Using LwIP on the STM32H7
Gedare Bloom
gedare at rtems.org
Fri Jan 29 19:21:55 UTC 2021
On Fri, Jan 29, 2021 at 9:57 AM Robin Müller <robin.mueller.m at gmail.com>
wrote:
> The whole code base I'm using might go public soon so I will also send the
> link here
> as soon as it is. I think this might also be useful for people who would
> like to evaluate how to set up Eclipse and the CMake build system for
> their application
>
> Kind Regards
> Robin
>
> This will be greatly appreciated, thank you. Glad you got it working, and
in relatively short order!
> On Fri, 29 Jan 2021 at 17:47, Robin Müller <robin.mueller.m at gmail.com>
> wrote:
>
>> Alright, I figured out the issue, that was an application level problem,
>> the UDP frames are received and sent without issues as far as I can see.
>> I think I might submit a patch soon with some of initial improvements.
>> But I will summarize the changes I had to do here for now in case other
>> people want to
>> use lwIP, based on the example application provided by STM.
>>
>> *BSP Changes:*
>>
>> *Inside bsps/arm/stm32h7/start/bspstart.c:*
>>
>> I changed the HAL_GetTick() function, which returned 0 previously to
>> return the tick count by default:
>>
>> uint32_t HAL_GetTick(void)
>> {
>> return rtems_clock_get_ticks_since_boot();
>> }
>>
>> I'm not sure whether there was a specific reason to have it return 0 by
>> default, but that led to some issues because this function is generally
>> called by the
>> HAL or by example applications and it's a lot of hassle to replace every
>> call with rtems_clock_get_ticks_since_boot()
>>
>> *bsps/arm/shared/start/linkcmds.base:*
>>
>> I added following section to the linker file.
>> This is a really ugly solution because this file is used by all ARM bsps.
>> I might look into how to make it stm32h7 specific, but it worked for me now
>> because
>> I only have the STM32H7
>>
>> /* Ugly solution for now */
>> .lwip_sec (NOLOAD) : ALIGN_WITH_INPUT {
>> . = ABSOLUTE(0x30040000);
>> *(.RxDecripSection)
>> . = ABSOLUTE(0x30040060);
>> *(.TxDecripSection)
>> . = ABSOLUTE(0x30040200);
>> *(.RxArraySection)
>> } >SRAM_3 AT> REGION_TEXT_LOAD
>>
>>
>>
>> *bsps/arm/stm32h7/hal/stm32h7xx_hal_eth.c:*
>> On line 364 in *HAL_ETH_Init*, comment out the preprocessor guards to
>> set the DSL to 64bit. I don't know what this line exactly does yet, but it
>> was necessary
>> to get lwIP to work properly.
>>
>> #ifndef __rtems__
>> /* SET DSL to 64 bit */
>> MODIFY_REG(heth->Instance->DMACCR, ETH_DMACCR_DSL,
>> ETH_DMACCR_DSL_64BIT);
>> #endif /* __rtems__ */
>>
>> On line 2648 in *ETH_DMATxDescListInit *comment the preprocessor guard
>> so that the function is executed. This is necessary
>> so the DMA descriptors are set up properly.
>>
>> Do the same for *ETH_DMARxDescListInit* starting at line 2687.
>>
>> I think that was all. Hope it helps some people
>>
>> Kind Regards
>> Robin Müller
>>
>>
>>
>> On Fri, 29 Jan 2021 at 15:45, Robin Müller <robin.mueller.m at gmail.com>
>> wrote:
>>
>>> I think I might have found one issue. In the
>>> HAL_ETH_Init(ETH_HandleTypeDef *heth) function
>>>
>>> The following piece of code was excluded:
>>>
>>> #ifndef __rtems__
>>> /* SET DSL to 64 bit */
>>> MODIFY_REG(heth->Instance->DMACCR, ETH_DMACCR_DSL,
>>> ETH_DMACCR_DSL_64BIT);
>>> #endif /* __rtems__ */
>>>
>>> I reintroduced the line and now I have been able to receive UDP frames
>>> and send some back. I am still missing some frames, but at least it's
>>> working now.
>>> I might look into how to put the lwIP section in a separate linkcmd file
>>> once I have figured out why some frames are missing, but the way I see it,
>>> it is driver specific (STM used SDRAM3 for the required lwIP memory. One
>>> way would be to add an option in the config.ini like STM32H7_USE_LWIP and
>>> then
>>> load those additional sections for lwIP.
