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samd51: improve TRNG

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This commit is contained in:
sago35
2022-07-21 16:41:00 +09:00
committed by Ron Evans
parent 13ed58950f
commit 3047d8f321
1 changed files with 3 additions and 5 deletions
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src/machine/machine_atsamd51.go
+3 -5
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@@ -2067,18 +2067,16 @@ func (dac DAC) syncDAC() {
} }
} }
var rngInitDone = false
// GetRNG returns 32 bits of cryptographically secure random data // GetRNG returns 32 bits of cryptographically secure random data
func GetRNG() (uint32, error) { func GetRNG() (uint32, error) {
if !rngInitDone { if !sam.MCLK.APBCMASK.HasBits(sam.MCLK_APBCMASK_TRNG_) {
// Turn on clock for TRNG // Turn on clock for TRNG
sam.MCLK.APBCMASK.SetBits(sam.MCLK_APBCMASK_TRNG_) sam.MCLK.APBCMASK.SetBits(sam.MCLK_APBCMASK_TRNG_)
// enable // enable
sam.TRNG.CTRLA.Set(sam.TRNG_CTRLA_ENABLE) sam.TRNG.CTRLA.Set(sam.TRNG_CTRLA_ENABLE)
}
rngInitDone = true for !sam.TRNG.INTFLAG.HasBits(sam.TRNG_INTFLAG_DATARDY) {
} }
ret := sam.TRNG.DATA.Get() ret := sam.TRNG.DATA.Get()
return ret, nil return ret, nil