pmw3901.c File Reference

PMW3901MB driver (see pmw3901.h). More...

#include "pmw3901.h"

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Macros
#define	PMW_PRODUCT_ID   0x49u
#define	PMW_INV_PRODUCT_ID   0xB6u
#define	PMW_REG_MOTION_BURST   0x16u

Functions
static void	wr (uint8_t reg, uint8_t v)
static uint8_t	rd (uint8_t reg)
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.

Variables
static const pmw_bus_t *	s_b
static const uint8_t	k_init1 [][2]
static const uint8_t	k_init2 [][2]

Detailed Description

PMW3901MB driver (see pmw3901.h).

The power-up check and the "performance optimisation" register sequence are taken from the Bitcraze PMW3901 Arduino driver: Copyright (c) 2017 Bitcraze AB. MIT License: permission is hereby granted, free of charge, to deal in the Software without restriction, subject to including the copyright notice and this permission notice. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.

Definition in file pmw3901.c.

Macro Definition Documentation

PMW_PRODUCT_ID

#define PMW_PRODUCT_ID   0x49u

Definition at line 14 of file pmw3901.c.

PMW_INV_PRODUCT_ID

#define PMW_INV_PRODUCT_ID   0xB6u

Definition at line 15 of file pmw3901.c.

PMW_REG_MOTION_BURST

#define PMW_REG_MOTION_BURST   0x16u

Definition at line 16 of file pmw3901.c.

Function Documentation

wr()

static void wr ( uint8_t  reg, uint8_t  v  )

static

Definition at line 20 of file pmw3901.c.

References pmw_bus_t::cs, pmw_bus_t::delay_us, s_b, and pmw_bus_t::xfer.

Referenced by pmw_init().

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rd()

static uint8_t rd ( uint8_t  reg )

static

Definition at line 31 of file pmw3901.c.

References pmw_bus_t::cs, pmw_bus_t::delay_us, s_b, and pmw_bus_t::xfer.

Referenced by pmw_init().

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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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Variable Documentation

s_b

const pmw_bus_t* s_b

static

Definition at line 18 of file pmw3901.c.

Referenced by pmw_burst(), pmw_init(), rd(), and wr().

k_init1

const uint8_t k_init1[][2]

static

Initial value:

= {
    {0x7F,0x00},{0x61,0xAD},{0x7F,0x03},{0x40,0x00},{0x7F,0x05},{0x41,0xB3},{0x43,0xF1},{0x45,0x14},
    {0x5B,0x32},{0x5F,0x34},{0x7B,0x08},{0x7F,0x06},{0x44,0x1B},{0x40,0xBF},{0x4E,0x3F},{0x7F,0x08},
    {0x65,0x20},{0x6A,0x18},{0x7F,0x09},{0x4F,0xAF},{0x5F,0x40},{0x48,0x80},{0x49,0x80},{0x57,0x77},
    {0x60,0x78},{0x61,0x78},{0x62,0x08},{0x63,0x50},{0x7F,0x0A},{0x45,0x60},{0x7F,0x00},{0x4D,0x11},
    {0x55,0x80},{0x74,0x1F},{0x75,0x1F},{0x4A,0x78},{0x4B,0x78},{0x44,0x08},{0x45,0x50},{0x64,0xFF},
    {0x65,0x1F},{0x7F,0x14},{0x65,0x60},{0x66,0x08},{0x63,0x78},{0x7F,0x15},{0x48,0x58},{0x7F,0x07},
    {0x41,0x0D},{0x43,0x14},{0x4B,0x0E},{0x45,0x0F},{0x44,0x42},{0x4C,0x80},{0x7F,0x10},{0x5B,0x02},
    {0x7F,0x07},{0x40,0x41},{0x70,0x00}
}

Definition at line 44 of file pmw3901.c.

Referenced by pmw_init().

k_init2

const uint8_t k_init2[][2]

static

Initial value:

= {
    {0x32,0x44},{0x7F,0x07},{0x40,0x40},{0x7F,0x06},{0x62,0xF0},{0x63,0x00},{0x7F,0x0D},{0x48,0xC0},
    {0x6F,0xD5},{0x7F,0x00},{0x5B,0xA0},{0x4E,0xA8},{0x5A,0x50},{0x40,0x80}
}

Definition at line 54 of file pmw3901.c.

Referenced by pmw_init().