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machine/atsamd21: select internal ground for ADC and scale result correctly to 16-bit

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-04-22 07:59:35 +02:00
parent fa5df4f524
commit b2e96fc35a
1 changed files with 7 additions and 1 deletions
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src/machine/machine_atsamd21.go
+7 -1
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@@ -343,6 +343,12 @@ func (a ADC) Get() uint16 {
sam.ADC.INPUTCTRL |= sam.RegValue(ch << sam.ADC_INPUTCTRL_MUXPOS_Pos)
waitADCSync()
// Select internal ground for ADC input
sam.ADC.INPUTCTRL &^= sam.ADC_INPUTCTRL_MUXNEG_Msk
waitADCSync()
sam.ADC.INPUTCTRL |= sam.RegValue(sam.ADC_INPUTCTRL_MUXNEG_GND << sam.ADC_INPUTCTRL_MUXNEG_Pos)
waitADCSync()
// Enable ADC
sam.ADC.CTRLA |= sam.ADC_CTRLA_ENABLE
waitADCSync()
@@ -368,7 +374,7 @@ func (a ADC) Get() uint16 {
sam.ADC.CTRLA &^= sam.ADC_CTRLA_ENABLE
waitADCSync()
return uint16(val)
return uint16(val) << 4 // scales from 12 to 16-bit result
}
func (a ADC) getADCChannel() uint8 {