From 20c11e918f2da048c12c765d625ed5bccd2afdad Mon Sep 17 00:00:00 2001
From: Alan Carvalho de Assis <acassis@gmail.com>
Date: Sat, 6 Jan 2018 17:10:32 -0600
Subject: [PATCH] configs/stm32f103-minimum: Add AT24 EEPROM support on
 STM32F103-Minimum board

---
 configs/stm32f103-minimum/Kconfig             | 30 +++++++++++++++
 configs/stm32f103-minimum/src/Makefile        |  6 +++
 configs/stm32f103-minimum/src/stm32_bringup.c | 11 ++++++
 .../stm32f103-minimum/src/stm32f103_minimum.h | 37 +++++++++++++++++++
 4 files changed, 84 insertions(+)

diff --git a/configs/stm32f103-minimum/Kconfig b/configs/stm32f103-minimum/Kconfig
index 9771d9e76b..c96e8902fc 100644
--- a/configs/stm32f103-minimum/Kconfig
+++ b/configs/stm32f103-minimum/Kconfig
@@ -5,6 +5,36 @@
 
 if ARCH_BOARD_STM32F103_MINIMUM
 
+config STM32F103MINIMUM_AT24_BLOCKMOUNT
+	bool "AT24 Serial EEPROM auto-mount"
+	default n
+	depends on NSH_ARCHINIT && STM32_I2C1 && MTD_AT24XX
+	---help---
+		Automatically initialize the AT24 I2C EEPROM driver when NSH starts.
+
+choice
+	prompt "AT24 serial EPPROM configuration"
+	default STM32F103MINIMUM_AT24_FTL
+	depends on STM32F103MINIMUM_AT24_BLOCKMOUNT
+
+config STM32F103MINIMUM_AT24_FTL
+	bool "Create AT24 block driver"
+	---help---
+		Create the MTD driver for the AT24 and "wrap" the AT24 as a standard
+		block driver that could then, for example, be mounted using FAT or
+		any other file system.  Any file system may be used, but there will
+		be no wear-leveling.
+
+config STM32F103MINIMUM_AT24_NXFFS
+	bool "Create AT24 NXFFS file system"
+	depends on FS_NXFFS
+	---help---
+		Create the MTD driver for the AT24 and mount the AT24 device as
+		a wear-leveling, NuttX FLASH file system (NXFFS).  The downside of
+		NXFFS is that it can be very slow.
+
+endchoice # AT24 serial EPPROM configuration
+
 config STM32F103MINIMUM_FLASH
 	bool "MTD driver for external 4Mbyte W25Q32FV FLASH on SPI1"
 	default n
diff --git a/configs/stm32f103-minimum/src/Makefile b/configs/stm32f103-minimum/src/Makefile
index 0784c5b21b..d2a4afcfbe 100644
--- a/configs/stm32f103-minimum/src/Makefile
+++ b/configs/stm32f103-minimum/src/Makefile
@@ -85,6 +85,12 @@ ifeq ($(CONFIG_MTD_W25),y)
   CSRCS += stm32_w25.c
 endif
 
+ifeq ($(CONFIG_MTD_AT24XX),y)
+ifeq ($(CONFIG_STM32_I2C1),y)
+CSRCS += stm32_at24.c
+endif
+endif
+
 ifeq ($(CONFIG_AUDIO_TONE),y)
   CSRCS += stm32_tone.c
 endif
diff --git a/configs/stm32f103-minimum/src/stm32_bringup.c b/configs/stm32f103-minimum/src/stm32_bringup.c
index b41282ceb2..dec8bea5e1 100644
--- a/configs/stm32f103-minimum/src/stm32_bringup.c
+++ b/configs/stm32f103-minimum/src/stm32_bringup.c
@@ -188,6 +188,17 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef HAVE_AT24
+  /* Initialize the AT24 driver */
+
+  ret = stm32_at24_automount(AT24_MINOR);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_at24_automount failed: %d\n", ret);
+      return ret;
+    }
+#endif /* HAVE_AT24 */
+
 #ifdef CONFIG_PWM
   /* Initialize PWM and register the PWM device. */
 
diff --git a/configs/stm32f103-minimum/src/stm32f103_minimum.h b/configs/stm32f103-minimum/src/stm32f103_minimum.h
index 88a5f701cf..17db4be949 100644
--- a/configs/stm32f103-minimum/src/stm32f103_minimum.h
+++ b/configs/stm32f103-minimum/src/stm32f103_minimum.h
@@ -44,6 +44,43 @@
 #include <nuttx/compiler.h>
 #include <stdint.h>
 
+#define HAVE_AT24 1
+
+/* AT24 Serial EEPROM */
+
+#define AT24_I2C_BUS   1 /* AT24C256 connected to I2C1 */
+#define AT24_MINOR     0
+
+#if !defined(CONFIG_MTD_AT24XX) || !defined(CONFIG_STM32_I2C1)
+#  undef HAVE_AT24
+#endif
+
+/* Can't support AT24 features if mountpoints are disabled or if we were not
+ * asked to mount the AT25 part
+ */
+
+#if defined(CONFIG_DISABLE_MOUNTPOINT) || \
+   !defined(CONFIG_STM32F103MINIMUM_AT24_BLOCKMOUNT)
+#  undef HAVE_AT24
+#endif
+
+/* If we are going to mount the AT24, then they user must also have told
+ * us what to do with it by setting one of these.
+ */
+
+#ifndef CONFIG_FS_NXFFS
+#  undef CONFIG_STM32F103MINIMUM_AT24_NXFFS
+#endif
+
+#if !defined(CONFIG_STM32F103MINIMUM_AT24_FTL) && \
+    !defined(CONFIG_STM32F103MINIMUM_AT24_NXFFS)
+#  undef HAVE_AT24
+#endif
+
+#ifndef HAVE_AT24
+#error "HAVE_AT24 is not defined!\n"
+#endif
+
 /************************************************************************************
  * Pre-processor Definitions
  ************************************************************************************/