RSSI scaling pwm channel

ArduCopter Copter 3.6
1

I have configured rssi on channel 14.
mpconfig

I’ve got the following values on my transmitter and in mission planner
(normal and range test):

Transmitter MP pwm rxrssi
88 1928 92
50 1753 72

Transmitter shows 88, ch14 is 1928us, MP shows 92.
Transmitter shows 50, ch14 is 1753us, MP shows 72.

How is the rssi input channel scaled ?
If 1000us = 0% and 2000us = 100%,
1753us would be 87% (1753/2000).

Copter 3.6.7

2

your forgetting the 1000 offset

(1753 - 1000) / (2000 - 1000) = 753 / 1000 = 75.3%

3

you are right, my fault!
thanks