STM32CubeIDE, hardware IIC, OLED, DS1302 clock, DHT11 temperature and humidity meter study notes

The code is as follows, if you have a strong reading ability, just look at the code, and it can be used after testing.

Link: https://pan.baidu.com/s/1IRkNfHerEdfChoULzhUsQw?pwd=8888 
Extraction code: 8888 
1. Hardware IIC

see configuration

Core code:

you are.c

HAL_StatusTypeDef OLED_WR_Byte(u8 dat,u8 mode)
{
	HAL_StatusTypeDef i;
    if(mode)
    {
    	i=HAL_I2C_Mem_Write(&hi2c1 ,0x78,0x40,I2C_MEMADD_SIZE_8BIT,&dat,1,0x100);
    }
    else
    {
    	i=HAL_I2C_Mem_Write(&hi2c1 ,0x78,0x00,I2C_MEMADD_SIZE_8BIT,&dat,1,0x100);
    }
    return i;

}

void OLED_Refresh(void)
{
	u8 i=0,n;
	for(i=0;i<8;i++)
	{
		OLED_WR_Byte(0xb0+i,OLED_CMD);
		OLED_WR_Byte(0x00,OLED_CMD);
		OLED_WR_Byte(0x10,OLED_CMD);
		for(n=0;n<128;n++)
		{
			OLED_WR_Byte(OLED_GRAM[n][i],OLED_DATA);

		}

	}
}

Other parts are the same as the software IIC.

2. DS1302 clock, DHT11 temperature and humidity

(It is relatively simple to see the source code)