stm32:Serial DMA buffer round off not up

2017-05-08 15:54:03 +00:00 · 2017-05-08 15:54:03 +00:00 · 546e7acb99
commit 546e7acb99
parent c64983dbeb
1 changed files with 3 additions and 1 deletions
--- a/arch/arm/src/stm32/stm32_serial.c
+++ b/arch/arm/src/stm32/stm32_serial.c
@ -186,8 +186,10 @@
 #    define CONFIG_STM32_SERIAL_RXDMA_BUFFER_SIZE 32
 #  endif
 #  define RXDMA_MUTIPLE  4
+#  define RXDMA_MUTIPLE_MASK  (RXDMA_MUTIPLE -1)
 #  define RXDMA_BUFFER_SIZE   ((CONFIG_STM32_SERIAL_RXDMA_BUFFER_SIZE \
-                                + RXDMA_MUTIPLE) & ~(RXDMA_MUTIPLE-1))
+                                + RXDMA_MUTIPLE_MASK) \
+                                & ~RXDMA_MUTIPLE_MASK))

 /* DMA priority */