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Micro-controllers, wireless transmission and database

TCA9548A with Blue Pill using STM32CubeIDE

Prerequisites

This project assumes you have already installed STM32CubeIDE. You need to have previously done a basic blink sketch with blue-pill using STM32CubeIDE. I have made a complete video from installing STM32CubeIDE to LED blink program. You can watch it by clicking this link. https://www.youtube.com/watch?v=kXg467nVd_A

Wiring Diagram

STM32CubeIDE Settings

Click connectivity --> Click I2C2

For I2C select I2C

Configuration --> Parameter Settings

For I2C speed select Fast Mode

Libraries

Inside Core/Inc Folder

fonts.h ssd1306.h

Inside Core/Src Folder

fonts.c ssd1306.c

Additional code on top of STM32CubeIDE generated code

/* USER CODE BEGIN Includes */
#include "fonts.h"
#include "ssd1306.h"
/* USER CODE END Includes */

/* USER CODE BEGIN 0 */
void setTCAChannel(uint8_t i){
  uint8_t channel = 1 << i;
  HAL_I2C_Master_Transmit(&hi2c2, (0x70 << 1), &channel, 1, 1000);
}
/* USER CODE END 0 */

  /* USER CODE BEGIN 2 */
  char snum[5];

  setTCAChannel(2);
  SSD1306_Init();
  SSD1306_GotoXY (0,0);
  SSD1306_Puts ("TCA9548A", &Font_11x18, 1);
  SSD1306_GotoXY (0, 30);
  SSD1306_Puts ("Multiplexer", &Font_11x18, 1);
  SSD1306_UpdateScreen();

  setTCAChannel(3);
  SSD1306_Init();
  SSD1306_GotoXY (0,0);
  SSD1306_Puts ("STM32", &Font_11x18, 1);
  SSD1306_GotoXY (0, 30);
  SSD1306_Puts ("BluePill", &Font_11x18, 1);
  SSD1306_UpdateScreen();

  setTCAChannel(4);
  SSD1306_Init();
  SSD1306_GotoXY (0,0);
  SSD1306_Puts ("MicroPeta", &Font_11x18, 1);
  SSD1306_GotoXY (0, 30);
  SSD1306_Puts (".Com", &Font_11x18, 1);
  SSD1306_UpdateScreen();

  setTCAChannel(5);
  SSD1306_Init();
  SSD1306_GotoXY (0,0);
  SSD1306_Puts ("Nizar", &Font_11x18, 1);
  SSD1306_GotoXY (0, 30);
  SSD1306_Puts ("Mohideen", &Font_11x18, 1);
  SSD1306_UpdateScreen();
  HAL_Delay (5000);

  for ( int x = 1; x <= 10000 ; x++ )
  {
    setTCAChannel(2);
    itoa(x, snum, 10);
    SSD1306_Clear();
    SSD1306_GotoXY (0,0);
    SSD1306_Puts ("1 Time", &Font_11x18, 1);
    SSD1306_GotoXY (0, 30);
    SSD1306_Puts (snum, &Font_16x26, 1);
    SSD1306_UpdateScreen();

    setTCAChannel(3);
    itoa(x*2, snum, 10);
    SSD1306_Clear();
    SSD1306_GotoXY (0,0);
    SSD1306_Puts ("2 Times", &Font_11x18, 1);
    SSD1306_GotoXY (0, 30);
    SSD1306_Puts (snum, &Font_16x26, 1);
    SSD1306_UpdateScreen();

    setTCAChannel(4);
    itoa(x*3, snum, 10);
    SSD1306_Clear();
    SSD1306_GotoXY (0,0);
    SSD1306_Puts ("3 Times", &Font_11x18, 1);
    SSD1306_GotoXY (0, 30);
    SSD1306_Puts (snum, &Font_16x26, 1);
    SSD1306_UpdateScreen();

    setTCAChannel(5);
    itoa(x*4, snum, 10);
    SSD1306_Clear();
    SSD1306_GotoXY (0,0);
    SSD1306_Puts ("4 Times", &Font_11x18, 1);
    SSD1306_GotoXY (0, 30);
    SSD1306_Puts (snum, &Font_16x26, 1);
    SSD1306_UpdateScreen();

    HAL_Delay (500);
  }
  /* USER CODE END 2 */

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