what's the link between LCD waveform registers and LPUART.

Avinash_7 — Sun, 22 Aug 2021 15:05:09 GMT

Hi,

I am working on MKM34Z256xxx7, it is connected to 32pin segment LCD and LPUART for communication purpose(both are working fine).

I run the controller in VLPR and VLPS modes by switching for every 1 second. I'm using LCD on PORTA, PORTB, PORTC, PORTD and LPUART on PORTI. The issue is, if I turn on all LCD segments by will filling (0xFF) in respective waveform registers and try to send some data on LPUART, I could able to receive only a few bytes on interrupt, not getting interrupt for rest of other bytes. The LPUART interrupts are not working. If I turn off a any single segment by writing (0x00) on LCD waveform registers, then my data goes normally on LPUART.

I verified clock initializations, interrupt enable/disable stuff, respective voltages on LPUART rx/tx pins, waveforms and controller switch to VLPR whenever it get tx/rx/edge interrupts as well. I also found that if I keeps running in VLPR state, then everything working fine as expected. I was been working on this from past 3 days.

Please help me to crack this strange issue I'm facing. Thanks in advance.

Regards,

Avinash.

Re: what's the link between LCD waveform registers and LPUART.

jingpan — Fri, 27 Aug 2021 08:50:19 GMT

Hi @Avinash_7 ,

How is the problem going? Please check the NVIC->IPCR register to see if the interrupt is pending and check NVIC->ISER register to see if LPUART interrupt is enabled at that time.

Regards,

Jing

Kinetis Microcontrollersのトピックwhat's the link between LCD waveform registers and LPUART.

what's the link between LCD waveform registers and LPUART.

Re: what's the link between LCD waveform registers and LPUART.