nuttx/configs/stm32_tiny/src/up_spi.c

187 lines
6.3 KiB
C
Raw Normal View History

/************************************************************************************
* configs/stm32_tiny/src/up_spi.c
*
* Copyright (C) 2009, 2011-2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
* Laurent Latil <laurent@latil.nom.fr>
*
* 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 <stdint.h>
#include <stdbool.h>
#include <debug.h>
#include <nuttx/spi.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "chip.h"
#include "stm32.h"
#include "stm32_tiny-internal.h"
#if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2)
/************************************************************************************
* Definitions
************************************************************************************/
/* Enables debug output from this file (needs CONFIG_DEBUG too) */
#ifndef CONFIG_DEBUG
# undef CONFIG_DEBUG_VERBOSE
# undef CONFIG_DEBUG_SPI
#endif
#ifdef CONFIG_DEBUG_SPI
# define spidbg lldbg
# ifdef CONFIG_DEBUG_VERBOSE
# define spivdbg lldbg
# else
# define spivdbg(x...)
# endif
#else
# define spidbg(x...)
# define spivdbg(x...)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: stm32_spiinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the HY-MiniSTM32 board.
*
************************************************************************************/
void 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_SPI2
# ifdef CONFIG_WL_NRF24L01
/* Configure the SPI-based NRF24L01 chip select GPIO */
spivdbg("Configure GPIO for SPI2/CS\n");
stm32_configgpio(GPIO_NRF24L01_CS);
# endif
#endif
}
/****************************************************************************
* Name: stm32_spi1/2select and stm32_spi1/2status
*
* 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.
* 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, bool selected)
{
}
uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
return 0;
}
#endif
#ifdef CONFIG_STM32_SPI2
void stm32_spi2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
switch(devid)
{
#ifdef CONFIG_WL_NRF24L01
case SPIDEV_WIRELESS:
spivdbg("nRF24L01 device %s\n", selected ? "asserted" : "de-asserted");
/* Set the GPIO low to select and high to de-select */
stm32_gpiowrite(GPIO_NRF24L01_CS, !selected);
break;
#endif
default:
break;
}
}
uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
uint8_t status = 0;
switch(devid)
{
#ifdef CONFIG_WL_NRF24L01
case SPIDEV_WIRELESS:
status |= SPI_STATUS_PRESENT;
break;
#endif
default:
break;
}
return status;
}
#endif
#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 */