Add support for spi sdcard with card detection logic

configs/stm32butterfly2/include/board.h

@@ -49,7 +49,7 @@
 #include "stm32_rcc.h"
 
 /*******************************************************************************
- * Pre-processor Definitions 
+ * Pre-processor Definitions
  ******************************************************************************/
 
 /* Clocking *******************************************************************/
@@ -100,7 +100,7 @@
 #define STM32_APB1_TIM5_CLKIN   (2*STM32_PCLK1_FREQUENCY)
 #define STM32_APB1_TIM6_CLKIN   (2*STM32_PCLK1_FREQUENCY)
 #define STM32_APB1_TIM7_CLKIN   (2*STM32_PCLK1_FREQUENCY)
- 
+
 /* LED definitions ************************************************************/
 /* There are four LEDs on stm32butterfly2 board that can be controlled by
  * software. All pulled high and van be illuminated by driving the output low.
@@ -154,6 +154,12 @@
 #  error "CONFIG_STM32_ADC2 is not supported"
 #endif
 
+/* SPI configuration. Only SPI1 is supported */
+
+#ifdef CONFIG_STM32_SPI2
+#  error "CONFIG_STM32_SPI2 is not supported"
+#endif
+
 /*******************************************************************************
  * Public Data
  ******************************************************************************/
@@ -178,7 +184,7 @@ extern "C" {
  * Description:
  *      Initializes board specific LEDS
  ******************************************************************************/
- void stm32_led_initialize(void);
+void stm32_led_initialize(void);
 
 /*******************************************************************************
  * Name: stm32_boardinitialize

configs/stm32butterfly2/nshnet/defconfig

@@ -43,38 +43,7 @@ CONFIG_RAW_BINARY=y
 # Debug Options
 #
 CONFIG_DEBUG_ALERT=y
-CONFIG_DEBUG_FEATURES=y
-
-#
-# Debug SYSLOG Output Controls
-#
-CONFIG_DEBUG_ERROR=y
-CONFIG_DEBUG_WARN=y
-CONFIG_DEBUG_INFO=y
-# CONFIG_DEBUG_ASSERTIONS is not set
-
-#
-# Subsystem Debug Options
-#
-# CONFIG_DEBUG_BINFMT is not set
-# CONFIG_DEBUG_FS is not set
-# CONFIG_DEBUG_GRAPHICS is not set
-# CONFIG_DEBUG_LIB is not set
-# CONFIG_DEBUG_MM is not set
-# CONFIG_DEBUG_NET is not set
-# CONFIG_DEBUG_SCHED is not set
-
-#
-# OS Function Debug Options
-#
-# CONFIG_DEBUG_IRQ is not set
-
-#
-# Driver Debug Options
-#
-# CONFIG_DEBUG_LEDS is not set
-# CONFIG_DEBUG_ANALOG is not set
-# CONFIG_DEBUG_GPIO is not set
+# CONFIG_DEBUG_FEATURES is not set
 CONFIG_ARCH_HAVE_STACKCHECK=y
 # CONFIG_STACK_COLORATION is not set
 CONFIG_ARCH_HAVE_HEAPCHECK=y
@@ -161,7 +130,6 @@ CONFIG_ARCH_HAVE_CMNVECTOR=y
 # CONFIG_ARCH_HAVE_TRUSTZONE is not set
 CONFIG_ARM_HAVE_MPU_UNIFIED=y
 # CONFIG_ARM_MPU is not set
-# CONFIG_DEBUG_HARDFAULT is not set
 
