[pwm] Correction to heartbeat mode #25717
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rswarbrick
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Dec 20, 2024
Heartbeat direction reversal was premature in the event of passing the target duty cycle (non-wrapping case). The heartbeat direction shall only be changed at the end of the 'X'+1 pulse cycles for the current duty cycle. Signed-off-by: Adrian Lees <a.lees@lowrisc.org>
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rswarbrick
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Dec 20, 2024
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CHANGE AUTHORIZED: hw/ip/pwm/rtl/pwm_chan.sv This causes a behaviour change, but only by fixing a bug! Looks like the right thing to me. |
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Heartbeat direction reversal was premature in the event of passing the target duty cycle (non-wrapping case). The heartbeat direction shall only be changed at the end of the 'X'+1 pulse cycles for the current duty cycle.
This was found using the improved DV which is ongoing; the current DV environment overlooked this deviation from the specification.