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Diffstat (limited to 'nuttx/configs/sam4e-ek/README.txt')
| -rw-r--r-- | nuttx/configs/sam4e-ek/README.txt | 99 |
1 files changed, 95 insertions, 4 deletions
diff --git a/nuttx/configs/sam4e-ek/README.txt b/nuttx/configs/sam4e-ek/README.txt index d8e7669fa..d1b8af274 100644 --- a/nuttx/configs/sam4e-ek/README.txt +++ b/nuttx/configs/sam4e-ek/README.txt @@ -20,6 +20,7 @@ Contents - LEDs - Serial Console - Networking Support + - AT25 Serial FLASH - SAM4E-EK-specific Configuration Options - Configurations @@ -343,8 +344,8 @@ Serial Console By default serial console is configured for 115000, 8-bit, 1 stop bit, and no parity. -Networking -========== +Networking Support +================== Networking support via the can be added to NSH by selecting the following configuration options. @@ -502,6 +503,89 @@ Networking a network because additional time will be required to fail with timeout errors. +AT25 Serial FLASH +================= + + Connections + ----------- + + Both the SAM4E-EK include an Atmel AT25DF321A, 32-megabit, 2.7-volt + SPI serial flash. The SPI + connection is as follows: + + ------ ------- --------------- + SAM4E AT25 SAM4E + GPIO PIN FUNCTION + ------ ------- --------------- + PA13 SI MOSI + PA12 SO MIS0 + PA14 SCK SPCK + PA5 /CS NPCS3 (pulled high externally) + ------ ------- --------------- + + Configuration + ------------- + + Support for the serial FLASH can be enabled in these configurations. These + are the relevant configuration settings. These settings (1) Enable SPI0, + (2) Enable DMAC0 to support DMA transfers on SPI for best performance, + (3) Enable the AT25 Serial FLASH, and (3) Set up NuttX to configure the + file system on the AT25 FLASH: + + System Type -> ATSAM3/4 Peripheral Support + CONFIG_SAM34_SPI0=y : Enable SPI0 + CONFIG_SAM34_DMAC0=y : Enable DMA controller 0 + + System Type -> SPI device driver options + CONFIG_SAM34_SPI_DMA=y : Use DMA for SPI transfers + CONFIG_SAM34_SPI_DMATHRESHOLD=4 : Don't DMA for small transfers + + Device Drivers -> SPI Driver Support + CONFIG_SPI=y : Enable SPI support + CONFIG_SPI_EXCHANGE=y : Support the exchange method + + Device Drivers -> Memory Technology Device (MTD) Support + 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 12MHz + + The AT25 is capable of operation at 20MHz. However, if you experience + any issues with the AT25, then lower this frequency may give more + predictable performance. + + File Systems -> FAT + CONFIG_FS_FAT=y : Enable and configure FAT + CONFIG_FAT_LCNAMES=y : Upper/lower case names + CONFIG_FAT_LFN=y : Long file name support (See NOTE) + CONFIG_FAT_MAXFNAME=32 : Limit filename sizes to 32 bytes + + NOTE: Use care if you plan to use FAT long file name feature in a product; + There are issues with certain Microsoft patents on the long file name + technology. + + Application Configuration -> NSH Library + CONFIG_NSH_ARCHINIT=y : NSH board-initialization + + Board Selection + CONFIG_SAM4EEK_AT25_AUTOMOUNT=y : Mounts AT25 for NSH + CONFIG_SAM4EEK_AT25_FTL=y : Create block driver for FAT + + You can then format the AT25 FLASH for a FAT file system and mount the + file system at /mnt/at25 using these NSH commands: + + nsh> mkfatfs /dev/mtdblock0 + nsh> mount -t vfat /dev/mtdblock0 /mnt/at25 + + Then you an use the FLASH as a normal FAT file system: + + nsh> echo "This is a test" >/mnt/at25/atest.txt + nsh> ls -l /mnt/at25 + /mnt/at25: + -rw-rw-rw- 16 atest.txt + nsh> cat /mnt/at25/atest.txt + This is a test + SAM4E-EK-specific Configuration Options ======================================= @@ -793,7 +877,12 @@ Configurations CONFIG_NSH_DHCPC=y : Tells NSH to use DHCPC, not : the fixed addresses - 4. This configuration has been used for verifying the touchscreen on + 4. This configuration has the DMA-based SPI0 and AT25 Serial FLASH + support enabled by default. This can be easily disabled or + reconfigured (See see the configuration settings and usage notes + above in the section entitled "AT25 Serial FLASH"). + + 5. This configuration has been used for verifying the touchscreen on on the SAM4E-EK LCD. With these modifications, you can include the touchscreen test program at apps/examples/touchscreen as an NSH built-in application. You can enable the touchscreen and test by modifying the @@ -837,7 +926,7 @@ Configurations CONFIG_DEBUG_VERBOSE=y : Enable verbose debug output CONFIG_DEBUG_INPUT=y : Enable debug output from input devices - 4. Enabling HSMCI support. The SAM3U-KE provides a an SD memory card + 6. Enabling HSMCI support. The SAM3U-KE provides a an SD memory card slot. Support for the SD slot can be enabled with the following settings: @@ -868,3 +957,5 @@ Configurations has been verified. HSMCI and touchscreen have not been tested (the above notes came from the SAM3U-EK and have not been yet been tested on the SAM4E-EK). + 2014-3-14: The DMA-based SPI appears to be functional and can be used + to support a FAT file system on the AT25 Serial FLASH. |