 #
 # ARMV7M Configuration Options
@@ -411,7 +379,7 @@ CONFIG_STM32_ETHMAC=y
 # CONFIG_STM32_I2C1 is not set
 # CONFIG_STM32_OTGFS is not set
 CONFIG_STM32_PWR=y
-# CONFIG_STM32_SPI1 is not set
+CONFIG_STM32_SPI1=y
 # CONFIG_STM32_SPI2 is not set
 # CONFIG_STM32_SPI3 is not set
 # CONFIG_STM32_TIM1 is not set
@@ -429,12 +397,14 @@ CONFIG_STM32_USART2=y
 # CONFIG_STM32_IWDG is not set
 # CONFIG_STM32_WWDG is not set
 CONFIG_STM32_ADC=y
+CONFIG_STM32_SPI=y
 # CONFIG_STM32_NOEXT_VECTORS is not set
 
 #
 # Alternate Pin Mapping
 #
 CONFIG_STM32_ETH_REMAP=y
+# CONFIG_STM32_SPI1_REMAP is not set
 CONFIG_STM32_USART2_REMAP=y
 # CONFIG_STM32_JTAG_DISABLE is not set
 CONFIG_STM32_JTAG_FULL_ENABLE=y
@@ -479,6 +449,12 @@ CONFIG_STM32_USART2_SERIALDRIVER=y
 # CONFIG_STM32_FLOWCONTROL_BROKEN is not set
 # CONFIG_STM32_USART_BREAKS is not set
 # CONFIG_STM32_USART_SINGLEWIRE is not set
+
+#
+# SPI Configuration
+#
+# CONFIG_STM32_SPI_INTERRUPTS is not set
+# CONFIG_STM32_SPI_DMA is not set
 CONFIG_STM32_HAVE_RTC_COUNTER=y
 # CONFIG_STM32_HAVE_RTC_SUBSECONDS is not set
 
@@ -613,7 +589,7 @@ CONFIG_ARCH_HAVE_TICKLESS=y
 # CONFIG_SCHED_TICKLESS is not set
 CONFIG_USEC_PER_TICK=10000
 # CONFIG_SYSTEM_TIME64 is not set
-# CONFIG_CLOCK_MONOTONIC is not set
+CONFIG_CLOCK_MONOTONIC=y
 # CONFIG_JULIAN_TIME is not set
 CONFIG_START_YEAR=1970
 CONFIG_START_MONTH=0
@@ -728,7 +704,16 @@ CONFIG_RAMDISK=y
 # CONFIG_PWM is not set
 CONFIG_ARCH_HAVE_I2CRESET=y
 # CONFIG_I2C is not set
-# CONFIG_SPI is not set
+CONFIG_SPI=y
+# CONFIG_SPI_SLAVE is not set
+CONFIG_SPI_EXCHANGE=y
+# CONFIG_SPI_CMDDATA is not set
+CONFIG_SPI_CALLBACK=y
+# CONFIG_SPI_BITBANG is not set
+CONFIG_SPI_HWFEATURES=y
+# CONFIG_SPI_CRCGENERATION is not set
+CONFIG_SPI_CS_CONTROL=y
+# CONFIG_SPI_CS_DELAY_CONTROL is not set
 # CONFIG_I2S is not set
 
 #
@@ -769,7 +754,17 @@ CONFIG_ADC_FIFOSIZE=8
 # CONFIG_RGBLED is not set
 # CONFIG_PCA9635PW is not set
 # CONFIG_NCP5623C is not set
-# CONFIG_MMCSD is not set
+CONFIG_MMCSD=y
+CONFIG_MMCSD_NSLOTS=1
+# CONFIG_MMCSD_READONLY is not set
+# CONFIG_MMCSD_MULTIBLOCK_DISABLE is not set
+# CONFIG_MMCSD_MMCSUPPORT is not set
+CONFIG_MMCSD_HAVECARDDETECT=y
+CONFIG_MMCSD_SPI=y
+CONFIG_MMCSD_SPICLOCK=20000000
+CONFIG_MMCSD_SPIMODE=0
+# CONFIG_ARCH_HAVE_SDIO is not set
+# CONFIG_ARCH_HAVE_SDIOWAIT_WRCOMPLETE is not set
 # CONFIG_MODEM is not set
 # CONFIG_MTD is not set
 # CONFIG_EEPROM is not set
@@ -783,7 +778,6 @@ CONFIG_NETDEVICES=y
 # CONFIG_NETDEV_MULTINIC is not set
 # CONFIG_ARCH_HAVE_NETDEV_STATISTICS is not set
 # CONFIG_NETDEV_LATEINIT is not set
-# CONFIG_NET_DUMPPACKET is not set
 
