/************************************************************************************ * configs/zkit-arm-1769/src/up_ssp.c * arch/arm/src/board/up_ssp.c * * Copyright (C) 2013 Zilogic Systems. All rights reserved. * Author: BabuSubashChandar * * Based on configs/lpcxpresso-lpc1768/src/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_ssp.h" #include "lpc17_gpio.h" #include "zkitarm_internal.h" #if defined(CONFIG_LPC17_SSP0) || defined(CONFIG_LPC17_SSP1) /************************************************************************************ * Definitions ************************************************************************************/ /* CONFIG_DEBUG_SPI enables debug output from this file (needs CONFIG_DEBUG too) */ #ifdef CONFIG_DEBUG_SPI # define sspdbg lldbg # ifdef CONFIG_DEBUG_VERBOSE # define sspvdbg lldbg # else # define sspvdbg(x...) # endif #else # define sspdbg(x...) # define sspvdbg(x...) #endif /* Dump GPIO registers */ #if defined(CONFIG_DEBUG_SPI) && defined(CONFIG_DEBUG_VERBOSE) # define ssp_dumpgpio(m) lpc17_dumpgpio(SDCCS_GPIO, m) #else # define ssp_dumpgpio(m) #endif /************************************************************************************ * Private Functions ************************************************************************************/ /************************************************************************************ * Public Functions ************************************************************************************/ /************************************************************************************ * Name: zkit_sspinitialize * * Description: * Called to configure SPI chip select GPIO pins for the ZKIT-ARM-1769 Kit. * ************************************************************************************/ void weak_function zkit_sspinitialize(void) { /* Configure the SPI-based LCD CS GPIO */ ssp_dumpgpio("zkit_sspinitialize() Entry)"); /* Configure chip select for the LCD. */ #ifdef CONFIG_LPC17_SSP0 #ifdef CONFIG_NX_LCDDRIVER (void)lpc17_configgpio(ZKITARM_OLED_CS); #endif #endif /* CONFIG_LPC17_SSP0 */ ssp_dumpgpio("zkit_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 lpc17_sspinitialize()) * 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 lpc17_sspinitialize() in your low level application * initialization logic * 4. The handle returned by lpc17_sspinitialize() 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_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"); #warning "Assert CS here (false)" ssp_dumpgpio("lpc17_spi1select() Exit"); } uint8_t lpc17_ssp1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { sspdbg("Returning SPI_STATUS_PRESENT\n"); return SPI_STATUS_PRESENT; } /****************************************************************************** * Name: lpc17_ssp1cmddata * * Description: Dummy Function * ******************************************************************************/ #ifdef CONFIG_SPI_CMDDATA int weak_function lpc17_ssp1cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { return OK; } #endif /* CONFIG_SPI_CMDDATA */ #endif /* CONFIG_LPC17_SSP1 */ #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"); #ifdef CONFIG_NX_LCDDRIVER if (devid == SPIDEV_DISPLAY) { /* Assert the CS pin to the OLED display */ (void)lpc17_gpiowrite(ZKITARM_OLED_CS, !selected); } #endif ssp_dumpgpio("lpc17_spi0select() Exit"); } uint8_t lpc17_ssp0status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { if (devid == SPIDEV_DISPLAY) { sspdbg("Returning SPI_STATUS_PRESENT\n"); return SPI_STATUS_PRESENT; } sspdbg("Returning zero\n"); return 0; } #endif /* CONFIG_LPC17_SSP0 */ #endif /* CONFIG_LPC17_SSP0 || CONFIG_LPC17_SSP1 */