2023-12-30 12:03 AM
I'm trying to implement a SPI transfer between flash and SPI2 - a simple display. I'm using LL everywhere.
No problem with M3 and M4 - But GPDMA is completely different. "Normal" SPI work but no way to enable DMA.
Based on the only example with LL (All the examples are flash to ram only!). I wrote this:
LL_DMA_SetSrcAddress(GPDMA1, LL_DMA_CHANNEL_0, (uint32_t)&icon1);
LL_DMA_SetDestAddress(GPDMA1, LL_DMA_CHANNEL_0, LL_SPI_DMA_GetTxRegAddr(SPI2));
LL_DMA_SetBlkDataLength(GPDMA1, LL_DMA_CHANNEL_0, icon1_size_byte);
/* Enable DMA transfer complete/error interrupts */
LL_DMA_EnableIT_TC(GPDMA1, LL_DMA_CHANNEL_0);
LL_DMA_EnableIT_DTE(GPDMA1, LL_DMA_CHANNEL_0);
/* Start the DMA transfer Flash to Memory */
LL_DMA_EnableChannel(GPDMA1, LL_DMA_CHANNEL_0);
Icon size is about 2kB. Unfortunately no interrupt occours.
I'll hope that some example will be added on the next H5 update (HAL &LL).
Any suggestions?
2023-12-30 07:46 AM - edited 2023-12-30 07:49 AM
But GPDMA is completely different - that already took me some hours.
Here example, how to write the magic "list" , for dma -> SAI tx + rx :
But with HAL ...+ i got it working . 🙂
2023-12-30 08:52 AM
Thanks Kudos.
Just a quick glance, but seems very hard... for the LL and flash to RAM only a couple of commands 🤔
But... The LLI (Linked List) seems very complicate and hard to understand. Are they necessary for this case?
I will study the code again, but on M3/M4 was easiest.
2023-12-30 09:09 AM - edited 2023-12-30 09:12 AM
Linked List is not necessary, the dma has an "standard mode" :
But - i didnt get it working....so i tried the list-mode from the example and it worked as it should.
M3/M4 was more easy, also on H7 i had no problems. It seems, STM wants to raise the bar ...
2024-01-05 01:49 AM - edited 2024-01-05 02:03 AM
Hello @TheRaprus,
>>I'll hope that some example will be added on the next H5 update (HAL &LL).
Thank you for the suggestion, LL examples of SPI with DMA (master and slave) will be added soon
This request is tracked internally (Ticket 164113).
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