ARM使用I2C。

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 


//i2c_msg MSG[2];


int main(int argc, char** argv)
{
	i2c_rdwr_ioctl_data i2cdata;
	i2c_msg* addr_MSG = new i2c_msg[2];
	unsigned char Buf_send[2] = { 0x40, 0x50 };
	unsigned char Buf_Re[2] = { '\0', '\0' };

	int fd = open("/dev/i2c-0", O_RDWR);
	if (fd < 0)
	{
		printf("open error!\n");
	}
	ioctl(fd, I2C_TIMEOUT, 1);
	ioctl(fd, I2C_RETRIES, 2);

	//i2Cdata填充数据
	i2cdata.nmsgs = 2;
	i2cdata.msgs = addr_MSG;

	//MSG数据填充   //write
	addr_MSG[0].addr = 0x50;
	addr_MSG[0].len = 2;
	addr_MSG[0].flags = 0;
	addr_MSG[0].buf = Buf_send;

	//read
	addr_MSG[1].addr = 0x50;
	addr_MSG[1].len = 2;
	addr_MSG[1].flags = I2C_M_RD;
	addr_MSG[1].buf = Buf_Re;


	int res = ioctl(fd, I2C_RDWR, (unsigned long)&i2cdata);
	if (res < 0)
	{
		perror("ioctl error");
	}
    delete[] addr_MSG;
	close(fd);
}