hardfault about the saadc channel init

RE: hardfault about the saadc channel init

haakonsh — Thu, 03 Dec 2020 09:35:24 GMT

I'll try to set it up on my end.

Have you disabled ASSERTs for that project? What SDK are you using for these two projects?

All instances of the nrf_drv_saadc_channel_init in the nRF5 SDK 12.3 and upwards contain the following check:

ASSERT((p_config->pin_p <= NRF_SAADC_INPUT_VDD) &&(p_config->pin_p > NRF_SAADC_INPUT_DISABLED));

Where NRF_SAADC_INPUT_VDD = 0x9 and NRF_SAADC_INPUT_DISABLED = 0x0.

RE: hardfault about the saadc channel init

Leogean — Wed, 02 Dec 2020 16:29:05 GMT

Thanks for your reply. I extract the saadc part from my project. The terminal output and the register setting are the same as the pictures before. It should print three sample values in the terminal. Please have a try.

Thanks a lot.

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdint.h>
#include <ble_gap.h>
#include "nrf.h"
#include "app_util_platform.h"
#include "nrf_delay.h"
#include "app_timer.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf_log.h"
#include "boards.h"
#include "pca10056.h"
#include "nrf_gpio.h"
#include "nrf_drv_timer.h"
#include "nrfx_gpiote.h"
#include "nrf_drv_gpiote.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_rtc.h"
#include "nrf_drv_clock.h"
#include "nrf_drv_lpcomp.h"
#include "nrf_drv_saadc.h"
#include "nrf_drv_twi.h"
#include "nrf_libuarte_async.h"
#include "app_pwm.h"

#define SAADC_SAMPLES_IN_BUFFER 3

nrf_saadc_channel_config_t channel[3]; //saadc channel
nrf_drv_saadc_config_t saadc_config;  //saadc
static nrf_saadc_value_t buffer[2][SAADC_SAMPLES_IN_BUFFER];  //buffer for saadc
int adcData[3];

/*saadc data read*/
void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
{
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    {
        ret_code_t err_code;

        err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAADC_SAMPLES_IN_BUFFER);

        for (int i = 0; i < SAADC_SAMPLES_IN_BUFFER; i++)
        {
            adcData[i] = p_event->data.done.p_buffer[i];
        }
    }
}

void saadc_init()
{
    nrf_drv_saadc_init(&saadc_config, saadc_callback); //initial the saadc with the callback function
    saadc_config.resolution = 2; //res = 12?

    channel[0].reference = NRF_SAADC_REFERENCE_VDD4; //reference vvd
    channel[0].gain = NRF_SAADC_GAIN1_4; //gain 1/4
    channel[0].acq_time = NRF_SAADC_ACQTIME_3US; //tacq=3
    channel[0].pin_p = 31; //D31? positive pin?
    nrf_drv_saadc_channel_init(0, &channel[0]);

    channel[1].reference = NRF_SAADC_REFERENCE_INTERNAL; //refvvd false
    channel[1].gain = NRF_SAADC_GAIN1_6;
    channel[1].acq_time = NRF_SAADC_ACQTIME_3US;
    channel[1].pin_p = 28;
    nrf_drv_saadc_channel_init(1, &channel[1]);

    channel[2].reference = NRF_SAADC_REFERENCE_VDD4;
    channel[2].gain = NRF_SAADC_GAIN1_6;
    channel[2].acq_time = NRF_SAADC_ACQTIME_3US;
    channel[2].pin_p = 30;
    nrf_drv_saadc_channel_init(2, &channel[2]);

    nrf_drv_saadc_buffer_convert(buffer[0], SAADC_SAMPLES_IN_BUFFER); //read sample from saadc to buffer?
    nrf_drv_saadc_buffer_convert(buffer[1], SAADC_SAMPLES_IN_BUFFER);
}

void updateADC()
{
        for(int i=0; i<3; i++)
        {
            nrf_drv_saadc_sample();
            printf("%d \n", i);
        }
}

int main(void)
{
    printf("hello\n");
    saadc_init();
    updateADC();
    printf("%d, %d, %d \n", adcData[0], adcData[1], adcData[2]);

}

RE: hardfault about the saadc channel init

haakonsh — Wed, 02 Dec 2020 09:31:04 GMT

Have you read the definition of nrf_drv_saadc_channel_init/nrfx_saadc_channel_init?

[quote user="Leogean"]the register can set properly and I can get the sample value. [/quote]

Are you sure? Can you share that code?

RE: hardfault about the saadc channel init

Leogean — Tue, 01 Dec 2020 19:01:18 GMT

Thanks for your response. I try to change yp to 6 which is AIN2, but it still jump to the hardfault handler. after initialize the channel Also, in another project, I am using pin 28, 30 and 31 as the positive input and you can see from the picture, the register can set properly and I can get the sample value.

By the way, could you please tell me what will cause the hard fault issue?

Thanks very much for your help:)

RE: hardfault about the saadc channel init

haakonsh — Tue, 01 Dec 2020 11:28:26 GMT

28 is not a valid input.

See nrfx_saadc_channel_init, nrf_saadc_channel_config_t, and nrf_saadc_input_t.

RE: hardfault about the saadc channel init

Leogean — Fri, 27 Nov 2020 16:09:43 GMT

Ah sorry, xp is 5 and yp is 28

RE: hardfault about the saadc channel init

haakonsh — Fri, 27 Nov 2020 10:12:05 GMT

What is yp?