nuttx/arch/arm
David Sidrane 8b9d05d0f7 s32k1xx:Serial overcome race where DMA has not fetched TCD again"
With TCD set to loop, there is a window where the
   DMA has raised Done, but not reloaded the TCD, resetting
   count and clearing Done.

   In this window  imxrt_dmach_getcount could then return 0.
   Resulting in imxrt_dma_nextrx returning RXDMA_BUFFER_SIZE.
   Which is not a valid index in the FIFO.

   Since the count will be set to RXDMA_BUFFER_SIZE. When the DMA
   engine completes the TCD reload. The imxrt_dma_nextrx would
   return 0. Therefore:

    (RXDMA_BUFFER_SIZE - dmaresidual) % RXDMA_BUFFER_SIZE

   accomplishes this.
2023-10-27 22:24:27 +08:00
..
include add gd32f470i board support 2023-10-21 11:45:03 -03:00
src s32k1xx:Serial overcome race where DMA has not fetched TCD again" 2023-10-27 22:24:27 +08:00
CMakeLists.txt
Kconfig arch: add a flag indicating that the chip doesn't support DMA transfer from/to FLASH 2023-09-29 21:04:02 +08:00