 #
 # External Ethernet MAC Device Support
@@ -814,7 +808,6 @@ CONFIG_ETH0_PHY_DP83848C=y
 # CONFIG_ETH0_PHY_LAN8740A is not set
 # CONFIG_ETH0_PHY_LAN8742A is not set
 # CONFIG_ETH0_PHY_DM9161 is not set
-# CONFIG_NETDEV_PHY_DEBUG is not set
 # CONFIG_PIPES is not set
 # CONFIG_PM is not set
 # CONFIG_POWER is not set
@@ -853,7 +846,6 @@ CONFIG_SERIAL_NPOLLWAITERS=2
 # CONFIG_SERIAL_IFLOWCONTROL is not set
 # CONFIG_SERIAL_OFLOWCONTROL is not set
 # CONFIG_SERIAL_DMA is not set
-# CONFIG_SERIAL_TIOCSERGSTRUCT is not set
 CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
 CONFIG_USART2_SERIAL_CONSOLE=y
 # CONFIG_OTHER_SERIAL_CONSOLE is not set
@@ -992,7 +984,6 @@ CONFIG_NET_IOB=y
 CONFIG_IOB_NBUFFERS=24
 CONFIG_IOB_BUFSIZE=196
 CONFIG_IOB_NCHAINS=8
-# CONFIG_IOB_DEBUG is not set
 # CONFIG_NET_ARCH_INCR32 is not set
 # CONFIG_NET_ARCH_CHKSUM is not set
 # CONFIG_NET_STATISTICS is not set
@@ -1023,7 +1014,14 @@ CONFIG_FS_WRITABLE=y
 # CONFIG_FS_NAMED_SEMAPHORES is not set
 CONFIG_FS_MQUEUE_MPATH="/var/mqueue"
 # CONFIG_FS_RAMMAP is not set
-# CONFIG_FS_FAT is not set
+CONFIG_FS_FAT=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FAT_MAXFNAME=32
+# CONFIG_FS_FATTIME is not set
+# CONFIG_FAT_FORCE_INDIRECT is not set
+# CONFIG_FAT_DMAMEMORY is not set
+# CONFIG_FAT_DIRECT_RETRY is not set
 # CONFIG_FS_NXFFS is not set
 # CONFIG_FS_ROMFS is not set
 # CONFIG_FS_TMPFS is not set
@@ -1168,7 +1166,11 @@ CONFIG_EXAMPLES_ADC_SWTRIG=y
 # CONFIG_EXAMPLES_MEDIA is not set
 # CONFIG_EXAMPLES_MM is not set
 # CONFIG_EXAMPLES_MODBUS is not set
-# CONFIG_EXAMPLES_MOUNT is not set
+CONFIG_EXAMPLES_MOUNT=y
+# CONFIG_EXAMPLES_MOUNT_BLOCKDEVICE is not set
+CONFIG_EXAMPLES_MOUNT_NSECTORS=2048
+CONFIG_EXAMPLES_MOUNT_SECTORSIZE=512
+CONFIG_EXAMPLES_MOUNT_RAMDEVNO=0
 # CONFIG_EXAMPLES_NETTEST is not set
 # CONFIG_EXAMPLES_NRF24L01TERM is not set
 CONFIG_EXAMPLES_NSH=y
@@ -1302,6 +1304,7 @@ CONFIG_NSH_BUILTIN_APPS=y
 # CONFIG_NSH_DISABLE_LS is not set
 # CONFIG_NSH_DISABLE_MB is not set
 # CONFIG_NSH_DISABLE_MKDIR is not set
+# CONFIG_NSH_DISABLE_MKFATFS is not set
 # CONFIG_NSH_DISABLE_MKRD is not set
 # CONFIG_NSH_DISABLE_MH is not set
 # CONFIG_NSH_DISABLE_MOUNT is not set
@@ -1325,6 +1328,8 @@ CONFIG_NSH_BUILTIN_APPS=y
 # CONFIG_NSH_DISABLE_WGET is not set
 # CONFIG_NSH_DISABLE_XD is not set
 CONFIG_NSH_MMCSDMINOR=0
+CONFIG_NSH_MMCSDSLOTNO=0
+CONFIG_NSH_MMCSDSPIPORTNO=0
 
