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Use calculations on constants to (slightly) reduce code size

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4077 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2011-11-01 16:48:21 +00:00
parent 2cb6ea3f2f
commit 7c1d6619fa
2 changed files with 11 additions and 10 deletions
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4
ChangeLog
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@ -2190,5 +2190,5 @@
has no value inodes on it.
* drivers/mtd/at24xx.c: Now supports a configurable block size that
supports using "clusters" of AT24 pages as blocks. This allows bigger
block sizes and more efficient use of FLASH when the AT24 is used to
support a file system (such as NXFFS).
block sizes and more efficient use of EEPROM when the AT24 is used to
support a file system (such as NXFFS). (Contributed by Hal Glenn).

17
drivers/mtd/at24xx.c
View File

@ -204,8 +204,8 @@ static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock,
size_t blocksleft;
#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
startblock *= CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE;
nblocks *= CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE;
startblock *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
nblocks *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
#endif
blocksleft = nblocks;
@ -264,8 +264,8 @@ static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t
uint8_t buf[AT24XX_PAGESIZE+2];
#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
startblock *= CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE;
nblocks *= CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE;
startblock *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
nblocks *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
#endif
blocksleft = nblocks;
@ -302,7 +302,7 @@ static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t
}
#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
return nblocks /(CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
return nblocks / (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
#else
return nblocks;
#endif
@ -343,13 +343,14 @@ static int at24c_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
* It has to be at least as big as the blocksize, bigger serves no
* purpose.
* neraseblocks
* Note that the device size is in kb, so * 1024 / 8 for bytes
* Note that the device size is in kilobits and must be scaled by
* 1024 / 8
*/
#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
geo->blocksize = CONFIG_AT24XX_MTD_BLOCKSIZE;
geo->erasesize = geo->blocksize;
geo->neraseblocks = CONFIG_AT24XX_SIZE * (1024/8) / geo->erasesize;
geo->erasesize = CONFIG_AT24XX_MTD_BLOCKSIZE;
geo->neraseblocks = (CONFIG_AT24XX_SIZE * 1024 / 8) / CONFIG_AT24XX_MTD_BLOCKSIZE;
#else
geo->blocksize = priv->pagesize;
geo->erasesize = priv->pagesize;