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| 型號： | 101-1226 |
| 廠商： | Rabbit Semiconductor |
| 文件頁數(shù)： | 104/168頁 |
| 文件大?。?/td> | 0K |
| 描述： | RCM3900 DEV KIT UNIVERSAL |
| 標準包裝： | 1 |
| 系列： | RabbitCore 3900 |
| 類型： | MPU 模塊 |
| 適用于相關(guān)產(chǎn)品： | RCM3900 |
| 所含物品： | RabbitCore 模塊、開發(fā)板、交流適配器、纜線和 Dynamic C? 光盤 |
| 其它名稱： | 316-1137 |
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RabbitCore RCM3900 User’s Manual
40
It is possible to hot-swap microSD Cards without removing power from the RCM3900
modules. The file system partition must be unmounted before the cards can be safely hot-
swapped. The chip selects associated with the card must be set to their inactive state, and
read/write operations addressed to the microSD Card port cannot be allowed to occur.
These operations can be initiated in software by sensing an external switch actuated by the
user, and the card can then be removed and replaced with a different one. Once the appli-
cation program detects a new card, the file system partition can be remounted. These steps
allow the microSD Card to be installed or removed without affecting either the pro-
gram, which continues to run on the RCM3900 module, or the data stored on the card. The
Dynamic C FAT file system will handle this overhead automatically by unmounting the
microSD Card.
NOTE: When using the optional Dynamic C FAT file system module, do not remove or
insert the microSD Card while the
microSD Card is mounted.
You may add an LED to your design or use the BSY LED at DS4 to indicate when the
microSD Card is mounted. The LED can be set to turn off when the microSD Card is
unmounted, indicating that it is safe to remove it. The BSY LED at DS4 is controlled by
PD0; your own LED would use an available parallel port I/O pin. The following macros in
the Dynamic C LIB\Rabbit3000\SDflash\SDFLASH.LIB library will have to be
modified to identify the parallel port pin and to specify the on/off conditions for the LED.
#define SD_LED_PORT_DR
PxDR
// where x is the Parallel Port (A–E)
// 0 for no indicator LED
#define SD_LED_PORT_DRSHADOW
PxDRShadow
// where x is the Parallel Port
// NULL for no indicator LED
#define SD_LED_PORT_FR
PxDFR // where x is the Parallel Port (A–E)
// 0 for no indicator LED
#define SD_LED_PORT_FRSHADOW
PxFRShadow
// where x is the Parallel Port
// NULL for no indicator LED
#define SD_LED_PORT_DDR
PxDDR // where x is the Parallel Port (A–E)
// 0 for no indicator LED
#define SD_LED_PORT_DDRSHADOW PxDDRShadow
// where x is the Parallel Port
// NULL for no indicator LED
#define SD_LED_PORT_DCR
PxCR
// where x is the Parallel Port (A–E)
// 0 for no indicator LED
#define SD_LED_PORT_DCRSHADOW PxCRShadow
// where x is the Parallel Port
// NULL for no indicator LED
#define SD_LED_PIN
n
// Identify pin on parallel port (0–7)
// Use 0 for no indicator LED
#define SD_LED_PORT_OD
0
// LED is driven by transistor
// 1 to drive LED directly by open-drain output
#define SD_LED_PORT_ON
1
// 0 for no indicator LED or to drive LED
// directly by open-drain output, otherwise 1
Standard Windows SD Card readers may be used to read the microSD Card formatted
by the Dynamic C FAT file system with the RCM3900 as long as it has not been parti-
tioned. An SD Card adapter is included with the microSD Card in the in the RCM3900
Development Kit. The SD Card adapter has a sliding switch along the left side that may be
moved down to write-protect the microSD Card while it is being used with an SD Card
reader.
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