【STM32】0.96寸OLED屏显示数据

本文介绍了如何使用STM32通过SPI接口与OLED显示屏交互,展示汉字点阵及姓名学号,并详细讲解了如何读取并显示AHT20温湿度传感器的数据。通过I2C协议,实现了温湿度数据的采集和屏幕显示。

一、SPI介绍(串行外设接口)

  SPI是串行外设接口(Serial Peripheral Interface)的缩写,SPI是一种高速、全双工、同步通信的通信总线,被广泛应用在ADC、LCD等与MCU的通信过程中,特点就是快。串行外围接口(SPI)总线是由摩托罗拉公司开发的,用于在主设备和从设备之间提供全双工同步串行通信。

二、使用OLED屏显示姓名学号

  1. 提取汉字点阵
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  2. 修改代码
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  3. 设置文字滚动

	OLED_WR_Byte(0x2E,OLED_CMD); //关闭滚动
	OLED_WR_Byte(0x27,OLED_CMD); //水平向左或者右滚动 26/27
	OLED_WR_Byte(0x00,OLED_CMD); //虚拟字节
	OLED_WR_Byte(0x00,OLED_CMD); //起始页 0
	OLED_WR_Byte(0x07,OLED_CMD); //滚动时间间隔
	OLED_WR_Byte(0x02,OLED_CMD); //终止页 2
	OLED_WR_Byte(0x00,OLED_CMD); //虚拟字节
	OLED_WR_Byte(0xFF,OLED_CMD); //虚拟字节
  1. 连线方式
    在这里插入图片描述

三、使用OLED屏显示AHT20的温度和湿度

具体细节参考:【STM32】基于IIC协议使用AHT20温湿度传感器进行数据采集

  1. 读取温湿度
//读取温湿度
void getData(){
	//AHT20_Read_CTdata(CT_data);       //不经过CRC校验,直接读取AHT20的温度和湿度数据    推荐每隔大于1S读一次
		AHT20_Read_CTdata(CT_data);;  //crc校验后,读取AHT20的温度和湿度数据 
		c1 = CT_data[0]*1000/1024/1024;  //计算得到湿度值c1(放大了10倍)
		t1 = CT_data[1]*2000/1024/1024-500;//计算得到温度值t1(放大了10倍)

		//转为字符串易于显示
		temp[0]=t1/100+'0';
		temp[1]=(t1/10)%10+'0';
		temp[2]='.';
		temp[3]=t1%10+'0';
		temp[4]='\0';
		
		hum[0]=c1/100+'0';
		hum[1]=(c1/10)%10+'0';
		hum[2]='.';
		hum[3]=c1%10+'0';
		hum[4]=32;
		hum[5]='%';
		hum[6]='\0';
}
  1. 显示温湿度:
//显示温湿度
void showData(){
		//显示温度
		GUI_ShowCHinese(15,28,16,"温度",1);
		GUI_ShowString(47,28,":",16,1);
		GUI_ShowString(62,28,temp,16,1);
		GUI_ShowCHinese(96,28,16,"℃",1);

		//显示湿度
		GUI_ShowCHinese(15,48,16,"湿度",1);
		GUI_ShowString(47,48,":",16,1);
		GUI_ShowString(62,48,hum,16,1);
}

四、编译运行

  1. 编译:
    在这里插入图片描述

  2. 烧录:
    在这里插入图片描述
    烧录完成

  3. 运行
    请添加图片描述
    请添加图片描述

五、总结

  本文通过学习I2C总线通信协议,并理解OLED屏显和汉字点阵编码原理,使用STM32F103的SPI接口实现OLED屏显示数据。

六、参考

https://blog.youkuaiyun.com/weixin_56102526/article/details/121481216?spm=1001.2014.3001.5501

