topic Re: I2C Slave Mode for LPC8N04 in LPC Microcontrollers

I2C Slave Mode for LPC8N04

syazdanp — Wed, 20 Jun 2018 13:17:02 GMT

I look for I2C slave mode example code for LPC8N04 , dose anyone know a nice source code example even for similar chip, documents,.... to start? Thanks in advance.

Re: I2C Slave Mode for LPC8N04

syazdanp — Wed, 20 Jun 2018 13:33:34 GMT

I can not find related function for Transmit and Receive data in slave mode in i2c_8Nxx.c library. I need to read my address from Master but can not find slave read function at the first step.

I really appreciate if you can give some hint toward it.

Re: I2C Slave Mode for LPC8N04

kerryzhou — Thu, 21 Jun 2018 03:29:17 GMT

Hi Audrey Jam,

Unfortunately, until now, about the sample code, we just have the i2c_8Nxx.c, we still don't have the dedicated i2c sample code.

About the document, please refer tot he LPC8N04 user manual I2C chapter:

https://www.nxp.com/docs/en/user-guide/UM11074.pdf

Actually, in the the i2c_8Nxx.c, there has some slave read and send data, it is in handleSlaveXferState function.

About the slave address, actually, it is configured in the slave code, then when the master send the according slave addres, the I2C slave will match, and will get the according status in teh I2C status register. You don't need to read the slave address from master in the slave code. The slave address can be set with function setSlaveAddr.

Wish it helps you!

Have a great day,
Kerry

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Re: I2C Slave Mode for LPC8N04

syazdanp — Thu, 21 Jun 2018 12:47:36 GMT

Thanks for your answer, I will use it and let you know if i need more clarification.

best regards

Re: I2C Slave Mode for LPC8N04

syazdanp — Fri, 22 Jun 2018 12:31:02 GMT

Hi Kerry

I have developed my project with I2C LPC8N04 to use in slave Mode implemented based on LPC8N04-MCUXpresso-BSP.zip from NXP and chapter 16 I2C of user Manual. My slave address is 0x1E coming from master, but by using interrupt based operation I am not able to see my slave address or having any communication with master. I have tried Chip_I2C_EventHandler which does not work and then using poling Chip_I2C_EventHandlerPolling, but still my I2C does not work. My second problem is setting right address mask. Please see the attached file. I really appreciate if you can take a look and see which part of my setting is wrong.

I have set (in LPC_I2C_T) I2C_Regs.CONSET= 0x44; // 01000100 based on manual , but my SI bit never changes to 1. I set consent and slave address registers ,and did not config rest of registers, am i wrong?Thanks in advance, best regards

Re: I2C Slave Mode for LPC8N04

kerryzhou — Thu, 28 Jun 2018 02:53:21 GMT

Hi Audrey,

It seems you missed the attached file, please attach it again, please also tell me what the I2C data and detail address you want to send in the I2C bus, I will check it on my side when I have time.

Have a great day,
Kerry