- 一、原理基础
- 1、IIC简介
- 2、软件IIC和硬件IIC
- 二、功能实现
- 1、STM32Cube配置
- 2、Keil编写
- 三、LED屏显示温湿度
- 四、LED屏显示自己的姓名学号
- 1、准备
- 2、显示自己的姓名学号
- 五、滚动字幕显示
- 1、代码编写
- 2、结果展示
- 六、参考博客
IIC(Inter－Integrated Circuit)总线是一种由NXP（原PHILIPS）公司开发的两线式串行总线，用于连接微控制器及其外围设备。多用于主控制器和从器件间的主从通信，在小数据量场合使用，传输距离短，任意时刻只能有一个主机等特性。
在 CPU 与被控 IC 之间、IC 与 IC 之间进行双向传送，高速 IIC 总线一般可达 400kbps 以上。
2、软件IIC和硬件IICIIC分为软件IIC和硬件IIC
软件IIC：软件IIC通信指的是用单片机的两个I/O端口模拟出来的IIC，用软件控制管脚状态以模拟I2C通信波形，软件模拟寄存器的工作方式。
硬件IIC：一块硬件电路，硬件I2C对应芯片上的I2C外设，有相应I2C驱动电路，其所使用的I2C管脚也是专用的，硬件（固件）I2C是直接调用内部寄存器进行配置。
硬件I2C的效率要远高于软件的，而软件I2C由于不受管脚限制，接口比较灵活。
二、功能实现 1、STM32Cube配置 2、Keil编写用keil打开：
下载AHT20芯片代码的头文件；
添加头文件
mian函数中添加代码：
int main(void)
{
uint32_t CT_data[2]={0,0};
volatile int c1,t1;
Delay_1ms(500);
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_DMA_Init();
MX_USART1_UART_Init();
//初始化AHT20
AHT20_Init();
Delay_1ms(500);
while (1)
{
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_crc(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）
printf("正在检测");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
printf("rn");
HAL_Delay(1000);
printf("温度:%d%d.%d",t1/100,(t1/10)%10,t1%10);
printf("湿度:%d%d.%d",c1/100,(c1/10)%10,c1%10);
printf("rn");
printf("等待");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
printf("rn");
HAL_Delay(1000);
}
}
运行结果：
在keil main.c修改
#include "delay.h"
#include "usart.h"
#include "bsp_i2c.h"
#include "sys.h"
#include "oled.h"
#include "gui.h"
#include "test.h"
int main(void)
{
delay_init(); //延时函数初始化
uart_init(115200);
IIC_Init();
NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
OLED_Init(); //初始化OLED
OLED_Clear(0);
while(1)
{
//printf("温度湿度显示");
read_AHT20_once();
OLED_Clear(0);
delay_ms(1500);
}
}
修改bsp_i2c.c文件中的read_AHT20函数：
void read_AHT20(void)
{
uint8_t i;
for(i=0; i<6; i++)
{
readByte[i]=0;
}
//-------------
I2C_Start();
I2C_WriteByte(0x71);
ack_status = Receive_ACK();
readByte[0]= I2C_ReadByte();
Send_ACK();
readByte[1]= I2C_ReadByte();
Send_ACK();
readByte[2]= I2C_ReadByte();
Send_ACK();
readByte[3]= I2C_ReadByte();
Send_ACK();
readByte[4]= I2C_ReadByte();
Send_ACK();
readByte[5]= I2C_ReadByte();
SendNot_Ack();
//Send_ACK();
I2C_Stop();
//--------------
if( (readByte[0] & 0x68) == 0x08 )
{
H1 = readByte[1];
H1 = (H1<<8) | readByte[2];
H1 = (H1<<8) | readByte[3];
H1 = H1>>4;
H1 = (H1*1000)/1024/1024;
T1 = readByte[3];
T1 = T1 & 0x0000000F;
T1 = (T1<<8) | readByte[4];
T1 = (T1<<8) | readByte[5];
T1 = (T1*2000)/1024/1024 - 500;
AHT20_OutData[0] = (H1>>8) & 0x000000FF;
AHT20_OutData[1] = H1 & 0x000000FF;
AHT20_OutData[2] = (T1>>8) & 0x000000FF;
AHT20_OutData[3] = T1 & 0x000000FF;
}
else
{
AHT20_OutData[0] = 0xFF;
AHT20_OutData[1] = 0xFF;
AHT20_OutData[2] = 0xFF;
AHT20_OutData[3] = 0xFF;
