configs/nucleo-l432kc: Added support for AT45DB Serial Flash

arch/x86/include/i486/irq.h

@@ -108,7 +108,7 @@
 
 #define NR_IRQS 48
 
-/* Common register save structgure created by up_saveusercontext() and by
+/* Common register save structure created by up_saveusercontext() and by
  * ISR/IRQ interrupt processing.
  */
 

configs/nucleo-l432kc/README.txt

@@ -52,6 +52,7 @@ Contents
     - USARTs and Serial Consoles
   - QFN32
   - mbed
+  - SPI Flash support
   - Configurations
 
 Nucleo-32 Boards
@@ -441,6 +442,61 @@ Serial Consoles
   As shipped, SB62 and SB63 are open and SB13 and SB14 closed, so the
   virtual COM port is enabled.
 
+SPI Flash support:
+=====================
+
+  We can use an external SPI Serial Flash with nucleo-l432kc board. In this
+  case we tested with AT45DB081D (8Mbit = 1MiB).
+
+  You can connect the AT45DB081D memory in the nucleo-l432kc board this way:
+
+  --------------------------------
+  | Memory        nucleo-l432kc  |
+  |------------------------------|
+  | SI      --->  D11 (PB5)      |
+  | SCK     --->  D13 (PB3)      |
+  | /RESET  --->  3V3            |
+  | /CS     --->  D10 (PA11)     |
+  | /WP     --->  3V3            |
+  | VCC     --->  3V3            |
+  | GND     --->  GND            |
+  | SO      --->  D12 (PB4)      |
+  --------------------------------
+
+  You can start with default "nucleo-l432kc/nsh" configuration option and
+  enable/disable these options using "make menuconfig" :
+
+  System Type  --->
+      STM32L4 Peripheral Support  --->
+          [*] SPI1
+
+  Device Drivers  --->
+      -*- Memory Technology Device (MTD) Support  --->
+              -*-   SPI-based AT45DB flash
+              (1000000) AT45DB Frequency
+
+  File Systems  --->
+      [*] NXFFS file system
+
+
+  Then after compiling and flashing the file nuttx.bin you can test the flash
+  this way:
+
+  nsh> ls /mnt
+  /mnt:
+   at45db/
+
+  nsh> echo "Testing" > /mnt/at45db/file.txt
+
+  nsh> ls /mnt/at45db
+  /mnt/at45db:
+   file.txt
+
+  nsh> cat /mnt/at45db/file.txt
+  Testing
+
+  nsh>
+
 Configurations
 ==============
 

configs/nucleo-l432kc/src/Makefile

@@ -56,6 +56,10 @@ ifeq ($(CONFIG_DAC7571),y)
 CSRCS += stm32_dac7571.c
 endif
 
+ifeq ($(CONFIG_MTD_AT45DB),y)
+CSRCS += stm32_at45db.c
+endif
+
 ifeq ($(CONFIG_SENSORS_QENCODER),y)
 CSRCS += stm32_qencoder.c
 endif

configs/nucleo-l432kc/src/nucleo-l432kc.h

@@ -54,6 +54,7 @@
 
 #define HAVE_PROC             1
 #define HAVE_RTC_DRIVER       1
+#define HAVE_AT45DB           1
 
 #if !defined(CONFIG_FS_PROCFS)
 #  undef HAVE_PROC
@@ -70,6 +71,12 @@
 #  undef HAVE_RTC_DRIVER
 #endif
 
+/* Check if we can support AT45DB FLASH file system */
+
+#if !defined(CONFIG_STM32L4_SPI1) || !defined(CONFIG_MTD_AT45DB)
+#  undef HAVE_AT45DB
+#endif
+
 /* LED.  User LD3: the green LED is a user LED connected to Arduino signal D13
  * corresponding to MCU I/O PB3 (pin 26)
  * target.
@@ -83,6 +90,14 @@
    GPIO_SPEED_50MHz)
 #define LED_DRIVER_PATH "/dev/userleds"
 
+/* SPI chip selects */
+
+#ifdef CONFIG_MTD_AT45DB
+#  define AT45DB_SPI1_CS \
+     (GPIO_PORTA | GPIO_PIN11 | GPIO_OUTPUT_SET | GPIO_OUTPUT | GPIO_PUSHPULL | \
+      GPIO_SPEED_50MHz)
+#endif
+
 /************************************************************************************
  * Public Data
  ************************************************************************************/
@@ -156,6 +171,18 @@ int stm32l4_adc_setup(void);
 int stm32_dac7571initialize(FAR const char *devpath);
 #endif
 
+/************************************************************************************
+ * Name: stm32_at45dbinitialize
+ *
+ * Description:
+ *   Initialize and register the AT45DB driver.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_MTD_AT45DB
+int stm32_at45dbinitialize(int minor);
+#endif
+
 /****************************************************************************
  * Name: board_timer_driver_initialize
  *

configs/nucleo-l432kc/src/stm32_appinit.c

@@ -170,6 +170,18 @@ int board_app_initialize(uintptr_t arg)
     }
 #endif
 
+#ifdef HAVE_AT45DB
+  /* Initialize and register the ATDB FLASH file system. */
+
+  ret = stm32_at45dbinitialize(0);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to initialize AT45DB minor %d: %d\n",
+             0, ret);
+      return ret;
+    }
+#endif
+
 #ifdef CONFIG_PWM
   /* Initialize PWM and register the PWM device. */
 

configs/nucleo-l432kc/src/stm32_spi.c

@@ -82,20 +82,39 @@ struct spi_dev_s *g_spi2;
 void stm32l4_spiinitialize(void)
 {
 #ifdef CONFIG_STM32L4_SPI1
+  /* Configure SPI1-based devices */
 
   g_spi1 = stm32l4_spibus_initialize(1);
-
+  if (!g_spi1)
-  spiinfo("SPI1 initialized\n");
+    {
-#endif
+      spierr("ERROR: FAILED to initialize SPI port 1\n");
-
+    }
-#ifdef CONFIG_STM32L4_SPI2
+  else
-  /* Configure SPI-based devices */
+    {
-
+      spiinfo("INFO: SPI port 1 initialized\n");
-  g_spi2 = stm32l4_spibus_initialize(2);
+    }
 
   /* Setup CS, EN & IRQ line IOs */
 
-  spiinfo("SPI2 initialized\n");
+#ifdef CONFIG_MTD_AT45DB
+  (void)stm32l4_configgpio(AT45DB_SPI1_CS);      /* FLASH chip select */
+#endif
+#endif
+
+#ifdef CONFIG_STM32L4_SPI2
+  /* Configure SPI2-based devices */
+
+  g_spi2 = stm32l4_spibus_initialize(2);
+  if (!g_spi2)
+    {
+      spierr("ERROR: FAILED to initialize SPI port 2\n");
+    }
+  else
+    {
+      spiinfo("INFO: SPI port 2 initialized\n");
+    }
+
+  /* Setup CS, EN & IRQ line IOs */
 #endif
 }
 
@@ -129,6 +148,12 @@ void stm32l4_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected
 {
   spiinfo("devid: %08X CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
 
+#ifdef CONFIG_MTD_AT45DB
+  if (devid == SPIDEV_FLASH(0))
+    {
+      stm32l4_gpiowrite(AT45DB_SPI1_CS, !selected);
+    }
+#endif
 }
 
 uint8_t stm32l4_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)