Hello, Kan
It is working now. I was suspicious about the "LPSCI_HAL_Getchar" function call in "LPSCI_DRV_IRQHandler". As said in my last message, whenever this function is called, it hangs, untill falls into a "Default_ISR".
I confirmed what I suspected, when I simply commented this function call and inserted the following code in place:
"lpsciState->rxBuff = UART0_D;"
In other words, I included exactly the same line that is inside "LPSCI_HAL_Getchar" function.
So, there may be a kind of strange bug that doesn't allow the correct call and execution of this function.
Your tips were very helpful. I had to add some code, like increasing the "lpsciState->rxSize" after receving the last character. That was a way I found to set "Receive Status" back to "kStatus_LPSCI_RxBusy" and therefore, to avoid sending the last typed character back to Terminal eternally. My test is a echo, so I want the character typed on Terminal to be sent back to PC only once. I don't know if there is a more correct way to do this.
Bellow, you see the modifications I did in the code that I originally attached to this discussion. The changes were in main.c (main loop), Events.c (RxCallBack function) and in fsl_lpsci_driver.c (LPSCI_DRV_IRQHandler function). It was tested on FRDM-KL25Z and I used OpenSDA Virtual COM for communication.
Thanks you very much and best regards,
Marco Coelho
Hi Ningning,
I just checked the thread you mentioned, and think maybe you have some misunderstanding with the callback function in sdk 1.2, if you refer to Kinetis SDK v.1.2.0 API Reference Manual.pdf, you may find a statement for the kind of InstallTx/RxCallback() function:
so it is not a sdk issue, it is what callback should do when callback function is enabled.
Have a great day,
Kan
Freescale Technical Support
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Hi Marco Coelho,
LPSCI_DRV_ReceiveData() is designed to receive data in the application layer, while RxCallback function is called in the ISR, so it is not the correct way to put this api in the callback function, and the LPSCI_DRV_ReceiveData() is a non-blocking function, it returns immediately after being called, so it would waste too much of time, and the user application/main() may use LPSCI_DRV_GetReceiveStatus() to check if the receiving is done, otherwise main() can handle other tasks during the receiving.
An alternative way is to use RTOS like MQX , FreeRTOS and something like that, you may split main() into multiple small tasks , when receiving task is pending, other tasks may have the CPU to do something. The KSDK 1.2 provides OSA layer for such kind of purpose , you may select the RTOS that you are familiar with.
Please kindly let me know if you have any issue.
Have a great day,
Kan
Freescale Technical Support
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Hi, Kan
Great! Your solution really works! I made some mistakes. I thought "LPSCI_DRV_ReceiveData" function should not be used in Interrupt driven mode and I supposed this could be causing the failure.
I came back to the old code in main loop, by calling "LPSCI_DRV_ReceiveData" function and checking the LPSCI Status. And when this function is called in main loop, I don't have to access ((lpsci_state_t *)uartState)->rxBuff and store it in my rx_data variable inside RxCallBack function anymore.
I also understood it is not necessary to define a "User Parameter" and "Rx buffer", as well. So I disabled them in lpsci bean.
After that, in LPSCI_DRV_ISR_Handler, I commented the line:
| // | lpsciState->rxBuff = UART0_D; |
and uncommented the line:
LPSCI_HAL_Getchar(base, lpsciState->rxBuff);
So, its original content is back and no more hanging and no more Default_ISR!
And, now, everything is working perfectly!
Thank you very much for your support, Kan!
Regards,
Marco Coelho