printf("lyy");
}
printf("rn");
printf("温度:%d%d.%d",T1/100,(T1/10)%10,T1%10);
printf("湿度:%d%d.%d",H1/100,(H1/10)%10,H1%10);
printf("rn");
t=T1/10;
t1=T1%10;
a=(float)(t+t1*0.1);
h=H1/10;
h1=H1%10;
b=(float)(h+h1*0.1);
sprintf(strTemp,"%.1f",a); //调用Sprintf函数把DHT11的温度数据格式化到字符串数组变量strTemp中
sprintf(strHumi,"%.1f",b); //调用Sprintf函数把DHT11的湿度数据格式化到字符串数组变量strHumi中
//printf(strTemp);
//printf("/r/n");
GUI_ShowCHinese(16,00,16,"温湿度显示",1);
GUI_ShowCHinese(16,20,16,"温度",1);
GUI_ShowString(53,20,strTemp,16,1);
GUI_ShowCHinese(16,38,16,"湿度",1);
GUI_ShowString(53,38,strHumi,16,1);
delay_ms(1500);
delay_ms(1500);
delay_ms(1500);
delay_ms(1500);
}
制作点阵字：
添加的代码中
"温",0x00,0x00,0x23,0xF8,0x12,0x08,0x12,0x08,0x83,0xF8,0x42,0x08,0x42,0x08,0x13,0xF8, 0x10,0x00,0x27,0xFC,0xE4,0xA4,0x24,0xA4,0x24,0xA4,0x24,0xA4,0x2F,0xFE,0x00,0x00, "度",0x01,0x00,0x00,0x80,0x3F,0xFE,0x22,0x20,0x22,0x20,0x3F,0xFC,0x22,0x20,0x22,0x20, 0x23,0xE0,0x20,0x00,0x2F,0xF0,0x24,0x10,0x42,0x20,0x41,0xC0,0x86,0x30,0x38,0x0E, "湿",0x00,0x00,0x27,0xF8,0x14,0x08,0x14,0x08,0x87,0xF8,0x44,0x08,0x44,0x08,0x17,0xF8, 0x11,0x20,0x21,0x20,0xE9,0x24,0x25,0x28,0x23,0x30,0x21,0x20,0x2F,0xFE,0x00,0x00, "显",0x00,0x00,0x1F,0xF0,0x10,0x10,0x10,0x10,0x1F,0xF0,0x10,0x10,0x10,0x10,0x1F,0xF0, 0x04,0x40,0x44,0x44,0x24,0x44,0x14,0x48,0x14,0x50,0x04,0x40,0xFF,0xFE,0x00,0x00, "示",0x00,0x00,0x3F,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFE,0x01,0x00, 0x01,0x00,0x11,0x10,0x11,0x08,0x21,0x04,0x41,0x02,0x81,0x02,0x05,0x00,0x02,0x00,
编译生成HEX文件
用FlyMcu进行烧录
1、资料下载
http://www.lcdwiki.com/res/Program/OLED/0.96inch/SPI_SSD1306_MSP096X_V1.0/0.96inch_SPI_OLED_Module_SSD1306_MSP096X_V1.0.zip
2、打开Demo的工程，使用keil编译
3、烧录程序
4、连接显示屏和开发板
李(0) 长(1) 乐(2)
{0x80,0x08,0x84,0x08,0x44,0x08,0x44,0x08,0x24,0x09,0x14,0x49,0x0C,0x89,0xFF,0x79},
{0x0C,0x0D,0x14,0x0B,0x24,0x09,0x44,0x08,0x44,0x08,0x84,0x08,0x80,0x08,0x00,0x00},
{0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0xFF,0xFF,0x80,0x40,0x80,0x21,0xA0,0x12},
{0x90,0x04,0x88,0x08,0x84,0x10,0x82,0x20,0x80,0x20,0x80,0x40,0x80,0x40,0x00,0x00},
{0x00,0x00,0x00,0x20,0xE0,0x10,0x9C,0x08,0x84,0x06,0x84,0x40,0x84,0x80,0xF4,0x7F},
{0x82,0x00,0x82,0x00,0x83,0x02,0x82,0x04,0x80,0x08,0x80,0x30,0x00,0x00,0x00,0x00},
点阵编码
添加代码:
编写显示函数
void TEST_MainPage(void)
{
GUI_ShowCHinese(28,20,16,"李静",1);//中文姓名
GUI_ShowString(4,48,"631907060311",16,1);//数字详细
delay_ms(1500);
delay_ms(1500);
}
编写main函数:
int main(void)
{
delay_init(); //延时函数初始化
OLED_Init(); //初始化OLED
OLED_Clear(0); //清屏（全黑）
while(1)
{
TEST_MainPage(); //界面显示
}
}
成果展示
水平滚动：
OLED_WR_Byte(0x2E,OLED_CMD); //关闭滚动 OLED_WR_Byte(0x26,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(0x07,OLED_CMD); //终止页 7 OLED_WR_Byte(0x00,OLED_CMD); //虚拟字节 OLED_WR_Byte(0xFF,OLED_CMD); //虚拟字节 OLED_WR_Byte(0x2F,OLED_CMD); //开启滚动
