#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/sys/printk.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/drivers/adc.h>

#define ADC_NODE DT_NODELABEL(adc1)

#if !DT_NODE_HAS_STATUS(ADC_NODE, okay)
#error "ADC1 not available; Enable it in a board overlay if needed."
#endif

static const struct device *const adc_dev = 
	DEVICE_DT_GET(ADC_NODE);

static uint16_t sample;

// Channel Configuration
static struct adc_channel_cfg ch1_cfg = {
    .gain             = ADC_GAIN_1,
    .reference        = ADC_REF_INTERNAL,
    .acquisition_time = ADC_ACQ_TIME_DEFAULT,
    .channel_id       = 1,
    .differential     = 0,
};

static struct adc_sequence seq = {
    .channels    = BIT(1),  // Channel bitmap
    .buffer      = &sample,
    .buffer_size = sizeof(sample),
    .resolution  = 12,  // 12-bit
};

int main(void) {
    
    if(!device_is_ready(adc_dev)) {
        return 0;
    }

    // Configure the channel
    if(adc_channel_setup(adc_dev, &ch1_cfg) != 0) {
        return 0;
    }

	printk("\r\n[ADC] PA1(ADVC1_IN1) polling\r\n");

	while (1) {

		int rc = adc_read(adc_dev, &seq);
		if(rc == 0) {
            uint16_t raw = sample;
            printk("ADC raw value = %u\r\n", raw);
        }

		k_sleep(K_MSEC(50));

	}

	return 0;
}