Add my_adc/

apps/my_adc/src/main.c

@@ -0,0 +1,75 @@
+#include <inttypes.h>
+#include <stdint.h>
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/adc.h>
+#include <zephyr/sys/printk.h>
+
+#define MY_ADC_NODE       DT_ALIAS(myadc)
+#define MY_ADC_CH_NODE    DT_CHILD(MY_ADC_NODE, channel_3)
+#define MY_ADC_CHANNEL_ID DT_REG_ADDR(MY_ADC_CH_NODE)
+
+static const struct device *const adc_dev = 
+	DEVICE_DT_GET(MY_ADC_NODE);
+
+static const struct adc_channel_cfg ch_cfg =
+	ADC_CHANNEL_CFG_DT(MY_ADC_CH_NODE);
+
+static uint16_t sample;
+
+static struct adc_sequence seq = {
+	.channels = BIT(MY_ADC_CHANNEL_ID),
+	.buffer = &sample,
+	.buffer_size = sizeof(sample),
+	.resolution = DT_PROP_OR(MY_ADC_CH_NODE, zephyr_resolution, 12),
+};
+
+int main(void) {
+
+	int err;
+
+	if (!device_is_ready(adc_dev)) {
+		printk("ADC device not ready\n");
+		return 0;
+	}
+
+	err = adc_channel_setup(adc_dev, &ch_cfg);
+	if (err < 0) {
+		printk("Could not setup ADC channel (%d)\n", err);
+		return 0;
+	}
+
+	printk("Reading ADC1 channel 3 on PA3 (Arduino A0)\n");
+
+	while (1) {
+		int32_t val_mv;
+		sample = 0;
+
+		err = adc_read(adc_dev, &seq);
+		if (err < 0) {
+			printk("Could not read ADC (%d)\n", err);
+			k_sleep(K_MSEC(500));
+			continue;
+		}
+
+		if (ch_cfg.differential) {
+			val_mv = (int32_t)((int16_t)sample);
+		} else {
+			val_mv = (int32_t)sample;
+		}
+
+		printk("ADC raw: %" PRId32, val_mv);
+		err = adc_raw_to_millivolts(adc_ref_internal(adc_dev), ch_cfg.gain,
+									seq.resolution, &val_mv);
+		if (err < 0) {
+			printk(" (voltage conversion not available)\n");
+		} else {
+			printk(" Voltage: %" PRId32 " mV\n", val_mv);
+		}
+
+		k_sleep(K_MSEC(500));
+	}
+
+	return 0;
+}