Hi @dragostoma ,
Thank you for your reply.
I think I still need help.
I referred to the link and configured these in my S32 config tool, but I can't tell if this is correct for the UART DMA configuration.
1. MCU-> MCL General Congiuration -> Enable DMA
2. MCU-> MCL Specific Congiuration -> Dma Logic Instance
3. MCU-> MCL Specific Congiuration -> Dma Logic Channel
4. Uart-> General Congiuration -> Uart DMA Enable
5. Uart-> UartGlobal Config -> Tx DMA channel & Rx DMA channel config
I know that I can initialize functions in Simulink through Model Header and System Initialize.
However, I don't know how to implement DMA. I think I need a example project.
By the way, I can't find any documentation explaining what each function does.
I don't know what function I should use to achieve what I want.
Could you please provide it?
Thank you.
Hi, @SuperBeginner,
The documentation you need, with explanations of each function and how to use them, can be found at the following path:
toolbox_root/S32K3_RTD/SW32K3_S32M27x_RTD_R21-11_4.0.0_P19/eclipse/plugins/Mcl_TS_T40D34M40I0R0
At this location you can find the following:
- in doc folder you can find RTD_MCL_UM.pdf file, which is the User Manual for the MCL driver;
- in include folder you can find CDD_Mcl.h file, which is the main header file for the MCL driver;
- in src folder you can find CDD_Mcl.c file, which is the main source file for the MCL driver.
Based on the documentation above, you can understand the functionalities of each function, what parameters it has and how to use it in your application using custom code.
Now related to your application, until the next version of the toolbox is released, which will contain example models using DMA, I can guide you with the application you are trying to implement.
1. RM tab
In order to implement a DMA transfer, it will be necessary to add the RM (Resource Manager) component, to be able to set the DMA source.
Let's assume that we chose the LPUART 3 instance. We will create a configuration each for TX and RX, to ensure that we set the DMA MUX Source based on the chosen LPUART instance.
It should be noted that this newly added Rm component must be initialized in the Board initialization.
2. MCL tab
The MclDma must be enabled.
A logic instance must be assigned.
And the logic channels must be set, for both TX and RX.
The Hardware Channel must be the same as the one set in the Rm component, at Dma Hardware Channel (DMA_CHANNEL_16 and DMA_CHANNEL_17).
For UART using DMA, the interrupt callbacks are already defined based on the LPUART instance, so in this case must be used Lpuart_3_Uart_Ip_DmaTxCompleteCallback and Lpuart_3_Uart_Ip_DmaRxCompleteCallback.
The Enable Global Config check enabled the Global tab usage, where it should be enabled the DMA Request.
3. MCU tab
The corresponding peripheral clocks must be enabled.
4. PORT tab
The RX and TX pins must be enabled for the LPUART 3 instance.
5. PLATFORM tab
The corresponding interrupts must be enabled.
It should be mentioned that the interrupt corresponding to LPUART 3 should not be enabled, because the data transfer will be done through DMA, and the interrupts will be triggered based on the chosen TCDs and RX and TX callbacks.
6. UART tab
The DMA must be enabled.
You should check also the Uart Timeout Duration according to your application.
It should be mentioned that for this demonstration we chose LPUART 3 arbitrarily, and that any other instance can be used. Keep in mind that a USB2Serial Converter is needed for this instance, because the RX and TX pins are not directly connected to OpenSDA, as in the case of LPUART 6. If you want to use LPUART 6, the UBS2Serial Converter is no longer needed.
You can use the Simulink model from the Async UART example and it should work correctly for the previously configured LPUART instance. For the Hardware Interrupt Callback part, the model will use the same UART callback that will manage the data transfer through DMA.
Let me know if you managed to configure the UART using DMA.
Hope this helps,
Dragos
Hi @dragostoma ,
Thank you for your reply.
I have a question during the setting process, which is about the setting of DMA Hardware Channel.
Referring to the picture you provided, you selected ch16 and ch17.
But I don't see the channel in the s32config tool.
I'm worried that this channel setting will be related to the selected uart, but I didn't see the relevant guidance in the user manual.
Do you have any suggestions?
In addition, can you provide me with an example of using this dma setting on simulink?
I have been researching for a long time and still have no clue.
I just need to simply blink the LED when receiving characters.
I'll work on the rest by myself, thank you
Hi, @SuperBeginner,
The reason why the number of channels differs is because in my example I used a different hardware board, namely S32K344. The number of channels differs depending on each hardware board. I chose to use in the presented example an instance and some arbitrarily chosen DMA channels, just for demonstration purposes, but you can choose any instance available on the hardware board you own.
