Hello,
I have some issues to do function an ntc thermistor with a nrf54L15DK.
An error about a wrong configuration of the adc reference or or the ADC gain appears almost everytime, and when it doesn't appear, nothing appear in the console.
Here is my prj.conf :
CONFIG_CBPRINTF_FP_SUPPORT=y
CONFIG_GPIO=y
CONFIG_ADC=y
CONFIG_SENSOR=y
CONFIG_NTC_THERMISTOR=y
CONFIG_LOG=y
CONFIG_LOG_DEFAULT_LEVEL=3
CONFIG_MAIN_STACK_SIZE=2048
# Active le pilote SAADC sur nRF
# (Optionnel) Permet le runtime PM si vous utilisez zephyr,pm-device-runtime-auto
CONFIG_PM_DEVICE_RUNTIME=y
CONFIG_PM_DEVICE=y
CONFIG_SERIAL=n
CONFIG_CONSOLE=n
CONFIG_RTT_CONSOLE=y
CONFIG_PRINTK=y
my overlay file :
/ {
ntc0: ntc_thermistor {
compatible = "ntc-thermistor-generic";
status = "okay";
io-channels = <&adc 4>;
pullup-uv = <3300>;
pullup-ohm = <10000>; // résistance pull-up du module
pulldown-ohm = <10000>; // résistance fixe de votre diviseur (NTC en pulldown)
zephyr,compensation-table =
<(0) 33869>,
<(10) 20260>,
<(20) 12552>,
<(30) 8026>,
<(40) 5281>,
<(50) 3565>,
<(60) 2465>,
<(70) 1741>,
<(80) 1254>,
<(90) 920>,
<(100) 686>;
};
};
/ {
zephyr,user {
io-channels = <&adc 4>;
};
};
&adc { // on accède au périphérique ADC
#address-cells = <1>; // chaque enfant a 1 valeur dans reg, le canal
#size-cells = <0>; // pas de taille pour reg(seulement utile pour la mémoire)
status = "okay"; // active le périphérique
channel@4 { // on configure le canal 0 du SAADC
reg = <0x4>; // est le numéro du canal ADC
zephyr,gain = "ADC_GAIN_1"; // diviseur de tension, ici 6
zephyr,reference = "ADC_REF_INTERNAL"; // utilise la référence interne de 0.6 V
//zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>; //Temps de capture de la tension, ici 10 micro sec
zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 1)>;
//zephyr,input-positive = <NRF_SAADC_AIN0>; // définit l’entrée connectée physiquement AIN0 = P0.04
zephyr,input-positive = <NRF_SAADC_AIN4>; /* P1.11 for the nRF54L15 DK */
//zephyr,resolution = <12>; // résolution du convertisseur en 12 bits
};
};
and my main.c file :
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/logging/log.h>
#include <zephyr/devicetree.h>
#include <hal/nrf_saadc.h>
LOG_MODULE_REGISTER(app);
int main(void)
{
// printk("Gain 1/6 = %d\n", NRF_SAADC_GAIN1_2);
// printk("Gain 1/4 = %d\n", NRF_SAADC_GAIN1_4);
printk("gdrgsrt");
printk("NTC sensor not ready");
const struct device *dev = DEVICE_DT_GET(DT_NODELABEL(ntc0));
if (!device_is_ready(dev)) {
LOG_ERR("NTC sensor not ready");
return 1;
}
// if (sensor_init(dev) < 0) {
// LOG_ERR("Failed to init");
// continue;
// }
while (1) {
struct sensor_value temp;
if (sensor_sample_fetch(dev) < 0) {
LOG_ERR("Failed to fetch sample");
continue;
}
if (sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp) < 0) {
LOG_ERR("Failed to get temperature");
continue;
}
LOG_INF("Temperature: %d.%06d C", temp.val1, temp.val2);
k_sleep(K_SECONDS(1));
}
}
Thank you !
