arch/xtensa/src/esp32/esp32_spi.h

/****************************************************************************
 * arch/xtensa/src/esp32/esp32_spi.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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#ifndef __ARCH_XTENSA_SRC_ESP32_ESP32_SPI_H
#define __ARCH_XTENSA_SRC_ESP32_ESP32_SPI_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#ifndef __ASSEMBLY__

#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

#ifdef CONFIG_ESP32_SPI

#include <nuttx/spi/spi.h>

#ifdef CONFIG_ESP32_SPI2
#  define ESP32_SPI2 2
#endif

#ifdef CONFIG_ESP32_SPI3
#  define ESP32_SPI3 3
#endif

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#define ESP32_SPI_IO_R      (1 << 0)
#define ESP32_SPI_IO_W      (1 << 1)
#define ESP32_SPI_IO_RW     (ESP32_SPI_IO_R | ESP32_SPI_IO_W)

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: esp32_spibus_initialize
 *
 * Description:
 *   Initialize the selected SPI bus
 *
 * Input Parameters:
 *   Port number (for hardware that has multiple SPI interfaces)
 *
 * Returned Value:
 *   Valid SPI device structure reference on success; a NULL on failure
 *
 ****************************************************************************/

struct spi_dev_s *esp32_spibus_initialize(int port);

/****************************************************************************
 * Name:  esp32_spi0/1/...select and esp32_spi0/1/...status
 *
 * Description:
 *   The external functions, esp32_spi0/1/...select, esp32_spi0/1/...status,
 *   and esp32_spi0/1/...cmddata must be provided by board-specific logic.
 *   These are implementations of the select, status, and cmddata methods of
 *   the SPI interface defined by struct spi_ops_s (include/nuttx/spi/spi.h).
 *   All other methods (including esp32_spibus_initialize()) are provided by
 *   common ESP32 logic. To use this common SPI logic on your board:
 *
 *   1. Provide logic in esp32_boardinitialize() to configure SPI chip select
 *      pins.
 *   2. Provide esp32_spi0/1/...select() and esp32_spi0/1/...status()
 *      functions in your board-specific logic. These functions will perform
 *      chip selection and status operations using GPIOs in the way your
 *      board is configured.
 *   3. If CONFIG_SPI_CMDDATA is defined in your NuttX configuration file,
*      then provide esp32_spi0/1/...cmddata() functions in your
 *      board-specific logic. These functions will perform cmd/data selection
 *      operations using GPIOs in the way your board is configured.
 *   4. Add a calls to esp32_spibus_initialize() in your low level
 *      application initialization logic.
 *   5. The handle returned by esp32_spibus_initialize() may then be used to
 *      bind the SPI driver to higher level logic (e.g., calling
 *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
 *      the SPI MMC/SD driver).
 *
 ****************************************************************************/

#ifdef CONFIG_ESP32_SPI2
void esp32_spi2_select(struct spi_dev_s *dev, uint32_t devid,
                       bool selected);
uint8_t esp32_spi2_status(struct spi_dev_s *dev, uint32_t devid);
int esp32_spi2_cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd);
#endif

#ifdef CONFIG_ESP32_SPI3
void esp32_spi3_select(struct spi_dev_s *dev, uint32_t devid,
                       bool selected);
uint8_t esp32_spi3_status(struct spi_dev_s *dev, uint32_t devid);
int esp32_spi3_cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd);
#endif

/****************************************************************************
 * Name: esp32_spibus_uninitialize
 *
 * Description:
 *   Uninitialize an SPI bus
 *
 ****************************************************************************/

int esp32_spibus_uninitialize(struct spi_dev_s *dev);

/****************************************************************************
 * Name: esp32_spislv_ctrlr_initialize
 *
 * Description:
 *   Initialize the selected SPI slave bus
 *
 * Input Parameters:
 *   Port number (for hardware that has multiple SPI slave interfaces)
 *
 * Returned Value:
 *   Valid SPI slave device structure reference on success; a NULL on failure
 *
 ****************************************************************************/

struct spi_slave_ctrlr_s *esp32_spislv_ctrlr_initialize(int port);

/****************************************************************************
 * Name: esp32_spislv_ctrlr_uninitialize
 *
 * Description:
 *   Uninitialize an SPI slave bus
 *
 * Input Parameters:
 *   ctrlr - SPI slave controller interface instance
 *
 * Returned Value:
 *   OK if success or fail
 *
 ****************************************************************************/

int esp32_spislv_ctrlr_uninitialize(struct spi_slave_ctrlr_s *ctrlr);

#endif /* CONFIG_ESP32_SPI */

#ifdef __cplusplus
}
#endif
#undef EXTERN

#endif /* __ASSEMBLY__ */
#endif /* __ARCH_XTENSA_SRC_ESP32_ESP32_SPI_H */