From 1d9f26cee1f1501b09647186a25ba29aa6a0c58c Mon Sep 17 00:00:00 2001
From: Johann Freymuth <mail@jfreymuth.de>
Date: Wed, 8 May 2024 13:23:45 +0200
Subject: [PATCH] targets: add support for m5paper

---
 GNUmakefile                  |   2 +
 src/machine/board_m5paper.go | 112 +++++++++++++++++++++++++++++++++++
 targets/m5paper.json         |   5 ++
 3 files changed, 119 insertions(+)
 create mode 100644 src/machine/board_m5paper.go
 create mode 100644 targets/m5paper.json

diff --git a/GNUmakefile b/GNUmakefile
index 5496cbb0..cbc18c14 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -766,6 +766,8 @@ ifneq ($(XTENSA), 0)
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target m5stick-c           examples/serial
 	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target m5paper             examples/serial
+	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target mch2022             examples/serial
 	@$(MD5SUM) test.bin
 endif
diff --git a/src/machine/board_m5paper.go b/src/machine/board_m5paper.go
new file mode 100644
index 00000000..7c20f4db
--- /dev/null
+++ b/src/machine/board_m5paper.go
@@ -0,0 +1,112 @@
+//go:build m5paper
+
+package machine
+
+const (
+	IO0  = GPIO0
+	IO1  = GPIO1
+	IO2  = GPIO2
+	IO3  = GPIO3
+	IO4  = GPIO4
+	IO5  = GPIO5
+	IO6  = GPIO6
+	IO7  = GPIO7
+	IO8  = GPIO8
+	IO9  = GPIO9
+	IO10 = GPIO10
+	IO11 = GPIO11
+	IO12 = GPIO12
+	IO13 = GPIO13
+	IO14 = GPIO14
+	IO15 = GPIO15
+	IO16 = GPIO16
+	IO17 = GPIO17
+	IO18 = GPIO18
+	IO19 = GPIO19
+	IO21 = GPIO21
+	IO22 = GPIO22
+	IO23 = GPIO23
+	IO25 = GPIO25
+	IO26 = GPIO26
+	IO27 = GPIO27
+	IO32 = GPIO32
+	IO33 = GPIO33
+	IO34 = GPIO34
+	IO35 = GPIO35
+	IO36 = GPIO36
+	IO37 = GPIO37
+	IO38 = GPIO38
+	IO39 = GPIO39
+)
+
+const (
+	POWER_PIN     = IO2
+	EXT_POWER_PIN = IO5
+	EPD_POWER_PIN = IO23
+
+	// Buttons
+	BUTTON_RIGHT = IO39
+	BUTTON_PUSH  = IO38
+	BUTTON_LEFT  = IO37
+	BUTTON       = BUTTON_PUSH
+
+	// Touch Screen Interrupt
+	TOUCH_INT = IO36
+)
+
+// SPI pins
+const (
+	SPI0_SCK_PIN = IO14
+	SPI0_SDO_PIN = IO12
+	SPI0_SDI_PIN = IO13
+
+	// EPD (IT8951)
+	EPD_SCK_PIN  = SPI0_SCK_PIN
+	EPD_SDO_PIN  = SPI0_SDO_PIN
+	EPD_SDI_PIN  = SPI0_SDI_PIN
+	EPD_CS_PIN   = IO15
+	EPD_BUSY_PIN = IO27
+
+	// SD CARD
+	SDCARD_SCK_PIN = SPI0_SCK_PIN
+	SDCARD_SDO_PIN = SPI0_SDO_PIN
+	SDCARD_SDI_PIN = SPI0_SDI_PIN
+	SDCARD_CS_PIN  = IO4
+)
+
+// I2C pins
+const (
+	SDA0_PIN = IO21
+	SCL0_PIN = IO22
+
+	SDA_PIN = SDA0_PIN
+	SCL_PIN = SCL0_PIN
+
+	I2C_TEMP_ADDR  = 0x44 // temperature sensor (SHT30)
+	I2C_CLOCK_ADDR = 0x51 // real time clock (BM8563)
+	I2C_TOUCH_ADDR = 0x5D // touch screen controller (GT911)
+)
+
+// ADC pins
+const (
+	ADC1 Pin = IO35
+	ADC2 Pin = IO36
+
+	BATTERY_ADC_PIN = ADC1
+)
+
+// DAC pins
+const (
+	DAC1 Pin = IO25
+	DAC2 Pin = IO26
+)
+
+// UART pins
+const (
+	// UART0 (CP2104)
+	UART0_TX_PIN = IO1
+	UART0_RX_PIN = IO3
+
+	UART_TX_PIN = UART0_TX_PIN
+	UART_RX_PIN = UART0_RX_PIN
+)
diff --git a/targets/m5paper.json b/targets/m5paper.json
new file mode 100644
index 00000000..9ee5d43b
--- /dev/null
+++ b/targets/m5paper.json
@@ -0,0 +1,5 @@
+{
+	"inherits": ["esp32"],
+	"build-tags": ["m5paper"],
+	"serial-port": ["1a86:55d4"]
+}