* arch/arm/src/sam34/sam_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.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_SAM34_SAM_SPI_H
#define __ARCH_ARM_SRC_SAM34_SAM_SPI_H
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include "chip.h"
#include "hardware/sam_spi.h"
* Pre-processor Definitions
****************************************************************************/
* information about the SPI controller (0 or 1) and the SPI chip select
* (0-3).
*
* NOTE that this is this is backward compatible with older implementations
* that support only SPI0 and provide only the chip select number to
* sam_spibus_initialize().
*/
#define __SPI_CS_SHIFT (0)
#define __SPI_CS_MASK (3 << __SPI_CS_SHIFT)
# define __SPI_CS0 (0 << __SPI_CS_SHIFT)
# define __SPI_CS1 (1 << __SPI_CS_SHIFT)
# define __SPI_CS2 (2 << __SPI_CS_SHIFT)
# define __SPI_CS3 (3 << __SPI_CS_SHIFT)
#define __SPI_SPI_SHIFT (2)
#define __SPI_SPI_MASK (1 << __SPI_SPI_SHIFT)
# define __SPI_SPI0 (0 << __SPI_SPI_SHIFT)
# define __SPI_SPI1 (1 << __SPI_SPI_SHIFT)
#define SPI0_CS0 (__SPI_SPI0 | __SPI_CS0)
#define SPI0_CS1 (__SPI_SPI0 | __SPI_CS1)
#define SPI0_CS2 (__SPI_SPI0 | __SPI_CS2)
#define SPI0_CS3 (__SPI_SPI0 | __SPI_CS3)
#define SPI1_CS0 (__SPI_SPI1 | __SPI_CS0)
#define SPI1_CS1 (__SPI_SPI1 | __SPI_CS1)
#define SPI1_CS2 (__SPI_SPI1 | __SPI_CS2)
#define SPI1_CS3 (__SPI_SPI1 | __SPI_CS3)
* Public Types
****************************************************************************/
* Inline Functions
****************************************************************************/
#ifndef __ASSEMBLY__
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
* Public Function Prototypes
****************************************************************************/
struct spi_dev_s;
* Name: sam_spibus_initialize
*
* Description:
* Initialize the selected SPI port
*
* Input Parameters:
* cs - Chip select number (identifying the "logical" SPI port)
*
* Returned Value:
* Valid SPI device structure reference on success; a NULL on failure
*
****************************************************************************/
struct spi_dev_s *sam_spibus_initialize(int port);
* Name: sam_spi[0|1]select, sam_spi[0|1]status, and sam_spi[0|1]cmddata
*
* Description:
* These external functions must be provided by board-specific logic.
* They include:
*
* o sam_spi[0|1]select is a functions tomanage the board-specific chip
* selects
* o sam_spi[0|1]status and sam_spi[0|1]cmddata: Implementations of the
* status and cmddata methods of the SPI interface defined by struct
* spi_ops_ (see include/nuttx/spi/spi.h). All other methods including
* sam_spibus_initialize()) are provided by common SAM3/4 logic.
*
* To use this common SPI logic on your board:
*
* 1. Provide logic in sam_boardinitialize() to configure SPI chip select
* pins.
* 2. Provide sam_spi[0|1]select() and sam_spi[0|1]status() functions in
* our board-specific logic. These functions will perform chip selection
* and status operations using PIOs in the way your board is configured.
* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
* sam_spi[0|1]cmddata() functions in your board-specific logic. This
* function will perform cmd/data selection operations using PIOs in
* the way your board is configured.
* 3. Add a call to sam_spibus_initialize() in your low level application
* initialization logic
* 4. The handle returned by sam_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).
*
****************************************************************************/
* Name: sam_spi[0|1]select
*
* Description:
* PIO chip select pins may be programmed by the board specific logic in
* one of two different ways. First, the pins may be programmed as SPI
* peripherals. In that case, the pins are completely controlled by the
* SPI driver. This method still needs to be provided, but it may be only
* a stub.
*
* An alternative way to program the PIO chip select pins is as a normal
* PIO output. In that case, the automatic control of the CS pins is
* bypassed and this function must provide control of the chip select.
* NOTE: In this case, the PIO output pin does *not* have to be the
* same as the NPCS pin normal associated with the chip select number.
*
* Input Parameters:
* dev - SPI device info
* devid - Identifies the (logical) device
* selected - TRUE:Select the device, FALSE:De-select the device
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_SAM34_SPI0
void sam_spi0select(uint32_t devid, bool selected);
#endif
#ifdef CONFIG_SAM34_SPI1
void sam_spi1select(uint32_t devid, bool selected);
#endif
* Name: sam_spi[0|1]status
*
* Description:
* Return status information associated with the SPI device.
*
* Input Parameters:
* dev - SPI device info
* devid - Identifies the (logical) device
*
* Returned Value:
* Bit-encoded SPI status (see include/nuttx/spi/spi.h.
*
****************************************************************************/
#ifdef CONFIG_SAM34_SPI0
uint8_t sam_spi0status(struct spi_dev_s *dev, uint32_t devid);
#endif
#ifdef CONFIG_SAM34_SPI1
uint8_t sam_spi1status(struct spi_dev_s *dev, uint32_t devid);
#endif
* Name: sam_spi[0|1]cmddata
*
* Description:
* Some SPI devices require an additional control to determine if the SPI
* data being sent is a command or is data. If CONFIG_SPI_CMDDATA then
* this function will be called to different be command and data transfers.
*
* This is often needed, for example, by LCD drivers. Some LCD hardware
* may be configured to use 9-bit data transfers with the 9th bit
* indicating command or data. That same hardware may be configurable,
* instead, to use 8-bit data but to require an additional, board-
* specific PIO control to distinguish command and data. This function
* would be needed in that latter case.
*
* Input Parameters:
* dev - SPI device info
* devid - Identifies the (logical) device
*
* Returned Value:
* Zero on success; a negated errno on failure.
*
****************************************************************************/
#ifdef CONFIG_SPI_CMDDATA
#ifdef CONFIG_SAM34_SPI0
int sam_spi0cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd);
#endif
#ifdef CONFIG_SAM34_SPI1
int sam_spi1cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd);
#endif
#endif
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif
#endif