TS-7180 Quadrature: Difference between revisions
From embeddedTS Manuals
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== Quadrature Counters == | |||
The TS-7180 provides three independent quadrature counters. The associated inputs are shown in the table below. | The TS-7180 provides three independent quadrature counters. The associated inputs are shown in the table below. | ||
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Each of the quadrature counters (which are in the FPGA) is 16-bits wide, and are accessed via i2c. The addresses are shown 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. | ||
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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. | 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. | ||
== Edge-Counters, Period-counters == | |||
For each input pin, there is an edge-counter, and a period-counter. The former counts the positive edges on an input pin, while the latter may be used to measure the elapsed time between N positive-edges. | |||
Revision as of 14:40, 6 June 2018
Quadrature Counters
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.
Edge-Counters, Period-counters
For each input pin, there is an edge-counter, and a period-counter. The former counts the positive edges on an input pin, while the latter may be used to measure the elapsed time between N positive-edges.