diff options
Diffstat (limited to 'nuttx/configs/zkit-arm-1769/src/up_ssp.c')
-rw-r--r-- | nuttx/configs/zkit-arm-1769/src/up_ssp.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/nuttx/configs/zkit-arm-1769/src/up_ssp.c b/nuttx/configs/zkit-arm-1769/src/up_ssp.c new file mode 100644 index 000000000..543669035 --- /dev/null +++ b/nuttx/configs/zkit-arm-1769/src/up_ssp.c @@ -0,0 +1,214 @@ +/************************************************************************************ + * 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 <code@zilogic.com> + * + * Based on configs/lpcxpresso-lpc1768/src/up_ssp.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <nuttx/config.h> + +#include <stdint.h> +#include <stdbool.h> +#include <debug.h> + +#include <nuttx/spi.h> +#include <arch/board/board.h> + +#include "up_arch.h" +#include "chip.h" +#include "lpc17_internal.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: 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_SSP0 + (void)lpc17_configgpio(ZKITARM_SD_CS); + (void)lpc17_configgpio(ZKITARM_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(ZKITARM_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_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; +} +#endif + +#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"); + + if (devid == SPIDEV_MMCSD) + { + /* Assert/de-assert the CS pin to the card */ + + (void)lpc17_gpiowrite(ZKITARM_SD_CS, !selected); + } +#ifdef CONFIG_NX_LCDDRIVER + else 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_MMCSD) + { + /* Read the state of the card-detect bit */ + + if (lpc17_gpioread(ZKITARM_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 */ |