/************************************************************************************
* configs/mirtoo/src/up_spi2.c
* arch/arm/src/board/up_spi2.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <debug.h>
#include <nuttx/spi.h>
#include <arch/board/board.h>
#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.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 */
