topic Re: S32K144 UART Callback in S32K

S32K144 UART Callback

jay_zhang — Mon, 11 Mar 2019 05:26:50 GMT

I met a problem when I need to use a uart interface peripheral.

While using UART0 to receive the uart data, I don't know how to clear the flag in RX Callback function, the code will not exit in RX_callback function, anyone can help?

Re: S32K144 UART Callback

B46399 — Mon, 11 Mar 2019 08:14:05 GMT

Hi,

Which version of SDK are you using?

Thanks,

Vlad

Re: S32K144 UART Callback

PetrS — Mon, 11 Mar 2019 08:28:56 GMT

Hi,

I have tested the lpuart_echo_s32k144 demo from SDK RTM 2.0.0 and see no issue, rx callback is called only once when byte is received.

Generally, you need not to clear any flags in callback functions. This callback is called from the interrupt handler which contains code for flags clearing already. Moreover RDRF flag is cleared by reading data register, so flag should be cleared before callback is called.

BR, Petr

Re: S32K144 UART Callback

jay_zhang — Mon, 11 Mar 2019 08:37:10 GMT

Have you tried to use the callback install, in my code, after some buffer coming, the callback function is called, and always called, cannot go to main code section.

Re: S32K144 UART Callback

jay_zhang — Mon, 11 Mar 2019 09:17:03 GMT

0.8.6

Re: S32K144 UART Callback

B46399 — Mon, 11 Mar 2019 14:01:08 GMT

Hi,

Indeed there was a problem with callbacks in that release, but that's very old. The latest drop is RTM 3.0.0, I suggest updating to the latest version.

Vlad

Re: S32K144 UART Callback

547416104 — Sun, 06 Nov 2022 12:22:40 GMT

The uart rx ISR flag is auto cleared after read the rx data register, so need you to read the data register.