risc-v/esp32c3: Add driver for I2C peripheral

arch/risc-v/src/esp32c3/Kconfig

@@ -157,6 +157,10 @@ config ESP32C3_UART
 	bool
 	default n
 
+config ESP32C3_I2C
+	bool
+	default n
+
 config ESP32C3_TIMER
 	bool
 	default n
@@ -182,6 +186,11 @@ config ESP32C3_UART1
 	select ESP32C3_UART
 	select UART1_SERIALDRIVER
 
+config ESP32C3_I2C0
+	bool "I2C 0"
+	default n
+	select ESP32C3_I2C
+
 config ESP32C3_TIMER0
 	bool "54-bit Timer 0 (Group 0 Timer 0)"
 	default n
@@ -223,7 +232,26 @@ config ESP32C3_RWDT
 		to have the RTC module reset, please, use the Timers' Module WDTs.
 		They will only reset Main System.
 
-endmenu
+endmenu # ESP32-C3 Peripheral Support
+
+menu "I2C Configuration"
+	depends on ESP32C3_I2C
+
+if ESP32C3_I2C0
+
+config ESP32C3_I2C0_SCLPIN
+	int "I2C0 SCL Pin"
+	default 6
+	range 0 21
+
+config ESP32C3_I2C0_SDAPIN
+	int "I2C0 SDA Pin"
+	default 5
+	range 0 21
+
+endif # ESP32C3_I2C0
+
+endmenu # I2C configuration
 
 menu "UART configuration"
 	depends on ESP32C3_UART

arch/risc-v/src/esp32c3/Make.defs

@@ -59,6 +59,10 @@ ifeq ($(CONFIG_ESP32C3_UART),y)
 CHIP_CSRCS += esp32c3_serial.c
 endif
 
+ifeq ($(CONFIG_ESP32C3_I2C),y)
+CHIP_CSRCS += esp32c3_i2c.c
+endif
+
 ifeq ($(CONFIG_ESP32C3_WDT),y)
 CHIP_CSRCS += esp32c3_wdt.c
 ifeq ($(CONFIG_WATCHDOG),y)

arch/risc-v/src/esp32c3/esp32c3_i2c.h

@@ -0,0 +1,94 @@
+/****************************************************************************
+ * arch/risc-v/src/esp32c3/esp32c3_i2c.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#ifndef __ARCH_RISCV_SRC_ESP32C3_ESP32C3_I2C_H
+#define __ARCH_RISCV_SRC_ESP32C3_ESP32C3_I2C_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/i2c/i2c_master.h>
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp32c3_i2cbus_initialize
+ *
+ * Description:
+ *   Initialize the selected I2C port. And return a pointer to an unique
+ *   instance of struct i2c_master_s. This function may be called to obtain
+ *   multiple instances of the interface, each of which may be set up with a
+ *   different frequency and slave address.
+ *
+ * Input Parameters:
+ *   port        - Port number of the I2C interface to be initialized.
+ *
+ * Returned Value:
+ *   Pointer to valid I2C device structure is returned on success.
+ *   A NULL pointer is returned on failure.
+ *
+ ****************************************************************************/
+
+struct i2c_master_s *esp32c3_i2cbus_initialize(int port);
+
+/****************************************************************************
+ * Name: esp32c3_i2cbus_uninitialize
+ *
+ * Description:
+ *   De-initialize the selected I2C port and power down the device.
+ *
+ * Input Parameters:
+ *   dev         - Device structure as returned by
+ *                 esp32c3_i2cbus_initialize()
+ *
+ * Returned Value:
+ *   OK is returned on success. ERROR is returned when internal reference
+ *   count mismatches or dev points to invalid hardware device.
+ *
+ ****************************************************************************/
+
+int esp32c3_i2cbus_uninitialize(struct i2c_master_s *dev);
+
+#ifdef __cplusplus
+}
+#endif
+#undef EXTERN
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_RISCV_SRC_ESP32C3_ESP32C3_I2C_H */