【极海APM32M3514电机通用评估板】 硬件I2C驱动OLED显示屏

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【极海APM32M3514电机通用评估板】 硬件I2C驱动OLED显示屏 [复制链接]

 

测试APM32M3514板卡硬件I2C方式驱动OLED显示屏。

 

一、硬件部分

测试使用PB8和PB9端口

需要将上面的电阻去掉，将PB8和PB9分别连接OLED显示的SCL和SDA引脚，PB8和PB9引脚服复用功能如下表。

 

 

二、程序部分

 

2.1、i2c.c

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#include "main.h"

/* Waiting TIMEOUT */
#define I2CT_FLAG_TIMEOUT           ((uint32_t)0x1000)
#define I2CT_LONG_TIMEOUT           ((uint32_t)(10 * I2CT_FLAG_TIMEOUT))
/*Debug Information output*/
#define I2C_DEBUG_ON                1
#define I2C_ERROR(fmt,arg...)       printf("<<-Master-I2C_ERROR->> "fmt"\n",##arg)

static volatile uint32_t I2CTimeout = I2CT_LONG_TIMEOUT;


void init_i2c(void)
{
	GPIO_Config_T gpioConfigStruct;
	I2C_Config_T i2cConfigStruct;

	/* Enable I2C related Clock */
	RCM_EnableAHBPeriphClock(RCM_AHB_PERIPH_GPIOB);
	RCM_EnableAPB1PeriphClock(RCM_APB1_PERIPH_I2C);
	RCM_EnableAPB2PeriphClock(RCM_APB2_PERIPH_SYSCFG);


	/* Free I2C_SCL and I2C_SDA */
	gpioConfigStruct.mode = GPIO_MODE_OUT;
	gpioConfigStruct.speed = GPIO_SPEED_50MHz;
	gpioConfigStruct.outtype = GPIO_OUT_TYPE_PP;
	gpioConfigStruct.pupd = GPIO_PUPD_NO;
	gpioConfigStruct.pin = GPIO_PIN_8;
	GPIO_Config(GPIOB, &gpioConfigStruct);

	gpioConfigStruct.pin = GPIO_PIN_9;
	GPIO_Config(GPIOB, &gpioConfigStruct);

	GPIO_SetBit(GPIOB, GPIO_PIN_8);
	GPIO_SetBit(GPIOB, GPIO_PIN_9);

	/* Connect I2C to SCL */
	GPIO_ConfigPinAF(GPIOB, GPIO_PIN_SOURCE_8, GPIO_AF_PIN1);
	/* Connect I2C to SDA */
	GPIO_ConfigPinAF(GPIOB, GPIO_PIN_SOURCE_9, GPIO_AF_PIN1);
	/*  Config I2C GPIO */
	gpioConfigStruct.mode = GPIO_MODE_AF;
	gpioConfigStruct.speed = GPIO_SPEED_50MHz;
	gpioConfigStruct.outtype = GPIO_OUT_TYPE_OD;
	gpioConfigStruct.pupd = GPIO_PUPD_NO;
	gpioConfigStruct.pin = GPIO_PIN_8;
	GPIO_Config(GPIOB, &gpioConfigStruct);

	gpioConfigStruct.pin = GPIO_PIN_9;
	GPIO_Config(GPIOB, &gpioConfigStruct);

	/*  Config I2C */
	I2C_Reset();
	RCM_ConfigI2CCLK(RCM_I2CCLK_SYSCLK);
	i2cConfigStruct.ack = I2C_ACK_ENABLE;
	i2cConfigStruct.ackaddress = I2C_ACK_ADDRESS_7BIT;
	i2cConfigStruct.address1 = 0x30;
	i2cConfigStruct.analogfilter = I2C_ANALOG_FILTER_ENABLE;
	i2cConfigStruct.digitalfilter = I2C_DIGITAL_FILTER_0;
	i2cConfigStruct.mode = I2C_MODE_I2C;
	i2cConfigStruct.timing = 0x1042F013;
	I2C_Config(&i2cConfigStruct);

	/* Enable the I2C Interrupt */
	I2C_EnableInterrupt(I2C_INT_RXIE | I2C_INT_ADDRIE | I2C_INT_STOPIE);

	/* NVIC configuration */
	NVIC_EnableIRQRequest(I2C_IRQn, 1);

	/* slave configuration*/
	I2C_EnableSlaveByteControl();
	I2C_EnableReload();
	I2C_EnableStretchClock();