>>>
>>> Kind Regards
>>> Robin
>>>
>>> On Fri, 29 Jan 2021 at 14:18, Joel Sherrill <joel at rtems.org> wrote:
>>>
>>>>
>>>>
>>>> On Fri, Jan 29, 2021, 5:52 AM Robin Müller <robin.mueller.m at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I am actually configuring the MPU with the following function, which
>>>>> was taken over from the STM32 example project:
>>>>>
>>>>> /*Configure the MPU attributes */
>>>>> void MPU_Config(void)
>>>>> {
>>>>> MPU_Region_InitTypeDef MPU_InitStruct;
>>>>>
>>>>> /* Disable the MPU */
>>>>> HAL_MPU_Disable();
>>>>>
>>>>> /* Configure the MPU attributes as Device not cacheable
>>>>> for ETH DMA descriptors */
>>>>> MPU_InitStruct.Enable = MPU_REGION_ENABLE;
>>>>> MPU_InitStruct.BaseAddress = 0x30040000;
>>>>> MPU_InitStruct.Size = MPU_REGION_SIZE_256B;
>>>>> MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
>>>>> MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
>>>>> MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
>>>>> MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
>>>>> MPU_InitStruct.Number = MPU_REGION_NUMBER0;
>>>>> MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
>>>>> MPU_InitStruct.SubRegionDisable = 0x00;
>>>>> MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
>>>>>
>>>>> HAL_MPU_ConfigRegion(&MPU_InitStruct);
>>>>>
>>>>> /* Configure the MPU attributes as Cacheable write through
>>>>> for LwIP RAM heap which contains the Tx buffers */
>>>>> MPU_InitStruct.Enable = MPU_REGION_ENABLE;
>>>>> MPU_InitStruct.BaseAddress = 0x30044000;
>>>>> MPU_InitStruct.Size = MPU_REGION_SIZE_16KB;
>>>>> MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
>>>>> MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
>>>>> MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
>>>>> MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
>>>>> MPU_InitStruct.Number = MPU_REGION_NUMBER1;
>>>>> MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
>>>>> MPU_InitStruct.SubRegionDisable = 0x00;
>>>>> MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
>>>>>
>>>>> HAL_MPU_ConfigRegion(&MPU_InitStruct);
>>>>>
>>>>> /* Enable the MPU */
>>>>> HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
>>>>> }
>>>>>
>>>>> If I read the function correctly, it configures the descriptor areas
>>>>> as non-cacheable and the LwIP heap region
>>>>> as non bufferable. I call this in hardware_init, which is the first
>>>>> function called in my Init funnction
>>>>>
>>>>> void hardware_init() {
>>>>> BSP_LED_Init(LED1);
>>>>> BSP_LED_Init(LED2);
>>>>> BSP_LED_Init(LED3);
>>>>>
>>>>> MPU_Config();
>>>>>
>>>>> /* Initialize the LwIP stack */
>>>>> lwip_init();
>>>>>
>>>>> /* Configure the Network interface */
>>>>> Netif_Config();
>>>>>
>>>>> }
>>>>>
>>>>> I checked everything again and basically the setup appears to be
>>>>> identical to the example now.. I'm confused that it's not working.
>>>>> I also supplied the following interrupt function in my C code:
>>>>>
>>>>> /**
>>>>> * @brief This function handles Ethernet interrupt request.
>>>>> * @param None
>>>>> * @retval None
>>>>> */
>>>>> void ETH_IRQHandler(void)
>>>>> {
>>>>> HAL_ETH_IRQHandler(&EthHandle);
>>>>> }
>>>>>
>>>>> But it appears not to be called..
>>>>>
>>>>
>>>> Is the irq being registered via the RTEMS interrupt APIs? If not and
>>>> you are getting an interrupt, I'd wonder why you aren't seeing a spurious
>>>> interrupt flagged.
>>>>
>>>> It shouldn't be installed directly at the hardware level.
>>>>
>>>> --joel
>>>>
>>>>
>>>>> Kind Regards
>>>>> Robin
>>>>>
>>>>> On Fri, 29 Jan 2021 at 12:03, Sebastian Huber <
>>>>> sebastian.huber at embedded-brains.de> wrote:
>>>>>
>>>>>> On 29/01/2021 12:01, Robin Müller wrote:
>>>>>>
>>>>>> > The HAL_ETH_Transmit call just times out. If I set the timeout to
>>>>>> 20
>>>>>> > to HAL_MAX_DELAY, the function will just block indefinitely.
>>>>>> > Does anyone have an idea why this might happen?
>>>>>> I would check the memory settings in the MPU for this area. You
>>>>>> probably
>>>>>> need some sort of device memory (uncached).
>>>>>>
>>>>>> --
>>>>>> embedded brains GmbH
>>>>>> Herr Sebastian HUBER
>>>>>> Dornierstr. 4
>>>>>> 82178 Puchheim
>>>>>> Germany
>>>>>> email: sebastian.huber at embedded-brains.de
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>>>>>> fax: +49-89-18 94 741 - 08
>>>>>>
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