From f994c5e2b35acf17db687386d947ee633932ccdd Mon Sep 17 00:00:00 2001
From: Volodymyr Pobochii <v.pobochiy@gmail.com>
Date: Sun, 22 Dec 2024 16:47:25 +0200
Subject: [PATCH] machine: adding support for waveshare-rp2040-tiny

---
 src/machine/board_waveshare_rp2040_tiny.go | 121 +++++++++++++++++++++
 targets/waveshare-rp2040-tiny.json         |  13 +++
 2 files changed, 134 insertions(+)
 create mode 100644 src/machine/board_waveshare_rp2040_tiny.go
 create mode 100644 targets/waveshare-rp2040-tiny.json

diff --git a/src/machine/board_waveshare_rp2040_tiny.go b/src/machine/board_waveshare_rp2040_tiny.go
new file mode 100644
index 0000000000..a3ef354041
--- /dev/null
+++ b/src/machine/board_waveshare_rp2040_tiny.go
@@ -0,0 +1,121 @@
+//go:build waveshare_rp2040_tiny
+
+// This file contains the pin mappings for the Waveshare RP2040-Tiny boards.
+//
+// Waveshare RP2040-Tiny is a microcontroller using the Raspberry Pi RP2040 chip.
+//
+// - https://www.waveshare.com/wiki/RP2040-Tiny
+package machine
+
+// Digital Pins
+const (
+	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 = NoPin
+	GP18 Pin = NoPin
+	GP19 Pin = NoPin
+	GP20 Pin = NoPin
+	GP21 Pin = NoPin
+	GP22 Pin = NoPin
+	GP23 Pin = NoPin
+	GP24 Pin = GPIO24
+	GP25 Pin = GPIO25
+	GP26 Pin = GPIO26
+	GP27 Pin = GPIO27
+	GP28 Pin = GPIO28
+	GP29 Pin = GPIO29
+)
+
+// Analog pins
+const (
+	A0 Pin = GP26
+	A1 Pin = GP27
+	A2 Pin = GP28
+	A3 Pin = GP29
+)
+
+// Onboard LEDs
+const (
+	LED    = GP16
+	WS2812 = GP16
+)
+
+// I2C pins
+const (
+	I2C0_SDA_PIN Pin = GP0
+	I2C0_SCL_PIN Pin = GP1
+	I2C1_SDA_PIN Pin = GP2
+	I2C1_SCL_PIN Pin = GP3
+
+	// default I2C0
+	I2C_SDA_PIN Pin = I2C0_SDA_PIN
+	I2C_SCL_PIN Pin = I2C0_SCL_PIN
+)
+
+// SPI pins
+const (
+	SPI0_RX_PIN  Pin = GP0
+	SPI0_CSN_PIN Pin = GP1
+	SPI0_SCK_PIN Pin = GP2
+	SPI0_TX_PIN  Pin = GP3
+	SPI0_SDO_PIN Pin = SPI0_TX_PIN
+	SPI0_SDI_PIN Pin = SPI0_RX_PIN
+
+	SPI1_RX_PIN  Pin = GP8
+	SPI1_CSN_PIN Pin = GP9
+	SPI1_SCK_PIN Pin = GP10
+	SPI1_TX_PIN  Pin = GP11
+	SPI1_SDO_PIN Pin = SPI1_TX_PIN
+	SPI1_SDI_PIN Pin = SPI1_RX_PIN
+
+	// default SPI0
+	SPI_RX_PIN  Pin = SPI0_RX_PIN
+	SPI_CSN_PIN Pin = SPI0_CSN_PIN
+	SPI_SCK_PIN Pin = SPI0_SCK_PIN
+	SPI_TX_PIN  Pin = SPI0_TX_PIN
+	SPI_SDO_PIN Pin = SPI0_TX_PIN
+	SPI_SDI_PIN Pin = SPI0_RX_PIN
+)
+
+// Onboard crystal oscillator frequency, in MHz.
+const (
+	xoscFreq = 12 // MHz
+)
+
+// UART pins
+const (
+	UART0_TX_PIN = GP0
+	UART0_RX_PIN = GP1
+	UART1_TX_PIN = GP8
+	UART1_RX_PIN = GP9
+
+	// default UART0
+	UART_TX_PIN = UART0_TX_PIN
+	UART_RX_PIN = UART0_RX_PIN
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "RP2040-Tiny"
+	usb_STRING_MANUFACTURER = "Waveshare"
+)
+
+var (
+	usb_VID uint16 = 0x2e8a
+	usb_PID uint16 = 0x0003
+)
diff --git a/targets/waveshare-rp2040-tiny.json b/targets/waveshare-rp2040-tiny.json
new file mode 100644
index 0000000000..74b651b51b
--- /dev/null
+++ b/targets/waveshare-rp2040-tiny.json
@@ -0,0 +1,13 @@
+{
+    "inherits": [
+        "rp2040"
+    ],
+    "serial-port": ["2e8a:0003"],
+    "build-tags": ["waveshare_rp2040_tiny"],
+    "ldflags": [
+        "--defsym=__flash_size=1020K"
+    ],
+    "extra-files": [
+        "targets/pico-boot-stage2.S"
+    ]
+}