199 lines
6.5 KiB
C
199 lines
6.5 KiB
C
/****************************************************************************
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* boards/arm/kl/freedom-kl26z/src/kl_spi.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/spi/spi.h>
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#include "kl_gpio.h"
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#include "kl_spi.h"
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#include "freedom-kl26z.h"
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#if defined(CONFIG_KL_SPI0) || defined(CONFIG_KL_SPI1)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: kl_spidev_initialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the FRDM-KL26Z
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* board.
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*
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****************************************************************************/
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void weak_function kl_spidev_initialize(void)
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{
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/* Configure SPI0 chip selects */
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#ifdef CONFIG_KL_SPI0
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#endif
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/* Configure SPI1 chip selects */
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#ifdef CONFIG_KL_SPI1
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#endif
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}
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/****************************************************************************
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* Name: kl_spi[n]select, kl_spi[n]status, and kl_spi[n]cmddata
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*
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* Description:
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* These external functions must be provided by board-specific logic. They
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* are implementations of the select, status, and cmddata methods of the
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* SPI interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
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* All other methods including kl_spibus_initialize()) are provided by
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* common Kinetis logic. To use this common SPI logic on your board:
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*
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* 1. Provide logic in kl_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide kl_spi[n]select() and kl_spi[n]status() functions
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* in your board-specific logic. These functions will perform chip
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* selection and status operations using GPIOs in the way your board
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* is configured.
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* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
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* kl_spi[n]cmddata() functions in your board-specific logic. These
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* functions will perform cmd/data selection operations using GPIOs in
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* the way your board is configured.
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* 3. Add a call to kl_spibus_initialize() in your low level application
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* initialization logic
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* 4. The handle returned by kl_spibus_initialize() may then be used to
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* bind the SPI driver to higher level logic (e.g., calling
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* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
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* the SPI MMC/SD driver).
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*
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****************************************************************************/
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/****************************************************************************
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* Name: kl_spi[n]select
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*
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* Description:
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* PIO chip select pins may be programmed by the board specific logic in
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* one of two different ways. First, the pins may be programmed as SPI
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* peripherals. In that case, the pins are completely controlled by the
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* SPI driver. This method still needs to be provided, but it may be only
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* a stub.
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*
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* An alternative way to program the PIO chip select pins is as a normal
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* GPIO output. In that case, the automatic control of the CS pins is
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* bypassed and this function must provide control of the chip select.
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* NOTE: In this case, the GPIO output pin does *not* have to be the
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* same as the NPCS pin normal associated with the chip select number.
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*
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* Input Parameters:
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* devid - Identifies the (logical) device
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* selected - TRUE:Select the device, FALSE:De-select the device
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_KL_SPI0
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void kl_spi0select(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n",
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(int)devid, selected ? "assert" : "de-assert");
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}
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#endif
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#ifdef CONFIG_KL_SPI1
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void kl_spi1select(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n",
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(int)devid, selected ? "assert" : "de-assert");
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}
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#endif
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/****************************************************************************
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* Name: kl_spi[n]status
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*
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* Description:
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* Return status information associated with the SPI device.
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*
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* Input Parameters:
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* devid - Identifies the (logical) device
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*
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* Returned Value:
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* Bit-encoded SPI status (see include/nuttx/spi/spi.h.
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*
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****************************************************************************/
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#ifdef CONFIG_KL_SPI0
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uint8_t kl_spi0status(struct spi_dev_s *dev, uint32_t devid)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_KL_SPI1
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uint8_t kl_spi1status(struct spi_dev_s *dev, uint32_t devid)
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{
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return 0;
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}
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#endif
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/****************************************************************************
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* Name: kl_spi[n]cmddata
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*
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* Description:
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* Some SPI interfaces, particularly with LCDs, and an auxiliary 9th data
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* input that determines where the other 8 data bits represent command or
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* data. These interfaces control that CMD/DATA GPIO output
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*
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* Input Parameters:
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* devid - Identifies the (logical) device
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* cmd - Determines where command or data should be selected.
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*
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* Returned Value:
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* Bit-encoded SPI status (see include/nuttx/spi/spi.h.
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*
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****************************************************************************/
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#ifdef CONFIG_SPI_CMDDATA
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#ifdef CONFIG_KL_SPI0
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int kl_spi0cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_KL_SPI1
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int kl_spi1cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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return 0;
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}
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#endif
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#endif
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#endif /* CONFIG_KL_SPI */
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