About GStee.2

GStee.2 · 2022-10-19

We are currently seeing issues while trying to get UART communication working : we have have 2 stm32h7 (STM32H753) boards connected via RS-232. On board 1 we are sending 4kB of data each second and on board 2 we are receiving this data.Tx on board 1 ...

GStee.2 · 2022-10-26

Hi @Community member We have also tried with bigger DMA buffers but that didn't help. Both during half/complete transfer interrupt we will call our own written callback function and this function copies data from the DMA memory buffer to an applicat...

GStee.2 · 2022-10-23

Hi F.Belaid,We did apply setting bit 20 of the DMA_SxCR (it was not clear to me from the errata if this was only needed for tx/rx so we we tried all possible combinations). It did however not solve the issue. So in case of STM32H753 it also doesn' s...

GStee.2 · 2022-10-20

After some more testing I noticed that the issue only occurs when tx and rx are happening at the same time. When there is no overlap between tx and rx the test can run without any issues. When tx and rx overlap (even for a very short period of time) ...

GStee.2 · 2022-10-20

We are not using circular DMA (so direct mode is used). By using a counter we found out that our rx callback was still being called but not handled properly as we went to a 512 DMA buffer but our length/position was still being expressed in byte form...

GStee.2 · 2022-10-19

Ok but in case of reception errors I would expect that these also showed up when using a DMA RX buffer size of 256 instead of 512 but this wasn't the case. We did measure cpu load in both cases and it was very low (as expected as only our test task i...

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STM32H7 UART DMA TX/RX issues

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