LoginSignup
1
6

More than 3 years have passed since last update.

@usashirou

STM32CubeIDEを使ってみよう How To STM32CubeIDE 日本語版 (11) I2Cを使ってみよう4 Si7020+ssd1306編

Last updated at Posted at 2019-10-05

STM32CubeIDEを使ってみよう How To STM32CubeIDE 日本語版 (10) I2Cを使ってみよう3 ssd1306編の続きです。
https://qiita.com/usashirou/items/e1e7265e38f011c89947

NucleoボードとSi7020、SSD1306を接続します。
今回は、ブレッドボードも用意してください。
ジャンパーワイヤーは、オス⇔オスを10本用意します。（8本でもＯＫ）

image.png

新しいプロジェクトを立ち上げるか、Si7020のプロジェクトを使用しましょう。
最初にSTM32CubeIDEを使ってみよう How To STM32CubeIDE 日本語版 (9) I2Cを使ってみよう2 si7020編の内容を行います。
https://qiita.com/usashirou/items/f59b4b82d7d4086b8936

次に、ssd1306の
- font.h
- font.c
- ssd1306.h
- ssd1306.c
をコピーします。

STM32CubeIDEを使ってみよう How To STM32CubeIDE 日本語版 (10) I2Cを使ってみよう3 ssd1306編を見てね
https://qiita.com/usashirou/items/e1e7265e38f011c89947

次に、画面に表示する内容を作っていきます。
59行目あたりに

uint8_t ohum[12];
uint8_t otemp[12];

を追加します。

165行目に

//    ssd1306_Fill(White);
//    ssd1306_UpdateScreen();
        sprintf((char*)ohum,"%u.%u RH",
        ((unsigned int)humidity / 10),
        ((unsigned int)humidity % 10));
        sprintf((char*)otemp,"%u.%u C",
        ((unsigned int)temp / 10),
        ((unsigned int)temp % 10));

      ssd1306_SetCursor(23,20);
      ssd1306_WriteString(ohum,Font_11x18,Black);
      ssd1306_SetCursor(23,40);
      ssd1306_WriteString(otemp,Font_11x18,Black);
      ssd1306_UpdateScreen();

を追加します。
最初のssd1306_Fill(White);
は、最初に映した文字を消去するプログラムです。
今回、I2C Sensorの文字位置を変更したので消去しないようにしています。

次に、humとtempを書き込みます。
ただし、改行コードが、文字化けするので改行コードがないプログラムを記述しています。
このためにohum、otempの2つを追加しています。

以下はフルプログラムです

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2019 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 <string.h>
#include <stdio.h>
/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#include "ssd1306.h"
#include "fonts.h"
/* 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 */
static const u_int8_t si7020_ADDR = 0x40<< 1;
static const u_int8_t REG_HUM = 0xF5 ;
static const u_int8_t REG_TEMP = 0xF3 ;
uint8_t reg[12];
char tmp[2];
float humidity;
uint8_t hum[12];
uint8_t ohum[12];
uint8_t otemp[12];
float temp;
uint8_t utemp[12];

/* USER CODE END PV */

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

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* Direct printf to output somewhere */
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */

#ifndef __UUID_H
#define __UUID_H
//#define STM32_UUID ((uint32_t *)0x1FF0F420)
#define STM32_UUID ((uint32_t *)UID_BASE)
#endif //__UUID_H

/* 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_USART2_UART_Init();
  MX_I2C1_Init();
  /* USER CODE BEGIN 2 */
    printf("I2C Sensor\r\n");
      ssd1306_Init();
      HAL_Delay(1000);
      ssd1306_Fill(White);
      ssd1306_UpdateScreen();

      HAL_Delay(1000);

      ssd1306_SetCursor(10,0);
      ssd1306_WriteString("I2C Sensor",Font_11x18,Black);

      ssd1306_UpdateScreen();
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
      reg[0] = REG_HUM;
      HAL_I2C_Master_Transmit(&hi2c1, si7020_ADDR,reg,1, 1000);
      HAL_Delay(500);
      HAL_I2C_Master_Receive(&hi2c1, si7020_ADDR,tmp,2,1000 );
      humidity = ((((tmp[0] * 256 + tmp[1]) * 125.0) / 65536.0) - 6)*10;
        sprintf((char*)hum,"%u.%u RH\r\n",
        ((unsigned int)humidity / 10),
        ((unsigned int)humidity % 10));
        printf(hum);
      HAL_Delay(500);

      reg[0] = REG_TEMP;
      HAL_I2C_Master_Transmit(&hi2c1, si7020_ADDR,reg,1, 1000);
      HAL_Delay(500);
      HAL_I2C_Master_Receive(&hi2c1, si7020_ADDR,tmp,2,1000 );
      temp = ((((tmp[0] * 256 + tmp[1]) * 175.72) / 65536.0) - 46.85)*10;
        sprintf((char*)utemp,"%u.%u C\r\n",
        ((unsigned int)temp / 10),
        ((unsigned int)temp % 10));
        printf(utemp);
      HAL_Delay(500);

//    ssd1306_Fill(White);
//    ssd1306_UpdateScreen();
        sprintf((char*)ohum,"%u.%u RH",
        ((unsigned int)humidity / 10),
        ((unsigned int)humidity % 10));
        sprintf((char*)otemp,"%u.%u C",
        ((unsigned int)temp / 10),
        ((unsigned int)temp % 10));

      ssd1306_SetCursor(23,20);
      ssd1306_WriteString(ohum,Font_11x18,Black);
      ssd1306_SetCursor(23,40);
      ssd1306_WriteString(otemp,Font_11x18,Black);
      ssd1306_UpdateScreen();

    /* 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_SCALE2);
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 16;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB busses 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_2) != 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_InitTypeDef GPIO_InitStruct = {0};

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

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : B1_Pin */
  GPIO_InitStruct.Pin = B1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : LD2_Pin */
  GPIO_InitStruct.Pin = LD2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */
/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval None
  */
PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART2 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, 0xFFFF);

  return ch;
}

/* 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 */

  /* 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,
     tex: 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****/

シリアル出力と、OLEDに同じデータが出力されます。

122-2.jpg

1
6
0

Register as a new user and use Qiita more conveniently

  1. You get articles that match your needs
  2. You can efficiently read back useful information
  3. You can use dark theme
What you can do with signing up
Sign upLogin
1
6