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Mirtoo README.txt and SST25 comments update 

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4874 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo 2012-06-27 00:03:05 +00:00
parent 9be225d32d
commit 1a1acf6b7c
2 changed files with 23 additions and 11 deletions
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28
nuttx/configs/mirtoo/README.txt
View File

@ -821,13 +821,14 @@ Where <subdir> is one of the following:
nxffs:
This is a configuration very similar to the nsh configuration. This
configure also provides the NuttShell (NSH). This configuration use
configure also provides the NuttShell (NSH). And this configuration use
UART1 which is available on FUNC 4 and 5 on connector X3 (as described
for the nsh configuration). This configuration differs in the fillowing
ways:
for the nsh configuration). This configuration differs from the nsh
configuration in the following ways:
1) SPI2 is enabled and support is included for the NXFFS file system
on the 32Mbi SST25 device on the Mirtoo board.
on the 32Mbit SST25 device on the Mirtoo board. NXFFS is the NuttX
wear-leveling file system.
CONFIG_PIC32MX_SPI2=y
CONFIG_MTD_SST25=y
@ -866,12 +867,15 @@ Where <subdir> is one of the following:
CONFIG_NSH_DISABLE_TEST=y
CONFIG_NSH_DISABLE_WGET=y
When the system boots, you should have the NXFFS file system mounted
at /mnt/sst25.
NOTES: (1) It takes many seconds to boot the sytem using the NXFFS
file system because the entire FLASH must be verified on power up
(a probably several minutes the first time that NXFFS comes up and
had to format the file system). (2) FAT does not have these delays
and this configuration can be modified to use the (larger) FAT file
system as described below:
(and many *minutes* the first time that NXFFS comes up and has to
format the file system). (2) FAT does not have these delays and this
configuration can be modified to use the (larger) FAT file system as
described below:
fat:
There is no FAT configuration, but the nxffx configuration can be used
@ -881,3 +885,11 @@ Where <subdir> is one of the following:
CONFIG_FS_NXFFS=n
CONFIG_FS_FAT=y
CONFIG_NSH_DISABLE_MKFATFS=n
In this configuration, the FAT file system will not be automatically
monounted. When NuttX boots to the NSH prompt, you will find the
SST5 block driver at /dev/mtdblock0. This can be formatted with a
FAT file system and mounted with these commands:
nsh> mkfatfs /dev/mtdblock0
nsh> mount -t vfat /dev/mtdblock0 /mnt/sst25

6
nuttx/drivers/mtd/sst25.c
View File

@ -60,9 +60,9 @@
* Pre-processor Definitions
************************************************************************************/
/* Configuration ********************************************************************/
/* Per the data sheet, the SST25 parts can be driven with either SPI mode 0 (CPOL=0 and
* CPHA=0) or mode 3 (CPOL=1 and CPHA=1). But I have heard that other devices can
* operated in mode 0 or 1. So you may need to specify CONFIG_SST25_SPIMODE to
/* Per the data sheet, the SST25 parts can be driven with either SPI mode 0 (CPOL=0
* and CPHA=0) or mode 3 (CPOL=1 and CPHA=1). But I have heard that other devices
* can operate in mode 0 or 1. So you may need to specify CONFIG_SST25_SPIMODE to
* select the best mode for your device. If CONFIG_SST25_SPIMODE is not defined,
* mode 0 will be used.
*/