ctiic 驱动代码.docx

#include ctiic.h#include delay.h / /控制I2C速度的延时void CT_Delay(void)delay_us(10); /电容触摸芯片IIC接口初始化void CT_IIC_Init(void) RCC-APB2ENR|=1APB2ENR|=1CRL&=0XFFFFFF0F;/PB1 推挽输出GPIOB-CRL|=0X00000030; GPIOF-CRH&=0XFFFFFF0F;/PF9 推挽输出GPIOF-CRH|=0X00000030;GPIOB-ODR|=1ODR|=1250)CT_IIC_Stop();return 1; CT_IIC_SCL=0;/时钟输出0 return 0; /产生ACK应答void CT_IIC_Ack(void)CT_IIC_SCL=0;CT_SDA_OUT();CT_IIC_SDA=0;CT_Delay();CT_IIC_SCL=1;CT_Delay();CT_IIC_SCL=0;/不产生ACK应答 void CT_IIC_NAck(void)CT_IIC_SCL=0;CT_SDA_OUT();CT_IIC_SDA=1;CT_Delay();CT_IIC_SCL=1;CT_Delay();CT_IIC_SCL=0; /IIC发送一个字节/返回从机有无应答/1，有应答/0，无应答 void CT_IIC_Send_Byte(u8 txd) u8 t; CT_SDA_OUT(); CT_IIC_SCL=0;/拉低时钟开始数据传输 for(t=0;t7; txd=1; CT_IIC_SCL=1;CT_Delay();CT_IIC_SCL=0;CT_Delay(); /读1个字节，ack=1时，发送ACK，ack=0，发送nACK u8 CT_IIC_Read_Byte(unsigned char ack)u8 i,receive=0; CT_SDA_IN();/SDA设置为输入 for(i=0;i8;i+ ) CT_IIC_SCL=0; delay_us(30);CT_IIC_SCL=1; receiveCRH&=0XFFFFFF0F;GPIOF-CRH|=8CRH&=0XFFFFFF0F;GPIOF-CRH|=34;/IO操作函数 #define CT_IIC_SCL PBout(1) /SCL #define CT_IIC_SDA PFout(9) /SDA #define CT_READ_SDA PFin(9) /输入SDA /IIC所有操作函数void CT_IIC_Init(void); /初始化IIC的IO口 void CT_IIC_Start(void);/发送IIC开始信号void CT_IIC_Stop(void); /发送IIC停止信号void CT_IIC_Send_Byte(u8 txd);/IIC发送一个字节u8 CT_IIC_Read_Byte(unsigned char ack);/IIC读取一个字节u8 CT_IIC_Wait_Ack(void); /IIC等待ACK信号void