add UART

src/machine/machine_rp2.go

@@ -4,6 +4,7 @@ package machine
 
 import (
 	"device/rp"
+	"runtime/interrupt"
 	"runtime/volatile"
 	"unsafe"
 )
@@ -18,6 +19,26 @@ const (
 	_PICO_SPINLOCK_ID_IRQ = 9
 )
 
+// UART on the RP2040
+var (
+	UART0  = &_UART0
+	_UART0 = UART{
+		Buffer: NewRingBuffer(),
+		Bus:    rp.UART0,
+	}
+
+	UART1  = &_UART1
+	_UART1 = UART{
+		Buffer: NewRingBuffer(),
+		Bus:    rp.UART1,
+	}
+)
+
+func init() {
+	UART0.Interrupt = interrupt.New(rp.IRQ_UART0_IRQ, _UART0.handleInterrupt)
+	UART1.Interrupt = interrupt.New(rp.IRQ_UART1_IRQ, _UART1.handleInterrupt)
+}
+
 //go:linkname machineInit runtime.machineInit
 func machineInit() {
 	// Reset all peripherals to put system into a known state,
@@ -96,7 +117,7 @@ const (
 )
 
 // DMA channels usable on the RP2040.
-var dmaChannels = (*[12]dmaChannel)(unsafe.Pointer(rp.DMA))
+var dmaChannels = (*[12 + 4*rp2350ExtraReg]dmaChannel)(unsafe.Pointer(rp.DMA))
 
 //go:inline
 func boolToBit(a bool) uint32 {

src/machine/machine_rp2_2350.go

@@ -22,6 +22,16 @@ const (
 		rp.RESETS_RESET_USBCTRL
 )
 
+// UART pins
+const (
+	UART0_TX_PIN = GPIO0
+	UART0_RX_PIN = GPIO1
+	UART1_TX_PIN = GPIO8
+	UART1_RX_PIN = GPIO9
+	UART_TX_PIN  = UART0_TX_PIN
+	UART_RX_PIN  = UART0_RX_PIN
+)
+
 const (
 	PinOutput PinMode = iota
 	PinInput

src/machine/machine_rp2040_uart.go → src/machine/machine_rp2_uart.go

@@ -1,4 +1,4 @@
-//go:build rp2040
+//go:build rp2040 || rp2350
 
 package machine
 

src/machine/uart.go

@@ -1,4 +1,4 @@
-//go:build atmega || esp || nrf || sam || sifive || stm32 || k210 || nxp || rp2040
+//go:build atmega || esp || nrf || sam || sifive || stm32 || k210 || nxp || rp2040 || rp2350
 
 package machine