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lincolngill
9eb4a6268a
machine/rp2040: ADC changes, including * Add rp2040 ADC mux channel support. Internal temp sensor reading and fix for incorrect setting of CS.AINSEL reg bits * Reset ADC ref voltage in InitADC
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
// Reads multiple rp2040 ADC channels concurrently. Including the internal temperature sensor
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package main
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import (
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"fmt"
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"machine"
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"time"
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)
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type celsius float32
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func (c celsius) String() string {
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return fmt.Sprintf("%4.1f℃", c)
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}
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// rp2040 ADC is 12 bits. Reading are shifted <<4 to fill the 16-bit range.
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var adcReading [3]uint16
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func readADC(a machine.ADC, w time.Duration, i int) {
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for {
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adcReading[i] = a.Get()
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time.Sleep(w)
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}
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}
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func main() {
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machine.InitADC()
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a0 := machine.ADC{machine.ADC0} // GPIO26 input
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a1 := machine.ADC{machine.ADC1} // GPIO27 input
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a2 := machine.ADC{machine.ADC2} // GPIO28 input
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t := machine.ADC_TEMP_SENSOR // Internal Temperature sensor
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// Configure sets the GPIOs to PinAnalog mode
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a0.Configure(machine.ADCConfig{})
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a1.Configure(machine.ADCConfig{})
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a2.Configure(machine.ADCConfig{})
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// Configure powers on the temperature sensor
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t.Configure(machine.ADCConfig{})
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// Safe to read concurrently
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go readADC(a0, 10*time.Millisecond, 0)
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go readADC(a1, 17*time.Millisecond, 1)
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go readADC(a2, 29*time.Millisecond, 2)
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for {
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fmt.Printf("ADC0: %5d ADC1: %5d ADC2: %5d Temp: %v\n\r", adcReading[0], adcReading[1], adcReading[2], celsius(float32(t.ReadTemperature())/1000))
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time.Sleep(1000 * time.Millisecond)
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}
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}
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