/************************************************************************************ * configs/vsn/src/spi.c * arch/arm/src/board/spi.c * * Copyright (C) 2009 Gregory Nutt. All rights reserved. * Copyright (C) 2011 Uros Platise. All rights reserved. * * Authors: Gregory Nutt * Uros Platise * * 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. * ************************************************************************************/ /** \file * \author Gregory Nutt, Uros Platise * \brief SPI Slave Selects */ #include #include #if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2) || defined(CONFIG_STM32_SPI3) #include #include #include #include #include "up_arch.h" #include "chip.h" #include "stm32_gpio.h" #include "stm32.h" #include "stm32_waste.h" #include "vsn.h" /************************************************************************************ * 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 /************************************************************************************ * Public Functions ************************************************************************************/ /** Called to configure SPI chip select GPIO pins for the VSN board. */ void weak_function stm32_spiinitialize(void) { /* NOTE: Clocking for SPI1 and/or SPI2 and SPI3 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 stm32_configgpio(GPIO_CC1101_CS); #endif #ifdef CONFIG_STM32_SPI3 stm32_configgpio(GPIO_FRAM_CS); #endif } /** Selects: stm32_spi1/2/3select and stm32_spi1/2/3status * * 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/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) { spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); } uint8_t 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, bool selected) { spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); if (devid == SPIDEV_WIRELESS) { stm32_gpiowrite(GPIO_CC1101_CS, !selected); /* Wait for MISO to go low, indicates that Quart has stabilized */ if (selected) { while (stm32_gpioread(GPIO_SPI2_MISO) ) up_waste(); } } } uint8_t 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, bool selected) { spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); if (devid == SPIDEV_FLASH) { /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_FRAM_CS, !selected); } } uint8_t 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 */