244 lines
7.4 KiB
C
244 lines
7.4 KiB
C
/****************************************************************************
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* boards/mips/pic32mx/pic32mx7mmb/src/pic32_spi.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 "mips_internal.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
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* Mikroelektronka PIC32MX7 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.
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* They are implementations of the select, status, and cmddata methods of
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* the SPI interface defined by struct spi_ops_s
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* (see include/nuttx/spi/spi.h).
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* All other methods including pic32mx_spibus_initialize()) are provided
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* by common PIC32MX logic.
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* To use 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
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* select 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
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* selection and status operations using GPIOs in the way your board is
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* 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
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* the way your board is configured.
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* 3. Add a call to pic32mx_spibus_initialize() in your low level
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* application initialization logic
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* 4. The handle returned by pic32mx_spibus_initialize() may then be used
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* to bind the 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(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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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(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(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(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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#warning "Missing logic"
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}
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uint8_t pic31mx_spi2status(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(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(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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#warning "Missing logic"
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}
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uint8_t pic32mx_spi3status(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(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(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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#warning "Missing logic"
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}
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uint8_t pic32mx_spi4status(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(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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