esp32s2-saola-1: Add SPI example using max6675

boards/xtensa/esp32s2/common/include/esp32s2_max6675.h

@@ -0,0 +1,36 @@
+/****************************************************************************
+ * boards/xtensa/esp32s2/common/include/esp32s2_max6675.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_max6675_initialize
+ *
+ * Description:
+ *   Initialize and register the MAX6675 Temperature Sensor driver.
+ *
+ * Input Parameters:
+ *   devno - The device number, used to build the device path as /dev/tempN
+ *   busno - The SPI bus number
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_max6675_initialize(int devno, int busno);

boards/xtensa/esp32s2/common/src/Make.defs

@@ -24,6 +24,10 @@ ifeq ($(CONFIG_WATCHDOG),y)
   CSRCS += esp32s2_board_wdt.c
 endif
 
+ifeq ($(CONFIG_SENSORS_MAX6675),y)
+  CSRCS += esp32s2_max6675.c
+endif
+
 DEPPATH += --dep-path src
 VPATH += :src
 CFLAGS += $(shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)src)

boards/xtensa/esp32s2/common/src/esp32s2_max6675.c

@@ -0,0 +1,103 @@
+/****************************************************************************
+ * boards/xtensa/esp32s2/common/src/esp32s2_max6675.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/arch.h>
+#include <nuttx/sensors/max6675.h>
+#include <nuttx/spi/spi.h>
+#include <stdio.h>
+#include <debug.h>
+#include "esp32s2_spi.h"
+
+#ifdef CONFIG_SENSORS_MAX6675
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_max6675_initialize
+ *
+ * Description:
+ *   Initialize and register the MAX6675 Temperature Sensor driver.
+ *
+ * Input Parameters:
+ *   devno - The device number, used to build the device path as /dev/tempN
+ *   busno - The SPI bus number
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_max6675_initialize(int devno, int busno)
+{
+  struct spi_dev_s *spi;
+  char devpath[12];
+  int ret;
+
+  spi = esp32s2_spibus_initialize(busno);
+
+  if (!spi)
+    {
+      return -ENODEV;
+    }
+
+  /* Then register the barometer sensor */
+
+  snprintf(devpath, sizeof(devpath), "/dev/temp%d", devno);
+  ret = max6675_register(devpath, spi);
+  if (ret < 0)
+    {
+      snerr("ERROR: Error registering MAX6675\n");
+    }
+
+  return ret;
+}
+
+#endif

boards/xtensa/esp32s2/esp32s2-saola-1/src/Make.defs

@@ -49,6 +49,10 @@ ifeq ($(CONFIG_SENSORS_BMP180),y)
 CSRCS += esp32s2_bmp180.c
 endif
 
+ifeq ($(CONFIG_ESP32S2_SPI),y)
+CSRCS += esp32s2_board_spi.c
+endif
+
 SCRIPTIN = $(SCRIPTDIR)$(DELIM)esp32s2.template.ld
 SCRIPTOUT = $(SCRIPTDIR)$(DELIM)esp32s2_out.ld
 

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_spi.c

@@ -0,0 +1,126 @@
+/****************************************************************************
+ * boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_spi.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <nuttx/spi/spi.h>
+
+#include "esp32s2_gpio.h"
+#include "esp32s2-saola-1.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp32s2_spi2_status
+ ****************************************************************************/
+
+#ifdef CONFIG_ESP32S2_SPI2
+
+uint8_t esp32s2_spi2_status(struct spi_dev_s *dev, uint32_t devid)
+{
+  uint8_t status = 0;
+
+  return status;
+}
+
+#endif
+
+/****************************************************************************
+ * Name: esp32s2_spi2_cmddata
+ ****************************************************************************/
+
+#if defined(CONFIG_ESP32S2_SPI2) && defined(CONFIG_SPI_CMDDATA)
+
+int esp32s2_spi2_cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
+{
+  if (devid == SPIDEV_DISPLAY(0))
+    {
+      /*  This is the Data/Command control pad which determines whether the
+       *  data bits are data or a command.
+       */
+
+      esp32s2_gpiowrite(GPIO_LCD_DC, !cmd);
+
+      return OK;
+    }
+
+  spiinfo("devid: %" PRIu32 " CMD: %s\n", devid, cmd ? "command" :
+          "data");
+
+  return -ENODEV;
+}
+
+#endif
+
+/****************************************************************************
+ * Name: esp32s2_spi3_status
+ ****************************************************************************/
+
+#ifdef CONFIG_ESP32S2_SPI3
+
+uint8_t esp32s2_spi3_status(struct spi_dev_s *dev, uint32_t devid)
+{
+  uint8_t status = 0;
+
+  return status;
+}
+
+#endif
+
+/****************************************************************************
+ * Name: esp32s2_spi3_cmddata
+ ****************************************************************************/
+
+#if defined(CONFIG_ESP32S2_SPI3) && defined(CONFIG_SPI_CMDDATA)
+
+int esp32s2_spi3_cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
+{
+  if (devid == SPIDEV_DISPLAY(0))
+    {
+      /*  This is the Data/Command control pad which determines whether the
+       *  data bits are data or a command.
+       */
+
+      esp32s2_gpiowrite(CONFIG_ESP32S2_SPI3_MISOPIN, !cmd);
+
+      return OK;
+    }
+
+  spiinfo("devid: %" PRIu32 " CMD: %s\n", devid, cmd ? "command" :
+          "data");
+
+  return -ENODEV;
+}
+
+#endif

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_bringup.c

@@ -62,6 +62,10 @@
 #  include "esp32s2_board_wdt.h"
 #endif
 
+#ifdef CONFIG_SENSORS_MAX6675
+#  include "esp32s2_max6675.h"
+#endif
+
 #include "esp32s2-saola-1.h"
 
 /****************************************************************************
@@ -217,6 +221,14 @@ int esp32s2_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_SENSORS_MAX6675
+  ret = board_max6675_initialize(0, 2);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: MAX6675 initialization failed: %d\n", ret);
+    }
+#endif
+
   /* If we got here then perhaps not all initialization was successful, but
    * at least enough succeeded to bring-up NSH with perhaps reduced
    * capabilities.