321 lines
8.2 KiB
C
321 lines
8.2 KiB
C
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#include "ST_I2C.h"
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#define TRUE 1
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#define FALSE 0
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static uint8_t ST_IIC_Start(void);
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static void ST_IIC_Stop(void);
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static void ST_IIC_Send_Byte(uint8_t txd);
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static uint8_t ST_IIC_Read_Byte(void);
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static uint8_t ST_IIC_Wait_Ack(void);
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static void ST_IIC_Ack(void);
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static void ST_IIC_NAck(void);
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static void IIC_delay(void)
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{
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volatile uint8_t i=5;//第一次使用时需要增加到1000
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while(i)
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{
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i--;
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}
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}
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/**************************实现函数********************************************
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*函数原型: void ST_IIC_Start(void)
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*功 能: 产生IIC起始信号
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*******************************************************************************/
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static uint8_t ST_IIC_Start(void)
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{
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SDA_H;
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SCL_H;
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IIC_delay();
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if(!SDA_read)
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return FALSE;
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SDA_L;
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IIC_delay();
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if(SDA_read)
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return FALSE;
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SDA_L;
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IIC_delay();
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return TRUE;
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}
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/**************************实现函数********************************************
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*函数原型: void ST_IIC_Stop(void)
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*功 能: //产生IIC停止信号
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*******************************************************************************/
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static void ST_IIC_Stop(void)
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{
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SCL_L;
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IIC_delay();
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SDA_L;
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IIC_delay();
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SCL_H;
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IIC_delay();
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SDA_H;
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IIC_delay();
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}
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/**************************实现函数********************************************
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*函数原型: uint8_t ST_IIC_Wait_Ack(void)
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*功 能: 等待应答信号到来
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//返回值：1，接收应答失败
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// 0，接收应答成功
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*******************************************************************************/
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static uint8_t ST_IIC_Wait_Ack(void)
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{
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SCL_L;
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IIC_delay();
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SDA_H;
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IIC_delay();
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SCL_H;
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IIC_delay();
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if(SDA_read)
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{
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SCL_L;
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IIC_delay();
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return FALSE;
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}
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SCL_L;
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IIC_delay();
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return TRUE;
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}
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/**************************实现函数********************************************
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*函数原型: void ST_IIC_Ack(void)
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*功 能: 产生ACK应答
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*******************************************************************************/
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static void ST_IIC_Ack(void)
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{
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SCL_L;
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IIC_delay();
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SDA_L;
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IIC_delay();
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SCL_H;
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IIC_delay();
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SCL_L;
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IIC_delay();
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}
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/**************************实现函数********************************************
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*函数原型: void ST_IIC_NAck(void)
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*功 能: 产生NACK应答
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*******************************************************************************/
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static void ST_IIC_NAck(void)
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{
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SCL_L;
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IIC_delay();
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SDA_H;
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IIC_delay();
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SCL_H;
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IIC_delay();
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SCL_L;
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IIC_delay();
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}
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/**************************实现函数********************************************
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*函数原型: void ST_IIC_Send_Byte(uint8_t txd)
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*功 能: IIC发送一个字节
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*******************************************************************************/
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static void ST_IIC_Send_Byte(uint8_t SendByte)
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{
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uint8_t i=8;
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while(i--)
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{
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SCL_L;
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IIC_delay();
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if(SendByte&0x80)
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SDA_H;
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else
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SDA_L;
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SendByte<<=1;
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IIC_delay();
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SCL_H;
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IIC_delay();
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}
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SCL_L;
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}
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/**************************实现函数********************************************
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*函数原型: uint8_t ST_IIC_Read_Byte(unsigned char ack)
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*功 能: //读1串字节，ack=1时，发送ACK，ack=0，发送nACK
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*******************************************************************************/
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static unsigned char ST_IIC_Read_Byte(void)
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{
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uint8_t i=8;
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uint8_t ReceiveByte=0;
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SDA_H;
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while(i--)
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{
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ReceiveByte<<=1;
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SCL_L;
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IIC_delay();
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SCL_H;
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IIC_delay();
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if(SDA_read)
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{
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ReceiveByte|=0x01;
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}
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}
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SCL_L;
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return ReceiveByte;
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}