 #
 # Configure Command Options
@@ -1348,7 +1353,7 @@ CONFIG_NSH_STRERROR=y
 #
 CONFIG_NSH_CONSOLE=y
 # CONFIG_NSH_ALTCONDEV is not set
-# CONFIG_NSH_ARCHINIT is not set
+CONFIG_NSH_ARCHINIT=y
 
 #
 # Networking Configuration
@@ -1357,7 +1362,6 @@ CONFIG_NSH_NETINIT=y
 CONFIG_NSH_NETINIT_THREAD=y
 CONFIG_NSH_NETINIT_THREAD_STACKSIZE=1568
 CONFIG_NSH_NETINIT_THREAD_PRIORITY=80
-# CONFIG_NSH_NETINIT_DEBUG is not set
 
 #
 # IP Address Configuration
@@ -1391,7 +1395,7 @@ CONFIG_NSH_MAX_ROUNDTRIP=20
 # CONFIG_SYSTEM_HEXED is not set
 # CONFIG_SYSTEM_INSTALL is not set
 # CONFIG_SYSTEM_NETDB is not set
-# CONFIG_SYSTEM_RAMTEST is not set
+CONFIG_SYSTEM_RAMTEST=y
 CONFIG_READLINE_HAVE_EXTMATCH=y
 CONFIG_SYSTEM_READLINE=y
 CONFIG_READLINE_ECHO=y

configs/stm32butterfly2/src/Makefile

@@ -42,4 +42,12 @@ ifeq ($(CONFIG_STM32_ADC),y)
 CSRCS += stm32_adc.c
 endif
 
+ifeq ($(CONFIG_STM32_SPI1),y)
+CSRCS += stm32_spi.c
+endif
+
+ifeq ($(CONFIG_MMCSD),y)
+CSRCS += stm32_mmcsd.c
+endif
+
 include $(TOPDIR)/configs/Board.mk

configs/stm32butterfly2/src/stm32_boot.c

@@ -39,6 +39,10 @@
 
 #include <nuttx/config.h>
 #include <arch/board/board.h>
+#include <syslog.h>
+
+#include "stm32_gpio.h"
+#include "stm32_butterfly2.h"
 
 /*******************************************************************************
  * Public Functions
@@ -47,9 +51,17 @@
 void stm32_boardinitialize(void)
 {
   stm32_led_initialize();
+  stm32_spidev_initialize();
 }
 
 int board_app_initialize(uintptr_t arg)
 {
-  return 0;
+  int rv;
+  if ((rv = stm32_sdinitialize(CONFIG_NSH_MMCSDMINOR)) < 0)
+    {
+      syslog(LOG_ERR, "Failed to initialize SD slot %d: %d\n");
+      return rv;
+    }
+
+    return 0;
 }

