PixArt / Mbed OS 3901_referenceFirmware

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Welcome to the code repository for PixArt's PMW3901MB sensor and evaluation board.

For general information about this product, please visit this product's components page here:
https://os.mbed.com/components/PMW3901MB-Far-Field-Optical-Motion-Track/

For guides and tips on how to setup and evaluate the PMW3901MB sensor with the Nordic nRF52-DK microcontroller using this reference code, please visit this guide:
https://os.mbed.com/teams/PixArt/code/3901_referenceFirmware/wiki/Guide-for-nRF52-DK-Platform

For guides and tips on how to setup and evaluate the PMW3901MB sensor with any microcontroller using this reference code, please visit this guide:
https://os.mbed.com/teams/PixArt/code/3901_referenceFirmware/wiki/Guide-for-Any-Platform

main.cpp@0:c00f2464eee3, 2018-03-14 (annotated)

Committer:
PixArtVY
Date:
Wed Mar 14 21:22:43 2018 +0000
Revision:
0:c00f2464eee3
Child:
1:10365086d44e
First release.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
PixArtVY 0:c00f2464eee3 1 // PMW3901MB: Optical Motion Tracking Chip reference code.
PixArtVY 0:c00f2464eee3 2 // Version: 1.0
PixArtVY 0:c00f2464eee3 3 // Latest Revision Date: 13 Mar. 2018
PixArtVY 0:c00f2464eee3 4 // By PixArt Imaging Inc.
PixArtVY 0:c00f2464eee3 5 // Primary Engineer: Vincent Yeh (PixArt USA)
PixArtVY 0:c00f2464eee3 6
PixArtVY 0:c00f2464eee3 7 /*
PixArtVY 0:c00f2464eee3 8 //=======================
PixArtVY 0:c00f2464eee3 9 //Revision History
PixArtVY 0:c00f2464eee3 10 //=======================
PixArtVY 0:c00f2464eee3 11 Version 1.0 -- 13 Mar. 2018
PixArtVY 0:c00f2464eee3 12 First release.
PixArtVY 0:c00f2464eee3 13 */
PixArtVY 0:c00f2464eee3 14
PixArtVY 0:c00f2464eee3 15 #include "mbed.h"
PixArtVY 0:c00f2464eee3 16 #include "SPIcommFunctions.h"
PixArtVY 0:c00f2464eee3 17
PixArtVY 0:c00f2464eee3 18 int main()
PixArtVY 0:c00f2464eee3 19 {
PixArtVY 0:c00f2464eee3 20 pc.baud(115200); // Set baud rate to 115200. Remember to sync serial terminal baud rate to the same value.
PixArtVY 0:c00f2464eee3 21
PixArtVY 0:c00f2464eee3 22 spi.format(8,3); // Set SPI to 8 bits with inverted polarity and phase-shifted to second edge.
PixArtVY 0:c00f2464eee3 23 spi.frequency(1000000); // Set frequency for SPI communication.
PixArtVY 0:c00f2464eee3 24 cs = 1; // Initialize chip select as inactive.
PixArtVY 0:c00f2464eee3 25
PixArtVY 0:c00f2464eee3 26 pc.printf("Program START\n\r");
PixArtVY 0:c00f2464eee3 27
PixArtVY 0:c00f2464eee3 28 pc.printf("ID Check: %2X\n\r", readRegister(0x00)); //Checks product ID to make sure communication protocol is working properly.
PixArtVY 0:c00f2464eee3 29 if(readRegister(0x00) != 0x49)
PixArtVY 0:c00f2464eee3 30 {
PixArtVY 0:c00f2464eee3 31 pc.printf("Communication protocol error! Terminating program.\n\r");
PixArtVY 0:c00f2464eee3 32 return 0;
PixArtVY 0:c00f2464eee3 33 }
PixArtVY 0:c00f2464eee3 34
PixArtVY 0:c00f2464eee3 35 initializeSensor();
PixArtVY 0:c00f2464eee3 36
PixArtVY 0:c00f2464eee3 37 while(1)
PixArtVY 0:c00f2464eee3 38 {
PixArtVY 0:c00f2464eee3 39 //pc.printf("MOTION bit: %2X\n\r", (readRegister(0x02) & 0x80) >> 7); //Prints motion bit for debugging. 1 = motion detected. 0 = no motion detected.
PixArtVY 0:c00f2464eee3 40
PixArtVY 0:c00f2464eee3 41 if(readRegister(0x02) & 0x80)
PixArtVY 0:c00f2464eee3 42 {
PixArtVY 0:c00f2464eee3 43 grabData();
PixArtVY 0:c00f2464eee3 44 printData();
PixArtVY 0:c00f2464eee3 45 }
PixArtVY 0:c00f2464eee3 46 }
PixArtVY 0:c00f2464eee3 47 }