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| author | Gregory Nutt <gnutt@nuttx.org> | 2013-09-22 12:22:55 -0600 |
|---|---|---|
| committer | Gregory Nutt <gnutt@nuttx.org> | 2013-09-22 12:22:55 -0600 |
| commit | 712c271d829ec46a075d45f9a55abbf3cd958ca7 (patch) | |
| tree | d6bb38935447c851c45fce774e8f78b9c5d13e55 | |
| parent | f1ab340eec49a032bb7adccefc7255cb2ae6b3c4 (diff) | |
| download | nuttx-712c271d829ec46a075d45f9a55abbf3cd958ca7.tar.gz nuttx-712c271d829ec46a075d45f9a55abbf3cd958ca7.tar.bz2 nuttx-712c271d829ec46a075d45f9a55abbf3cd958ca7.zip | |
SAMA5D3x-EK AT25 Serial FLASH: Dropping SPI frequency to 10MHz gives more reliable behavior
| -rw-r--r-- | nuttx/configs/sama5d3x-ek/README.txt | 12 | ||||
| -rw-r--r-- | nuttx/configs/sama5d3x-ek/demo/defconfig | 2 | ||||
| -rw-r--r-- | nuttx/drivers/usbdev/Kconfig | 6 |
3 files changed, 14 insertions, 6 deletions
diff --git a/nuttx/configs/sama5d3x-ek/README.txt b/nuttx/configs/sama5d3x-ek/README.txt index aa455cda9..dd713ac9c 100644 --- a/nuttx/configs/sama5d3x-ek/README.txt +++ b/nuttx/configs/sama5d3x-ek/README.txt @@ -1011,7 +1011,11 @@ Configurations CONFIG_MTD=y : Enable MTD support CONFIG_MTD_AT25=y : Enable the AT25 driver CONFIG_AT25_SPIMODE=0 : Use SPI mode 0 - CONFIG_AT25_SPIFREQUENCY=20000000 : Use SPI frequency 20MHz + CONFIG_AT25_SPIFREQUENCY=10000000 : Use SPI frequency 10MHz + + The AT25 is capable of higher SPI rates than this. I have not + experimented a lot, but at 20MHz, the behavior is not the same with + all CM modules. This lower rate gives more predictable performance. Application Configuration -> NSH Library CONFIG_NSH_ARCHINIT=y : NSH board-initialization @@ -1490,7 +1494,11 @@ Configurations CONFIG_MTD=y : Enable MTD support CONFIG_MTD_AT25=y : Enable the AT25 driver CONFIG_AT25_SPIMODE=0 : Use SPI mode 0 - CONFIG_AT25_SPIFREQUENCY=20000000 : Use SPI frequency 20MHz + CONFIG_AT25_SPIFREQUENCY=10000000 : Use SPI frequency 10MHz + + The AT25 is capable of higher SPI rates than this. I have not + experimented a lot, but at 20MHz, the behavior is not the same with + all CM modules. This lower rate gives more predictable performance. Application Configuration -> NSH Library CONFIG_NSH_ARCHINIT=y : NSH board-initialization diff --git a/nuttx/configs/sama5d3x-ek/demo/defconfig b/nuttx/configs/sama5d3x-ek/demo/defconfig index bc6618345..90cc043de 100644 --- a/nuttx/configs/sama5d3x-ek/demo/defconfig +++ b/nuttx/configs/sama5d3x-ek/demo/defconfig @@ -421,7 +421,7 @@ CONFIG_MTD=y # CONFIG_MTD_AT24XX is not set CONFIG_MTD_AT25=y CONFIG_AT25_SPIMODE=0 -CONFIG_AT25_SPIFREQUENCY=20000000 +CONFIG_AT25_SPIFREQUENCY=10000000 # CONFIG_MTD_AT45DB is not set # CONFIG_MTD_M25P is not set # CONFIG_MTD_SMART is not set diff --git a/nuttx/drivers/usbdev/Kconfig b/nuttx/drivers/usbdev/Kconfig index 3151d04bd..53fc10a49 100644 --- a/nuttx/drivers/usbdev/Kconfig +++ b/nuttx/drivers/usbdev/Kconfig @@ -131,7 +131,7 @@ config COMPOSITE_VENDORID config COMPOSITE_VENDORSTR string "Composite vendor ID" - default "Nuttx" + default "NuttX" ---help--- The vendor ID code/string @@ -153,7 +153,7 @@ config COMPOSITE_SERIALSTR config COMPOSITE_CONFIGSTR string "Configuration string" - default "Nuttx COMPOSITE config" + default "NuttX COMPOSITE config" ---help--- Configuration string @@ -532,7 +532,7 @@ config USBMSC_VENDORID config USBMSC_VENDORSTR string "Mass storage vendor string" - default "Nuttx" + default "NuttX" ---help--- The vendor ID code/string |