Try #19076:

boards/hip-badge/Kconfig

@@ -0,0 +1,18 @@
+# Copyright (c) 2023 Benjamin Valentin
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+config BOARD
+    default "hip-badge" if BOARD_HIP_BADGE
+
+config BOARD_HIP_BADGE
+    bool
+    default y
+    select BOARD_COMMON_ESP32C3
+    select CPU_MODEL_ESP32C3
+    select HAS_ESP_JTAG
+    select HAS_PERIPH_I2C
+
+source "$(RIOTBOARD)/common/esp32c3/Kconfig"

boards/hip-badge/Makefile

@@ -0,0 +1,5 @@
+MODULE = board
+
+DIRS = $(RIOTBOARD)/common/esp32c3
+
+include $(RIOTBASE)/Makefile.base

boards/hip-badge/Makefile.dep

@@ -0,0 +1,9 @@
+ifeq (,$(filter stdio_% slipdev_stdio,$(USEMODULE)))
+  USEMODULE += stdio_usb_serial_jtag
+endif
+
+ifneq (,$(filter saul_default,$(USEMODULE)))
+  USEMODULE += sgp30
+endif
+
+include $(RIOTBOARD)/common/esp32c3/Makefile.dep

boards/hip-badge/Makefile.features

@@ -0,0 +1,10 @@
+CPU_MODEL = esp32c3
+
+# common board and CPU features
+include $(RIOTBOARD)/common/esp32c3/Makefile.features
+
+# additional features provided by the board
+FEATURES_PROVIDED += periph_i2c
+
+# unique features provided by the board
+FEATURES_PROVIDED += esp_jtag

boards/hip-badge/Makefile.include

@@ -0,0 +1,3 @@
+PORT_LINUX ?= /dev/ttyACM0
+
+include $(RIOTBOARD)/common/esp32c3/Makefile.include

boards/hip-badge/doc.txt

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2023 Benjamin Valentin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup    boards_hip_badge HiP Badge
+ * @ingroup     boards_esp32c3
+ * @brief       Support for the Hacking in Parallel Badge
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ */
+
+The HiP Badge is a board that was given to participants of the 2022 *Hacking in Parallel* event.
+
+![Image of the HiP badge with custom frame and SAO (I2C) expander](https://camo.githubusercontent.com/834dbee4ed9a9a90480bd1a239e54718f3a9613b694d0a2e26a3b25e55ce2d82/68747470733a2f2f6d61747269782d636c69656e742e6d61747269782e6f72672f5f6d61747269782f6d656469612f72302f646f776e6c6f61642f6d6f6e65726f2e736f6369616c2f757351777a4f656957516e6671546247416845734b684a76)
+
+# Features
+
+ - ESP32-C3FH4AZ SoC
+ - I2C via SAO headers
+ - UART via pin headers
+ - 16 WS2812B LEDs
+ - USB-C Serial/JTAG
+ - 3 User button / 1 Reset button
+ - ST25DV04K NFC/I2C EEPROM (TODO: driver)
+
+# Flashing the device
+
+The device can be programmed using the USB-C Serial/JTAG feature.
+Just plug in a cable to your computer and flash the device with
+
+    make BOARD=hip-badge flash
+
+This should automatically reset the ESP32C3 into bootloader mode and start the download process.
+If for some reason this gets stuck or the badge does not register as a /dev/ttyACMx device, you
+can manually force it into bootloader mode by pressing the reset button (SW3/blue) while holding
+the BOOT button (SW4).
+When doing this, the device will still be in bootloader mode after flashing, you have to press
+the reset button (SW3/blue) again to start your application.
+
+There is currently still a bug in the USB Serial stdio implementation: After flashing or a reboot,
+there is no output. Do a manual reset (press the reset button) to restore output.
+
+# Bugs
+
+The event (and badge) were organized on short notice (6 Weeks), so there are some hardware issues:
+
+ - No WiFi/BLE antenna. There is a pad on the back of the PCB where a socket was supposed to be, but
+   nothing is connected. You can try solder something onto it yourself, but the trace is already long
+   and winded.
+   BLE works with the existing trace alone (on short range), WiFi/ESP Now does not.
+ - IR transceiver broken. Can be fixed with a steady hand?
+ - SGP30 air quality sensor is only populated on some boards (red case)
+ - MAX17048 fuel gauge not populated
+
+# Resources
+
+ - [Badge Clinic](https://wiki.hip-berlin.de/index.php?title=Badge_Clinic)
+ - [Design files](https://gitlab.com/tidklaas/hip-badge/)