Dma Hardware Instances are divided so that either Dma Mux Source 0 or Dma Mux Source 1 can be used. In the example shown, Dma Mux Source 1 is used. You can also use the same source, choosing hardware channels from the second half of the list .
The LPUART instances available for each individual source differ and depending on your application and the availability of the LPUART instances, you can choose Dma Mux Source accordingly:
DMA MUX 0: LPUART_0, LPUART_1
DMA MUX 1: LPUART_2, LPUART_3, LPUART_4, LPUART_5, LPUART_6, LPUART_7
Whichever instance and channels you choose, make sure you maintain consistency with regards to the DMA configuration.
Based on the information provided, you should be able to configure the UART data transmission functionality using DMA.
Best regards,
Dragos
Hi @dragostoma ,
I followed your instructions and tried to configure DMA, but was unable to refresh the program.
It always show this error message.
Currently, I am using the sample project "s32k3xx_uart_buffer_s32ct" to try to set up the DMA of LPUART 3.
I found that just adding "Rm_tab" in the S32 configuration tool and updating the code caused the error to occur.
Although I did not configure anything in Rm_tab and Borad was not initialized when it was initialized, the above error message popped up immediately.
Of course, this also happens if I follow the Borad initialization steps you provided.
Can you give me some advice?
In addition, I want to apologize because English is not my native language. I have some questions about your suggestion
I saw you mentioned "You can use the Simulink model from theAsync UARTexample and it should work correctly for the previously configured LPUART instance. For the Hardware Interrupt Callback part, the model will use the same UART callback that will manage the data transfer through DMA."
Do you mean that I just follow the Example project to complete the block configuration?
For example, enable the uart channel of lpuart 3 in the initialize function.
Than, change all uart channels to lpuart 3. I can implement DMA.
Is this your meaning?
Thank you for your reply.
Hi, @SuperBeginner,
The steps you followed, at first glance, seem correct, with a small exception that I don't know if it's just from the screenshot, but make sure you don't have any spaces in the name of the interrupt handlers, because that's what it looks like from the picture sent.
The model and its configuration could also help us to test and see if the error is reproduced in our case.
Thanks,
Dragos
Hi, @SuperBeginner,
I downloaded your archive and tried to open the model. First of all, I notice that you mention that you are using toolbox version 1.5.0 which uses RTD version 4.0.0 P19. When I try to open the model, the model migration pop-up appears, notifying me that the version of RTD has changed from 3.0.0 (corresponding to toolbox version 1.4.0) to 4.0.0 (corresponding to the latest version of toolbox, 1.5.0).
This indicates that there is a problem somewhere and you are actually using an earlier version of the toolbox. As I mentioned before, various problems can arise from here if the toolbox versions interfere with each other.
The same thing can be seen from the settings you are trying to configure in Hardware Settings, which denotes the use of a previous toolbox version (1.4.0
- your settings:
- the 1.5.0 toolbox settings:
- your settings:
- the 1.5.0 toolbox settings:
- your settings:
- the 1.5.0 toolbox settings:
So, the general idea and the conclusion we can draw is that you are actually using an older version of the toolbox, which can cause the problems you encounter. Or if that's what you want, to use version 1.4.0, that's what you have to mention, just like the version of MATLAB you're using and that caused us problems in previous threads. It is important to mention because the workflows differ according to each version. The steps I presented are for the latest version of toolbox, 1.5.0.
Let us know about the progress made.
Best regards,
Dragos
Dear @dragostoma ,
Thanks for explaining the version differences between MBDT 1.4 and 1.5.0.
I will definitely explain my environment in detail in the future.
In addition, regarding DMA configuration issues, I can't open the model you provided.
It always shows this error message.
However, I followed your instructions to configure the S32 Config Tool, that is, the deletion of the Port component and its initialization from the board init.
I can successfully building the program to s32k312evb-q172.
Than, I used the USB2Seraial Converter and connected it to the TX and RX pins on the board.
That is, USB_Converter_TX is connected to PTE15 PIN (J3.21), USB_Converter_RX is connected to PTE15 PIN (J3.18), USB_Converter_GND is connected to GND (J39.19).
After establishing these connections, I communicated using the serial communication tool (for example PuTTY), but the UART communication failed.
No characters from LPUART 3 will appear in my monitor window.
I've attached my program here, could you figure out the problem, please?
Thanks in advance
