/************************************************************************************ * configs/pic32mx7mmb/src/up_spi.c * arch/arm/src/board/up_spi.c * * Copyright (C) 2012 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 "pic32mx-internal.h" #include "pic32mx7mmb_internal.h" #if defined(CONFIG_PIC32MX_SPI1) || defined(CONFIG_PIC32MX_SPI2) || \ defined(CONFIG_PIC32MX_SPI3) || defined(CONFIG_PIC32MX_SPI4) /************************************************************************************ * Definitions ************************************************************************************/ /* SPI1 and SD Card * * ------ -------- ------------------------- -------------------------------- * GPIO SIGNAL BOARD CONNECTION NOTES * ------ -------- ------------------------- -------------------------------- * RC4 SPI1 SD card slot SPI1 data IN * RD0 SPO1 SD card slot SPI1 data OUT * RD10 SCK1 SD card slot SD card, SPI clock * * RA9 SD_CS# SD card slot SD card, SPI chip select (active low) * RG6 SD_WP SD card slot SD card, write protect * RG7 SD_CD# SD card slot SD card, card detect (not) */ #define GPIO_SD_CS (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTA|GPIO_PIN9) #define GPIO_SD_WP (GPIO_INPUT|GPIO_PORTG|GPIO_PIN6) #define GPIO_SD_CD (GPIO_INPUT|GPIO_INT|GPIO_PORTG|GPIO_PIN7) /* The following enable debug output from this file (needs CONFIG_DEBUG too). * * CONFIG_DEBUG_SPI - Define to enable basic SPI debug */ #ifdef CONFIG_DEBUG_SPI # define spidbg lldbg # define spivdbg llvdbg #else # define spidbg(x...) # define spivdbg(x...) #endif /************************************************************************************ * Private Functions ************************************************************************************/ /************************************************************************************ * Public Functions ************************************************************************************/ /************************************************************************************ * Name: pic32mx_spiinitialize * * Description: * Called to configure SPI chip select GPIO pins for the Mikroelektronka PIC32MX7 * MMB board. * ************************************************************************************/ void weak_function pic32mx_spiinitialize(void) { /* Configure the SPI chip select, write protect, and card detect GPIOs */ #ifdef CONFIG_PIC32MX_SPI1 pic32mx_configgpio(GPIO_SD_CS); pic32mx_configgpio(GPIO_SD_WP); pic32mx_configgpio(GPIO_SD_CD); #endif } /************************************************************************************ * Name: pic32mx_spiNselect, pic32mx_spiNstatus, and pic32mx_spiNcmddata * * Description: * These external functions must be provided by board-specific logic. They are * implementations of the select, status, and cmddata 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 PIC32MX logic. To use * this common SPI logic on your board: * * 1. Provide logic in pic32mx_boardinitialize() to configure SPI chip select * pins. * 2. Provide pic32mx_spiNselect() and pic32mx_spiNstatus() functions * in your board-specific logic. These functions will perform chip selection * and status operations using GPIOs in the way your board is configured. * 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide * pic32mx_spiNcmddata() functions in your board-specific logic. These * functions will perform cmd/data selection operations using GPIOs in the way * your board is configured. * 3. Add a call 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). * ************************************************************************************/ struct spi_dev_s; enum spi_dev_e; #ifdef CONFIG_PIC32MX_SPI1 void pic32mx_spi1select(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_MMCSD) { pic32mx_gpiowrite(GPIO_SD_CS, !selected); } } uint8_t pic32mx_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { uint8_t ret = 0; /* Card detect active low. */ if (devid == SPIDEV_MMCSD) { if (!pic32mx_gpioread(GPIO_SD_CD)) { ret = SPI_STATUS_PRESENT; /* A high value indicates the the card is write protected. */ if (pic32mx_gpioread(GPIO_SD_WP)) { ret |= SPI_STATUS_WRPROTECTED; } } } spidbg("Returning %02x\n", ret); return ret; } #ifdef CONFIG_SPI_CMDDATA int pic32mx_spi1cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #ifdef CONFIG_PIC31MX_SPI2 void pic31mx_spi2select(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"); #warning "Missing logic" } uint8_t pic31mx_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { spidbg("Returning nothing\n"); #warning "Missing logic" return 0; } #ifdef CONFIG_SPI_CMDDATA int pic31mx_spi2cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #ifdef CONFIG_PIC31MX_SPI3 void pic32mx_spi3select(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"); #warning "Missing logic" } uint8_t pic32mx_spi3status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { spidbg("Returning nothing\n"); #warning "Missing logic" return 0; } #ifdef CONFIG_SPI_CMDDATA int pic32mx_spi3cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #ifdef CONFIG_PIC32MX_SPI4 void pic32mx_spi4select(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"); #warning "Missing logic" } uint8_t pic32mx_spi4status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { spidbg("Returning nothing\n"); #warning "Missing logic" return 0; } #ifdef CONFIG_SPI_CMDDATA int pic32mx_spi4cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #endif /* CONFIG_PIC32MX_SPI1..4 */