machine/rp2040: gpio and adc pin definitions

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,