	/* Enable I2C */
	I2C_Enable();
}

void I2C_Isr(void)
{
    uint8_t dat;

    if (I2C_ReadIntFlag(I2C_INT_FLAG_ADDR) == SET)
    {
        I2C_ConfigNumberOfBytes(1);
        I2C_ClearIntFlag(I2C_INT_FLAG_ADDR);
    }

    if (I2C_ReadStatusFlag(I2C_FLAG_RXBNE) == SET)
    {
        /* I2C_ConfigNumberOfBytes is necessary*/
        I2C_ConfigNumberOfBytes(1);
        dat = (uint8_t)I2C_RxData();
        printf("%c", dat);
    }

    if (I2C_ReadIntFlag(I2C_INT_FLAG_STOP) == SET)
    {
        I2C_ClearIntFlag(I2C_INT_FLAG_STOP);
    }
}

uint32_t I2C_TIMEOUT_UserCallback(uint8_t errorCode)
{
    if (I2C_DEBUG_ON)
    {
        I2C_ERROR("I2C Wait TIMEOUT! errorCode = %d\r\n", errorCode);
    }

    return 0;
}

uint32_t I2C_WriteDat(uint8_t DevAddr, uint8_t* pBuffer, uint8_t NByte)
{
	uint8_t wNum; 
	I2CTimeout = I2CT_LONG_TIMEOUT;

	/* Wait until I2C is idle */
	while (I2C_ReadStatusFlag(I2C_FLAG_BUSY) == SET)
	{
			init_i2c();
			if ((I2CTimeout--) == 0)
			{
					return I2C_TIMEOUT_UserCallback(1);
			}
	}

	/* Disable I2C interrupt  */
	I2C_DisableInterrupt(I2C_INT_RXIE | I2C_INT_ADDRIE | I2C_INT_STOPIE);
	I2C_DisableReload();
	/* I2C Send Configuration*/
	I2C_HandlingTransfer(DevAddr, NByte, I2C_RELOAD_MODE_AUTOEND, I2C_GENERATE_START_WRITE);
	
	for(wNum = 0;wNum < NByte;wNum++)
	{
		I2C_TxData(pBuffer[wNum]);
		I2CTimeout = I2CT_LONG_TIMEOUT;

		while (I2C_ReadStatusFlag(I2C_FLAG_TXBE) == RESET)
		{
			if ((I2CTimeout--) == 0)
			{
					return I2C_TIMEOUT_UserCallback(2);
			}
		}
	}

	/* I2C Generate Stop signal */
	I2C_EnableGenerateStop();

	I2CTimeout = I2CT_LONG_TIMEOUT;
	while (I2C_ReadStatusFlag(I2C_FLAG_STOP) == RESET)
	{
		if ((I2CTimeout--) == 0)
		{
				return I2C_TIMEOUT_UserCallback(3);
		}
	}

	/* I2C Clear Stop Flag */
	I2C_ClearIntFlag(I2C_INT_FLAG_STOP);
  return 0;
}

 

2.2、i2c.h

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#ifndef _I2C_H
#define _I2C_H

void init_i2c(void);
void I2C_Isr(void);
uint32_t I2C_WriteDat(uint8_t DevAddr, uint8_t* pBuffer, uint8_t NByte);

#endif

 

2.3、oled.c

使用的OLED显示屏驱动芯片是SSD1306

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#include "main.h"
#include "oled/codetab.h"
#include "i2c/i2c.h"

void oled_WriteByte(uint8_t addr, uint8_t dat)
{				  	  	    																 
  i2c_Start();  
	i2c_SendByte(0x78);	   
	i2c_WaitAck(); 
  i2c_SendByte(addr);  
	i2c_WaitAck();	     	   
	i2c_SendByte(dat);       	   
	i2c_WaitAck();	 	   
  i2c_Stop(); 
}

void I2C_WriteByte(uint8_t addr, uint8_t dat)
{
  uint8_t temp[2];
  temp[0] = addr;
	temp[1] = dat;
	I2C_WriteDat(0x78, temp, 2);
}


void WriteCmd(unsigned char I2C_Command)
{
    I2C_WriteByte(0x00, I2C_Command);
}

