LPC5526 9bit uart multiprocessor setup

jeroenbussink — Wed, 06 May 2020 13:46:54 GMT

Hi,

I'm using a LPC5526 and I want to setup 9bit UART (RS485) communication, the 9th bit is used for the address detection.

The manual states that the CPU should be capable of 9bit multiprocessor:

Only in the GUI peripheral setup there no option to choose it, also in the fsl_usart.h file there a no enums / functions to configure this. Im using the 2.1.1 driver from the SDK.#

Do I look in the wrong place or are these options not available in the driver library?

Re: LPC5526 9bit uart multiprocessor setup

xiangjun_rong — Thu, 07 May 2020 05:29:03 GMT

Hi, Jeroen,

I agree with you that the usart driver does not have any declaration, macro, enums for the 9 bits data support, but the hardware of USART module supports 9 bits data format.

This is the USART FIFO registers, obviously, it supports 9 bits data, the bits is from 0 to 8, the total is 9 bits.

XiangJun Rong

topic LPC5526 9bit uart multiprocessor setup in LPC Microcontrollers

LPC5526 9bit uart multiprocessor setup

Re: LPC5526 9bit uart multiprocessor setup