machine/rp2040: gpio and adc pin definitions

src/machine/board_pico.go

@@ -4,45 +4,35 @@ package machine
 
 // GPIO pins
 const (
-	GP0  Pin = 0
-	GP1  Pin = 1
-	GP2  Pin = 2
-	GP3  Pin = 3
-	GP4  Pin = 4
-	GP5  Pin = 5
-	GP6  Pin = 6
-	GP7  Pin = 7
-	GP8  Pin = 8
-	GP9  Pin = 9
-	GP10 Pin = 10
-	GP11 Pin = 11
-	GP12 Pin = 12
-	GP13 Pin = 13
-	GP14 Pin = 14
-	GP15 Pin = 15
-	GP16 Pin = 16
-	GP17 Pin = 17
-	GP18 Pin = 18
-	GP19 Pin = 19
-	GP20 Pin = 20
-	GP21 Pin = 21
-	GP22 Pin = 22
-	GP23 Pin = 23
-	GP24 Pin = 24
-	GP25 Pin = 25
-	GP26 Pin = 26
-	GP27 Pin = 27
-	GP28 Pin = 28
-	GP29 Pin = 29
+	GP0  Pin = GPIO0
+	GP1  Pin = GPIO1
+	GP2  Pin = GPIO2
+	GP3  Pin = GPIO3
+	GP4  Pin = GPIO4
+	GP5  Pin = GPIO5
+	GP6  Pin = GPIO6
+	GP7  Pin = GPIO7
+	GP8  Pin = GPIO8
+	GP9  Pin = GPIO9
+	GP10 Pin = GPIO10
+	GP11 Pin = GPIO11
+	GP12 Pin = GPIO12
+	GP13 Pin = GPIO13
+	GP14 Pin = GPIO14
+	GP15 Pin = GPIO15
+	GP16 Pin = GPIO16
+	GP17 Pin = GPIO17
+	GP18 Pin = GPIO18
+	GP19 Pin = GPIO19
+	GP20 Pin = GPIO20
+	GP21 Pin = GPIO21
+	GP22 Pin = GPIO22
+	GP26 Pin = GPIO26
+	GP27 Pin = GPIO27
+	GP28 Pin = GPIO28
 
 	// Onboard LED
-	LED Pin = GP25
-
-	// Analog pins
-	ADC0 = GP26
-	ADC1 = GP27
-	ADC2 = GP28
-	ADC3 = GP29
+	LED Pin = GPIO25
 
 	// Onboard crystal oscillator frequency, in MHz.
 	xoscFreq = 12 // MHz

src/machine/machine_rp2040.go

@@ -7,6 +7,46 @@ import (
 	_ "unsafe"
 )
 
+const (
+	// GPIO pins
+	GPIO0  Pin = 0
+	GPIO1  Pin = 1
+	GPIO2  Pin = 2
+	GPIO3  Pin = 3
+	GPIO4  Pin = 4
+	GPIO5  Pin = 5
+	GPIO6  Pin = 6
+	GPIO7  Pin = 7
+	GPIO8  Pin = 8
+	GPIO9  Pin = 9
+	GPIO10 Pin = 10
+	GPIO11 Pin = 11
+	GPIO12 Pin = 12
+	GPIO13 Pin = 13
+	GPIO14 Pin = 14
+	GPIO15 Pin = 15
+	GPIO16 Pin = 16
+	GPIO17 Pin = 17
+	GPIO18 Pin = 18
+	GPIO19 Pin = 19
+	GPIO20 Pin = 20
+	GPIO21 Pin = 21
+	GPIO22 Pin = 22
+	GPIO23 Pin = 23
+	GPIO24 Pin = 24
+	GPIO25 Pin = 25
+	GPIO26 Pin = 26
+	GPIO27 Pin = 27
+	GPIO28 Pin = 28
+	GPIO29 Pin = 29
+
+	// Analog pins
+	ADC0 Pin = GPIO26
+	ADC1 Pin = GPIO27
+	ADC2 Pin = GPIO28
+	ADC3 Pin = GPIO29
+)
+
 //go:linkname machineInit runtime.machineInit
 func machineInit() {
 	// Reset all peripherals to put system into a known state,

src/machine/machine_rp2040_adc.go

@@ -22,7 +22,7 @@ func InitADC() {
 // Configure configures a ADC pin to be able to be used to read data.
 func (a ADC) Configure(config ADCConfig) {
 	switch a.Pin {
-	case GP26, GP27, GP28, GP29:
+	case ADC0, ADC1, ADC2, ADC3:
 		a.Pin.Configure(PinConfig{Mode: PinAnalog})
 	default:
 		// invalid ADC
@@ -47,13 +47,13 @@ func waitForReady() {
 
 func (a ADC) getADCChannel() uint8 {
 	switch a.Pin {
-	case GP26:
+	case ADC0:
 		return 0
-	case GP27:
+	case ADC1:
 		return 1
-	case GP28:
+	case ADC2:
 		return 2
-	case GP29:
+	case ADC3:
 		return 3
 	default:
 		return 0