void WriteDat(unsigned char I2C_Data) 
{
    I2C_WriteByte(0x40, I2C_Data);
}

void OLED_WrCmd(unsigned char IIC_Command)
{
	WriteCmd(IIC_Command);
}

void OLED_Init(void)
{
	//i2c_CfgGpio();
	APM_DelayMs(100);
	WriteCmd(0xAE); //display off
	WriteCmd(0x20);	//Set Memory Addressing Mode	
	WriteCmd(0x10);	//00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode (RESET);11,Invalid
	WriteCmd(0xb0);	//Set Page Start Address for Page Addressing Mode,0-7
	WriteCmd(0xc8);	//Set COM Output Scan Direction
	WriteCmd(0x00); //---set low column address
	WriteCmd(0x10); //---set high column address
	WriteCmd(0x40); //--set start line address
	WriteCmd(0x81); //--set contrast control register
	WriteCmd(0xff); //亮度调节 0x00~0xff
	WriteCmd(0xa1); //--set segment re-map 0 to 127
	WriteCmd(0xa6); //--set normal display
	WriteCmd(0xa8); //--set multiplex ratio(1 to 64)
	WriteCmd(0x3F); //
	WriteCmd(0xa4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
	WriteCmd(0xd3); //-set display offset
	WriteCmd(0x00); //-not offset
	WriteCmd(0xd5); //--set display clock divide ratio/oscillator frequency
	WriteCmd(0xf0); //--set divide ratio
	WriteCmd(0xd9); //--set pre-charge period
	WriteCmd(0x22); //
	WriteCmd(0xda); //--set com pins hardware configuration
	WriteCmd(0x12);
	WriteCmd(0xdb); //--set vcomh
	WriteCmd(0x40); //0x20,0.77xVcc
	WriteCmd(0x8d); //--set DC-DC enable
	WriteCmd(0x14); //
	WriteCmd(0xaf); //--turn on oled panel
}

void OLED_SetPos(unsigned char x, unsigned char y) 
{ 
	WriteCmd(0xb0+y);
	WriteCmd(((x&0xf0)>>4)|0x10);
	WriteCmd((x&0x0f)|0x01);
}

void OLED_Fill(unsigned char fill_Data)//全屏填充
{
	unsigned char m,n;
	for(m=0;m<8;m++)
	{
		WriteCmd(0xb0+m);		//page0-page1
		WriteCmd(0x00);		//low column start address
		WriteCmd(0x10);		//high column start address
		for(n=0;n<128;n++)
			{
				WriteDat(fill_Data);
			}
	}
}

void OLED_CLS(void)//清屏
{
	OLED_Fill(0xff);
}

void OLED_ON(void)
{
	WriteCmd(0X8D);  //设置电荷泵
	WriteCmd(0X14);  //开启电荷泵
	WriteCmd(0XAF);  //OLED唤醒
}

void OLED_OFF(void)
{
	WriteCmd(0X8D);  //设置电荷泵
	WriteCmd(0X10);  //关闭电荷泵
	WriteCmd(0XAE);  //OLED休眠
}

void OLED_ShowStr(unsigned char x, unsigned char y, unsigned char ch[], unsigned char TextSize)
{
	unsigned char c = 0,i = 0,j = 0;
	switch(TextSize)
	{
		case 1:
		{
			while(ch[j] != '\0')
			{
				c = ch[j] - 32;
				if(x > 126)
				{
					x = 0;
					y++;
				}
				OLED_SetPos(x,y);
				for(i=0;i<6;i++)
					WriteDat(F6x8[c][i]);
				x += 6;
				j++;
			}
		}break;
		case 2:
		{
			while(ch[j] != '\0')
			{
				c = ch[j] - 32;
				if(x > 120)
				{
					x = 0;
					y++;
				}
				OLED_SetPos(x,y);
				for(i=0;i<8;i++)
					WriteDat(F8X16[c*16+i]);
				OLED_SetPos(x,y+1);
				for(i=0;i<8;i++)
					WriteDat(F8X16[c*16+i+8]);
				x += 8;
				j++;
			}
		}break;
	}
}

void OLED_ShowCN(unsigned char x, unsigned char y, unsigned char N)
{
	unsigned char wm=0;
	unsigned int  adder=32*N;
	OLED_SetPos(x , y);
	for(wm = 0;wm < 16;wm++)
	{
		WriteDat(F16x16[adder]);
		adder += 1;
	}
	OLED_SetPos(x,y + 1);
	for(wm = 0;wm < 16;wm++)
	{
		WriteDat(F16x16[adder]);
		adder += 1;
	}
}

void OLED_DrawBMP(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char BMP[])
{
	unsigned int j=0;
	unsigned char x,y;

  if(y1%8==0)
		y = y1/8;
  else
		y = y1/8 + 1;
	for(y=y0;y<y1;y++)
	{
		OLED_SetPos(x0,y);
    for(x=x0;x<x1;x++)
		{
			WriteDat(BMP[j++]);
		}
	}
}

void oled_test(void)
{
	OLED_Init();
	OLED_Fill(0x00);
	OLED_ShowStr(0,0,"APM32M3514 BOARD",2);
	OLED_ShowStr(0,2,"I2C OLED TEST",2);	
}

 

2.4、main.c

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int main(void)
{
	APM_DelayInit();
	APM_DelayMs(5000);
	
	init_usart();
	init_led();
	init_i2c();
	OLED_Init();
	oled_test();

	while (1)
	{
		led_on();
		APM_DelayMs(200);
		led_off();
		APM_DelayMs(200);
	}
}

 

三、运行结果

 

下载程序后，OLED显示屏显示

 

lyafei428

看着不错，准备试一下