/************************************************************************************ * configs/nucleus2g/src/up_ssp.c * arch/arm/src/board/up_ssp.c * * Copyright (C) 2010 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 "lpc17_internal.h" #include "nucleus2g_internal.h" /* The LM3S6965 Eval Kit microSD CS is on SSI0 */ #if defined(CONFIG_LPC17_SSP0) || defined(CONFIG_LPC17_SSP1) /************************************************************************************ * Definitions ************************************************************************************/ /* Enables debug output from this file (needs CONFIG_DEBUG too) */ #undef SSP_DEBUG /* Define to enable debug */ #undef SSP_VERBOSE /* Define to enable verbose debug */ #ifdef SSP_DEBUG # define sspdbg lldbg # ifdef SSP_VERBOSE # define sspvdbg lldbg # else # define sspvdbg(x...) # endif #else # undef SSP_VERBOSE # define sspdbg(x...) # define sspvdbg(x...) #endif /* Dump GPIO registers */ #ifdef SSP_VERBOSE # define ssp_dumpgpio(m) lpc17_dumpgpio(SDCCS_GPIO, m) #else # define ssp_dumpgpio(m) #endif /************************************************************************************ * Private Functions ************************************************************************************/ /************************************************************************************ * Public Functions ************************************************************************************/ /************************************************************************************ * Name: lpc17_sspinitialize * * Description: * Called to configure SPI chip select GPIO pins for the LM3S6965 Eval Kit. * ************************************************************************************/ void weak_function lpc17_sspinitialize(void) { /* Configure the SPI-based microSD CS GPIO */ ssp_dumpgpio("lpc17_sspinitialize() Entry)"); /* SSP0 connects only to the MMC/SD slot on the Nucleus 1G board. * P0[15]/TXD1/SCK0/SCK MMC_CLK * P0[16]/RXD1/SSEL0/SSEL MMC_CD * P0[17]/CTS1/MISO0/MISO MMC_DATA0 * P0[18]/DCD1/MOSI0/MOSI MMC_MISO * * In SPI mode the MMC/SD DATA3/CD functions as the SPI chip select. */ #ifdef CONFIG_LPC17_SSP0 lpc17_configgpio(NUCLEUS2G_MMCSD_CS); #endif /* SSP1 goes off the Nucleus 2G board to the Babel CAN board along with 3 chip * select pins. However, it is currently not used on that board. */ #ifdef CONFIG_LPC17_SSP1 # warning "SSP1 chip selects not known" #endif ssp_dumpgpio("lpc17_sspinitialize() Exit"); } /************************************************************************************ * Name: lpc17_ssp0/ssp1select and lpc17_ssp0/ssp1status * * Description: * The external functions, lpc17_ssp0/ssp1select and lpc17_ssp0/ssp1status * 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 LPC17xx logic. To use this common SPI logic on your * board: * * 1. Provide logic in lpc17_boardinitialize() to configure SPI/SSP chip select * pins. * 2. Provide lpc17_ssp0/ssp1select() and lpc17_ssp0/ssp1status() 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_LPC17_SSP0 void lpc17_ssp0select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected) { sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); ssp_dumpgpio("lpc17_spiselect() Entry"); if (devid == SPIDEV_MMCSD) { /* Assert the CS pin to the card */ lpc17_gpiowrite(NUCLEUS2G_MMCSD_CS, !selected); } ssp_dumpgpio("lpc17_spiselect() Exit"); } uint8_t lpc17_ssp0status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { sspdbg("Returning SPI_STATUS_PRESENT\n"); return SPI_STATUS_PRESENT; } #endif #ifdef CONFIG_LPC17_SSP1 # warning "SSP1 chip selects not known" #endif #endif /* CONFIG_LPC17_SSP0 || CONFIG_LPC17_SSP1 */