf_gpio_pin_write(LED_1,0):

AFTER this write(), value of reg remains the same...

RE: nrf52832 custom board: nrf_gpio_pin_write() does not work (nor nrf_gpio_pin_clear())

JohnM — Thu, 03 May 2018 11:47:43 GMT

Well for my aplication, I've just taken the simple Blinky:

C:\NORDIC\nRF5_SDK_12.3.0_d7731ad\examples\peripheral\blinky\pca10040\blank\arm5_no_packs\blinky_pca10040.uvprojx

RE: nrf52832 custom board: nrf_gpio_pin_write() does not work (nor nrf_gpio_pin_clear())

Einar Thorsrud — Thu, 03 May 2018 11:08:19 GMT

This sounds a bit strange. I suspect there is something fishy with your application. Can you upload a short but complete application that demonstrate this? Also, can you read back the OUT register after each write to see that it is set correctly?