diff options
Diffstat (limited to 'src/runtime/runtime_fe310_baremetal.go')
| -rw-r--r-- | src/runtime/runtime_fe310_baremetal.go | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/runtime/runtime_fe310_baremetal.go b/src/runtime/runtime_fe310_baremetal.go index e04560c4a..4fa62e69a 100644 --- a/src/runtime/runtime_fe310_baremetal.go +++ b/src/runtime/runtime_fe310_baremetal.go @@ -6,7 +6,21 @@ import ( "device/riscv" ) -const tickMicros = 32768 // RTC clock runs at 32.768kHz +// ticksToNanoseconds converts RTC ticks (at 32768Hz) to nanoseconds. +func ticksToNanoseconds(ticks timeUnit) int64 { + // The following calculation is actually the following, but with both sides + // reduced to reduce the risk of overflow: + // ticks * 1e9 / 32768 + return int64(ticks) * 1953125 / 64 +} + +// nanosecondsToTicks converts nanoseconds to RTC ticks (running at 32768Hz). +func nanosecondsToTicks(ns int64) timeUnit { + // The following calculation is actually the following, but with both sides + // reduced to reduce the risk of overflow: + // ns * 32768 / 1e9 + return timeUnit(ns * 64 / 1953125) +} func abort() { // lock up forever |