WhyCan Forum(哇酷开发者社区)

int setI2CSlave(int fd, int slave)
{
	if (ioctl(fd, I2C_SLAVE, slave) < 0)
	{
		errMsg("Fail ioctl I2C_SLAVE");
		return -1;
	}
	return 0;
}

 /**
  * @brief  WriteCmd，向OLED写入命令
  * @param  fd:文件句柄 I2C_Command：命令代码
  * @retval 无
  */
void WriteCmd(int fd,unsigned char I2C_Command)//写命令
{
  I2CWriteByteTo(fd,0x00,I2C_Command,0);
}

int I2CWriteByteTo(int fd, int pos, unsigned char byteData, int wait_ms)
{
	if (i2c_smbus_write_byte_data(fd, (unsigned char)pos, (unsigned char)byteData) < 0)
	{
		errMsg("Fail to I2CWriteByteTo");
		return -1;
	}
	usleep(1000 * wait_ms);
	return 0;
}

struct timespec delay = {0, 1};

///**********************************************
//// 通过I2C总线写一个字节
//**********************************************/
void OLED_Write_Byte(uint8_t IIC_Byte)
{
	uint8_t i;
	IIC_SCL_LOW();
	for (i = 0; i < 8; i++)
	{
		if ((IIC_Byte & 0x80) >> 7)
			IIC_SDA_HIGH();
		else
			IIC_SDA_LOW();
		IIC_Byte <<= 1;
		IIC_SCL_HIGH();
		IIC_SCL_LOW();
		nanosleep(&delay,NULL);//本来没有的延时
	}
}

int UART_Open(int fd,char* port)
{

    fd = open( port, O_RDWR|O_NOCTTY|O_NDELAY);//非阻塞，读写，无流控
    if (FALSE == fd)
    {
        perror("Can't Open Serial Port");
        return(FALSE);
    }
    //恢复串口为阻塞状态
    if(fcntl(fd, F_SETFL, 0) < 0)
    {
        printf("fcntl failed!\n");
        return(FALSE);
    }
    else
    {
        printf("fcntl=%d\n",fcntl(fd, F_SETFL,0));
    }
    //测试是否为终端设备
    if(0 == isatty(STDIN_FILENO))//**********此处为出错代码段**************
    {
        printf("standard input is not a terminal device\n");
        return(FALSE);
    }
    else
    {
        printf("isatty success!\n");
    }
    printf("fd->open=%d\n",fd);
    return fd;
}

# ./uartRec
fcntl=0
isatty success!
fd->open=3
Receive 32
Receice 11

static void *threadRead(void *arg)//串口读取线程
{
    while(1)
    {

        bufflen=UART_Recv(uartfd,RecvBuff,150);
        if(bufflen>0)
        {
            SendBuff=(char *)malloc(bufflen);
            memcpy(SendBuff,RecvBuff,bufflen);
            printf("Receive %d\n",bufflen);
            free(SendBuff);
        }
        usleep(1000);
    }
    return NULL;
}

int UART_Recv(int fd, char *rcv_buf,int data_len)
{
    int len,fs_sel;
    fd_set fs_read;

    struct timeval time;

    FD_ZERO(&fs_read);
    FD_SET(fd,&fs_read);

    time.tv_sec = 10;//等待时间 秒
    time.tv_usec = 0;//等待时间 微妙

    //使用select实现串口的多路通信
    fs_sel = select(fd+1,&fs_read,NULL,NULL,&time);
    //printf("fs_sel = %d\n",fs_sel);
    if(fs_sel)
    {
        len = read(fd,rcv_buf,data_len);
        //printf("len = %d fs_sel = %d\n",len,fs_sel);
        return len;
    }
    else
    {
        //printf("Sorry,I am wrong!");
        return FALSE;
    }
}