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Update README with info about the timer API

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Signed-off-by: Joachim Strömbergson <joachim@assured.se>
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Joachim Strömbergson 2023-05-08 11:02:05 +02:00 • committed by dehanj
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hw/application_fpga/core/timer/README.md
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@ -7,8 +7,29 @@ allows measurement of time durations rather than cycles. If for
example setting the prescaler to the clock frequency in Hertz, the example setting the prescaler to the clock frequency in Hertz, the
timer will count seconds. timer will count seconds.
## API
The following addresses define the API for the timer:
```
ADDR_CTRL: 0x08
CTRL_START_BIT: 0
CTRL_STOP_BIT: 1
ADDR_STATUS: 0x09
STATUS_RUNNING_BIT: 0
ADDR_PRESCALER: 0x0a
ADDR_TIMER: 0x0b
```
## Details ## Details
The core consists of the timer_core module (in timer_core.v) and a top
level wrapper, timer (in timer.v). The top level wrapper implements
the API, while the timer_core implements the actual timer
functionality.
The timer counter and the prescaler counter are both 32 bits. The timer counter and the prescaler counter are both 32 bits.
When enabled the counter counts down one integer value per cycle. When enabled the counter counts down one integer value per cycle.