boards/hip-badge/hip-badge.config

@@ -0,0 +1 @@
+CONFIG_MODULE_STDIO_USB_SERIAL_JTAG=y

boards/hip-badge/include/board.h

@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2023 Benjamin Valentin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_hip_badge
+ * @brief       Board definitions for the HiP Badge
+ * @{
+ *
+ * @file
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ */
+
+#ifndef BOARD_H
+#define BOARD_H
+
+#include <stdint.h>
+
+/**
+ * @name    Button pin definitions
+ * @{
+ */
+
+/**
+ * @brief   Tact A GPIO pin definition
+ */
+#define BTN0_PIN        GPIO2
+
+/**
+ * @brief    button GPIO mode definition
+ *
+ * Since the GPIO of the button is pulled up with an external resistor, the
+ * mode for the GPIO pin has to be GPIO_IN.
+ */
+#define BTN0_MODE       GPIO_IN
+
+/**
+ * @brief   Default interrupt flank definition for the button GPIO
+ */
+#ifndef BTN0_INT_FLANK
+#define BTN0_INT_FLANK  GPIO_FALLING
+#endif
+
+/**
+ * @brief   Tact B GPIO pin definition
+ */
+#define BTN1_PIN        GPIO8
+
+/**
+ * @brief   Default button GPIO mode definition
+ *
+ * Since the GPIO of the button is pulled up with an external resistor, the
+ * mode for the GPIO pin has to be GPIO_IN.
+ */
+#define BTN1_MODE       GPIO_IN
+
+/**
+ * @brief   Default interrupt flank definition for the button GPIO
+ */
+#ifndef BTN1_INT_FLANK
+#define BTN1_INT_FLANK  GPIO_FALLING
+#endif
+
+/**
+ * @brief   BOOT button GPIO pin definition
+ *
+ * The HiP-Badge has a BOOT button connected to GPIO9, which can be
+ * used as button during normal operation. Since the GPIO9 pin is pulled up,
+ * the button signal is inverted, i.e., pressing the button will give a
+ * low signal.
+ */
+#define BTN2_PIN        GPIO9
+
+/**
+ * @brief   Default button GPIO mode definition
+ */
+#define BTN2_MODE       GPIO_IN_PU
+
+/**
+ * @brief   Default interrupt flank definition for the button GPIO
+ */
+#ifndef BTN2_INT_FLANK
+#define BTN2_INT_FLANK  GPIO_FALLING
+#endif
+/** @} */
+
+/**
+ * @brief   WS281x LEDs are connected to GPIO10
+ */
+#ifndef WS281X_PARAM_PIN
+#define WS281X_PARAM_PIN    GPIO10
+#endif
+
+/**
+ * @brief   There are 16 WS281x LEDs
+ */
+#ifndef WS281X_PARAM_NUMOF
+#define WS281X_PARAM_NUMOF  16
+#endif
+
+/* include common board definitions as last step */
+#include "board_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif
+
+#endif /* BOARD_H */
+/** @} */

