VMware virtual machine+Fedora10, hardware platform TQ2440, kernel 2.6.30.4 The corresponding driver is suddenly enlightened, and after adding some dev_dbg, I also have some reference tips for the places I don't understand, which I will record and share with you. The test procedure is as follows: /*i2c_test.c * hongtao_liu */ #include #include #include #include #include #include #include #include #define I2C_RETRIES 0x0701 #define I2C_TIMEOUT 0x0702 #define I2C_RDWR 0x0707 /*********Define struct i2c_rdwr_ioctl_data and struct i2c_msg, consistent with the kernel*******/ struct i2c_msg { unsigned short addr; unsigned short flags; #define I2C_M_TEN 0x0010 #define I2C_M_RD 0x0001 unsigned short len; unsigned char *buf; }; struct i2c_rdwr_ioctl_data { struct i2c_msg *msgs; int nmsgs; /* The number of nmsgs determines how many start signals there are, for "single start timing", take 1*/ }; /***********Main program***********/ int main() { int fd, ret; struct i2c_rdwr_ioctl_data e2prom_data; fd = open("/dev/i2c-0", O_RDWR); /* *dev/i2c-0 is generated after registering i2c-dev.c and represents an operational adapter. If not using i2c-dev.c * way, there is no and no need for this node. */ if (fd < 0) { perror("open error"); } e2prom_data.nmsgs=2; /* *Because in the operation sequence, at most 2 start signals (in byte read operation) are used, this will *e2prom_data.nmsgs is configured as 2 */ e2prom_data.msgs=(struct i2c_msg*) malloc(e2prom_data.nmsgs*sizeof(struct i2c_msg)); if(!e2prom_data.msgs) { perror("malloc error"); exit(1); } ioctl(fd, I2C_TIMEOUT, 1); /*timeout*/ ioctl(fd, I2C_RETRIES, 2); /* number of repetitions */ /***write data to e2prom**/ e2prom_data.nmsgs=1; (e2prom_data.msgs[0]).len=2; //1 e2prom write target address and 1 data (e2prom_data.msgs[0]).addr=0x50;//e2prom device address (e2prom_data.msgs[0]).flags=0; //write (e2prom_data.msgs[0]).buf = (unsigned char*) malloc(2); (e2prom_data.msgs[0]).buf[0]=0x10;// e2prom write target address (e2prom_data.msgs[0]).buf[1]=0x58; //the data to write ret = ioctl(fd, I2C_RDWR, (unsigned long) &e2prom_data); if(ret<0) { perror("ioctl error1"); } sleep(1); /******read data from e2prom*******/ e2prom_data.nmsgs=2; (e2prom_data.msgs[0]).len=1; //The address of e2prom target data (e2prom_data.msgs[0]).addr=0x50; // e2prom device address (e2prom_data.msgs[0]).flags=0; //write (e2prom_data.msgs[0]).buf[0]=0x10;//e2prom data address (e2prom_data.msgs[1]).len=1;//Read data (e2prom_data.msgs[1]).addr=0x50;// e2prom device address (e2prom_data.msgs[1]).flags=I2C_M_RD;//read (e2prom_data.msgs[1]).buf=(unsigned char*) malloc(1);//Store the address of the return value. (e2prom_data.msgs[1]).buf[0]=0;//Initialize the read buffer ret = ioctl(fd, I2C_RDWR, (unsigned long) &e2prom_data); if(ret<0) { perror("ioctl error2"); } printf("buff[0]=%x",(e2prom_data.msgs[1]).buf[0]); /***Print the read value, if it is correct, it should be the 0x58 written earlier***/ close(fd); return 0; } Split Core Current Transformer
SCT 016 split core Current Transformer is widely used in measuring, electric power system, industrial control and other automation part. The hole diameter is 16mm. Input current can from 80 A to 120 A, and out put can be current and voltage. Current from 20mA to 1A, and voltage usually is 0.33V. Also we have terminal and wire lead out which is convenient and flexible. The accuracy class is 0.5%. we have exported to Europe countries, America and India. and got many good feedback from them.
split core current transformer
Core material: Nanocrystalline core 1K107 SCT016 Typical graph
Core loss graph
Model
Rated measure current
Accuracy
Rated output
Work
frequency
50-1KHz
FAQ
1-MOQ?
We will work hard to fit your MOQ .Small purchase quantity is ok.
2-Payment term?
T/T, Western Union, Paypal, Credit Card
3-Delivery port?
Shenzhen, Guangzhou, Zhongshan, Hongkong.
4-Shipping date?
About 7 days when we check the payment.
5-Do you produce the core and bobbin by yourself .
Yes.we have 2 head company,1 subsidiary company.one is bobbin factory,one is core factory,last one is transformer factory.
6-Where is your factory?
In ShaanxI
Split Core Current Transformer,Open Type Current Sensor,High Accuracy Current Transformer,Measuring Split Current Transformer Shaanxi Magason-tech Electronics Co.,Ltd , https://www.magason-tech.com
SCT016
120A
0.5/1
40mA
We attend Electrical exhibition In India, Germany and Brizil, South Korea...
All of our material meet the RoHs, UL , SGS, CE certification