pmw3901.h File Reference

PixArt PMW3901MB optical flow sensor over SPI (mode 3, <= 2 MHz). More...

#include <stdint.h>

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Data Structures
struct	pmw_bus_t
struct	pmw_burst_t

Functions
int	pmw_init (const pmw_bus_t *bus)
	0 = product id ok, configured
void	pmw_burst (pmw_burst_t *b)
	motion burst (register 0x16)
uint8_t	pmw_valid (const pmw_burst_t *b)
	PixArt rule: SQUAL < 0x19 with the shutter at its maximum = no usable features.

Detailed Description

PixArt PMW3901MB optical flow sensor over SPI (mode 3, <= 2 MHz).

Register sequences from the Bitcraze PMW3901 driver (MIT licence, see pmw3901.c). The bus is given as callbacks: no registers here, host-testable.

Definition in file pmw3901.h.

Function Documentation

pmw_init()

int pmw_init

(

const pmw_bus_t *

bus

)

0 = product id ok, configured

Definition at line 59 of file pmw3901.c.

References pmw_bus_t::cs, pmw_bus_t::delay_us, k_init1, k_init2, PMW_INV_PRODUCT_ID, PMW_PRODUCT_ID, rd(), pmw_bus_t::reset, s_b, and wr().

Referenced by main().

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pmw_burst()

void pmw_burst

(

pmw_burst_t *

b

)

motion burst (register 0x16)

Definition at line 85 of file pmw3901.c.

References pmw_bus_t::cs, pmw_bus_t::delay_us, pmw_burst_t::dx, pmw_burst_t::dy, pmw_burst_t::motion, pmw_burst_t::observation, PMW_REG_MOTION_BURST, pmw_burst_t::raw_max, pmw_burst_t::raw_min, pmw_burst_t::raw_sum, s_b, pmw_burst_t::shutter, pmw_burst_t::squal, and pmw_bus_t::xfer.

Referenced by main().

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pmw_valid()

uint8_t pmw_valid

(

const pmw_burst_t *

b

)

PixArt rule: SQUAL < 0x19 with the shutter at its maximum = no usable features.

Definition at line 106 of file pmw3901.c.

References pmw_burst_t::shutter, and pmw_burst_t::squal.

Referenced by main().

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