9bb950da29
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5322 42af7a65-404d-4744-a932-0658087f49c3
242 lines
8.1 KiB
C
242 lines
8.1 KiB
C
/************************************************************************************
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* configs/stm32f4discovery/src/up_spi.c
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* arch/arm/src/board/up_spi.c
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*
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* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <stdint.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/spi.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "chip.h"
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#include "stm32_internal.h"
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#include "stm32f4discovery-internal.h"
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#if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2) || defined(CONFIG_STM32_SPI3)
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* Enables debug output from this file (needs CONFIG_DEBUG too) */
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#undef SPI_DEBUG /* Define to enable debug */
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#undef SPI_VERBOSE /* Define to enable verbose debug */
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#ifdef SPI_DEBUG
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# define spidbg lldbg
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# ifdef SPI_VERBOSE
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# define spivdbg lldbg
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# else
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# define spivdbg(x...)
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# endif
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#else
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# undef SPI_VERBOSE
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# define spidbg(x...)
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# define spivdbg(x...)
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#endif
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: stm32_spiinitialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the stm32f4discovery board.
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*
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************************************************************************************/
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void weak_function stm32_spiinitialize(void)
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{
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#ifdef CONFIG_STM32_SPI1
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(void)stm32_configgpio(GPIO_CS_MEMS);
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#endif
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#ifdef CONFIG_LCD_UG2864AMBAG01
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(void)stm32_configgpio(GPIO_OLED_CS); /* OLED chip select */
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(void)stm32_configgpio(GPIO_OLED_A0); /* OLED Command/Data */
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#endif
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}
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/****************************************************************************
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* Name: stm32_spi1/2/3select and stm32_spi1/2/3status
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*
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* Description:
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* The external functions, stm32_spi1/2/3select and stm32_spi1/2/3status must be
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* provided by board-specific logic. They are implementations of the select
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* and status methods of the SPI interface defined by struct spi_ops_s (see
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* include/nuttx/spi.h). All other methods (including up_spiinitialize())
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* are provided by common STM32 logic. To use this common SPI logic on your
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* board:
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*
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* 1. Provide logic in stm32_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide stm32_spi1/2/3select() and stm32_spi1/2/3status() functions in your
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* board-specific logic. These functions will perform chip selection and
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* status operations using GPIOs in the way your board is configured.
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* 3. Add a calls to up_spiinitialize() in your low level application
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* initialization logic
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* 4. The handle returned by up_spiinitialize() may then be used to bind the
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* 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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#ifdef CONFIG_STM32_SPI1
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void stm32_spi1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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#ifdef CONFIG_LCD_UG2864AMBAG01
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if (devid == SPIDEV_DISPLAY)
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{
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stm32_gpiowrite(GPIO_OLED_CS, !selected);
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}
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else
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#endif
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{
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stm32_gpiowrite(GPIO_CS_MEMS, !selected);
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}
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}
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uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e 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_STM32_SPI2
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void stm32_spi2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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}
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uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e 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_STM32_SPI3
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void stm32_spi3select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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}
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uint8_t stm32_spi3status(FAR struct spi_dev_s *dev, enum spi_dev_e 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: stm32_spi1cmddata
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*
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* Description:
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* Set or clear the SD1329 D/Cn bit to select data (true) or command
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* (false). This function must be provided by platform-specific logic.
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* This is an implementation of the cmddata method of the SPI
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* interface defined by struct spi_ops_s (see include/nuttx/spi.h).
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*
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* Input Parameters:
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*
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* spi - SPI device that controls the bus the device that requires the CMD/
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* DATA selection.
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* devid - If there are multiple devices on the bus, this selects which one
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* to select cmd or data. NOTE: This design restricts, for example,
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* one one SPI display per SPI bus.
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* cmd - true: select command; false: select data
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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_SPI_CMDDATA
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#ifdef CONFIG_STM32_SPI1
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int stm32_spi1cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd)
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{
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#ifdef CONFIG_LCD_UG2864AMBAG01
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if (devid == SPIDEV_DISPLAY)
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{
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/* "This is the Data/Command control pad which determines whether the
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* data bits are data or a command.
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*
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* A0 = <20>H<EFBFBD>: the inputs at D0 to D7 are treated as display data.
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* A0 = <20>L<EFBFBD>: the inputs at D0 to D7 are transferred to the command
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* registers."
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*/
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(void)stm32_gpiowrite(GPIO_OLED_A0, !cmd);
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return OK;
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}
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#endif
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_STM32_SPI2
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int stm32_spi2cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd)
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{
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_STM32_SPI3
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int stm32_spi3cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd)
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{
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return -ENODEV;
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}
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#endif
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#endif /* CONFIG_SPI_CMDDATA */
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#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 */
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