These are implementation notes for hw40_D52A.c.

Hw40_D52A.c version 1.1 is derived from Hw40_D51.c and demonstrates sampling the accelerometer, returning the data within the ID field. It's the equivalent of the "Rohit accel in ID" application for the new hardware.

Hw40_D52A.c version 1.2 improved the range of version 1, upping the "cold start" range from 14.5 inches to 31 inches. It also fixes a race condition in the sensor sampling code that could sometimes cause the device to stop responding.

The plan is to merge this code into the Hw40_D51.c version 1.2 release, with its accel sampling functionality accessible via a #define. But if you need this functionality now and Hw40_D51.c version 1.2 isn't out yet, use this code instead.

Firmware status
Fw src
WISP hw
Readers
Functionality
RFID protocol
Modulation
Range (cold start)
comments
known issues
hw40_D52A.c - v. 1.2
4.0DL
Impinj 3.0.2
query-ack-accel sensor
gen2
Miller-4
31"
tested on #4; fix for range + accel sampling lockup bug

hw40_D52A.c - v. 1.1
4.0DL
Impinj 3.0.2
query-ack-accel sensor
gen2
Miller-4
14.5"
wisp #4 has broken X axis; tested on wisp #1 (has 3v sv)
poor range