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machine/hifive1: add GPIO Get() implementation and update other implementation to match latest SVD wrappers

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-10-08 20:22:53 +02:00
committed by Ayke
parent 92e07ec8af
commit 2168b1b516
3 changed files with 38 additions and 8 deletions
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src/runtime/runtime_fe310.go
+8 -8
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@@ -47,17 +47,17 @@ func init() {
func pric_init() {
// Make sure the HFROSC is on
sifive.PRIC.HFROSCCFG.SetBits(sifive.PRIC_HFROSCCFG_ENABLE)
sifive.PRCI.HFROSCCFG.SetBits(sifive.PRCI_HFROSCCFG_ENABLE)
// Run off 16 MHz Crystal for accuracy.
sifive.PRIC.PLLCFG.SetBits(sifive.PRIC_PLLCFG_REFSEL | sifive.PRIC_PLLCFG_BYPASS)
sifive.PRIC.PLLCFG.SetBits(sifive.PRIC_PLLCFG_SEL)
sifive.PRCI.PLLCFG.SetBits(sifive.PRCI_PLLCFG_REFSEL | sifive.PRCI_PLLCFG_BYPASS)
sifive.PRCI.PLLCFG.SetBits(sifive.PRCI_PLLCFG_SEL)
// Turn off HFROSC to save power
sifive.PRIC.HFROSCCFG.ClearBits(sifive.PRIC_HFROSCCFG_ENABLE)
sifive.PRCI.HFROSCCFG.ClearBits(sifive.PRCI_HFROSCCFG_ENABLE)
// Enable the RTC.
sifive.RTC.CONFIG.Set(sifive.RTC_CONFIG_ENALWAYS)
sifive.RTC.RTCCFG.Set(sifive.RTC_RTCCFG_ENALWAYS)
}
func preinit() {
@@ -85,10 +85,10 @@ func putchar(c byte) {
func ticks() timeUnit {
// Combining the low bits and the high bits yields a time span of over 270
// years without counter rollover.
highBits := sifive.RTC.HI.Get()
highBits := sifive.RTC.RTCHI.Get()
for {
lowBits := sifive.RTC.LO.Get()
newHighBits := sifive.RTC.HI.Get()
lowBits := sifive.RTC.RTCLO.Get()
newHighBits := sifive.RTC.RTCHI.Get()
if newHighBits == highBits {
// High bits stayed the same.
return timeUnit(lowBits) | (timeUnit(highBits) << 32)