Pin Number Symbol I/O Function P Po o we er r S Su up pp pl ly y 9 VDD P P Po o we er r S Su up pp pl ly y f fo or r L Lo og gi ic c This is a voltage supply pin. It must be connected to external source. 8 VSS P G Gr ro ou un nd d o of f L Lo og gi ic c C Ci ir rc cu ui it t This is a ground pin. It acts as a reference for the logic pins. It must be connected to external ground. 28 VCC P P Po o we er r S Su up pp pl ly y f fo or r OE EL L P Pa an ne el l This is the most positive voltage supply pin of the chip. A stabilization capacitor should be connected between this pin and V SS when the converter is used. It must be connected to external source when the converter is not used. 29 VLSS P G Gr ro ou un nd d o of f A An na al lo og g C Ci ir rc cu ui it t This is an analog ground pin. It should be connected to V SS externally. D Dr ri iv ve er r 26 IREF I C Cu ur rr re en nt t R Re ef fe er re en nc ce e f fo or r B Br ri ig gh ht tn ne es ss s A Ad dj ju us st t me en nt t This pin is segment current reference pin. A resistor should be connected between this pin and V SS . Set the current at 12.5μA maximum. 27 VCOMH O V Vo ol lt ta ag ge e Ou ut tp pu ut t Hi ig gh h L Le ev ve el l f fo or r C C O M S Si ig gn na al l This pin is the input pin for the voltage output high level for COM signals. A capacitor should be connected between this pin and V SS . D DC C/ /D DC C C Co on nv ve er rt te er r 6 VDDB P P Po o we er r S Su up pp pl ly y f fo or r DC C/ / DC C C Co on nv ve er rt te er r C Ci ir rc cu ui it t This is the power supply pin for the internal buffer of the DC/DC voltage converter. It must be connected to external source when the converter is used. It should be connected to V DD when the converter is not used. 4 / 5 2 / 3 C1P / C1N C2P / C2N I P Po os si it ti iv ve e T Te er r mi in na al l o of f t th he e F Fl ly yi in ng g I In nv ve er rt ti in ng g C Ca ap pa ac ci it to or r Ne eg ga at ti iv ve e T Te er r mi in na al l o of f t th he e F Fl ly yi in ng g B Bo oo os st t C Ca ap pa ac ci it to or r The charge-pump capacitors are required between the terminals. They must be floated when the converter is not used. I In nt te er rf fa ac ce e 10 11 12 BS0 BS1 BS2 I C Co o m mu un ni ic ca at ti in ng g P Pr ro ot to oc co ol l S Se el le ec ct t These pins are MCU interface selection input. See the following table: BS0 BS1 BS2 I 2 C 0 1 0 3-wire SPI 1 0 0 4-wire SPI 0 0 0 8-bit 68XX Parallel 0 0 1 8-bit 80XX Parallel 0 1 1 14 RES# I P Po o we er r R Re es se et t f fo or r C Co on nt tr ro ol ll le er r a an nd d Dr ri iv ve er r This pin is reset signal input. When the pin is low, initialization of the chip is executed. Keep this pin pull high during normal operation. 13 CS# I C Ch hi ip p S Se el le ec ct t This pin is the chip select input. The chip is enabled for MCU communication only when CS# is pulled low. 15 D/C# I Da at ta a/ /C Co o m ma an nd d C Co on nt tr ro ol l This pin is Data/Command control pin. When the pin is pulled high, the input at D7~D0 is treated as display data. When the pin is pulled low, the input at D7~D0 will be transferred to the command register. When the pin is pulled high and serial interface mode is selected, the data at SDIN will be interpreted as data. When it is pulled low, the data at SDIN will be transferred to the command register. In I 2 C mode, this pin acts as SA0 for slave address selection. For detail relationship to MCU interface signals, please refer to the Timing Characteristics Diagrams. 17 E/RD# I R Re ea ad d/ / Wr ri it te e E En na ab bl le e o or r R Re ea ad d This pin is MCU interface input. When interfacing to a 68XX-series microprocessor, this pin will be used as the Enable (E) signal. Read/write operation is initiated when this pin is pulled high and the CS# is pulled low. When connecting to an 80XX-microprocessor, this pin receives the Read (RD#) signal. Data read operation is initiated when this pin is pulled low and CS# is pulled low. When serial or I 2 C mode is selected, this pin must be connected to V SS . GoldenMorning Electronic 4 1.5 Pin Definition (Continued) Pin Number Symbol I/O Function I In nt te er rf fa ac ce e ( (C Co on nt ti in nu ue ed d) ) 16 R/W# I R Re ea ad d/ / Wr ri it te e S Se el le ec ct t o or r Wr ri it te e This pin is MCU interface input. When interfacing to a 68XX-series microprocessor, this pin will be used as Read/Write (R/W#) selection input. Pull this pin to “High” for read mode and pull it to “Low” for write mode. When 80XX interface mode is selected, this pin will be the Write (WR#) input. Data write operation is initiated when this pin is pulled low and the CS# is pulled low. When serial or I 2 C mode is selected, this pin must be connected to V SS . 18~25 D0~D7 I/O Ho os st t Da at ta a I In np pu ut t/ / Ou ut tp pu ut t B Bu us s These pins are 8-bit bi-directional data bus to be connected to the microprocessor’s data bus. When serial mode is selected, D1 will be the serial data input SDIN and D0 will be the serial clock input SCLK. When I 2 C mode is selected, D2 & D1 should be tired together and serve as SDA out & SDA in in application and D0 is the serial clock input SCL. Unused pins must be connected to V SS except for D2 in serial mode. R Re es se er rv ve e 7 N.C. - R Re es se er rv ve ed d P Pi in n The N.C. pin between function pins are reserved for compatible and flexible design. 1, 30 N.C. (GND) - R Re es se er rv ve ed d P Pi in n ( (S Su up pp po or rt ti in ng g P Pi in n) ) The supporting pins can reduce the influences from stresses on the function pins. These pins must be connected to external ground as the ESD protection circuit.
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