From b9638de3887d6a715c95bb4ee311ab4c52c33ff0 Mon Sep 17 00:00:00 2001
From: Guillherme Amaral <gvr@certi.org.br>
Date: Fri, 20 Dec 2019 13:04:34 -0600
Subject: [PATCH] boards/arm/stm32f0l0g0/nucleo-g070rb:  Enable I2C.

---
 .../arm/stm32f0l0g0/nucleo-g070rb/README.txt  |  1 +
 .../nucleo-g070rb/configs/nsh/defconfig       |  5 ++
 .../nucleo-g070rb/src/stm32_bringup.c         | 65 +++++++++++++++++++
 3 files changed, 71 insertions(+)

diff --git a/boards/arm/stm32f0l0g0/nucleo-g070rb/README.txt b/boards/arm/stm32f0l0g0/nucleo-g070rb/README.txt
index 73c0433a05..932a2700be 100644
--- a/boards/arm/stm32f0l0g0/nucleo-g070rb/README.txt
+++ b/boards/arm/stm32f0l0g0/nucleo-g070rb/README.txt
@@ -12,3 +12,4 @@ STATUS
   2019-10-04: Enable basic timer TIM6. Timer example working.
   2019-10-17: Add PWM support. PWM example working.
   2019-11-04: Add button driver and GPIO driver support. Buttons and GPIO examples working.
+  2019-12-20: Add i2C driver driver support and i2C tool.
diff --git a/boards/arm/stm32f0l0g0/nucleo-g070rb/configs/nsh/defconfig b/boards/arm/stm32f0l0g0/nucleo-g070rb/configs/nsh/defconfig
index 28436658c3..da26cc3e4c 100644
--- a/boards/arm/stm32f0l0g0/nucleo-g070rb/configs/nsh/defconfig
+++ b/boards/arm/stm32f0l0g0/nucleo-g070rb/configs/nsh/defconfig
@@ -34,6 +34,9 @@ CONFIG_EXAMPLES_GPIO=y
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXAMPLES_PWM=y
 CONFIG_EXAMPLES_TIMER=y
+CONFIG_I2C=y
+CONFIG_I2CTOOL_MAXADDR=0xff
+CONFIG_I2CTOOL_MINADDR=0x00
 CONFIG_INPUT=y
 CONFIG_INTELHEX_BINARY=y
 CONFIG_MAX_TASKS=8
@@ -60,6 +63,7 @@ CONFIG_START_DAY=19
 CONFIG_START_MONTH=5
 CONFIG_START_YEAR=2013
 CONFIG_STDIO_DISABLE_BUFFERING=y
+CONFIG_STM32F0L0G0_I2C1=y
 CONFIG_STM32F0L0G0_PWM_MULTICHAN=y
 CONFIG_STM32F0L0G0_PWR=y
 CONFIG_STM32F0L0G0_TIM14=y
@@ -100,6 +104,7 @@ CONFIG_STM32F0L0G0_TIM3_CHANNEL4=y
 CONFIG_STM32F0L0G0_TIM3_PWM=y
 CONFIG_STM32F0L0G0_TIM6=y
 CONFIG_STM32F0L0G0_USART2=y
+CONFIG_SYSTEM_I2CTOOL=y
 CONFIG_SYSTEM_NSH=y
 CONFIG_TASK_NAME_SIZE=0
 CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=1536
diff --git a/boards/arm/stm32f0l0g0/nucleo-g070rb/src/stm32_bringup.c b/boards/arm/stm32f0l0g0/nucleo-g070rb/src/stm32_bringup.c
index 53c640ca90..e3a4263ab2 100644
--- a/boards/arm/stm32f0l0g0/nucleo-g070rb/src/stm32_bringup.c
+++ b/boards/arm/stm32f0l0g0/nucleo-g070rb/src/stm32_bringup.c
@@ -3,6 +3,10 @@
  *
  *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
  *   Author: Daniel Pereira Volpato <dpo@certi.org.br>
+ *           Guillherme da Silva Amaral <gvr@certi.org.br>
+ *
+ *   Based on: boards/arm/stm32h7/stm32h747i-disco/src/stm32_bringup.c
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  *   Based on: boards/arm/stm32f0l0g0/nucleo-g071rb/src/stm32_bringup.c
  *   Author: Mateusz Szafoni <raiden00@railab.me>
@@ -50,6 +54,7 @@
 #include <nuttx/leds/userled.h>
 
 #include "nucleo-g070rb.h"
+#include "stm32_i2c.h"
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -69,6 +74,62 @@
 #  define HAVE_DAC2 1
 #endif
 
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_i2c_register
+ *
+ * Description:
+ *   Register one I2C drivers for the I2C tool.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_I2C) && defined(CONFIG_SYSTEM_I2CTOOL)
+static void stm32_i2c_register(int bus)
+{
+  struct i2c_master_s *i2c;
+  int ret;
+
+  i2c = stm32_i2cbus_initialize(bus);
+  if (i2c == NULL)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to get I2C%d interface\n", bus);
+    }
+  else
+    {
+      ret = i2c_register(i2c, bus);
+      if (ret < 0)
+        {
+          syslog(LOG_ERR, "ERROR: Failed to register I2C%d driver: %d\n",
+                 bus, ret);
+          stm32_i2cbus_uninitialize(i2c);
+        }
+    }
+}
+#endif
+
+/****************************************************************************
+ * Name: stm32_i2ctool
+ *
+ * Description:
+ *   Register I2C drivers for the I2C tool.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_I2C) && defined(CONFIG_SYSTEM_I2CTOOL)
+static void stm32_i2ctool(void)
+{
+#ifdef CONFIG_STM32F0L0G0_I2C1
+  stm32_i2c_register(1);
+#endif
+#ifdef CONFIG_STM32F0L0G0_I2C2
+  stm32_i2c_register(2);
+#endif
+}
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -102,6 +163,10 @@ int stm32_bringup(void)
     }
 #endif
 
+#if defined(CONFIG_I2C) && defined(CONFIG_SYSTEM_I2CTOOL)
+  stm32_i2ctool();
+#endif
+
 #ifdef CONFIG_BUTTONS
   /* Register the BUTTON driver */