Commit 014d8414 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
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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: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6dfb66d8

drivers/staging/comedi/drivers/multiq3.c

+10 −10
Original line number Diff line number Diff line
@@ -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