[ARM] I2C 통신을 이용한 DS3231 RTC(Real Time Clock) 구현

I2C를 이용해서 DS3231으로 부터 시간값을 얻자, 

얻은 값을 OLED에 송출하기 (이건 SPI)

/*
 * ds3231.c
 *
 *  Created on: Mar 22, 2021
 *      Author: kccistc
 */


#include "ds3231.h"

I2C_HandleTypeDef *hi2c;

void DS3231_Init(I2C_HandleTypeDef *I2C_Handler)
{
	hi2c = I2C_Handler;
}

void I2C_Transmit(uint8_t devAddr, uint8_t memAddr, uint8_t *pData, uint16_t Size )
{
	HAL_I2C_Mem_Write(hi2c, (devAddr<<1), memAddr, 1, pData ,Size, 100);

}

void I2C_Receive(uint8_t devAddr, uint8_t memAddr, uint8_t *pData, uint16_t Size)
{
	HAL_I2C_Mem_Read(hi2c, (devAddr<<1), memAddr, 1, pData ,Size, 100);
}

uint8_t DECtoBCD(uint8_t dec)
{
	return (((dec/10)<<4) | (dec%10));
}
uint8_t BCDtoDEC(uint8_t bcd)
{
	return (((bcd>>4)*10) + (bcd & 0x0f));
}


void DS3231_SetTime(DS3231_TIME sTime)
{
	uint8_t setTime[3];

	setTime[0] = DECtoBCD(sTime.sec);
	setTime[1] = DECtoBCD(sTime.min);
	setTime[2] = DECtoBCD(sTime.hour);

	I2C_Transmit(DS3231_ADDR, REG_ADDR_SEC, setTime, 3);
}

void DS3231_SetDate(DS3231_DATE sDate)
{
	uint8_t setDate[4];

	setDate[0] = DECtoBCD(sDate.day);  //DayOfWeek
	setDate[1] = DECtoBCD(sDate.date);
	setDate[2] = DECtoBCD(sDate.month);
	setDate[3] = DECtoBCD(sDate.year);

	I2C_Transmit(DS3231_ADDR, REG_ADDR_DAY, setDate, 4);
}

void DS3231_GetTime(DS3231_TIME *sTime)
{
	uint8_t getTime[3];


	I2C_Receive(DS3231_ADDR, REG_ADDR_SEC, getTime, 3);


	sTime -> sec = BCDtoDEC(getTime[0]);
	sTime -> min = BCDtoDEC(getTime[1]);
	sTime -> hour = BCDtoDEC(getTime[2]);
}

void DS3231_GetDate(DS3231_DATE *sDate)
{
	uint8_t getDate[4];


	I2C_Receive(DS3231_ADDR, REG_ADDR_DAY, getDate, 4);


	sDate -> day = BCDtoDEC(getDate[0]);
	sDate -> date = BCDtoDEC(getDate[1]);
	sDate -> month = BCDtoDEC(getDate[2]);
	sDate -> year = BCDtoDEC(getDate[3]);}



void DS3231_SetUartDateTime(uint8_t uartRxData)
{
	static uint8_t uartRxBuff[50] = {0,};
	//uint8_t uart2RxData;
	static uint8_t tail=0;
	int dateNum = 0, timeNum = 0;

	if (uartRxData == ';')
	{
		uartRxBuff[tail] = 0;
		tail = 0;
		//int strncmp(const char* str1, const char* str2, size_t n);
		if (strncmp("SETDATE", &uartRxBuff[0], 7) == 0)
		{
			DS3231_DATE tempDate;
			//SETDATE20210322;
			dateNum = atoi( &uartRxBuff[9]);
			//dateFlag = 1;
			tempDate.year = dateNum / 10000;
			tempDate.month = dateNum / 100 % 100;
			tempDate.date = dateNum % 100;
			DS3231_SetDate(tempDate);
			//dateFlag = 0;
		}
		else if (strncmp("SETTIME", &uartRxBuff[0], 7) == 0)
		{
			DS3231_TIME tempTime;
			//SETTIME142030;
			timeNum = atoi( &uartRxBuff[7]);
			//timeFlag = 1;
			tempTime.hour = timeNum / 10000;
			tempTime.min = timeNum / 100 % 100;
			tempTime.sec = timeNum % 100;
			DS3231_SetTime(tempTime);
			//timeFlag = 0;
		}
	}
	else
	{
		uartRxBuff[tail] = uartRxData;
		tail++;
	}
}

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
 * All rights reserved.</center></h2>
 *
 * This software component is licensed by ST under BSD 3-Clause license,
 * the "License"; You may not use this file except in compliance with the
 * License. You may obtain a copy of the License at:
 *                        opensource.org/licenses/BSD-3-Clause
 *
 ******************************************************************************
 */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
#include <strings.h>
#include "../dev/ds3231.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
int __io_putchar(int ch)
{
	HAL_UART_Transmit(&huart2, &ch, 1, 100);
	return ch;
}

uint8_t uart2RxData;

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	if (huart->Instance == USART2)
	{
		DS3231_SetUartDateTime(uart2RxData);
		HAL_UART_Receive_IT(&huart2, &uart2RxData, 1);
	}
}
/* USER CODE END 0 */

/**
 * @brief  The application entry point.
 * @retval int
 */
int main(void)
{
	/* USER CODE BEGIN 1 */

	/* USER CODE END 1 */

	/* MCU Configuration--------------------------------------------------------*/

	/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
	HAL_Init();

