/************************************************************************************
* configs/stm3210e_eval/src/up_spi.c
* arch/arm/src/board/up_spi.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <debug.h>
#include <nuttx/spi.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "chip.h"
#include "stm32_internal.h"
#include "stm3210e-internal.h"
#if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2)
/************************************************************************************
* Definitions
************************************************************************************/
/* Enables debug output from this file (needs CONFIG_DEBUG too) */
#undef SPI_DEBUG /* Define to enable debug */
#undef SPI_VERBOSE /* Define to enable verbose debug */
#ifdef SPI_DEBUG
# define spidbg lldbg
# ifdef SPI_VERBOSE
# define spivdbg lldbg
# else
# define spivdbg(x...)
# endif
#else
# undef SPI_VERBOSE
# define spidbg(x...)
# define spivdbg(x...)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
static void stm32_chipselect(FAR struct spi_dev_s *dev, uint32 pinset, boolean pinval, boolean selected)
{
spidbg("devid: %d CS: %s pinset: %08x pinval: %s\n",
(int)devid, selected ? "assert" : "de-assert", pinset, pinval ? "HIGH" : "LOW");
/* If we are selecting the chip, then we must call stm32_spitake to assure that we
* have mutually exclusive access to the SPI bus while the chip is selected.
*/
if (selected)
{
stm32_spitake(dev);
}
/* Then set the CHIP select. Usually the chip select is LOW to select and HIGH, but
* that can vary from part to part.
*/
stm32_gpiowrite(pinset, pinval);
/* If we just de-selected the chip, then we must call stm32_spigive to to relinquish
* our exclusive access to the SPI bus. Now, any waiting threads can have the SPI.
*/
if (!selected)
{
stm32_spigive(dev);
}
}
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: stm32_spiinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the STM3210E-EVAL board.
*
************************************************************************************/
void weak_function stm32_spiinitialize(void)
{
/* NOTE: Clocking for SPI1 and/or SPI2 was already provided in stm32_rcc.c.
* Configurations of SPI pins is performed in stm32_spi.c.
* Here, we only initialize chip select pins unique to the board
* architecture.
*/
#ifdef CONFIG_STM32_SPI1
/* Configure the SPI-based microSD and FLASH CS GPIO */
#warning "MicoSD is on SDIO port, not SPI"
stm32_configgpio(GPIO_MMCSD_CS);
stm32_configgpio(GPIO_FLASH_CS);
#endif
}
/****************************************************************************
* Name: stm32_spi1/2/3select and stm32_spi1/2/3status
*
* Description:
* The external functions, stm32_spi1/2/3select and stm32_spi1/2/3status must be
* provided by board-specific logic. They are implementations of the select
* and status methods of the SPI interface defined by struct spi_ops_s (see
* include/nuttx/spi.h). All other methods (including up_spiinitialize())
* are provided by common STM32 logic. To use this common SPI logic on your
* board:
*
* 1. Provide logic in stm32_boardinitialize() to configure SPI chip select
* pins.
* 2. Provide stm32_spi1/2/3select() and stm32_spi1/2/3status() functions in your
* board-specific logic. These functions will perform chip selection and
* status operations using GPIOs in the way your board is configured.
* The select() methods must call stm32_spitake() when the chip is selected
* and stm32_spigive() when the chip is deselected. This assures mutually
* exclusive access to the SPI for the duration while a chip is selected.
* 3. Add a calls to up_spiinitialize() in your low level application
* initialization logic
* 4. The handle returned by up_spiinitialize() 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_STM32_SPI1
void stm32_spi1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, boolean selected)
{
spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
if (devid == SPIDEV_MMCSD)
{
/* Set the GPIO low to select and high to de-select */
stm32_chipselect(dev, GPIO_MMCSD_CS,!selected, selected);
}
else if (devid == SPIDEV_FLASH)
{
/* Set the GPIO low to select and high to de-select */
stm32_chipselect(dev, GPIO_FLASH_CS,!selected, selected);
}
}
ubyte stm32_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
return SPI_STATUS_PRESENT;
}
#endif
#ifdef CONFIG_STM32_SPI2
void stm32_spi2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, boolean selected)
{
spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
}
ubyte stm32_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
return SPI_STATUS_PRESENT;
}
#endif
#ifdef CONFIG_STM32_SPI3
void stm32_spi3select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, boolean selected)
{
spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
}
ubyte stm32_spi3status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
return SPI_STATUS_PRESENT;
}
#endif
#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 */
