HI,
I encountered some problems when using [model-based Design Toolbox for MPC57xx Automotive Version 3.0.0/Communication Blocks/UART Blocks/ UART_Receive], as shown in the figure.
Set the Data size to 8; After receiving the data, extract the data Uart_DataRcv[2] for subsequent processing.
However, the error in compile time indicates that the received data index cannot be greater than 0, that is, it is not an array. Is there any BUG in this module?
It is hoped that modules supporting LIN protocol will be provided later.
Thank you very much!
Hello lujia@dfmc.com.cn,
So let's talk about the switch block:
In this example you can see we have 1 selector (top Constant block - value 2) and 2 input signals (values 4 and 5). If we take a look at the mask of the switch block, we can see the Data port order is set to 1-based contiguous. This means the selector will have values between 1 and the number of data ports (in our case, 2). This works in the following way:
| Selector input | Switch block output |
|---|---|
| 1 | 4 |
| 2 | 5 |
If we would have have 0-based contiguous selected, the values would have been between 0 and 1 for the selector.
In your example, you only have 1 data port, and the order is set to 0-based contiguous. This means the selector can have values between 0 (starting position for 0-based indexing) and 0 (number of data ports - 1, that is 1-1=0). So this is why Simulink issues that error.
Let me know what you are trying to achieve with these switches and I can help.
Another thing I want to mention - I'm not sure where you took the UART configuration block, but you have to delete it and put it in the model again, because it is not linked with the one from within our library. I'm not sure what happened there.
Let me know if you're still facing issues with this.
Kind regards,
Razvan.
Hi:
Thank you for reply!
I want to extract data through [multi-port Switch Block] after [Receive_Block] receives LIN data and implement the logic of LIN protocol.
As described in the help document, if [size] is set to 8, the output [data] should be an array of size 8.
In other words, the output [data] is Uart_DataRcv[8].
After receiving Uart_DataRcv[8], [multi-port Switch Block] was used to extract the array to realize the logic of LIN protocol.
The problem is that even if I set [size] to 8, the output from [Receive_Block] will not be an array of size 8, but a UINT8. This will result in a failure to extract through [multi-port Switch Block] and a compilation error. So I'm guessing there's a BUG in [Receive_Block].
