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Fix SDIO DMA (finally) 

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4409 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-02-21 19:16:41 +00:00
parent 9eda27ba2a
commit b9cb4b0df3
4 changed files with 24 additions and 6 deletions
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4
ChangeLog
View File

@ -2473,3 +2473,7 @@
The received buffer size must be two bytes larger to account for the two byte
checksum that is appended to the packet. Otherwise, the last two bytes of
real data in the packet will get clobbered.
* arch/arm/src/stm32f40xx_dma.c: The STM32 F4 DMA has (finally) been verified
* arch/arm/src/stm32_sdio.c: STM32 F4 SDIO DMA is now supported
* configs/stm3240g-eval/nsh/defconfig: This configuration now supports SDIO
with DMA (see configs/stm3240g-eval/README.txt for some issues).

2
arch/arm/src/stm32/stm32_sdio.c
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@ -119,7 +119,7 @@
# if defined(CONFIG_STM32_STM32F10XX)
# define CONFIG_SDIO_DMAPRIO DMA_CCR_PRIMED
# elif defined(CONFIG_STM32_STM32F40XX)
# define CONFIG_SDIO_DMAPRIO DMA_SCR_PRIMED
# define CONFIG_SDIO_DMAPRIO DMA_SCR_PRIVERYHI
# else
# error "Unknown STM32 DMA"
# endif

14
configs/stm3240g-eval/README.txt
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@ -720,9 +720,23 @@ Where <subdir> is one of the following:
configuration.
2. RS-232 is disabled, but Telnet is still available for use as a console.
Since RS-232 and SDIO use the same pins (one controlled by JP22), RS232
and SDIO cannot be used concurrently.
3. This configuration requires that jumper JP22 be set to enable SDIO operation.
4. In order to use SDIO without overruns, DMA must be used. The STM32 F4
has 192Kb of SRAM in two banks: 112Kb of "system" SRAM located at
0x2000:0000 and 64Kb of "TCM" SRAM located at 0x1000:0000. It appears
that you cannot perform DMA from TCM SRAM. The work around that I have now
is simply to omit the 64Kb of TCM SRAM from the heap so that all memory is
allocated from System SRAM. This is done by setting:
CONFIG_MM_REGIONS=1
Then DMA works fine. The downside is, of course, is that we lose 64Kb
of precious SRAM.
ostest:
------
This configuration directory, performs a simple OS test using

10
configs/stm3240g-eval/nsh2/defconfig
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@ -90,7 +90,7 @@ CONFIG_ARCH_BOOTLOADER=n
CONFIG_ARCH_LEDS=y
CONFIG_ARCH_BUTTONS=n
CONFIG_ARCH_CALIBRATION=n
CONFIG_ARCH_DMA=n
CONFIG_ARCH_DMA=y
#
# Identify toolchain and linker options
@ -127,7 +127,7 @@ CONFIG_STM32_CRC=n
CONFIG_STM32_BKPSRAM=n
CONFIG_STM32_CCMDATARAM=n
CONFIG_STM32_DMA1=n
CONFIG_STM32_DMA2=n
CONFIG_STM32_DMA2=y
CONFIG_STM32_ETHMAC=y
CONFIG_STM32_OTGHS=n
# AHB2:
@ -500,7 +500,7 @@ CONFIG_DEBUG_CAN=n
CONFIG_DEBUG_I2C=n
CONFIG_DEBUG_DMA=n
CONFIG_HAVE_CXX=y
CONFIG_MM_REGIONS=2
CONFIG_MM_REGIONS=1
CONFIG_ARCH_LOWPUTC=y
CONFIG_RR_INTERVAL=200
CONFIG_SCHED_INSTRUMENTATION=n
@ -598,7 +598,7 @@ CONFIG_DISABLE_SIGNALS=n
CONFIG_DISABLE_MQUEUE=n
CONFIG_DISABLE_MOUNTPOINT=n
CONFIG_DISABLE_ENVIRON=n
CONFIG_DISABLE_POLL=y
CONFIG_DISABLE_POLL=n
#
# Misc libc settings
@ -782,7 +782,7 @@ CONFIG_FS_WRITEBUFFER=n
# CONFIG_MMCSD_HAVECARDDETECT
# SDIO driver card detection is 100% accurate
#
CONFIG_SDIO_DMA=n
CONFIG_SDIO_DMA=y
#CONFIG_SDIO_PRI=128
#CONFIG_SDIO_DMAPRIO
#CONFIG_SDIO_WIDTH_D1_ONLY