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| author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-02-15 17:51:30 +0000 |
|---|---|---|
| committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-02-15 17:51:30 +0000 |
| commit | 8b265a45d9b5d840b563321941c632bd3b2c3963 (patch) | |
| tree | 35172ca6e0c8bc762e6ee6588589e6ef2a5d350d /nuttx/drivers/sensors | |
| parent | 9f4ec53da93776bfcf221a699317c59a13782d7e (diff) | |
| download | px4-nuttx-8b265a45d9b5d840b563321941c632bd3b2c3963.tar.gz px4-nuttx-8b265a45d9b5d840b563321941c632bd3b2c3963.tar.bz2 px4-nuttx-8b265a45d9b5d840b563321941c632bd3b2c3963.zip | |
Add QE support to STM32F4Discovery; add a test of the quadrature encoder driver
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4395 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/drivers/sensors')
| -rw-r--r-- | nuttx/drivers/sensors/qencoder.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/nuttx/drivers/sensors/qencoder.c b/nuttx/drivers/sensors/qencoder.c index edbe8255c..84bc15813 100644 --- a/nuttx/drivers/sensors/qencoder.c +++ b/nuttx/drivers/sensors/qencoder.c @@ -365,7 +365,13 @@ static int qe_ioctl(FAR struct file *filep, int cmd, unsigned long arg) * lower - An instance of the lower half interface * * Returned Value: - * Zero (OK) on success; a negated errno value on failure. + * Zero (OK) on success; a negated errno value on failure. The following + * possible error values may be returned (most are returned by + * register_driver()): + * + * EINVAL - 'path' is invalid for this operation + * EEXIST - An inode already exists at 'path' + * ENOMEM - Failed to allocate in-memory resources for the operation * ****************************************************************************/ |