Kinetis Microcontrollers中的主题 Re: MKE1xF512VLH16 lpuart RX interrupt

MKE1xF512VLH16 lpuart RX interrupt

shar2021 — Mon, 28 Mar 2022 20:17:21 GMT

Hello,

I have to implement a callback function for RX. I have a variable command which will be sent from terminal. For eg , in this data block can be 1 byte or 200 bytes and rest are fixed.

STX , Address, SEQ Number, DataBlock(n), ETX, CRC.

I am using Ring buffer method.

For now i am using the sample example of twrke18f_lpuart_interrupt_rb_transfer. The buffer is fixed to 8 , so it receives only 8 bytes.

sendXfer.data = g_txBuffer;
sendXfer.dataSize = ECHO_BUFFER_SIZE;
receiveXfer.data = g_rxBuffer;
receiveXfer.dataSize = ECHO_BUFFER_SIZE;

I do get a complete data

02 0x31 0x31 Z 0x03 0xCRC

I can not get variable frame ,For my example how do i trigger call back when ETX is received without depending on the size as above.

Attaching code files.

Please help with expert guidance

Re: MKE1xF512VLH16 lpuart RX interrupt

Robin_Shen — Tue, 29 Mar 2022 04:50:45 GMT

Hi shar2021,

Check the IDLE of "48.3.1.7 LPUART Status (STAT)".

You can enable the Idle Line Interrupt by ILIE of 48.3.1.8 LPUART Control (CTRL).

Best Regards,
Robin
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Re: MKE1xF512VLH16 lpuart RX interrupt

shar2021 — Tue, 29 Mar 2022 05:15:05 GMT

Hello @Robin_Shen ,

Thanks for response. I have question, Can ring buffer concept be used for variable length packet? I tried the interrupt mode too instead of ring buffer, I was unable to receive variable length packets.

Do you have any example for variable length frame?

Thanks

Re: MKE1xF512VLH16 lpuart RX interrupt

Robin_Shen — Fri, 15 Apr 2022 08:45:14 GMT

Sorry for the delay!
Have you test the twrke18f_lpuart_edma_rb_transfer?