https://forge.codesys.com/forge/talk/Runtime/thread/ca287c2165/2022-08-04T04:33:27.592000ZRecent posts to Develop my own Driver2022-08-04T04:33:27.592000Z2022-08-04T04:33:27.592000Zhuunghiaubothttps://forge.codesys.com/u/huunghiaubot/https://forge.codesys.com067b8365f29282b2145cc2f58a41b4f85a80d989

<div class="markdown_content"><p>Thanks for your support!<br/> Now I created a driver and add it under SPI Master. <br/> Is it possible to use SPI out of SPI master in the root tree project? My idea is creating devices which can add a like EtherCAT or profibus but using SPI protocol.</p></div>

2022-07-07T09:53:43.776000Z2022-07-07T09:53:43.776000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.comd21d81d63b5eff5ec2af30e72e0c984a1bff48b8

<div class="markdown_content"><p>start here:<br/> <a href="https://forge.codesys.com/drv/io-drivers/doc/Generic/">https://forge.codesys.com/drv/io-drivers/doc/Generic/</a></p></div>

2022-07-07T06:59:14.099000Z2022-07-07T06:59:14.099000Zhuunghiaubothttps://forge.codesys.com/u/huunghiaubot/https://forge.codesys.com1c1fa7d4b0f9493b1ff17dcbfa5fa468ebc44d05

<div class="markdown_content"><p>Hi all,<br/> I want to write my own SPI driver on CODESYS to interface with my STM32 custom board. I spend some time reading example libraries ( Adafruit_PWM, MCP23S17 ....), Here is my doubts.<br/> 1. What is _iState? "_iState := 10;, _iState := 1000;", Where are the numbers "10,1000" come from? What do they mean?, How many states does CODESYS support?<br/> 2. When will AfterReadInputs and BeforeWriteOuputs be called? Do they call in sequence? <br/> 3. What happen if I use more than 1 driver on the same SPI driver? Which driver will be called first?<br/> 4. What are the essential configs I need to do in Initialize Method?<br/> 5. Is there any official document talking clear about how to write a lib on CODESYS?</p></div>