246 lines
8.2 KiB
C
246 lines
8.2 KiB
C
/************************************************************************************
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* configs/pic32mx7mmb/src/pic32_spi.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <nuttx/spi/spi.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "chip.h"
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#include "pic32mx.h"
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#include "pic32mx7mmb.h"
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#if defined(CONFIG_PIC32MX_SPI1) || defined(CONFIG_PIC32MX_SPI2) || \
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defined(CONFIG_PIC32MX_SPI3) || defined(CONFIG_PIC32MX_SPI4)
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* SPI1 and SD Card
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*
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* ------ -------- ------------------------- --------------------------------
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* GPIO SIGNAL BOARD CONNECTION NOTES
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* ------ -------- ------------------------- --------------------------------
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* RC4 SPI1 SD card slot SPI1 data IN
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* RD0 SPO1 SD card slot SPI1 data OUT
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* RD10 SCK1 SD card slot SD card, SPI clock
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*
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* RA9 SD_CS# SD card slot SD card, SPI chip select (active low)
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* RG6 SD_WP SD card slot SD card, write protect
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* RG7 SD_CD# SD card slot SD card, card detect (not)
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*/
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#define GPIO_SD_CS (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTA|GPIO_PIN9)
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#define GPIO_SD_WP (GPIO_INPUT|GPIO_PORTG|GPIO_PIN6)
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#define GPIO_SD_CD (GPIO_INPUT|GPIO_INT|GPIO_PORTG|GPIO_PIN7)
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: pic32mx_spidev_initialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the Mikroelektronka PIC32MX7
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* MMB board.
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*
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************************************************************************************/
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void weak_function pic32mx_spidev_initialize(void)
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{
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/* Configure the SPI chip select, write protect, and card detect GPIOs */
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#ifdef CONFIG_PIC32MX_SPI1
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pic32mx_configgpio(GPIO_SD_CS);
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pic32mx_configgpio(GPIO_SD_WP);
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pic32mx_configgpio(GPIO_SD_CD);
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#endif
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}
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/************************************************************************************
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* Name: pic32mx_spiNselect, pic32mx_spiNstatus, and pic32mx_spiNcmddata
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*
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* Description:
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* These external functions must be provided by board-specific logic. They are
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* implementations of the select, status, and cmddata methods of the SPI interface
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* defined by struct spi_ops_s (see include/nuttx/spi/spi.h). All other methods
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* including pic32mx_spibus_initialize()) are provided by common PIC32MX logic. To use
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* this common SPI logic on your board:
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*
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* 1. Provide logic in pic32mx_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide pic32mx_spiNselect() and pic32mx_spiNstatus() functions
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* in your board-specific logic. These functions will perform chip selection
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* and status operations using GPIOs in the way your board is configured.
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* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
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* pic32mx_spiNcmddata() functions in your board-specific logic. These
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* functions will perform cmd/data selection operations using GPIOs in the way
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* your board is configured.
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* 3. Add a call to pic32mx_spibus_initialize() in your low level application
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* initialization logic
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* 4. The handle returned by pic32mx_spibus_initialize() may then be used to bind the
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* SPI driver to higher level logic (e.g., calling
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* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
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* the SPI MMC/SD driver).
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*
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************************************************************************************/
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struct spi_dev_s;
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#ifdef CONFIG_PIC32MX_SPI1
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void pic32mx_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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if (devid == SPIDEV_MMCSD(0))
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{
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pic32mx_gpiowrite(GPIO_SD_CS, !selected);
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}
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}
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uint8_t pic32mx_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
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{
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uint8_t ret = 0;
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/* Card detect active low. */
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if (devid == SPIDEV_MMCSD(0))
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{
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if (!pic32mx_gpioread(GPIO_SD_CD))
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{
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ret = SPI_STATUS_PRESENT;
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/* A high value indicates that the card is write protected. */
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if (pic32mx_gpioread(GPIO_SD_WP))
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{
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ret |= SPI_STATUS_WRPROTECTED;
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}
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}
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}
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spiinfo("Returning %02x\n", ret);
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return ret;
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}
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#ifdef CONFIG_SPI_CMDDATA
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int pic32mx_spi1cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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#warning "Missing logic"
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return 0;
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}
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#endif
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#endif
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#ifdef CONFIG_PIC32MX_SPI2
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void pic31mx_spi2select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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#warning "Missing logic"
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}
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uint8_t pic31mx_spi2status(FAR struct spi_dev_s *dev, uint32_t devid)
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{
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spiinfo("Returning nothing\n");
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#warning "Missing logic"
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return 0;
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}
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#ifdef CONFIG_SPI_CMDDATA
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int pic31mx_spi2cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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#warning "Missing logic"
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return 0;
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}
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#endif
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#endif
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#ifdef CONFIG_PIC32MX_SPI3
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void pic32mx_spi3select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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#warning "Missing logic"
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}
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uint8_t pic32mx_spi3status(FAR struct spi_dev_s *dev, uint32_t devid)
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{
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spiinfo("Returning nothing\n");
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#warning "Missing logic"
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return 0;
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}
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#ifdef CONFIG_SPI_CMDDATA
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int pic32mx_spi3cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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#warning "Missing logic"
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return 0;
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}
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#endif
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#endif
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#ifdef CONFIG_PIC32MX_SPI4
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void pic32mx_spi4select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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#warning "Missing logic"
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}
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uint8_t pic32mx_spi4status(FAR struct spi_dev_s *dev, uint32_t devid)
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{
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spiinfo("Returning nothing\n");
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#warning "Missing logic"
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return 0;
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}
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#ifdef CONFIG_SPI_CMDDATA
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int pic32mx_spi4cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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#warning "Missing logic"
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return 0;
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}
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#endif
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#endif
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#endif /* CONFIG_PIC32MX_SPI1..4 */
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