First commit

drivers/battery_adc/battery_adc.c

@@ -0,0 +1,50 @@
+#include "battery_adc.h"
+#include <zephyr/drivers/adc.h>
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/sys/printk.h>
+
+#define USER_NODE DT_PATH(zephyr_user)
+static const struct gpio_dt_spec btt_meas_en = GPIO_DT_SPEC_GET(USER_NODE, btt_meas_en_gpios);
+static const struct adc_dt_spec adc_channel = ADC_DT_SPEC_GET(USER_NODE);
+
+static uint32_t sample_buffer;
+
+struct adc_sequence sequence = {
+    .buffer = &sample_buffer,
+    .buffer_size = sizeof(sample_buffer),
+    //.calibrate = true
+};
+
+int battery_adc_init(void) {
+    if (!adc_is_ready_dt(&adc_channel)) {
+        printk("ADC not ready\n");
+        return -ENODEV;
+    }
+    gpio_pin_configure_dt(&btt_meas_en, GPIO_OUTPUT_INACTIVE);
+    int ret = 0;
+    ret = adc_channel_setup_dt(&adc_channel);
+    if(ret){
+        return ret;
+    }
+    ret = adc_sequence_init_dt(&adc_channel, &sequence);
+    if(ret){
+        return ret;
+    }
+}
+
+int battery_measure_mv(int32_t *mv_out) {
+    int ret = 0;
+    gpio_pin_set_dt(&btt_meas_en, 1);  // enable measurement
+    k_sleep(K_MSEC(5));
+
+
+    ret = adc_read(adc_channel.dev, &sequence);
+    if (ret) return ret;
+
+    ret = adc_raw_to_millivolts_dt(&adc_channel, &sample_buffer);
+    *mv_out = (int)((float)sample_buffer*((270.0f+110.0f)/270.0f));
+
+    gpio_pin_set_dt(&btt_meas_en, 0);  // disable measurement
+
+    return ret;
+}

drivers/battery_adc/battery_adc.h

@@ -0,0 +1,9 @@
+#ifndef BATTERY_ADC_H
+#define BATTERY_ADC_H
+
+#include <stdint.h>
+
+int battery_adc_init(void);
+int battery_measure_mv(int32_t *mv_out);
+
+#endif // BATTERY_ADC_H