* boards/arm/samv7/same70-qmtech/src/sam_spi.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 <assert.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/spi/spi.h>
#include <arch/board/board.h>
#include "arm_internal.h"
#include "chip.h"
#include "sam_gpio.h"
#include "sam_spi.h"
#include "same70-qmtech.h"
#ifdef CONFIG_SAMV7_SPI
* Public Functions
****************************************************************************/
* Name: sam_spidev_initialize
*
* Description:
* Called to configure SPI chip select PIO pins for the SAME70-QMTECH
* board.
*
****************************************************************************/
void sam_spidev_initialize(void)
{
#ifdef CONFIG_SAMV7_SPI0_MASTER
#endif
#ifdef CONFIG_SAMV7_SPI0_SLAVE
#endif
#ifdef CONFIG_SAMV7_SPI1_MASTER
#endif
#ifdef CONFIG_SAMV7_SPI1_SLAVE
#endif
}
* 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
* your 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:
* devid - Identifies the (logical) device
* selected - TRUE:Select the device, FALSE:De-select the device
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_SAMV7_SPI0_MASTER
void sam_spi0select(uint32_t devid, bool selected)
{
spiinfo("devid: %d CS: %s\n", (int)devid,
selected ? "assert" : "de-assert");
}
#endif
#ifdef CONFIG_SAMV7_SPI1_MASTER
void sam_spi1select(uint32_t devid, bool selected)
{
spiinfo("devid: %d CS: %s\n", (int)devid,
selected ? "assert" : "de-assert");
}
#endif
* Name: sam_spi[0|1]status
*
* Description:
* Return status information associated with the SPI device.
*
* Input Parameters:
* devid - Identifies the (logical) device
*
* Returned Value:
* Bit-encoded SPI status (see include/nuttx/spi/spi.h.
*
****************************************************************************/
#ifdef CONFIG_SAMV7_SPI0_MASTER
uint8_t sam_spi0status(struct spi_dev_s *dev, uint32_t devid)
{
return 0;
}
#endif
#ifdef CONFIG_SAMV7_SPI1_MASTER
uint8_t sam_spi1status(struct spi_dev_s *dev, uint32_t devid)
{
return 0;
}
#endif
#endif