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Code Issues Packages Projects Releases 6 Wiki Activity

accept configuration struct for ADC parameters (#1533)

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ardnew
2020-12-15 17:31:13 -06:00
parent 3d6921b0e1
commit 06f231468d
8 changed files with 371 additions and 64 deletions
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src/machine/machine_atsamd21.go
+48 -5
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@@ -307,13 +307,30 @@ func InitADC() {
// set calibration
sam.ADC.CALIB.Set((bias << 8) | linearity)
}
// Configure configures a ADC pin to be able to be used to read data.
func (a ADC) Configure(config ADCConfig) {
// Wait for synchronization
waitADCSync()
var resolution uint32
switch config.Resolution {
case 8:
resolution = sam.ADC_CTRLB_RESSEL_8BIT
case 10:
resolution = sam.ADC_CTRLB_RESSEL_10BIT
case 12:
resolution = sam.ADC_CTRLB_RESSEL_12BIT
case 16:
resolution = sam.ADC_CTRLB_RESSEL_16BIT
default:
resolution = sam.ADC_CTRLB_RESSEL_12BIT
}
// Divide Clock by 32 with 12 bits resolution as default
sam.ADC.CTRLB.Set((sam.ADC_CTRLB_PRESCALER_DIV32 << sam.ADC_CTRLB_PRESCALER_Pos) |
(sam.ADC_CTRLB_RESSEL_12BIT << sam.ADC_CTRLB_RESSEL_Pos))
uint16(resolution<<sam.ADC_CTRLB_RESSEL_Pos))
// Sampling Time Length
sam.ADC.SAMPCTRL.Set(5)
@@ -325,18 +342,44 @@ func InitADC() {
sam.ADC.INPUTCTRL.Set(sam.ADC_INPUTCTRL_MUXNEG_GND << sam.ADC_INPUTCTRL_MUXNEG_Pos)
// Averaging (see datasheet table in AVGCTRL register description)
sam.ADC.AVGCTRL.Set((sam.ADC_AVGCTRL_SAMPLENUM_1 << sam.ADC_AVGCTRL_SAMPLENUM_Pos) |
var samples uint32
switch config.Resolution {
case 1:
samples = sam.ADC_AVGCTRL_SAMPLENUM_1
case 2:
samples = sam.ADC_AVGCTRL_SAMPLENUM_2
case 4:
samples = sam.ADC_AVGCTRL_SAMPLENUM_4
case 8:
samples = sam.ADC_AVGCTRL_SAMPLENUM_8
case 16:
samples = sam.ADC_AVGCTRL_SAMPLENUM_16
case 32:
samples = sam.ADC_AVGCTRL_SAMPLENUM_32
case 64:
samples = sam.ADC_AVGCTRL_SAMPLENUM_64
case 128:
samples = sam.ADC_AVGCTRL_SAMPLENUM_128
case 256:
samples = sam.ADC_AVGCTRL_SAMPLENUM_256
case 512:
samples = sam.ADC_AVGCTRL_SAMPLENUM_512
case 1024:
samples = sam.ADC_AVGCTRL_SAMPLENUM_1024
default:
samples = sam.ADC_AVGCTRL_SAMPLENUM_1
}
sam.ADC.AVGCTRL.Set(uint8(samples<<sam.ADC_AVGCTRL_SAMPLENUM_Pos) |
(0x0 << sam.ADC_AVGCTRL_ADJRES_Pos))
// TODO: use config.Reference to set AREF level
// Analog Reference is AREF pin (3.3v)
sam.ADC.INPUTCTRL.SetBits(sam.ADC_INPUTCTRL_GAIN_DIV2 << sam.ADC_INPUTCTRL_GAIN_Pos)
// 1/2 VDDANA = 0.5 * 3V3 = 1.65V
sam.ADC.REFCTRL.SetBits(sam.ADC_REFCTRL_REFSEL_INTVCC1 << sam.ADC_REFCTRL_REFSEL_Pos)
}
// Configure configures a ADCPin to be able to be used to read data.
func (a ADC) Configure() {
a.Pin.Configure(PinConfig{Mode: PinAnalog})
return
}