Adding support for waveshare rp2040-zero (#3321)

machine: adding support for waveshare rp2040-zero

Makefile

@@ -622,6 +622,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=xiao-rp2040         examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=waveshare-rp2040-zero examples/echo
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=challenger-rp2040    examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=trinkey-qt2040      examples/temp

src/machine/board_waveshare-rp2040-zero.go

@@ -0,0 +1,128 @@
+//go:build waveshare_rp2040_zero
+// +build waveshare_rp2040_zero
+
+// This file contains the pin mappings for the Waveshare RP2040-Zero boards.
+//
+// Waveshare RP2040-Zero is a microcontroller using the Raspberry Pi RP2040 chip.
+//
+// - https://www.waveshare.com/wiki/RP2040-Zero
+package machine
+
+import (
+	"device/rp"
+	"runtime/interrupt"
+)
+
+// Digital Pins
+const (
+	D0  Pin = GPIO0
+	D1  Pin = GPIO1
+	D2  Pin = GPIO2
+	D3  Pin = GPIO3
+	D4  Pin = GPIO4
+	D5  Pin = GPIO5
+	D6  Pin = GPIO6
+	D7  Pin = GPIO7
+	D8  Pin = GPIO8
+	D9  Pin = GPIO9
+	D10 Pin = GPIO10
+	D11 Pin = GPIO11
+	D12 Pin = GPIO12
+	D13 Pin = GPIO13
+	D14 Pin = GPIO14
+	D15 Pin = GPIO15
+	D16 Pin = GPIO16
+	D17 Pin = GPIO17
+	D18 Pin = GPIO18
+	D19 Pin = GPIO19
+	D20 Pin = GPIO20
+	D21 Pin = GPIO21
+	D22 Pin = GPIO22
+	D23 Pin = GPIO23
+	D24 Pin = GPIO24
+	D25 Pin = GPIO25
+	D26 Pin = GPIO26
+	D27 Pin = GPIO27
+	D28 Pin = GPIO28
+	D29 Pin = GPIO29
+)
+
+// Analog pins
+const (
+	A0 Pin = D26
+	A1 Pin = D27
+	A2 Pin = D28
+	A3 Pin = D29
+)
+
+// Onboard LEDs
+const (
+	NEOPIXEL = GPIO16
+)
+
+// I2C pins
+const (
+	I2C0_SDA_PIN Pin = D0
+	I2C0_SCL_PIN Pin = D1
+
+	I2C1_SDA_PIN Pin = D2
+	I2C1_SCL_PIN Pin = D3
+)
+
+// SPI pins
+const (
+	SPI0_SCK_PIN Pin = D6
+	SPI0_SDO_PIN Pin = D3
+	SPI0_SDI_PIN Pin = D4
+
+	SPI1_SCK_PIN Pin = D10
+	SPI1_SDO_PIN Pin = D11
+	SPI1_SDI_PIN Pin = D12
+)
+
+// Onboard crystal oscillator frequency, in MHz.
+const (
+	xoscFreq = 12 // MHz
+)
+
+// UART pins
+const (
+	UART0_TX_PIN = GPIO0
+	UART0_RX_PIN = GPIO1
+	UART_TX_PIN  = UART0_TX_PIN
+	UART_RX_PIN  = UART0_RX_PIN
+	UART1_TX_PIN = GPIO8
+	UART1_RX_PIN = GPIO9
+)
+
+// UART on the RP2040
+var (
+	UART0  = &_UART0
+	_UART0 = UART{
+		Buffer: NewRingBuffer(),
+		Bus:    rp.UART0,
+	}
+	UART1  = &_UART1
+	_UART1 = UART{
+		Buffer: NewRingBuffer(),
+		Bus:    rp.UART1,
+	}
+)
+
+var DefaultUART = UART0
+
+func init() {
+	UART0.Interrupt = interrupt.New(rp.IRQ_UART0_IRQ, _UART0.handleInterrupt)
+	UART1.Interrupt = interrupt.New(rp.IRQ_UART1_IRQ, _UART1.handleInterrupt)
+}
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "RP2040-Zero"
+	usb_STRING_MANUFACTURER = "Waveshare"
+)
+
+var (
+	usb_VID uint16 = 0x2e8a
+	usb_PID uint16 = 0x0003
+)

targets/waveshare-rp2040-zero.json

@@ -0,0 +1,11 @@
+{
+    "inherits": [
+        "rp2040"
+    ],
+    "serial-port": ["2e8a:0003"],
+    "build-tags": ["waveshare_rp2040_zero"],
+    "linkerscript": "targets/waveshare-rp2040-zero.ld",
+    "extra-files": [
+        "targets/pico-boot-stage2.S"
+    ]
+}

targets/waveshare-rp2040-zero.ld

@@ -0,0 +1,10 @@
+
+MEMORY
+{
+    /* Reserve exactly 256 bytes at start of flash for second stage bootloader */
+    BOOT2_TEXT (rx) : ORIGIN = 0x10000000, LENGTH = 256
+    FLASH_TEXT (rx) : ORIGIN = 0x10000000 + 256, LENGTH = 1020K - 256
+    RAM (rwx)       : ORIGIN = 0x20000000, LENGTH = 256k
+}
+
+INCLUDE "targets/rp2040.ld"