boards/hip-badge/include/gpio_params.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2023 Benjamin Valentin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_hip_badge
+ * @brief       Board specific configuration of direct mapped GPIOs
+ * @file
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * @{
+ */
+
+#ifndef GPIO_PARAMS_H
+#define GPIO_PARAMS_H
+
+#include "board.h"
+#include "saul/periph.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   LED and Button configuration
+ */
+static const  saul_gpio_params_t saul_gpio_params[] =
+{
+    {
+        .name = "SW1",
+        .pin = BTN0_PIN,
+        .mode = BTN0_MODE,
+        .flags = SAUL_GPIO_INVERTED
+    },
+    {
+        .name = "SW2",
+        .pin = BTN1_PIN,
+        .mode = BTN1_MODE,
+        .flags = SAUL_GPIO_INVERTED
+    },
+    {
+        .name = "Boot",
+        .pin = BTN2_PIN,
+        .mode = BTN2_MODE,
+        .flags = SAUL_GPIO_INVERTED
+    },
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GPIO_PARAMS_H */
+/** @} */

boards/hip-badge/include/periph_conf.h

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2023 Benjamin Valentin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_hip_badge
+ * @brief       Peripheral configurations for the HiP Badge
+ * @{
+ *
+ * @file
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ */
+
+#ifndef PERIPH_CONF_H
+#define PERIPH_CONF_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name   I2C configuration
+ *
+ * One I2C interface I2C_DEV(0) is defined and available via the SAO headers.
+ *
+ * The GPIOs listed in the configuration are only initialized as I2C signals
+ * when module `periph_i2c` is used. Otherwise they are not allocated and
+ * can be used for other purposes.
+ *
+ * @{
+ */
+#ifndef I2C0_SPEED
+#define I2C0_SPEED  I2C_SPEED_FAST  /**< I2C bus speed of I2C_DEV(0) */
+#endif
+#ifndef I2C0_SCL
+#define I2C0_SCL    GPIO6           /**< SCL signal of I2C_DEV(0) */
+#endif
+#ifndef I2C0_SDA
+#define I2C0_SDA    GPIO5           /**< SDA signal of I2C_DEV(0) */
+#endif
+/** @} */
+
+/**
+ * @name   UART configuration
+ *
+ * ESP32-C3 provides 2 UART interfaces at maximum:
+ *
+ * UART_DEV(0) uses fixed standard configuration.<br>
+ * UART_DEV(1) is used for IrDA (untested).<br>
+ *
+ * @{
+ */
+#define UART0_TXD   GPIO21  /**< direct I/O pin for UART_DEV(0) TxD, can't be changed */
+#define UART0_RXD   GPIO20  /**< direct I/O pin for UART_DEV(0) RxD, can't be changed */
+
+#define UART1_TXD   GPIO7   /**< IrDA TX - Bad Choice? */
+#define UART1_RXD   GPIO3   /**< IrDA RX - Bad Choice? */
+/** @} */
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif
+
+/* include common peripheral definitions as last step */
+#include "periph_conf_common.h"
+
+#endif /* PERIPH_CONF_H */
+/** @} */

cpu/esp32/Makefile

@@ -25,6 +25,10 @@ ifneq (, $(filter esp_freertos, $(USEMODULE)))
     DIRS += freertos
 endif
 
+ifneq (, $(filter stdio_usb_serial_jtag, $(USEMODULE)))
+    DIRS += stdio_usb_serial_jtag
+endif
+
 ifneq (,$(filter esp_wifi% esp_eth, $(USEMODULE)))
     SRC += esp_ztimer.c
 endif

cpu/esp32/Makefile.dep

@@ -166,6 +166,16 @@ ifneq (,$(filter shell,$(USEMODULE)))
   USEMODULE += ps
 endif
 
+ifneq (,$(filter stdio_usb_serial_jtag, $(USEMODULE)))
+  USEMODULE += tsrb
+  ifneq (,$(filter stdin,$(USEMODULE)))
+    USEMODULE += stdio_usb_serial_jtag_rx
+  endif
+endif
+ifneq (,$(filter stdio_usb_serial_jtag_rx, $(USEMODULE)))
+  USEMODULE += isrpipe
+endif
+
 ifneq (,$(filter tinyusb_portable_espressif,$(USEMODULE)))
   USEMODULE += esp_idf_usb
 endif