ADC of zephyr

RE: ADC of zephyr

Jason — Wed, 30 Mar 2022 08:56:30 GMT

No any other details, just add "IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_SAADC), 1, nrfx_isr, nrfx_saadc_irq_handler, 0);"

before

"nrfx_saadc_init"

RE: ADC of zephyr

sredaley — Wed, 23 Mar 2022 02:38:18 GMT

Can you detail your fix here? I think I'm running into the same issue. I cannot get the IRQ based mode to run. When including the IRQ_Connect line I get an error and cannot build.

RE: ADC of zephyr

Jason — Wed, 05 Jan 2022 02:18:37 GMT

Hi Priyanka,

I have found the answer， it needs to use Zephyr's method to set up ISR first.

IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_SAADC), 1, nrfx_isr, nrfx_saadc_irq_handler, 0);

RE: ADC of zephyr

Priyanka — Mon, 20 Dec 2021 14:59:47 GMT

Hi Jason,

I am looking into your case and will get back to you soon. We are understaffed at the moment due to the holiday season and hence kindly expect some delays in the replies.

Thank you for understanding,

Regards,

Priyanka

RE: ADC of zephyr

Jason — Fri, 17 Dec 2021 02:03:46 GMT

Hi Priyanka,

I just create an application from zephyr/samples/hello_world, and copy the ADC sample code to the main.c,

if the event handler is NULL, it works.

nrfx_saadc_simple_mode_set((1 << 0),

NRF_SAADC_RESOLUTION_12BIT,

NRF_SAADC_OVERSAMPLE_DISABLED,

NULL);

if set the event handler, it does not work.

nrfx_saadc_simple_mode_set((1 << 0),

NRF_SAADC_RESOLUTION_12BIT,

NRF_SAADC_OVERSAMPLE_DISABLED,

event_handler
);

I attached the main.c and prj.conf as below.

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr.h>
#include <sys/printk.h>
#include <stdbool.h>
#include <stdint.h>
#include <nrfx_saadc.h>

static volatile bool is_ready;
static nrf_saadc_value_t sample;

nrfx_saadc_channel_t channel = NRFX_SAADC_DEFAULT_CHANNEL_SE(NRF_SAADC_INPUT_VDD, 0);
#define BATTERY_VOLTAGE(sample) (sample * 6 * 600UL / (1 << 12))
static void handle_error(nrfx_err_t error_code)
{
	if (error_code != NRFX_SUCCESS)
	{
		// error
		while (1)
		{
		};
	}
}

static void event_handler(nrfx_saadc_evt_t const *p_event)
{
	if (p_event->type == NRFX_SAADC_EVT_DONE)
	{
		// Buffer with data is available here: p_event->data.done.p_buffer
		is_ready = true;
	}
}

int main(void)
{
	nrfx_err_t err_code;

	err_code = nrfx_saadc_init(NRFX_SAADC_DEFAULT_CONFIG_IRQ_PRIORITY);
	handle_error(err_code);

	err_code = nrfx_saadc_channels_config(&channel, 1);
	handle_error(err_code);

	err_code = nrfx_saadc_simple_mode_set((1 << 0),
										  NRF_SAADC_RESOLUTION_12BIT,
										  NRF_SAADC_OVERSAMPLE_DISABLED,
										  NULL);
	handle_error(err_code);

	err_code = nrfx_saadc_buffer_set(&sample, 1);
	handle_error(err_code);
	printk("Hello World! %s\n", CONFIG_BOARD);
	while (1)
	{
		err_code = nrfx_saadc_mode_trigger();
		handle_error(err_code);
		printk("sample %u", BATTERY_VOLTAGE(sample));
		k_msleep(1000);
	}
}

the pri.conf, only enable CONFIG_NRFX_SAADC

CONFIG_NRFX_SAADC=y

RE: ADC of zephyr

Priyanka — Thu, 16 Dec 2021 14:10:53 GMT

Hi Jason,

What have you included in the folder where the example is stored, i.e., the folder with the prj.conf, src and any other files that you have created. It would be helpful if you could share your folder.

Regards,

Priyanka

RE: ADC of zephyr

Priyanka — Mon, 13 Dec 2021 14:53:21 GMT

Hi Jason,

Sorry for the delayed response. I am looking into this and will get back to you soon.

Regards,

Priyanka