	/* USER CODE BEGIN Init */

	/* USER CODE END Init */

	/* Configure the system clock */
	SystemClock_Config();

	/* USER CODE BEGIN SysInit */

	/* USER CODE END SysInit */

	/* Initialize all configured peripherals */
	MX_GPIO_Init();
	MX_I2C1_Init();
	MX_USART2_UART_Init();
	/* USER CODE BEGIN 2 */
	DS3231_Init(&hi2c1);
	HAL_UART_Receive_IT(&huart2, &uart2RxData, 1);

	DS3231_TIME myTime;
	DS3231_DATE myDate;
	/* USER CODE END 2 */

	/* Infinite loop */
	/* USER CODE BEGIN WHILE */

	printf("Hello stm32\n");

	myDate.year = 20;
	myDate.month = 1;
	myDate.date = 20;
	myDate.day = 2;

	myTime.hour = 01;
	myTime.min = 10;
	myTime.sec = 30;

	DS3231_SetDate(myDate);
	DS3231_SetTime(myTime);

	while (1)
	{

		DS3231_GetDate(&myDate);
		DS3231_GetTime(&myTime);
		printf("20%02d-%02d-%02d %02d:%02d:%02d\n",
				myDate.year, myDate.month, myDate.date,
				myTime.hour, myTime.min, myTime.sec);

		HAL_Delay(1000);
		/* USER CODE END WHILE */

		/* USER CODE BEGIN 3 */
	}
	/* USER CODE END 3 */
}

/**
 * @brief System Clock Configuration
 * @retval None
 */
void SystemClock_Config(void)
{
	RCC_OscInitTypeDef RCC_OscInitStruct = {0};
	RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

	/** Configure the main internal regulator output voltage
	 */
	__HAL_RCC_PWR_CLK_ENABLE();
	__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
	/** Initializes the RCC Oscillators according to the specified parameters
	 * in the RCC_OscInitTypeDef structure.
	 */
	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
	RCC_OscInitStruct.HSEState = RCC_HSE_ON;
	RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
	RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
	RCC_OscInitStruct.PLL.PLLM = 4;
	RCC_OscInitStruct.PLL.PLLN = 100;
	RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
	RCC_OscInitStruct.PLL.PLLQ = 4;
	if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
	{
		Error_Handler();
	}
	/** Initializes the CPU, AHB and APB buses clocks
	 */
	RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
			|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
	RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
	RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
	RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
	RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

	if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
	{
		Error_Handler();
	}
}

/**
 * @brief I2C1 Initialization Function
 * @param None
 * @retval None
 */
static void MX_I2C1_Init(void)
{

	/* USER CODE BEGIN I2C1_Init 0 */

	/* USER CODE END I2C1_Init 0 */

	/* USER CODE BEGIN I2C1_Init 1 */

	/* USER CODE END I2C1_Init 1 */
	hi2c1.Instance = I2C1;
	hi2c1.Init.ClockSpeed = 100000;
	hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
	hi2c1.Init.OwnAddress1 = 0;
	hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
	hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
	hi2c1.Init.OwnAddress2 = 0;
	hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
	hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
	if (HAL_I2C_Init(&hi2c1) != HAL_OK)
	{
		Error_Handler();
	}
	/* USER CODE BEGIN I2C1_Init 2 */

	/* USER CODE END I2C1_Init 2 */

}

/**
 * @brief USART2 Initialization Function
 * @param None
 * @retval None
 */
static void MX_USART2_UART_Init(void)
{

	/* USER CODE BEGIN USART2_Init 0 */

	/* USER CODE END USART2_Init 0 */

	/* USER CODE BEGIN USART2_Init 1 */

	/* USER CODE END USART2_Init 1 */
	huart2.Instance = USART2;
	huart2.Init.BaudRate = 115200;
	huart2.Init.WordLength = UART_WORDLENGTH_8B;
	huart2.Init.StopBits = UART_STOPBITS_1;
	huart2.Init.Parity = UART_PARITY_NONE;
	huart2.Init.Mode = UART_MODE_TX_RX;
	huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
	huart2.Init.OverSampling = UART_OVERSAMPLING_16;
	if (HAL_UART_Init(&huart2) != HAL_OK)
	{
		Error_Handler();
	}
	/* USER CODE BEGIN USART2_Init 2 */

	/* USER CODE END USART2_Init 2 */

}

/**
 * @brief GPIO Initialization Function
 * @param None
 * @retval None
 */
static void MX_GPIO_Init(void)
{

	/* GPIO Ports Clock Enable */
	__HAL_RCC_GPIOH_CLK_ENABLE();
	__HAL_RCC_GPIOA_CLK_ENABLE();
	__HAL_RCC_GPIOB_CLK_ENABLE();

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
 * @brief  This function is executed in case of error occurrence.
 * @retval None
 */
void Error_Handler(void)
{
	/* USER CODE BEGIN Error_Handler_Debug */
	/* User can add his own implementation to report the HAL error return state */
	__disable_irq();
	while (1)
	{
	}
	/* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
 * @brief  Reports the name of the source file and the source line number
 *         where the assert_param error has occurred.
 * @param  file: pointer to the source file name
 * @param  line: assert_param error line source number
 * @retval None
 */
void assert_failed(uint8_t *file, uint32_t line)
{
	/* USER CODE BEGIN 6 */
	/* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
	/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/