configs/stm32butterfly2/src/stm32_butterfly2.h

+/*****************************************************************************
+ * configs/stm32butterfly2/src/stm32_butterfly2.h
+ *
+ *   Copyright (C) 2016 Michał Łyszczek. All rights reserved.
+ *   Author: Michał Łyszczek <michal.lyszczek@gmail.com>
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/*****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include "stm32_gpio.h"
+
+/*****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define GPIO_SD_CS      (GPIO_OUTPUT | GPIO_CNF_OUTPP | GPIO_MODE_50MHz |\
+                         GPIO_OUTPUT_SET | GPIO_PORTA | GPIO_PIN4)
+#define GPIO_SD_CD      (GPIO_INPUT | GPIO_CNF_INFLOAT | GPIO_EXTI |\
+                         GPIO_PORTB | GPIO_PIN9)
+
+/*****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/*****************************************************************************
+ * Name: stm32_spidev_initialize
+ *
+ * Description:
+ *      Called to configure SPI chip select GPIO pins.
+ *
+ * Note:
+ *      Here only CS pins are configured as SPI pins are configured by driver
+ *      itself.
+ ****************************************************************************/
+
+void stm32_spidev_initialize(void);
+
+/*****************************************************************************
+ * Name: stm32_sdinitialize
+ *
+ * Description:
+ *      Initializes SPI-based SD card
+ *
+ ****************************************************************************/
+
+int stm32_sdinitialize(int minor);
+

configs/stm32butterfly2/src/stm32_mmcsd.c

+/*****************************************************************************
+ * configs/stm32butterfly2/src/stm32_mmcsd.c
+ *
+ *   Copyright (C) 2016 Michał Łyszczek. All rights reserved.
+ *   Author: Michał Łyszczek <michal.lyszczek@gmail.com>
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/*****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <debug.h>
+#include <fcntl.h>
+#include <nuttx/config.h>
+#include <nuttx/mmcsd.h>
+#include <nuttx/spi/spi.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "stm32.h"
+#include "stm32_butterfly2.h"
+#include "stm32_spi.h"
+
+/*****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef CONFIG_STM32_SPI1
+#  error "SD driver requires CONFIG_STM32_SPI1 to be enabled"
+#endif
+
+#ifdef CONFIG_DISABLE_MOUNTPOINT
+#  error "SD driver requires CONFIG_DISABLE_MOUNTPOINT to be disabled"
+#endif
+
+/*****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+static const int SD_SPI_PORT = 1; /* SD is connected to SPI1 port */
+static const int SD_SLOT_NO = 0;  /* There is only one SD slot */
+
+/* Media changed callback */
+
+static spi_mediachange_t mediachangeclbk;
+
+/* Argument for media changed callback */
+
+static void *mediachangearg;
+
+/* Semafor to inform stm32_cd_thread that card was inserted or pulled out */
+
+static sem_t cdsem;
+
+/*****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/*****************************************************************************
+ * Name: stm32_cd_thread
+ *
+ * Description:
+ *      Working thread to call mediachanged function when card is inserted or
+ *      pulled out.
+ ****************************************************************************/
+
+static void *stm32_cd_thread(void *arg)
+{
+  (void)arg;
+
+  while (1)
+    {
+      sem_wait(&cdsem);
+
+      if (mediachangeclbk)
+        {
+          /* Card doesn't seem to initialize properly without letting it to
+           * rest for a millsecond or so.
+           */
+
+          usleep(1 * 1000);
+          mediachangeclbk(mediachangearg);
+        }
+    }
+
+  return NULL;
+}
+
+/*****************************************************************************
+ * Name: stm32_cd
+ *
+ * Description:
+ *      Card detect interrupt handler.
+ ****************************************************************************/
+
+static int stm32_cd(int irq, FAR void *context)
+{
+  static const int debounce_time = 100; /* [ms] */
+  static uint32_t now = 0;
+  static uint32_t prev = 0;
+
+  struct timespec tp;
+  clock_gettime(CLOCK_MONOTONIC, &tp);
+  now = tp.tv_sec * 1000 + tp.tv_nsec / 1000000;
+
+  /* When inserting card, card detect plate might bounce causing this
+   * interrupt to be called many time on single card insert/deinsert. Thus we
+   * are allowing only one interrupt every 100ms.
+   */
+
+  if (now - debounce_time > prev)
+    {
+      prev = now;
+      sem_post(&cdsem);
+    }
+
+  return OK;
+}
+
+/*****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/*****************************************************************************
+ * Name: stm32_spi1register
+ *
+ * Description:
+ *      Registers media change callback
+ ****************************************************************************/
+
+int stm32_spi1register(FAR struct spi_dev_s *dev, spi_mediachange_t callback,
+                       FAR void *arg)
+{
+  mediachangeclbk = callback;
+  mediachangearg = arg;
+  return OK;
+}
+
+/*****************************************************************************
+ * Name: stm32_sdinitialize
+ *
+ * Description:
+ *      Initialize SPI-based SD card and card detect thread.
+ ****************************************************************************/
+
+int stm32_sdinitialize(int minor)
+{
+  FAR struct spi_dev_s *spi;
+  int rv;
+
+  spi = stm32_spibus_initialize(SD_SPI_PORT);
+  if (!spi)
+    {
+      ferr("failed to initialize SPI port %d\n", SD_SPI_PORT);
+      return -ENODEV;
+    }
+
+  if ((rv = mmcsd_spislotinitialize(minor, SD_SLOT_NO, spi)) < 0)
+    {
+      ferr("failed to bind SPI port %d to SD slot %d\n", SD_SPI_PORT,
+           SD_SLOT_NO);
+      return rv;
+    }
+
+  stm32_gpiosetevent(GPIO_SD_CD, true, true, true, stm32_cd);
+  sem_init(&cdsem, 0, 0);
+
+  pthread_attr_t pattr;
+  pthread_attr_init(&pattr);
+#ifdef CONFIG_DEBUG_FS
+  pthread_attr_setstacksize(&pattr, 1024);
+#else
+  pthread_attr_setstacksize(&pattr, 256);
+#endif
+  pthread_create(NULL, &pattr, stm32_cd_thread, NULL);
+
+  return OK;
+}
+

