https://forge.codesys.com/forge/talk/Runtime/thread/e43ab64335/2020-02-27T17:15:16.197000ZRecent posts to Reading DS18B20 via DS2482-8002020-02-27T17:15:16.197000Z2020-02-27T17:15:16.197000ZIngohttps://forge.codesys.com/u/ingo/https://forge.codesys.comf8d0fada0cde90432982bc7549d85c199453409d

<div class="markdown_content"><p>Nice that you found it already. If you like to turn your library into a real I/O driver afterwards, please take a look at <a class="" href="https://forge.codesys.com/drv/io-drivers/">https://forge.codesys.com/drv/io-drivers/</a></p> <p>Have fun, and if you have further questions regarding generic I/O stuff feel free to ask.</p> <p>And if you like to share your work, forge.codesys.com is a good place for that. </p> <p>Gesendet von meinem LG-H870 mit Tapatalk</p></div>

2020-02-27T17:15:13.449000Z2020-02-27T17:15:13.449000ZSchmittlichhttps://forge.codesys.com/u/schmittlich/https://forge.codesys.com1e74a17ba73cfe6fc6e7ad785d78f795738873e1

<div class="markdown_content"><p>OK, in meantime I found the first important trick how to use the "low-level" comands.<br/> Add I2C-Master and then use following syntax inside the program:</p> <p>byWrite:=i2c_master.write(16#20, ADR(byOut), 1); //Using a PCF8574<br/> byRead:=i2c_master.read(16#20, ADR(byIn), 1); //Using a PCF8574</p></div>

2020-02-27T17:15:12.465000Z2020-02-27T17:15:12.465000ZSchmittlichhttps://forge.codesys.com/u/schmittlich/https://forge.codesys.comb31ffae4f89a299a5290089c77d4750b38ac58f4

<div class="markdown_content"><p>Hello, I am mew with CODESYS<br/> But I do have experience with TwinCAT 2</p> <p>I want to read temperature from 8x DS2482 via I2C.<br/> On one port of DS2482-800 only one DS18B20 - so they can be replaced without changing the ID of the DS18B20.<br/> Therfore I want to create a simple Library for the DS2482-800</p> <p>With a MICROCHIP-PIC I can already read the DS18B20.<br/> Now I want to do the same with CODESYS on the Raspberry 3</p> <p>Can anyone assist me, in this project?<br/> As a first step, I would be happy to create some Functions to acces the DS2482.<br/> But right now, I have proplems to use the low-level comands like write8 or read8 I2C-comands inside a regular Function block.</p> <p>Lets start with the first step ... sending a reset to the DS2482</p> <p>This is, how I dit it with my PIC16F887:<br/> ' Returns: TRUE if device was reset<br/> ' FALSE device not detected or failure to perform reset<br/> '<br/> Function ds2482_reset() As Bit<br/> Dim xstatus As Byte<br/> Dim acknowledge As Bit<br/> ds2482_reset = False<br/> '// device reset<br/> I2CWrite1 sda, scl, i2c_addressw, cmd_drst<br/> WaitUs 10<br/> I2CRead1 sda, scl, i2c_addressr, xstatus<br/> '// check For failure due To incorrect Read back of STATUS<br/> xstatus = xstatus And 0xf7<br/> If xstatus = 0x10 Then ds2482_reset = True<br/> End Function</p></div>