/**************************************************************************** * boards/mips/pic32mx/pic32mx7mmb/src/pic32_spi.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "mips_internal.h" #include "chip.h" #include "pic32mx.h" #include "pic32mx7mmb.h" #if defined(CONFIG_PIC32MX_SPI1) || defined(CONFIG_PIC32MX_SPI2) || \ defined(CONFIG_PIC32MX_SPI3) || defined(CONFIG_PIC32MX_SPI4) /**************************************************************************** * Pre-processor 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) /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: pic32mx_spidev_initialize * * Description: * Called to configure SPI chip select GPIO pins for the * Mikroelektronka PIC32MX7 MMB board. * ****************************************************************************/ void weak_function pic32mx_spidev_initialize(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/spi.h). * All other methods including pic32mx_spibus_initialize()) 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 pic32mx_spibus_initialize() in your low level * application initialization logic * 4. The handle returned by pic32mx_spibus_initialize() 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; #ifdef CONFIG_PIC32MX_SPI1 void pic32mx_spi1select(struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); if (devid == SPIDEV_MMCSD(0)) { pic32mx_gpiowrite(GPIO_SD_CS, !selected); } } uint8_t pic32mx_spi1status(struct spi_dev_s *dev, uint32_t devid) { uint8_t ret = 0; /* Card detect active low. */ if (devid == SPIDEV_MMCSD(0)) { if (!pic32mx_gpioread(GPIO_SD_CD)) { ret = SPI_STATUS_PRESENT; /* A high value indicates that the card is write protected. */ if (pic32mx_gpioread(GPIO_SD_WP)) { ret |= SPI_STATUS_WRPROTECTED; } } } spiinfo("Returning %02x\n", ret); return ret; } #ifdef CONFIG_SPI_CMDDATA int pic32mx_spi1cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #ifdef CONFIG_PIC32MX_SPI2 void pic31mx_spi2select(struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); #warning "Missing logic" } uint8_t pic31mx_spi2status(struct spi_dev_s *dev, uint32_t devid) { spiinfo("Returning nothing\n"); #warning "Missing logic" return 0; } #ifdef CONFIG_SPI_CMDDATA int pic31mx_spi2cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #ifdef CONFIG_PIC32MX_SPI3 void pic32mx_spi3select(struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); #warning "Missing logic" } uint8_t pic32mx_spi3status(struct spi_dev_s *dev, uint32_t devid) { spiinfo("Returning nothing\n"); #warning "Missing logic" return 0; } #ifdef CONFIG_SPI_CMDDATA int pic32mx_spi3cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #ifdef CONFIG_PIC32MX_SPI4 void pic32mx_spi4select(struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); #warning "Missing logic" } uint8_t pic32mx_spi4status(struct spi_dev_s *dev, uint32_t devid) { spiinfo("Returning nothing\n"); #warning "Missing logic" return 0; } #ifdef CONFIG_SPI_CMDDATA int pic32mx_spi4cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd) { #warning "Missing logic" return 0; } #endif #endif #endif /* CONFIG_PIC32MX_SPI1..4 */