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使用STM32F103C8T6单片机驱动I2C-1602A模块 （只需要焊接4根线到STM32）

源程序如下:

#include  #include "delay.h" #include "IIC_1602.h" extern unsigned char LCD_data; /** * @brief I2C_Configuration，初始化硬件IIC引脚 * @param 无 * @retval 无 */ void I2C_Configuration(void) { I2C_InitTypeDef I2C_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); /*STM32F103C8T6芯片的硬件I2C: PB6 -- SCL; PB7 -- SDA */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;//I2C必须开漏输出 GPIO_Init(GPIOB, &GPIO_InitStructure); I2C_DeInit(I2C1);//使用I2C1 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; I2C_InitStructure.I2C_OwnAddress1 = 0x30;//主机的I2C地址,随便写的 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStructure.I2C_ClockSpeed = 400000;//400K I2C_Cmd(I2C1, ENABLE); I2C_Init(I2C1, &I2C_InitStructure); } /** * @brief I2C_WriteByte，向OLED寄存器地址写一个byte的数据 * @param addr：寄存器地址 * data：要写入的数据 * @retval 无 */ void I2C_WriteByte(unsigned char data) { while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); I2C_GenerateSTART(I2C1, ENABLE);//开启I2C1 while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));/*EV5,主模式*/ I2C_Send7bitAddress(I2C1, LCD_ADDR, I2C_Direction_Transmitter);//器件地址 -- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); // I2C_SendData(I2C1, addr);//寄存器地址 // while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); I2C_SendData(I2C1, data);//发送数据 while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); I2C_GenerateSTOP(I2C1, ENABLE);//关闭I2C1总线 } void LCD_EN() { LCD_data |= 1<<2; I2C_WriteByte(LCD_data);//1 读取数据 DelayUs(25);//延时 LCD_data ^= 1<<2; I2C_WriteByte(LCD_data);//1→0 执行指令 } void LCD_WriteCMD(unsigned char cmd) { DelayUs(25); LCD_data &=~(1<<(1-1));//RS=0; LCD_data &=~(1<<(2-1));//RW=0; I2C_WriteByte(LCD_data); LCD_data &= 0X0f; //清高四位 LCD_data |= cmd & 0xf0; //写指令高四位 I2C_WriteByte(LCD_data); LCD_EN(); cmd = cmd<<4; LCD_data &= 0X0f; //清高四位 LCD_data |= cmd & 0xf0; //写指令低四位 I2C_WriteByte(LCD_data); LCD_EN(); } void LCD_WriteDAT(unsigned char dat) { DelayUs(25); LCD_data |= (1<<(1-1));//RS=0; LCD_data &=~(1<<(2-1));//RW=0; I2C_WriteByte(LCD_data); LCD_data &= 0X0f; //清高四位 LCD_data |= dat & 0xf0; //写数据高四位 I2C_WriteByte(LCD_data); LCD_EN(); dat = dat<<4; LCD_data &= 0X0f; //清高四位 LCD_data |= dat & 0xf0; //写数据低四位 I2C_WriteByte(LCD_data); LCD_EN(); } void Set_Position(unsigned char x,unsigned char y) { unsigned char x_pos; x_pos = x%0x10; if(y==0) { LCD_WriteCMD(0x80+x_pos); } else { LCD_WriteCMD(0xc0+x_pos); } } void LCD_ShowStr(unsigned char x,unsigned char y,unsigned char * str) { Set_Position(x,y); while(*str) { LCD_WriteDAT(*str); str++; } } void LCD_Init() { LCD_WriteCMD(0x28);//4线操作模式 LCD_WriteCMD(0x0c);// LCD_WriteCMD(0x80); LCD_WriteCMD(0x01); DelayMs(5); } void LCD_DispConf(unsigned char DispON,unsigned char CursorON,unsigned char GlareON) { unsigned char x = 0x08; if(DispON!=0) { x = x|(DispON<<2); } if(CursorON!=0) { x = x|(CursorON<<1); } if(GlareON!=0) { x = x|GlareON; } LCD_WriteCMD(x); }