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machine/atsamd21: correct issue with invalid first reading coming from ADC

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-09-06 12:44:28 +02:00
committed by Ayke
parent a718b10502
commit 4ee26fd54b
1 changed files with 5 additions and 0 deletions
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src/machine/machine_atsamd21.go
+5
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@@ -192,6 +192,11 @@ func (a ADC) Get() uint16 {
sam.ADC.SWTRIG.SetBits(sam.ADC_SWTRIG_START) sam.ADC.SWTRIG.SetBits(sam.ADC_SWTRIG_START)
waitADCSync() waitADCSync()
// wait for first conversion to finish to fix same issue as
// https://github.com/arduino/ArduinoCore-samd/issues/446
for !sam.ADC.INTFLAG.HasBits(sam.ADC_INTFLAG_RESRDY) {
}
// Clear the Data Ready flag // Clear the Data Ready flag
sam.ADC.INTFLAG.SetBits(sam.ADC_INTFLAG_RESRDY) sam.ADC.INTFLAG.SetBits(sam.ADC_INTFLAG_RESRDY)
waitADCSync() waitADCSync()