S32KのトピックS32K144 SDKRTM3.0 FlexCAN Rx using FIFO callback and lpuart tx

S32K144 SDKRTM3.0 FlexCAN Rx using FIFO callback and lpuart tx

wdong — Tue, 29 Sep 2020 07:46:54 GMT

Dear， I am using S32K144 SDK RTM3.0，with FlexCAN and LPUART module，when I recieve can Msg, then tx using lpuart1, my problem:

1) I cant tx data twice using lpuart

2) I cant using the global varible in the while(1) loop

attachment is my project,thank you first

Re: S32K144 SDKRTM3.0 FlexCAN Rx using FIFO callback and lpuart tx

Omar_Anguiano — Wed, 30 Sep 2020 20:01:55 GMT

Hello wdong

The function LPUART_DRV_SendData() is a non-blocking function, this means that the when you execute another function the transmission will be still on course. To avoid this you may check if the bus is busy before calling the second TX or use the function LPUART_DRV_SendDataBlocking().

The LPUART_DRV_SendDataBlocking() does not return until the transmit is complete.

Could you explain in detail the point 2? ("I cant using the global variable in the while(1) loop")

Let me know if this is helpful, if you have more questions do not hesitate to ask me.

Best regards,

Omar

Re: S32K144 SDKRTM3.0 FlexCAN Rx using FIFO callback and lpuart tx

wdong — Sat, 10 Oct 2020 01:38:08 GMT

Thank you, your solution is helpful. As for the second problem, I already know how to do. One must use volatile before the global value, so it can be used in the while(1) loop.

Re: S32K144 SDKRTM3.0 FlexCAN Rx using FIFO callback and lpuart tx

wdong — Sat, 10 Oct 2020 01:57:52 GMT

sorry, it is "volatile"