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| author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-04-07 03:00:34 +0000 |
|---|---|---|
| committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-04-07 03:00:34 +0000 |
| commit | dbcd8d0405401b1d295a515cc165dacaeaf88f30 (patch) | |
| tree | 27f45d162fcb904397206a8f4e14b65e859b200d /nuttx/configs/sam3u-ek/include | |
| parent | e48b94c16b0771e91cdb16d2da6c89c3f768bbbb (diff) | |
| download | px4-nuttx-dbcd8d0405401b1d295a515cc165dacaeaf88f30.tar.gz px4-nuttx-dbcd8d0405401b1d295a515cc165dacaeaf88f30.tar.bz2 px4-nuttx-dbcd8d0405401b1d295a515cc165dacaeaf88f30.zip | |
Update clock logic
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2576 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/configs/sam3u-ek/include')
| -rwxr-xr-x | nuttx/configs/sam3u-ek/include/board.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/nuttx/configs/sam3u-ek/include/board.h b/nuttx/configs/sam3u-ek/include/board.h index 5a07e9d3d..45335e6b0 100755 --- a/nuttx/configs/sam3u-ek/include/board.h +++ b/nuttx/configs/sam3u-ek/include/board.h @@ -87,6 +87,28 @@ #define SAM3U_PLLA_FREQUENCY (96000000) #define SAM3U_CPU_FREQUENCY (48000000) +/* HSMCI clocking + * + * Multimedia Card Interface clock (MCCK or MCI_CK) is Master Clock (MCK) + * divided by (2*(CLKDIV+1)). + * + * MCI_SPEED = MCK / (2*(CLKDIV+1)) + * CLKDIV = MCI / MCI_SPEED / 2 - 1 + */ + +/* MCK = 48MHz, CLKDIV = 59, MCI_SPEED = 48MHz / 2 * (59+1) = 400 KHz */ + +#define HSMCI_INIT_CLKDIV (59 << HSMCI_MR_CLKDIV_SHIFT) + +/* MCK = 48MHz, CLKDIV = 1, MCI_SPEED = 48MHz / 2 * (1+1) = 12 MHz */ + +#define HSMCI_MMCXFR_CLKDIV (3 << HSMCI_MR_CLKDIV_SHIFT) + +/* MCK = 48MHz, CLKDIV = 0, MCI_SPEED = 48MHz / 2 * (0+1) = 24 MHz */ + +#define HSMCI_SDXFR_CLKDIV (0 << HSMCI_MR_CLKDIV_SHIFT) +#define HSMCI_SDWIDEXFR_CLKDIV HSMCI_SDXFR_CLKDIV + /* LED definitions ******************************************************************/ #define LED_STARTED 0 /* LED0=OFF LED1=OFF LED2=OFF */ |