LPC MicrocontrollersのトピックAbout LPC844 I2C question

About LPC844 I2C question

DerekXiang — Thu, 10 Jan 2019 04:25:44 GMT

Hi, All,

I used the LPC844 I2C module in slave mode. But the another MCU works very faster than LPC844. So, I need that LPC844 could hold SCL clock line low after a complete I2C transmission, indicating that it is busy now. After LPC844 complete the current process, LPC844 release SCL single, then the main MCU could operate I2C bus normally.

I do not find this function in user manual. How to realize these I2C operation in software?

Hope to help to settle my question. Thanks!!!

Re: About LPC844 I2C question

xiangjun_rong — Wed, 16 Jan 2019 05:15:07 GMT

Hi, Derek,

When the LPC844 works in slave mode, the slave IIC module is not able to drive the SCL low to have a delay between two transfer after the completion of current data transfer.

I think you can have master add a delay between the data transfer so that the slave has enough time to handle the data reading/writting.

Hope it can help you

XiangJun Rong