topic Re: UART not working in LPC Microcontrollers

UART not working

coder1610 — Tue, 16 Apr 2024 08:29:52 GMT

I want to use LPC804M101JDH24 for serial communication. I have attached code which is not working.

It seems that the character is not received. I have used PIO0_4 and PIO0_0 as TX and RX and linked all necessary header files as well.

Please suggest what is wrong in code.

Thanks in advance.

xiangjun_rong — Wed, 17 Apr 2024 05:34:31 GMT

Hi,

You gave us only part of code, I do not know if you understand how to initialize the SWM:

Enable_Periph_Clock(CLK_SWM);

SWM->PINASSIGN_DATA[0]=0x0000;

SWM->PINASSIGN_DATA[0]|=4<<0|0<<8;

Then PIO0_4 will function as UIART0_TXD, PIO0_0 will function as UART0_RXD

If the uart0 receiver can not get char, pls check the baud rate.

Hope it can help you

XiangJun Rong

coder1610 — Thu, 18 Apr 2024 05:58:16 GMT

Well I have included swm.h file, which is attached here.

Also, baud rate is 9600 which is not an issue.

Please help.

Thank you.

xiangjun_rong — Thu, 18 Apr 2024 07:18:22 GMT

Hi,

Pls write a code to repeat to output char, then connect a scope to an scope and check if you can see the waveform and check the baud rate.

Hope it can help you

XiangJun Rong