configs/stm32butterfly2/src/stm32_spi.c

+/*****************************************************************************
+ * configs/stm32butterfly2/src/stm32_spi.c
+ *
+ *   Copyright (C) 2016 Michał Łyszczek. All rights reserved.
+ *   Author: Michał Łyszczek <michal.lyszczek@gmail.com>
+ *
+ * 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.
+ ****************************************************************************/
+
+/*****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <debug.h>
+#include <nuttx/config.h>
+#include <nuttx/spi/spi.h>
+
+#include "stm32_butterfly2.h"
+#include "stm32_gpio.h"
+#include "stm32_spi.h"
+
+/*****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/*****************************************************************************
+ * Name: stm32_spidev_initialize
+ *
+ * Description:
+ *      Called to configure SPI chip select GPIO pins.
+ *
+ * Note:
+ *      Here only CS pins are configured as SPI pins are configured by driver
+ *      itself.
+ ****************************************************************************/
+
+void stm32_spidev_initialize(void)
+{
+  stm32_configgpio(GPIO_SD_CS);
+  stm32_configgpio(GPIO_SD_CD);
+}
+
+/*****************************************************************************
+ * Name: stm32_spi1select
+ *
+ * Description:
+ *      Function asserts given devid based on select
+ ****************************************************************************/
+
+void stm32_spi1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid,
+                     bool select)
+{
+  if (devid == SPIDEV_MMCSD)
+    {
+      stm32_gpiowrite(GPIO_SD_CS, !select);
+    }
+}
+
+/*****************************************************************************
+ * Name: stm32_spi1status
+ *
+ * Description:
+ *      Return status of devid
+ ****************************************************************************/
+
+uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+  if (devid == SPIDEV_MMCSD)
+    {
+      if (stm32_gpioread(GPIO_SD_CD) == 0)
+        {
+          return SPI_STATUS_PRESENT;
+        }
+    }
+
+    return 0;
+}