ak-kr-project/Core/Src/DNI.c

#include "main.h"
#include "generic_macros.h"
#include "lcd.h"
#include "DNI.h"

static int DNI_read(void)
{
	HAL_ADC_Start(&hadc1);

	HAL_StatusTypeDef s = HAL_ADC_PollForConversion(&hadc1, 100);

	if (HAL_OK != s)
		return -s;
	else
		return HAL_ADC_GetValue(&hadc1);
}

static int DNI_convert_to_celsius(int value)
{
	return (2512 - value) << 2;
}

static void DNI_print(int temperature)
{
	int add_sign = temperature < 0;
	if (add_sign)
		temperature = ~(temperature - 1); // if value is not positive, the string conversion will break

	int temp1 = temperature;

	for (int i = 0; i < 2; i++) {
		temperature /= 10;
		display_write_data_byte('0' + (char) (temp1 - temperature * 10));
		temp1 = temperature;
	}

	display_write_data_byte('.');

	for (int i = 0; i < 3; i++) {
		temperature /= 10;
		display_write_data_byte('0' + (char) (temp1 - temperature * 10));
		temp1 = temperature;

		if (temp1 == 0) {
			display_write_data_seq("  ");
			break;
		}
	}

	if (add_sign) {
		DISPLAY_SET_CURSOR(1, 9);
		display_write_data_byte('-');
	}
}

static void DNI_print_celsius(int temperature)
{
	DISPLAY_SET_CURSOR(1, 15);
	DISPLAY_SET_DECREMENT;
	display_write_data_seq("C ");

	DNI_print(temperature);
}

static void print_ok(void)
{
	DISPLAY_SET_CURSOR(1, 4);
	DISPLAY_SET_INCREMENT;
	display_write_data_seq("OK");
}

static void print_error(int err_code)
{
	DISPLAY_SET_CURSOR(1, 4);
	DISPLAY_SET_INCREMENT;

	switch (err_code) {
	case HAL_OK:
		break;
	case HAL_ERROR:
		display_write_data_seq("HAL_ERROR");
		break;
	case HAL_BUSY:
		display_write_data_seq("HAL_BUSY");
		break;
	case HAL_TIMEOUT:
		display_write_data_seq("HAL_TIMEOUT");
		break;
	default:
		display_write_data_seq("WRONG ERROR");
		break;
	}
}

int DNI_show_celsius(void)
{
	DISPLAY_CLEAR;
	DISPLAY_SET_INCREMENT;

	display_write_data_seq("DNI Temperature");

	int value = DNI_read();

	if (value < 0) {
		print_error(-value);
		return 1;
	} else {
		int temp = DNI_convert_to_celsius(value);
		DNI_print_celsius(temp);

		print_ok();

		return 0;
	}
}