/************************************************************************************ * configs/lpcxpresso-lpc1768/src/up_ssp.c * arch/arm/src/board/up_ssp.c * * Copyright (C) 2011 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 "lpcxpresso_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)"); /* Configure card detect and chip select for the SD slot. NOTE: Jumper J55 must * be set correctly for the SD slot chip select. */ #ifdef CONFIG_LPC17_SSP1 (void)lpc17_configgpio(LPCXPRESSO_SD_CS); (void)lpc17_configgpio(LPCXPRESSO_SD_CD); /* Configure chip select for the OLED. For the SPI interface, insert jumpers in * J42, J43, J45 pin1-2 and J46 pin 1-2. */ #ifdef CONFIG_NX_LCDDRIVER (void)lpc17_configgpio(LPCXPRESSO_OLED_CS); #endif #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_spi0select() Entry"); #warning "Assert CS here (false)" ssp_dumpgpio("lpc17_spi0select() 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 void lpc17_ssp1select(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_spi1select() Entry"); if (devid == SPIDEV_MMCSD) { /* Assert/de-assert the CS pin to the card */ (void)lpc17_gpiowrite(LPCXPRESSO_SD_CS, !selected); } #ifdef CONFIG_NX_LCDDRIVER else if (devid == SPIDEV_DISPLAY) { /* Assert the CS pin to the OLED display */ (void)lpc17_gpiowrite(LPCXPRESSO_OLED_CS, !selected); } #endif ssp_dumpgpio("lpc17_spi1select() Exit"); } uint8_t lpc17_ssp1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { if (devid == SPIDEV_MMCSD) { /* Read the state of the card-detect bit */ if (lpc17_gpioread(LPCXPRESSO_SD_CD) == 0) { sspdbg("Returning SPI_STATUS_PRESENT\n"); return SPI_STATUS_PRESENT; } } sspdbg("Returning zero\n"); return 0; } #endif #endif /* CONFIG_LPC17_SSP0 || CONFIG_LPC17_SSP1 */