/************************************************************************************ * configs/mirtoo/src/up_spi2.c * arch/arm/src/board/up_spi2.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 "pic32mx-pps.h" #include "mirtoo-internal.h" #ifdef CONFIG_PIC32MX_SPI2 /************************************************************************************ * Definitions ************************************************************************************/ /* The Mirtoo module as two on-board SPI devices: * * SST25VF032B - 32-Mbit SPI Serial FLASH * * PGA117 - Zero drift programmable gain amplifier with MUX. The PGA117 offers 10 * analog inputs, a four-pin SPI interface with daisy-chain capability, and hardware * and software shutdown in a TSSOP-20 package. Only 8 of the analog inputs (PORT0-7) * are used on the Mirtoo module. * * Chip selects: * * ------ -------- ------------------------- -------------------------------- * PIN SIGNAL BOARD CONNECTION NOTES * ------ -------- ------------------------- -------------------------------- * RPA1 SI PGA117 and SST25VF032B SPI2 data OUT (SDO2) * RPA2 SO PGA117 and SST25VF032B R1, SPI2 data IN (SDI2) * RPA3 SO PGA117 and SST25VF032B R0, SPI2 data IN (SDI2) * SCK2 SCK PGA117 and SST25VF032B SPI2 clock * * RB7 ~CSAI PGA117 PGA117 chip select (active low) * RB13 ~CSM SST25VF032B SST25VF032B chip select (active low) */ #define GPIO_SI (GPIO_OUTPUT|GPIO_PORTA|GPIO_PIN1) #ifdef CONFIG_MIRTOO_RELEASE == 1 # define GPIO_SO (GPIO_INPUT|GPIO_PORTA|GPIO_PIN2) #else # define GPIO_SO (GPIO_INPUT|GPIO_PORTA|GPIO_PIN3) #endif #define GPIO_SCK (GPIO_OUTPUT|GPIO_PORTB|GPIO_PIN15) #define GPIO_PGA117_CS (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTB|GPIO_PIN7) #define GPIO_SST25VF032B_CS (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTB|GPIO_PIN13) /* 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_spi2initialize * * Description: * Called to configure SPI2 chip select GPIO pins for the Mirtoo module. * ************************************************************************************/ void weak_function pic32mx_spi2initialize(void) { /* Make sure that TRIS pins are set correctly. Configure the SPI pins as digital * inputs and outputs first. */ pic32mx_configgpio(GPIO_SI); pic32mx_configgpio(GPIO_SO); pic32mx_configgpio(GPIO_SCK); /* Configure SPI2 data in and data out to use RPA2 and 1, respectively */ putreg32(PPS_INSEL_RPA2, PIC32MX_PPS_SDI2R); putreg32(PPS_OUTSEL_SDO2, PIC32MX_PPS_RPA1R); /* Configure the SPI chip select GPIOs */ pic32mx_configgpio(GPIO_PGA117_CS); pic32mx_configgpio(GPIO_SST25VF032B_CS); } /************************************************************************************ * Name: pic32mx_spi2select, pic32mx_spi2status, and pic32mx_spi2cmddata * * 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 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; void pic32mx_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"); if (devid == SPIDEV_FLASH) { pic32mx_gpiowrite(GPIO_SST25VF032B_CS, !selected); } else if (devid == SPIDEV_MUX) { pic32mx_gpiowrite(GPIO_PGA117_CS, !selected); } } uint8_t pic32mx_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) { return 0; } #ifdef CONFIG_SPI_CMDDATA int pic32mx_spi2cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) { return 0; } #endif #endif /* CONFIG_PIC32MX_SPI2 */