/************************************************************************************ * configs/shenzhou/src/stm32_spi.c * * Copyright (C) 2009 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 "up_arch.h" #include "chip.h" #include "stm32.h" #include "shenzhou.h" #if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI3) /************************************************************************************ * Public Functions ************************************************************************************/ /************************************************************************************ * Name: stm32_spidev_initialize * * Description: * Called to configure SPI chip select GPIO pins for the Shenzhou board. * ************************************************************************************/ void weak_function stm32_spidev_initialize(void) { /* NOTE: Clocking for SPI1 and/or 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. */ /* SPI1 connects to the SD CARD and to the SPI FLASH */ #ifdef CONFIG_STM32_SPI1 stm32_configgpio(GPIO_SD_CS); /* SD card chip select */ stm32_configgpio(GPIO_SD_CD); /* SD card detect */ stm32_configgpio(GPIO_FLASH_CS); /* FLASH chip select */ #endif /* SPI3 connects to TFT LCD module and the RF24L01 2.4G wireless module */ #ifdef CONFIG_STM32_SPI3 stm32_configgpio(GPIO_TP_CS); /* Touchscreen chip select */ stm32_configgpio(GPIO_LCDDF_CS); /* Data flash chip select (on the LCD module) */ stm32_configgpio(GPIO_LCDSD_CS); /* SD chip select (on the LCD module) */ stm32_configgpio(GPIO_WIRELESS_CS); /* Wireless chip select */ #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, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); /* SPI1 connects to the SD CARD and to the SPI FLASH */ if (devid == SPIDEV_MMCSD(0)) { /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_SD_CS, !selected); } else if (devid == SPIDEV_FLASH(0)) { /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_FLASH_CS, !selected); } } uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, uint32_t devid) { /* The card detect pin is pulled up so that we detect the presence of a card * by see a low value on the input pin. */ if (stm32_gpioread(GPIO_SD_CD)) { return 0; } return SPI_STATUS_PRESENT; } #endif #ifdef CONFIG_STM32_SPI3 void stm32_spi3select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); /* SPI3 connects to TFT LCD (for touchscreen and SD) and the RF24L01 2.4G * wireless module. */ if (devid == SPIDEV_TOUCHSCREEN(0)) { /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_TP_CS, !selected); } else if (devid == SPIDEV_MMCSD(0)) { /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_LCDDF_CS, !selected); } else if (devid == SPIDEV_FLASH(0)) { /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_LCDSD_CS, !selected); } else if (devid == SPIDEV_WIRELESS(0)) { /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_WIRELESS_CS, !selected); } } uint8_t stm32_spi3status(FAR struct spi_dev_s *dev, uint32_t devid) { return 0; } #endif #endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI3 */