kywwilson11 opened a new pull request, #16776:
URL: https://github.com/apache/nuttx/pull/16776
## Summary
stm32_serial.c -
1. Removed incompatible defines left over from STM32L4 implementation. L4
was used as a reference.
2. Removed DMAMAP defines. STM32H5 uses DMA requests.
3. Replaced rxdma_channel with rxdma_req.
4. Other adaptations to work with stm32h5 gpdma driver. Used the STM32H7
serial driver as a reference when developing.
stm32_uart.h - Remove warning and allow SERIAL_HAVE_DMA1 to be assigned to
1.
stm32h56x_dmasigmap.h - Changed UART10 and UART11 to USART10 and USART11
stm32_dma.c - Added stm32_dmaresidual - This returns the number of beats
remaining in the dma transfer. Used in serial dma driver.
## Impact
STM32H5 Architecture. Serial Driver and minor changes / additions to GPDMA
driver.
Note: There is some flow control logic in the dma functions, but that has
not been tested yet. A compiler warning will display if
CONFIG_SERIAL_IFLOWCONTROL is defined.
## Testing
OS: Ubuntu 24.04
Configuration: nucleo-h563zi:nsh + Enable DMA1 + Enable USART3 RX DMA
Used RXDMA_BUFFER_SIZE of 32 bytes
Admittedly, testing is minimal. The test below is just me typing in
characters. After typing every 16 characters, I would see the characters
displayed to the screen. This made sense because the buffer was 32-bytes and I
am using half transfer interrupts in circular dma mode. I also copied and
pasted large sections of text into the console and confirmed they showed up in
the console.
I also tested by debugging with GDB. I confirmed the dma setup, callback,
receive, and supporting functions were all performing as expected. I've
attached an image of a call stack to show dmareceive being accessed.
If the reviewers have any suggestions for better test methods, I would be
interested.
```
NuttShell (NSH) NuttX-12.10.0
nsh> abcdefghijklmnopqrstuvwxyz012345
```
<img width="546" height="334" alt="Screenshot 2025-07-25 152437"
src="https://github.com/user-attachments/assets/eb6d8302-13fa-4ef5-90bc-c4310daf6143";
/>
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