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/**************************实现函数********************************************
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*函数原型: unsigned char IIC_ReadOneByte(unsigned char I2C_Addr,unsigned char addr)
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*功 能: 读取指定设备 指定寄存器的一个值
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输入 I2C_Addr 目标设备地址
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addr 寄存器地址
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返回 读出来的值
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*******************************************************************************/
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uint8_t IIC_ReadOneByte(uint8_t SlaveAddress,uint8_t REG_Address)
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{
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if(!ST_IIC_Start())
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return FALSE;
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ST_IIC_Send_Byte(SlaveAddress);
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if(!ST_IIC_Wait_Ack())
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{
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ST_IIC_Stop();
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return FALSE;
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}
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ST_IIC_Send_Byte((uint8_t) REG_Address);
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ST_IIC_Wait_Ack();
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ST_IIC_Start();
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ST_IIC_Send_Byte(SlaveAddress+1);
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ST_IIC_Wait_Ack();
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ST_IIC_Read_Byte();
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ST_IIC_NAck();
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ST_IIC_Stop();
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//return TRUE;
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return 0;
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}
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/**************************实现函数********************************************
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*函数原型: uint8_t IICreadBytes(uint8_t dev, uint8_t reg, uint8_t length, uint8_t *data)
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*功 能: 读取指定设备 指定寄存器的 length个值
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输入 dev 目标设备地址
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reg 寄存器地址
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length 要读的字节数
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*data 读出的数据将要存放的指针
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返回 读出来的字节数量
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*******************************************************************************/
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uint8_t ST_IICreadBytes(uint8_t SlaveAddress,uint8_t REG_Address,uint8_t len,uint8_t *data)
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{
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uint8_t i = 0;
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if(!ST_IIC_Start())
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return FALSE;
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ST_IIC_Send_Byte(SlaveAddress);
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if(!ST_IIC_Wait_Ack())
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{
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ST_IIC_Stop();
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return FALSE;
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}
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ST_IIC_Send_Byte((uint8_t) REG_Address);
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ST_IIC_Wait_Ack();
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ST_IIC_Start();
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ST_IIC_Send_Byte(SlaveAddress+1);
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ST_IIC_Wait_Ack();
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for(i = 0;i<len;i++)
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{
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if(i != (len -1))
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{
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data[i]= ST_IIC_Read_Byte();
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ST_IIC_Ack();
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}
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else
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{
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data[i]= ST_IIC_Read_Byte();
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ST_IIC_NAck();
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}
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}
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ST_IIC_Stop();
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//return TRUE;
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return 0;
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}
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/**************************实现函数********************************************
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*函数原型: uint8_t IICwriteBytes(uint8_t dev, uint8_t reg, uint8_t length, uint8_t* data)
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*功 能: 将多个字节写入指定设备 指定寄存器
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输入 dev 目标设备地址
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reg 寄存器地址
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length 要写的字节数
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*data 将要写的数据的首地址
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返回 返回是否成功
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*******************************************************************************/
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uint8_t ST_IICwriteBytes(uint8_t dev, uint8_t reg, uint8_t length, uint8_t* data)
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{
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uint8_t count = 0;
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ST_IIC_Start();
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ST_IIC_Send_Byte(dev);
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ST_IIC_Wait_Ack();
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ST_IIC_Send_Byte(reg);
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ST_IIC_Wait_Ack();
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for(count=0;count<length;count++)
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{
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ST_IIC_Send_Byte(data[count]);
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ST_IIC_Wait_Ack();
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}
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ST_IIC_Stop();
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return 0; //status == 0;
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}
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/**************************实现函数********************************************
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*函数原型: uint8_t IICreadByte(uint8_t dev, uint8_t reg, uint8_t *data)
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*功 能: 读取指定设备 指定寄存器的一个值
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输入 dev 目标设备地址
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reg 寄存器地址
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*data 读出的数据将要存放的地址
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返回 1
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*******************************************************************************/
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uint8_t ST_IICreadByte(uint8_t dev, uint8_t reg, uint8_t *data)
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{
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*data=IIC_ReadOneByte(dev, reg);
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return 0;
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}
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/**************************实现函数********************************************
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*函数原型: unsigned char IICwriteByte(unsigned char dev, unsigned char reg, unsigned char data)
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*功 能: 写入指定设备 指定寄存器一个字节
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输入 dev 目标设备地址
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reg 寄存器地址
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data 将要写入的字节
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返回 1
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*******************************************************************************/
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uint8_t ST_IICwriteByte(uint8_t dev, uint8_t reg, uint8_t data)
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{
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return ST_IICwriteBytes(dev, reg, 1, &data);
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}
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/**************************实现函数********************************************
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*函数原型: uint8_t IICwriteBit(uint8_t dev, uint8_t reg, uint8_t bitNum, uint8_t data)
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*功 能: 读 修改 写 指定设备 指定寄存器一个字节 中的1个位
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输入 dev 目标设备地址
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reg 寄存器地址
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bitNum 要修改目标字节的bitNum位
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data 为0 时，目标位将被清0 否则将被置位
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返回 成功 为1
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失败为0
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*******************************************************************************/
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uint8_t ST_IICwriteBit(uint8_t dev, uint8_t reg, uint8_t bitNum, uint8_t data)
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{
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uint8_t b;
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ST_IICreadByte(dev, reg, &b);
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b = (data != 0) ? (b | (1 << bitNum)) : (b & ~(1 << bitNum));
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return ST_IICwriteByte(dev, reg, b);
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}
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//------------------End of File----------------------------
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