JS gesture sensor driver

Feb 5, 2015Download as pptx, pdf1 like765 views

A walkthrough of how to write a driver for a gesture sensor integrated circuit in JavaScript running on Tessel. Full driver is here: https://github.com/jiahuang/apds-gesture

JS Gesture Sensor Driver
@jia | Jia Huang | co-founder & developer Technical Machine

Tessel is a WiFi-enabled microcontroller
that runs JavaScript.

Hardware communication busses
I2C SPI UAR
T

I2C
I2C{SC
L
SDA
Clock
Data
binary 0 1 0 0 0 0 0 1 0

I2C
I2C{SC
L
SDA
Clock
Data
binary 0 1 0 0 0 0 0 1 0
= 0x42

I2C
I2C{SC
L
SDA
Clock
Data
binary 0 1 0 0 0 0 0 1 0
= 0x42WRONG

The devices support
the 7-bit I2C-bus
addressing protocol.
(datasheet pg 8 … out of 38)
RTFM

I2C
I2C{SC
L
SDA
Clock
Data
binary 0 1 0 0 0 0 0 1 0
MS
B
0 = write
1 = read
ACK

I2CI2C on Tessel
var i2c = new tessel.port[‘A’].I2C ( address )

I2CI2C on Tessel
i2c.send ( txBuffer, callback )
var i2c = new tessel.port[‘A’].I2C ( address )

I2CI2C on Tessel
i2c.send ( txBuffer, callback )
i2c.receive ( rxLength, callback )
var i2c = new tessel.port[‘A’].I2C ( address )

I2CI2C on Tessel
i2c.send ( txBuffer, callback )
i2c.receive ( rxLength, callback )
i2c.transfer ( txBuffer, rxLength, callback )
var i2c = new tessel.port[‘A’].I2C ( address )

RTFM
Start 0x39 write
ACK
Register to write Data to write
ACK ACK

Read these
Values
from
sensor
“host begins to read
0xFC and reads until
the FIFO is empty
(pg 33 of datasheet)

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
var tessel = require('tessel');
// 0x39 is device address
var i2c = tessel.port['A’].I2C(0x39);
i2c.transfer(new Buffer([0x92]), 1, function(err, data){
console.log('data', data);
if (data[0] == 0xAB) {
console.log('found a gesture sensor!');
}
});
1
2
3
4
5
6
7
8
9

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
Get gesture
direction
● Enable Register (0x80)
● Gesture Proximity Enter Threshold Register (0xA0)
● Gesture Exit Threshold Register (0xA1)
● Gesture Pulse Count and Length Register (0xA6)
● Gesture Control Enable (0xAB)

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
Get gesture
direction
Gesture Status Register (0xAF)
bit # 0 1 2 3 4 5 6 7

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
Gesture Status Register (0xAF)
bit # 0 1 2 3 4 5 6 7
GVALID
(1 = valid data)

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
Gesture Status Register (0xAF)
bit # 0 1 2 3 4 5 6 7
GVALID
(1 = valid data)
GFOV
1 = FIFO overflow

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
Gesture Status Register (0xAF)
bit # 0 1 2 3 4 5 6 7
Reserved
GVALID
(1 = valid data)
GFOV
1 = FIFO overflow

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
1. Get gesture data size
2. Read 4x amount of gesture data

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
1. Get gesture data size
2. Read 4x amount of gesture data
Gesture FIFO Level Register (0xAE)
Start reading from 0xFC (up dir)

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
threshold

Sensor present?
Enable sensor
Valid gesture?
Read gesture
registers
Math
threshold
start time end time
up_down = (data[up][start_time] - data[down][start_time]) -
(data[up][end_time] - data[down][end_time])
left_right = (data[left][start_time] - data[right][start_time]) -
(data[left][end_time] - data[right][end_time])

I2C
Questions?
github.com/jiahuang/apds-gesture
@jia | jia@technical.io

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