TS-7180 Quadrature
From embeddedTS Manuals
The TS-7180 provides three independent quadrature counters. The associated inputs are shown in the table below.
| ||||||||
Each of the quadrature counters (which are in the FPGA) is 16-bits wide, and are accessed via i2c. The addresses are shown below.
| Quad # | MSB | LSB | MSB Alias |
|---|---|---|---|
| Quad0 | 96 | 97 | 98 |
| Quad1 | 99 | 100 | 101 |
| Quad2 | 102 | 103 | 104 |
For example, to read the MSB for Quad1:
tshwctl -r -a 99
The MSB aliases are used to detect 16-bit rollover. If the first reading of the MSB is not equal to the second, overflow/underflow was detected during the read.