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staging: comedi: multiq3: document the encoder chip commands 

Add some comments to document the commands that are sent to the
encoder chips.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2015-10-05 15:33:14 -07:00 committed by Greg Kroah-Hartman
parent 6dfb66d899
commit 014d8414ce
1 changed files with 10 additions and 10 deletions
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20
drivers/staging/comedi/drivers/multiq3.c
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@ -65,17 +65,17 @@
#define MULTIQ3_ENC_CTRL_REG 0x0e
/*
* flags for encoder control
* Encoder chip commands (from the programming manual)
*/
#define MULTIQ3_CLOCK_DATA 0x00
#define MULTIQ3_CLOCK_SETUP 0x18
#define MULTIQ3_INPUT_SETUP 0x41
#define MULTIQ3_QUAD_X4 0x38
#define MULTIQ3_BP_RESET 0x01
#define MULTIQ3_CNTR_RESET 0x02
#define MULTIQ3_TRSFRPR_CTR 0x08
#define MULTIQ3_TRSFRCNTR_OL 0x10
#define MULTIQ3_EFLAG_RESET 0x06
#define MULTIQ3_CLOCK_DATA 0x00 /* FCK frequency divider */
#define MULTIQ3_CLOCK_SETUP 0x18 /* xfer PR0 to PSC */
#define MULTIQ3_INPUT_SETUP 0x41 /* enable inputs A and B */
#define MULTIQ3_QUAD_X4 0x38 /* quadrature */
#define MULTIQ3_BP_RESET 0x01 /* reset byte pointer */
#define MULTIQ3_CNTR_RESET 0x02 /* reset counter */
#define MULTIQ3_TRSFRPR_CTR 0x08 /* xfre preset reg to counter */
#define MULTIQ3_TRSFRCNTR_OL 0x10 /* xfer CNTR to OL (x and y) */
#define MULTIQ3_EFLAG_RESET 0x06 /* reset E bit of flag reg */
#define MULTIQ3_TIMEOUT 30