Reading ADC value from analog input

RE: Reading ADC value from analog input

Stefan Birnir Sverrisson — Tue, 21 Apr 2015 11:43:30 GMT

Have you perhaps followed this example? Your configuration seems correct. What if you try to run the linked example directly, does that work?

RE: Reading ADC value from analog input

Justin — Thu, 16 Apr 2015 19:34:17 GMT

Thank you for an advice! I tried adding the following line of code before enabling ADC

nrf_gpio_cfg_input(NRF_GPIO_PORT_SELECT_PORT0, GPIO_PIN_CNF_PULL_Disabled);

Since the input pin P0_5 is part of GPIO PORT 0. However, the adc result was unchanged. Did I use the function correctly to configure GPIO?

RE: Reading ADC value from analog input

Håkon Alseth — Wed, 15 Apr 2015 22:01:19 GMT

It might be that the input buffer (in NRF_GPIO->PIN_CNF[mypin]) is not connected at your specific GPIO. Try calling nrf_gpio_cfg_input to connect this inside the GPIO peripheral, then do the AD conversion.

Cheers, Håkon