1. I2cdev.h No Such File Or Directory

I2cdevlib - I2C device library collection for AVR/Arduino or other C++-based MCUs.

I'm trying to read/write to a FM24CL64-GTR FRAM chip that is connected over a I2C bus on address 0b 1010 011. When I'm trying to write 3 bytes (data address 2 bytes, + data one byte), I get a kernel message ( 00 i2c-adapter i2c-0: sendbytes: NAK bailout.), as well as the write returns!= 3. See code below: #include #include #include #include int file; char filename20; int addr = 0x53; // 0b1010011; /. The I2C address./ uint16t dataAddr = 0x1234; uint8t val = 0x5c; uint8t buf3; sprintf(filename,'/dev/i2c-%d',0); if ((file = open(filename,ORDWR)) 8; buf1 = dataAddr & 0xff; buf2 = val; if (write(file, buf, 3)!= 3) exit(3). However when I write 2 bytes, then write another byte, I get no kernel error, but when trying to read from the FRAM, I always get back 0.

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Here is the code to read from the FRAM: uint8t val; if ((file = open(filename,ORDWR)) struct i2crdwrioctldata workqueue; struct i2cmsg msg2; uint8t ret; workqueue.nmsgs = 2; workqueue.msgs = msg; workqueue.msgs0.addr = addr; workqueue.msgs0.len = 2; workqueue.msgs0.flags = 0; workqueue.msgs0.buf = &dataAddr; workqueue.msgs1.addr = addr; workqueue.msgs1.len = 1; workqueue.msgs1.flags = I2CMRD; workqueue.msgs1.buf = &ret; if (ioctl(file,I2CRDWR,&workqueue). I do not have experience with that particular device, but in our experience many I2C devices have 'quirks' that require a work-around, typically above the driver level. We use linux (CELinux) and an I2C device driver with Linux as well. But our application code also has a non-trivial I2C module that contains all the work-around intelligence for dealing with all the various devices we have experience with. Also, when dealing with I2C issues, I often find that I need to re-acquaint myself with the source spec: as well as the usage of a decent oscilloscope. Good luck, Above link is dead, here are some other links: and of course wikipedia. Note that the method using the struct i2crdwrioctldata and the struct i2cmsg (that is, the last code part you've given) is more efficient than the other ones, since with that method you execute the repeated start feature of I2c.

I2cdev.h No Such File Or Directory

This means you avoid a STA-WRITE-STO - STA-READ.-STO transition, because your communication will become STA-WRITE-RS-READ.STO ( RS = repeated start). So, saves you a redundant STO-STA transient. Not that it differs a lot in time, but if it's not needed, why losing on it. Just my 2 ct.

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