垂直滚动：
OLED_WR_Byte(0x2e,OLED_CMD); //关闭滚动 OLED_WR_Byte(0x29,OLED_CMD); //水平垂直和水平滚动左右 29/2a 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(0x07,OLED_CMD); //终止页 1 OLED_WR_Byte(0x01,OLED_CMD); //垂直滚动偏移量 OLED_WR_Byte(0x2F,OLED_CMD); //开启滚动
添加字模：
欢(0) 迎(1) 来(2) 到(3) 重(4) 庆(5) 交(6) 通(7) 大(8) 学(9)
{0x04,0x10,0x24,0x08,0x44,0x06,0x84,0x01,0x64,0x82,0x9C,0x4C,0x40,0x20,0x30,0x18},
{0x0F,0x06,0xC8,0x01,0x08,0x06,0x08,0x18,0x28,0x20,0x18,0x40,0x00,0x80,0x00,0x00},
{0x40,0x00,0x40,0x40,0x42,0x20,0xCC,0x1F,0x00,0x20,0x00,0x40,0xFC,0x4F,0x04,0x44},
{0x02,0x42,0x00,0x40,0xFC,0x7F,0x04,0x42,0x04,0x44,0xFC,0x43,0x00,0x40,0x00,0x00},
{0x00,0x21,0x08,0x21,0x08,0x11,0x28,0x11,0xC8,0x09,0x08,0x05,0x08,0x03,0xFF,0xFF},
{0x08,0x03,0x08,0x05,0x88,0x09,0x68,0x11,0x08,0x11,0x08,0x21,0x00,0x21,0x00,0x00},
{0x42,0x40,0x62,0xC4,0x52,0x44,0x4A,0x44,0xC6,0x7F,0x42,0x24,0x52,0x24,0x62,0x24},
{0xC2,0x20,0x00,0x00,0xF8,0x0F,0x00,0x40,0x00,0x80,0xFF,0x7F,0x00,0x00,0x00,0x00},
{0x10,0x40,0x10,0x40,0x14,0x50,0xD4,0x57,0x54,0x55,0x54,0x55,0x54,0x55,0xFC,0x7F},
{0x52,0x55,0x52,0x55,0x52,0x55,0xD3,0x57,0x12,0x50,0x10,0x40,0x10,0x40,0x00,0x00},
{0x00,0x40,0x00,0x30,0xFC,0x0F,0x04,0x80,0x84,0x40,0x84,0x20,0x84,0x18,0x85,0x06},
{0xF6,0x01,0x84,0x06,0x84,0x18,0x84,0x20,0x84,0x40,0x84,0x80,0x04,0x80,0x00,0x00},
{0x08,0x80,0x08,0x81,0x88,0x40,0x68,0x40,0x08,0x21,0x08,0x22,0x09,0x14,0x0E,0x08},
{0x08,0x14,0x08,0x22,0x88,0x41,0x28,0x40,0x48,0x80,0x88,0x81,0x08,0x80,0x00,0x00},
{0x40,0x80,0x42,0x40,0xCC,0x3F,0x00,0x40,0x00,0x80,0xE2,0xFF,0x22,0x89,0x2A,0x89},
{0x2A,0x89,0xF2,0xBF,0x2A,0x89,0x26,0xA9,0x22,0xC9,0xE0,0xBF,0x00,0x80,0x00,0x00},
{0x20,0x80,0x20,0x80,0x20,0x40,0x20,0x20,0x20,0x10,0x20,0x0C,0x20,0x03,0xFF,0x00},
{0x20,0x03,0x20,0x0C,0x20,0x10,0x20,0x20,0x20,0x40,0x20,0x80,0x20,0x80,0x00,0x00},
{0x40,0x04,0x30,0x04,0x11,0x04,0x96,0x04,0x90,0x04,0x90,0x44,0x91,0x84,0x96,0x7E},
{0x90,0x06,0x90,0x05,0x98,0x04,0x14,0x04,0x13,0x04,0x50,0x04,0x30,0x04,0x00,0x00},
修改main函数
#include "delay.h"
#include "sys.h"
#include "oled.h"
#include "gui.h"
#include "test.h"
int main(void)
{
delay_init(); //延时函数初始化
NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
OLED_Init(); //初始化OLED
OLED_Clear(0); //清屏（全黑）
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(0x07,OLED_CMD); //终止页 7
OLED_WR_Byte(0x00,OLED_CMD); //虚拟字节
OLED_WR_Byte(0xFF,OLED_CMD); //虚拟字节
TEST_MainPage();
OLED_WR_Byte(0x2F,OLED_CMD); //开启滚动
}
显示函数：
void TEST_MainPage(void)
{
GUI_ShowCHinese(10,20,16,"欢迎来到重庆交通大学",1);
delay_ms(1500);
delay_ms(1500);
}
2、结果展示
https://blog.csdn.net/as480133937/article/details/105366932
https://blog.csdn.net/ChenJ_1012/article/details/121548825
