/************************************************************************************ * configs/stm32f3discovery/src/stm32_spi.c * * Copyright (C) 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include "up_arch.h" #include "chip.h" #include "stm32.h" #include "stm32f3discovery.h" #if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2) || defined(CONFIG_STM32_SPI3) /************************************************************************************ * Public Functions ************************************************************************************/ /************************************************************************************ * Name: stm32_spidev_initialize * * Description: * Called to configure SPI chip select GPIO pins for the stm32f3discovery board. * ************************************************************************************/ void weak_function stm32_spidev_initialize(void) { #ifdef CONFIG_STM32_SPI1 (void)stm32_configgpio(GPIO_MEMS_CS); /* MEMS chip select */ (void)stm32_configgpio(GPIO_MEMS_INT1); /* MEMS interrupts */ (void)stm32_configgpio(GPIO_MEMS_INT2); #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/spi.h). All other methods (including stm32_spibus_initialize()) * 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 stm32_spibus_initialize() in your low level application * initialization logic * 4. The handle returned by stm32_spibus_initialize() 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) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); stm32_gpiowrite(GPIO_MEMS_CS, !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) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); } uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { return 0; } #endif #ifdef CONFIG_STM32_SPI3 void stm32_spi3select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); } uint8_t stm32_spi3status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { return 0; } #endif /**************************************************************************** * Name: stm32_spi1cmddata * * Description: * Set or clear the SH1101A A0 or SD1306 D/C n bit to select data (true) * or command (false). This function must be provided by platform-specific * logic. This is an implementation of the cmddata method of the SPI * interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h). * * Input Parameters: * * spi - SPI device that controls the bus the device that requires the CMD/ * DATA selection. * devid - If there are multiple devices on the bus, this selects which one * to select cmd or data. NOTE: This design restricts, for example, * one one SPI display per SPI bus. * cmd - true: select command; false: select data * * Returned Value: * None * ****************************************************************************/ #ifdef CONFIG_SPI_CMDDATA #ifdef CONFIG_STM32_SPI1 int stm32_spi1cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { return -ENODEV; } #endif #ifdef CONFIG_STM32_SPI2 int stm32_spi2cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { return -ENODEV; } #endif #ifdef CONFIG_STM32_SPI3 int stm32_spi3cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { return -ENODEV; } #endif #endif /* CONFIG_SPI_CMDDATA */ #endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 */