/************************************************************************************ * configs/ea3131/src/up_spi.c * arch/arm/src/board/up_spi.c * * Copyright (C) 2009-2010 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 "lpc313x_internal.h" #include "ea3131_internal.h" #ifdef CONFIG_LPC313X_SPI #if 0 /* At present, EA3131 specific logic is hard-coded in the file lpc313x_spi.c * in arch/arm/src/lpc313x */ /************************************************************************************ * Definitions ************************************************************************************/ /* Enables debug output from this file (needs CONFIG_DEBUG too) */ #undef SPI_DEBUG /* Define to enable debug */ #undef SPI_VERBOSE /* Define to enable verbose debug */ #ifdef SPI_DEBUG # define spidbg lldbg # ifdef SPI_VERBOSE # define spivdbg lldbg # else # define spivdbg(x...) # endif #else # undef SPI_VERBOSE # define spidbg(x...) # define spivdbg(x...) #endif /************************************************************************************ * Private Functions ************************************************************************************/ /************************************************************************************ * Public Functions ************************************************************************************/ /************************************************************************************ * Name: lpc313x_spiinitialize * * Description: * Called to configure SPI chip select GPIO pins for the EA3131 board. * ************************************************************************************/ void weak_function lpc313x_spiinitialize(void) { /* NOTE: Clocking for SPI has already been provided. * Configurations of SPI pins is performed in lpc313x_spi.c. * Here, we only initialize chip select pins unique to the board * architecture. */ gpio_outputhigh(LPC313X_IOCONFIG_SPI, SPINOR_CS); } /**************************************************************************** * Name: lpc313x_spiselect and lpc313x_spistatus * * Description: * The external functions, lpc313x_spiselect and lpc313x_spistatus 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 LPC313X logic. To use this common SPI logic on your * board: * * 1. Provide logic in lpc313x_boardinitialize() to configure SPI chip select * pins. * 2. Provide lpc313x_spiselect() and lpc313x_spistatus() 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). * ****************************************************************************/ void lpc313x_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected) { spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); if (devid == SPIDEV_FLASH) { if (selected) { gpio_outputlow(LPC313X_IOCONFIG_SPI, SPINOR_CS); } else { gpio_outputhigh(LPC313X_IOCONFIG_SPI, SPINOR_CS); } } } uint8_t lpc313x_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { return SPI_STATUS_PRESENT; } #endif /* 0 */ #endif /* CONFIG_LPC313X_SPI */