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STM32F7 serial: Allow configuring Rx DMA buffer size

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This commit is contained in:
Jussi Kivilinna 2017-05-04 07:09:19 -06:00 committed by Gregory Nutt
parent acf0d17e5a
commit 7035723aeb
2 changed files with 32 additions and 5 deletions
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12
arch/arm/src/stm32f7/Kconfig
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@ -1614,6 +1614,18 @@ config UART8_RXDMA
---help---
In high data rate usage, Rx DMA may eliminate Rx overrun errors
config STM32F7_SERIAL_RXDMA_BUFFER_SIZE
int "Rx DMA buffer size"
default 32
depends on USART1_RXDMA || USART2_RXDMA || USART3_RXDMA || UART4_RXDMA || UART5_RXDMA || USART6_RXDMA || UART7_RXDMA || UART8_RXDMA
---help---
The DMA buffer size when using RX DMA to emulate a FIFO.
When streaming data, the generic serial layer will be called
every time the FIFO receives half this number of bytes.
Value given here will be rounded up to next multiple of 32 bytes.
config SERIAL_DISABLE_REORDERING
bool "Disable reordering of ttySx devices."
depends on STM32F7_USART1 || STM32F7_USART2 || STM32F7_USART3 || STM32F7_UART4 || STM32F7_UART5 || STM32F7_USART6 || STM32F7_UART7 || STM32F7_UART8

25
arch/arm/src/stm32f7/stm32_serial.c
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@ -159,15 +159,30 @@
/* The DMA buffer size when using RX DMA to emulate a FIFO.
*
* When streaming data, the generic serial layer will be called
* every time the FIFO receives half this number of bytes.
* When streaming data, the generic serial layer will be called every time
* the FIFO receives half this number of bytes.
*
* This buffer size should be an even multiple of the Cortex-M7
* D-Cache line size so that it can be individually invalidated.
* This buffer size should be an even multiple of the Cortex-M7 D-Cache line
* size, ARMV7M_DCACHE_LINESIZE, so that it can be individually invalidated.
*
* Should there be a Cortex-M7 without a D-Cache, ARMV7M_DCACHE_LINESIZE
* would be zero!
*/
# if !defined(ARMV7M_DCACHE_LINESIZE) || ARMV7M_DCACHE_LINESIZE == 0
# undef ARMV7M_DCACHE_LINESIZE
# define ARMV7M_DCACHE_LINESIZE 32
# endif
# if !defined(CONFIG_STM32F7_SERIAL_RXDMA_BUFFER_SIZE) || \
(CONFIG_STM32F7_SERIAL_RXDMA_BUFFER_SIZE < ARMV7M_DCACHE_LINESIZE)
# undef CONFIG_STM32F7_SERIAL_RXDMA_BUFFER_SIZE
# define CONFIG_STM32F7_SERIAL_RXDMA_BUFFER_SIZE ARMV7M_DCACHE_LINESIZE
# endif
# define RXDMA_BUFFER_MASK (ARMV7M_DCACHE_LINESIZE - 1)
# define RXDMA_BUFFER_SIZE ((32 + RXDMA_BUFFER_MASK) & ~RXDMA_BUFFER_MASK)
# define RXDMA_BUFFER_SIZE ((CONFIG_STM32F7_SERIAL_RXDMA_BUFFER_SIZE \
+ RXDMA_BUFFER_MASK) & ~RXDMA_BUFFER_MASK)
/* DMA priority */