Hello everyone,
I have a custom board with an nRF5340, which currently uses the internal clock.
I'm trying to use the RV8263-C8 RTC to achieve accurate real-time tracking.
Here is my schematic:
My .dts:
&pinctrl {
i2c1_default: i2c1_default {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
<NRF_PSEL(TWIM_SCL, 1, 3)>;
};
};
i2c1_sleep: i2c1_sleep {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
<NRF_PSEL(TWIM_SCL, 1, 3)>;
low-power-enable;
};
};
};
&i2c1 {
compatible = "nordic,nrf-twim";
status = "okay";
clock-frequency = <400000>;
zephyr,concat-buf-size = <512>;
pinctrl-0 = <&i2c1_default>;
pinctrl-1 = <&i2c1_sleep>;
pinctrl-names = "default", "sleep";
rv_8263_c8: rv-8263-c8@51 {
compatible = "microcrystal,rv-8263-c8";
reg = <0x51>;
status = "okay";
clkout = <1024>;
int-gpios = <&gpio1 0 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
};
};
When I running the sample code:
#include <zephyr/kernel.h>
#include <zephyr/drivers/rtc.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(rtc_test, LOG_LEVEL_INF);
const struct device *rtc_dev = DEVICE_DT_GET(DT_NODELABEL(rv_8263_c8));
int main(void) {
if (!device_is_ready(rtc_dev)) {
LOG_ERR("RTC device not ready");
return -1;
}
struct rtc_time set_time = {
.tm_sec = 0,
.tm_min = 0,
.tm_hour = 0,
.tm_mday = 1,
.tm_mon = 1,
.tm_year = 125,
.tm_wday = 1,
};
if (rtc_set_time(rtc_dev, &set_time) != 0) {
LOG_ERR("Failed to set RTC time");
return -1;
}
while (1) {
struct rtc_time curr_time;
if (rtc_get_time(rtc_dev, &curr_time) == 0) {
LOG_INF("Time: %02d:%02d:%02d", curr_time.tm_hour, curr_time.tm_min, curr_time.tm_sec);
} else {
LOG_ERR("Failed to read RTC");
}
k_sleep(K_SECONDS(1));
}
return 0;
}
My output:
SEGGER J-Link V8.12 - Real time terminal output SEGGER J-Link (unknown) V1.0, SN=1050200307 Process: JLinkExe [00:00:00.002,593] <dbg> microcrystal_rv8263c8: rv8263c8_in[00:00:00.001,159] <dbg> microcrystal_rv8263c8: rv8263c8_init: Configure ClkOut: 5 [00:00:00.006,561] <dbg> microcrystal_rv8263c8: rv8263c8_init: Configure ClkOut: 5 *** Booting nRF Connect SDK v2.9.0-7787b2649840 *** *** Using Zephyr OS v3.7.99-1f8f3dc29142 *** [00:00:02.161,743] <dbg> microcrystal_rv8263c8: rv8263c8_time_set: Set time: year = 125, mon = 1, mday = 1, wday = 1, hour = 0, min = 0, sec = 0 [00:00:02.672,515] <err> rtc_test: Failed to read RTC [00:00:04.177,856] <err> rtc_test: Failed to read RTC [00:00:05.683,166] <err> rtc_test: Failed to read RTC [00:00:07.188,476] <err> rtc_test: Failed to read RTC [00:00:08.693,786] <err> rtc_test: Failed to read RTC [00:00:10.199,127] <err> rtc_test: Failed to read RTC
Using an oscilloscope, I observed that SDA and SCL show the same waveform.
I’ve tried running other samples, but I keep getting the same issue.
When I add bias-pull-up to the pinctrl, I get a "device not ready" error.
Has anyone encountered this before or knows what might be going wrong?
Any help would be greatly appreciated!