[RISC-V MCU CH32V103 Review] Hardware IIC drive OLED (finally)

hzz592788

[RISC-V MCU CH32V103 Review] Hardware IIC drive OLED (finally) [Copy link]

I just rewrote the program and was too lazy to modify it. But suddenly it works

This makes me even more confused. I don't understand why it works. It's the same code.

IIC initialization part

void IIC_Init( u32 bound, u16 address )
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitTSturcture;

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C2, ENABLE );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOB, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOB, &GPIO_InitStructure );

    I2C_InitTSturcture.I2C_ClockSpeed = bound;
    I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
    I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitTSturcture.I2C_OwnAddress1 = address;
    I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
    I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_Init( I2C2, &I2C_InitTSturcture );

    I2C_Cmd( I2C2, ENABLE );

    I2C_AcknowledgeConfig( I2C2, ENABLE );
}

Instruction and data transfer section

/**********************************************
// IIC Write Command
**********************************************/
void Write_IIC_Command(unsigned char IIC_Command)
{
    while( I2C_GetFlagStatus( I2C2, I2C_FLAG_BUSY ) != RESET );
    I2C_GenerateSTART( I2C2, ENABLE );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_MODE_SELECT ) );
    I2C_Send7bitAddress( I2C2, WriteAddr, I2C_Direction_Transmitter );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );

    I2C_SendData( I2C2, (u8)(0x00&0x00FF) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

    if( I2C_GetFlagStatus( I2C2, I2C_FLAG_TXE ) !=  RESET )
    {
        I2C_SendData( I2C2, IIC_Command );
    }

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
    I2C_GenerateSTOP( I2C2, ENABLE );

}

/**********************************************
// IIC Write Data
**********************************************/
void Write_IIC_Data(unsigned char IIC_Data)
{
    while( I2C_GetFlagStatus( I2C2, I2C_FLAG_BUSY ) != RESET );
    I2C_GenerateSTART( I2C2, ENABLE );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_MODE_SELECT ) );
    I2C_Send7bitAddress( I2C2, WriteAddr, I2C_Direction_Transmitter );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );

    I2C_SendData( I2C2, (u8)(0x40&0x00FF) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

    if( I2C_GetFlagStatus( I2C2, I2C_FLAG_TXE ) !=  RESET )
    {
        I2C_SendData( I2C2, IIC_Data );
    }

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
    I2C_GenerateSTOP( I2C2, ENABLE );

}
void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
    if(cmd)
            {

   Write_IIC_Data(dat);

        }
    else {
   Write_IIC_Command(dat);

    }


}

OLED initialization part

void OLED_Init(void)
{
    IIC_Init( 400000, 0xA0);
    Delay_Ms(800);
    OLED_WR_Byte(0xAE,OLED_CMD);//--display off
    OLED_WR_Byte(0x00,OLED_CMD);//---set low column address
    OLED_WR_Byte(0x10,OLED_CMD);//---set high column address
    OLED_WR_Byte(0x40,OLED_CMD);//--set start line address
    OLED_WR_Byte(0xB0,OLED_CMD);//--set page address
    OLED_WR_Byte(0x81,OLED_CMD); // contract control
    OLED_WR_Byte(0xFF,OLED_CMD);//--128
    OLED_WR_Byte(0xA1,OLED_CMD);//set segment remap
    OLED_WR_Byte(0xA6,OLED_CMD);//--normal / reverse
    OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
    OLED_WR_Byte(0x3F,OLED_CMD);//--1/32 duty
    OLED_WR_Byte(0xC8,OLED_CMD);//Com scan direction
    OLED_WR_Byte(0xD3,OLED_CMD);//-set display offset
    OLED_WR_Byte(0x00,OLED_CMD);//
    OLED_WR_Byte(0xD5,OLED_CMD);//set osc division
    OLED_WR_Byte(0x80,OLED_CMD);//
    OLED_WR_Byte(0xD8,OLED_CMD);//set area color mode off
    OLED_WR_Byte(0x05,OLED_CMD);//
    OLED_WR_Byte(0xD9,OLED_CMD);//Set Pre-Charge Period
    OLED_WR_Byte(0xF1,OLED_CMD);//
    OLED_WR_Byte(0xDA,OLED_CMD);//set com pin configuartion
    OLED_WR_Byte(0x12,OLED_CMD);//
    OLED_WR_Byte(0xDB,OLED_CMD);//set Vcomh
    OLED_WR_Byte(0x30,OLED_CMD);//
    OLED_WR_Byte(0x8D,OLED_CMD);//set charge pump enable
    OLED_WR_Byte(0x14,OLED_CMD);//
    OLED_WR_Byte(0xAF,OLED_CMD);//--turn on oled panel
}

main function


#include "debug.h"
#include "oled.h"
#include "bmp.h"
/**********************************************************************


/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Return         : None
*******************************************************************************/
int main(void)
{
    u8 t;
	Delay_Init();
	USART_Printf_Init(115200);
	printf("SystemClk:%d\r\n",SystemCoreClock);

    OLED_Init();            //初始化OLED
    OLED_Clear()    ;

    t=' ';
    OLED_ShowCHinese(0,0,0);//中
    OLED_ShowCHinese(18,0,1);//景
    OLED_ShowCHinese(36,0,2);//园
    OLED_ShowCHinese(54,0,3);//电
    OLED_ShowCHinese(72,0,4);//子
    OLED_ShowCHinese(90,0,5);//科
    OLED_ShowCHinese(108,0,6);//技
    OLED_Clear();
    Delay_Ms(2000);
    OLED_ShowCHinese(0,0,0);//中
    OLED_ShowCHinese(18,0,1);//景
    OLED_ShowCHinese(36,0,2);//园
    OLED_ShowCHinese(54,0,3);//电
    OLED_ShowCHinese(72,0,4);//子
    OLED_ShowCHinese(90,0,5);//科
    OLED_ShowCHinese(108,0,6);//技
    Delay_Ms(2000);
    while(1)
  {
        OLED_Clear();
         OLED_ShowCHinese(0,0,0);//中
         OLED_ShowCHinese(18,0,1);//景
         OLED_ShowCHinese(36,0,2);//园
         OLED_ShowCHinese(54,0,3);//电
         OLED_ShowCHinese(72,0,4);//子
         OLED_ShowCHinese(90,0,5);//科
         OLED_ShowCHinese(108,0,6);//技
         OLED_ShowString(6,3,"0.96' OLED TEST",16);
         //OLED_ShowString(8,2,"ZHONGJINGYUAN");
      // OLED_ShowString(20,4,"2014/05/01");
         OLED_ShowString(0,6,"ASCII:",16);
         OLED_ShowString(63,6,"CODE:",16);
         OLED_ShowChar(48,6,t,16);//显示ASCII字符
         t++;
         if(t>'~')t=' ';
         OLED_ShowNum(103,6,t,3,16);//显示ASCII字符的码值
         Delay_Ms(2000);
         OLED_DrawBMP(0,0,128,8,BMP1);  //图片显示(图片显示慎用，生成的字表较大，会占用较多空间，FLASH空间8K以下慎用)
         Delay_Ms(2000);
  }

}

I2C_OLED.rar (403.85 KB, downloads: 19)

The source code is here. Next, I went back to SPI.