Add stm32L4 I2C driver

arch/arm/src/stm32l4/Kconfig

@@ -185,7 +185,7 @@ config STM32L4_QUADSPI
 
 comment "APB1 Peripherals"
 
-config STM32_PWR
+config STM32L4_PWR
 	bool "PWR"
 	default n
 
@@ -613,6 +613,44 @@ config STM32L4_SPI_DMA
 
 endmenu
 
-#todo i2c config
+menu "I2C Configuration"
+	depends on STM32L4_I2C
+
+config STM32L4_I2C_DYNTIMEO
+	bool "Use dynamic timeouts"
+	default n
+	depends on STM32L4_I2C
+
+config STM32L4_I2C_DYNTIMEO_USECPERBYTE
+	int "Timeout Microseconds per Byte"
+	default 500
+	depends on STM32L4_I2C_DYNTIMEO
+
+config STM32L4_I2C_DYNTIMEO_STARTSTOP
+	int "Timeout for Start/Stop (Milliseconds)"
+	default 1000
+	depends on STM32L4_I2C_DYNTIMEO
+
+config STM32L4_I2CTIMEOSEC
+	int "Timeout seconds"
+	default 0
+	depends on STM32L4_I2C
+
+config STM32L4_I2CTIMEOMS
+	int "Timeout Milliseconds"
+	default 500
+	depends on STM32L4_I2C && !STM32L4_I2C_DYNTIMEO
+
+config STM32L4_I2CTIMEOTICKS
+	int "Timeout for Done and Stop (ticks)"
+	default 500
+	depends on STM32L4_I2C && !STM32L4_I2C_DYNTIMEO
+
+config STM32L4_I2C_DUTY16_9
+	bool "Frequency with Tlow/Thigh = 16/9 "
+	default n
+	depends on STM32L4_I2C
+
+endmenu
 
 endif # ARCH_CHIP_STM32L4

arch/arm/src/stm32l4/Make.defs

@@ -115,7 +115,7 @@ CHIP_ASRCS  =
 CHIP_CSRCS  = stm32l4_allocateheap.c stm32l4_exti_gpio.c stm32l4_gpio.c
 CHIP_CSRCS += stm32l4_idle.c stm32l4_irq.c stm32l4_lowputc.c stm32l4_rcc.c
 CHIP_CSRCS += stm32l4_serial.c stm32l4_start.c stm32l4_waste.c
-CHIP_CSRCS += stm32l4_spi.c
+CHIP_CSRCS += stm32l4_spi.c stm32_i2c.c
 
 ifneq ($(CONFIG_SCHED_TICKLESS),y)
 CHIP_CSRCS += stm32l4_timerisr.c
@@ -136,7 +136,7 @@ ifeq ($(CONFIG_STM32L4_DMA),y)
 CHIP_CSRCS += stm32l4_dma.c
 endif
 
-ifeq ($(CONFIG_STM32_PWR),y)
+ifeq ($(CONFIG_STM32L4_PWR),y)
 CHIP_CSRCS += stm32l4_exti_pwr.c
 endif
 

arch/arm/src/stm32l4/stm32l4.h

@@ -93,4 +93,4 @@
 #include "stm32l4_wdg.h"
 #include "stm32l4_lowputc.h"
 
-#endif /* __ARCH_ARM_SRC_STM32_STM32_H */
+#endif /* __ARCH_ARM_SRC_STM32L4_STM32L4_H */

arch/arm/src/stm32l4/stm32l4_gpio.h

@@ -374,4 +374,4 @@ void stm32l4_gpioinit(void);
 #endif
 
 #endif /* __ASSEMBLY__ */
-#endif /* __ARCH_ARM_SRC_STM32_STM32_GPIO_H */
+#endif /* __ARCH_ARM_SRC_STM32L4_STM32L4_GPIO_H */

arch/arm/src/stm32l4/stm32l4_i2c.h

@@ -0,0 +1,104 @@
+/****************************************************************************
+ * arch/arm/src/stm32l4/stm32l4_i2c.h
+ *
+ *   Copyright (C) 2009, 2011, 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_STM32L4_STM32L4_I2C_H
+#define __ARCH_ARM_SRC_STM32L4_STM32L4_I2C_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/i2c/i2c_master.h>
+
+#include "chip.h"
+#include "chip/stm32l4_i2c.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* If a dynamic timeout is selected, then a non-negative, non-zero micro-
+ * seconds per byte value must be provided as well.
+ */
+
+#ifdef CONFIG_STM32L4_I2C_DYNTIMEO
+#  if CONFIG_STM32L4_I2C_DYNTIMEO_USECPERBYTE < 1
+#    warning "Ignoring CONFIG_STM32L4_I2C_DYNTIMEO because of CONFIG_STM32L4_I2C_DYNTIMEO_USECPERBYTE"
+#    undef CONFIG_STM32L4_I2C_DYNTIMEO
+#  endif
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32l4_i2cbus_initialize
+ *
+ * Description:
+ *   Initialize the selected I2C port. And return a unique instance of struct
+ *   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 Parameter:
+ *   Port number (for hardware that has multiple I2C interfaces)
+ *
+ * Returned Value:
+ *   Valid I2C device structure reference on succcess; a NULL on failure
+ *
+ ****************************************************************************/
+
+FAR struct i2c_master_s *stm32l4_i2cbus_initialize(int port);
+
+/****************************************************************************
+ * Name: stm32l4_i2cbus_uninitialize
+ *
+ * Description:
+ *   De-initialize the selected I2C port, and power down the device.
+ *
+ * Input Parameter:
+ *   Device structure as returned by the stm32l4_i2cbus_initialize()
+ *
+ * Returned Value:
+ *   OK on success, ERROR when internal reference count mismatch or dev
+ *   points to invalid hardware device.
+ *
+ ****************************************************************************/
+
+int stm32l4_i2cbus_uninitialize(FAR struct i2c_master_s *dev);
+
+#endif /* __ARCH_ARM_SRC_STM32L4_STM32L4_I2C_H */

arch/arm/src/stm32l4/stm32l4_lowputc.h

@@ -76,5 +76,5 @@ void stm32l4_lowsetup(void);
 #endif
 
 #endif /* __ASSEMBLY__ */
-#endif /* __ARCH_ARM_SRC_STM32_STM32_LOWPUTC_H */
+#endif /* __ARCH_ARM_SRC_STM32L4_STM32L4_LOWPUTC_H */
 

arch/arm/src/stm32l4/stm32l4_rcc.c

@@ -115,7 +115,7 @@ void stm32l4_clockconfig(void)
 
   rcc_reset();
 
-#if defined(CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG)
+#if defined(CONFIG_ARCH_BOARD_STM32L4_CUSTOM_CLOCKCONFIG)
 
   /* Invoke Board Custom Clock Configuration */